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Mitsubishi Diamante



  • Has anyone had a problem with thier FM stereo reception when they turn on the rear defogger? Basically it is an intermittent buzzing/cracklin sound everytime I hit the defog button, does not effect AM or CD's.

    Also, between 30-40 mph and 50 -60 mph, there is a strange sort of buzzy vibration in the vehicle and at the same time you hear kind of a wo-wo-wo-wo, sound eminating from the wheel area. Has anyone else experienced this? The buzzy vibration sort of reminds me of wore wheel bearings but no-where as prominent in previous vehicle (1985 camaro). Also, the other sounds I think may be the tires (Goodyear - cant stand). I noticed a similar sound on my previous vehicle with GY's (2000 Pontiac Grand Prix).

    Any thoughts would be greatly appreciated.
  • Mr. Vivona -- Thanks a lot for your reply. I checked the ABS sensors just like you suggested, but could not find anything wrong. I then took it to Pep Boys, who after plugging it on to their ABS computer were unable to get an error code and referred me to the dealer. The dealer checked it and told me that the ABS control module has failed and would cost about 3 grand to fix. I asked them to leave it alone and just had the brake pads replaced. The car has a brand new transmission and new brakes and I am just going to drive it for a year or so and then get rid of it.
  • vivonavivona Posts: 410
    amlan -- If your dealer is SURE it is the ABS control module, you may want to replace it. ABS can prevent an accident and has saved me several times. What year is your Diamante? The ABS module for my 1997 is $468, a lot less than the $3,000 your dealer is quoting.

    Mr. Vivona
  • Mr. Vivona -- My Diamante is a 1993 ES with 127,000 miles on it. Is there an aftermarket ABS module that I can find and can I replace the module myself?
  • vivonavivona Posts: 410
    amlan - Yes, there are aftermarket and rebuilt brake modules available. I checked and indeed the new module cost for a first generation Diamante is much more expensive than for a second generation Diamante. Aftermarket ones for the first generation Diamante (like yours) cost about $500. See and enter your year, make, model, engine and use Brake/Wheel Hub as the category. Also try and see which has the lowest delivered price. Don't forget your local AutoZone, Pep Boys, etc. They may stock an aftermarket module.

    Before replacing the module I would want to be very sure it is bad. Unfortunately all a dealer does is connect a code reader and if it says the module is bad that isn't always conclusive. Since the problem started right after you had some work done, I would look for a broken or loose wire, either to a wheel sensor or the ABS system. If you can buy a module locally with return privileges, try it and return it if it doesn't fix the problem.

    Mr. Vivona
  • I have a 1997 Diamante. Sometimes there is a shock (or bump) when I stop the car. The shock occurs just before the car comes to a complete stop. On occasion, the shock can be quite harsh. The shock does not occur every time I stop. Does anyone else have this problem or does anyone know what the problem is?
  • vivonavivona Posts: 410
    ineed2cars -- A bump just before coming to a stop is usually caused by the transmission shifting into low. To prevent the bump, the accelerator has a switch that tells the transmission computer that you have taken your foot off the accelerator and the car is coasting to a stop. If the switch activates (indicating that your foot is off the gas pedal) the transmission shifts into 2nd upon stop and doesn't shift into low until you take off again. This prevents the bump.

    If you have your foot even slightly on the gas as you come to a stop, the switch will not activate and the transmission will shift all the way to low and you will feel the bump. You can create this scenario by braking to a stop with you left foot and keeping your right foot slightly on the gas.

    If the transmission bumps with your foot off the gas, I would look for a defective accelerator switch. You could also have a sticking throttle cable that is preventing the accelerator from going to a "full off" position. I believe the accelerator switch is mounted on the throttle body in the 1997, maybe even as part of the throttle position sensor. I'd have to check the manual to be sure. I know in earlier models it was a microswitch mounted right at the accelerator pedal itself, but I remember reading somewhere it is on the throttle body in the current generation.

    Mr. Vivona
  • I wrote message 1014 and you responded with message 1015. It wasn't the accelerator cable sticking because there was never any unusual increase in the idle speed plus the cable operates very smoothly. I checked the throttle position sensor (TPS) which is where the switch that you mentioned is located. There was proper continuity and non-continuity at terminals 1 and 2 of the TPS depending on whether or not the accelerator pedal was depressed or released. This can be expected though, given the intermittent nature of the bump. Based on your obvious knowledge, I decided to change and set the TPS anyhow. I am happy to say that it has been nine days and 200 miles and the bump has not occurred except for the first two times that I stopped after changing and setting the TPS. My car has never gone 9 days or 200 miles without bumping since this problem began 2 years ago.

    I am a little confused about the two bumps immediately after the TPS was changed and set. If the computer tells the transmission not to shift to first while stopping based on patterns that the computer has learned then it would make sense to me that the bumps would occur immediately after changing and setting the TPS until the computer learned the new pattern. However, if the computer tells the transmission not to shift to first while stopping based on the signal that it immediately receives from the TPS then I am confused since the problem seems to be fixed but the TPS would have sent erroneous signals on the first two stops.

    Please tell me that the computer sends a signal to the transmission based on a learned pattern.

    Thank you Mr. Vivona.
  • vivonavivona Posts: 410
    ineed2cars -- I do not believe that the transmission has to learn the accelerator switch, but maybe it learns the throttle position and both may play a part in preventing a downshift to first. Time will tell.

    Any time you replace the TPS and adjust it, you should clean the throttle body first. The procedure can be found at:

    While cleaning the throttle body, make sure it is not worn in the inside area where the throttle plate closes at idle, or the throttle plate could occasionally be sticking just above idle. By replacing and adjusting the TPS, you may have moved the "switch point" a bit making is less likely to cause the problem. After cleaning the throttle body, readjust the TPS.

    Or, instead of cleaning now, just leave everything as it is and see if the problem comes back. If it does, clean and adjust as recommended.

    Mr. Vivona
  • I am from Kuwait. I have a Mitsubishi Magna which is the same as Diamante, year 2002.It comes in full options. Only 10000 miles. My problem is transmission many times doesn't shift to the 4th gear until the rpm reaches over 4000. I guess it's because of the learning transmission but it needs alot to learn. I have a vibration around 60 m/h ever since I bought it. tires were replaced and anyone...thanx.
  • regfootballregfootball Posts: 2,166
    over time the transmission will learn to shift more aggressively. hang in there.
  • Hello,
    I need some help on figuring out few problems on my 92 Diamante. First the key is stuck in the ignition and it wont come out, it starts the car so I am using a spare to open/lock the door, any idea what the problem might be.

    Second the car failed emmision and has recently been blowing a thick white smoke, this problem happened right after an oil change. can somebody please help me figure out the problems, because I am tired of my mechanic ripping me off, and also if its a major or minor problem.
  • at Fairfield and Vallejo (CA) Mitsubishi. I wish I needed a car!
  • vivonavivona Posts: 410
    sam73455 -- 10,000 miles is plenty of mileage for the transmission to learn your driving habits. I don't know if Mitsubishi publishes that actual number of miles, but I expect it is more like 50. The RPM at which your transmission shifts into 4th gear depends on how swiftly you are accelerating. For instance, a full throttle acceleration will delay shifts to about 6,000 RPM. If the transmission is waiting until 4,000 RPM even with gentle acceleration, I would suspect a sensor may not be giving the computer the correct input. See if your transmission computer shows any error codes.

    As to the tire vibration, the tires must be balanced using a force variance machine like the Hunter GSP9700. Read all about it at This machine places a roller against the tire with 700 pounds of force while the tire is being rotated for balancing. This measures the variance of the sidewall stiffness around the circumference of the tire and takes that into account when selecting the proper balancing weights. The resulting measurement is expressed in pounds of variance. You want each tire to have less than 15 pounds of variance after balancing.

    Mr. Vivona
  • regfootballregfootball Posts: 2,166
    anyone seen the 04 yet?
  • I am thinking about buying a used 1997-98 Mitsubishi Diamante because it is great used car value;however, I am being scared away from the car because i kept reading about transmission problems. Does this car have a bad transmission or am I reading just a small sampling of defects? Please advice. Thank you.
  • vivonavivona Posts: 410
    The 1997 had a service bulletin for a transmission upgrade to improve shift feel. Even including that issue, the Diamante has had an excellent reliability rating, including the transmission, for all years. Please see the Diamante ratings at e=Mitsubishi&model=Diamante&src=category#used

    You will see that every year of Diamante gets the full five green marks for tops in reliability. Clicking on the green bar for each year will take you to the details for the reliability rating. You can also click "Get More Information" and read all the reviews and owner comments. You can also check out what a fair purchase price would be.

    I think you will love a Diamante and have a good ownership experience. I have two (1999 and 2002) and both are real gems!

    Mr. Vivona
  • I want to thank you so much for your would I go about learning of the service bulletin and it's number? Is there any service manual that you would recommend? any other important resources or advice you can give me on this car? Thanks
  • vivonavivona Posts: 410
    Here is the service bulletin info on the 1997 Diamante transmission:
    Service Bulletin Num : 97110123014
    Date of Bulletin: NOV 01, 1997

    Your dealer's service department should be able to show you the full text of the service bulletin.

    The Mitsubishi Factory Service Manual is by far the best manual for do-it-yourself repairs. But, it will cost you over $100 from the dealer's parts department. You can get the best price by buying it though one of the many Mitsubishi dealers that sell at wholesale through, One such dealer is though you will have to contact them at 1-800-357-1892 to get a price on a service manual because it is not listed in their online store. Make sure you get a quote for a service manual, not an owner's manual.

    As to aftermarket, the only one I know of is the Chiltons at 699831/sr=8-1/ref=sr_8_1/103-0008596-4117434?v=glance&n=50784- 6 It is nowhere as comprehensive as the Mitsubishi manual, but it is under $20 and will give you a lot of what you need for doing your own service.

    Probably the most accurate review of the 1997 Diamante can be found at

    Mr. Vivona
  • My power steering seems to be dying on my 98 Diamante. About 4-5 months ago, it started groaning and "grinding" when making wide or sharp turns. This, coupled with the tell tale drops of fluid on my garage floor suggested the power steering fluid. No, I've never had it flushed. The car has 100k miles on it give or take. The P/S fluid refill was bone dry upon inspection, and so I filled it and have since refilled it when I hear the noise. The results are usually the same - immediately stopping the groaning noise and steering becomes silky smooth...for a while. Then, the leaks and the groans come back in spades weeks later, sometimes days later. I had Mitsu Svc inspect it and they say I need a new rack. There explanation for this was something like "these racks just start leaking when they get old. Or, it may have been damaged somehow". Ok. Apparently, these things are big money to replace (I had to sit down to stop from passing out at the cost) - about $800 something, and I'm not even sure if that includes tax. Assuming that it is the rack that is the cause of the problems, what if any danger is there in continuing driving this vehicle and replacing the fluid when needed? I've not had a problem (except the messy leaks) doing this (until I can afford the repair) ...until the other day, when I apparently put too much P/S fluid in the refill area; I have what I can only describe as VERY LOOSE steering, and an on again off again bizarre drifting type effect when I go into a tight turn at fast speeds. Replacing the tires didn't make a difference. Could the P/S rack or the fluid levels being undoubtedly maxed out be causing the weird drift? Thanks.
  • regfootballregfootball Posts: 2,166
    brought in the D for servicing today

    sales dude informed me of new additional incentive for current mitsu owners....another 3000 off on Diamantes.

    WOW, that's more incentives than GM even, hehe.

    showed me an ad for a 29k list Diamante for like 19,000.

    get it now......

    I wanted to test drive the Lancer Ralliart, but they didn't have one. Took out an OZ rally and really liked the car.....very nice small car. Excellent steering.
  • Well, lately my wife has been driving our 02 Diamante and recently she told me that she has been putting 87% gas in it. I realized that it does not have the same pick as before. Does it now need some fuel filter cleaning?

    Also I have put on about 33K miles in less than 2 years and the 30K miles maintainence package costs $599 at the Mitsubishi dealerships. I don't want to spend that kind of money. What is the recommended service for 30K miles? So far I only had oil changes. I got a K&N air filter when the car had 15K miles and don't think it will need replacement.
  • regfootballregfootball Posts: 2,166
    i was checking that out yesterday, coincidentally

    the dealer here had the 30k maintenance pkg. advertised for some absurdly high number like that.


    here was the primary bits i caught the most of it

    oil change
    tranny flush
    coolant flush
    chaeck belts hoses and brakes
    lube some hinges and driveline parts
    check driveline components
    change plugs and air filter

    and probably some other stuff

    thing is, it didn't appear to me to be anything worth 5-600 bucks.

    I'd think a non-dealer service center could do this much cheaper.

    as far as the gas goes, an extra dollar per fill won't equate to much more than 50 bucks a year. a drop in the pan compared to your car payment.

    better to keep the engine clean.
  • The dealership here does a lot extra, like tire rotation. I believe that's $200 at Mitsubishi dealerships.

    Thanks for the info. I think that anything over $150 for the services is too much. I could have done that myself but coolant and transmission fluild flush needs equipment that I don't have.
  • The antilock brake warning light is on steady and the traction control light flashes until I push the traction control off button then both lights stay on steady. Can you put jumper wire in the scan plug to obtain a code as to which wheel sensor is a problem? Where is this plug and what code should I be looking for??
  • lngtonge18lngtonge18 Posts: 2,228
    I would only get the tranny serviced at the dealer. I just had the 30k tranny flush done for my 02 Lancer at the dealer for $150. My manual says the coolant only needs to be flushed at 60k (the Diamante should be the same here). The spark plugs are capable of lasting 60k or more with no problems so I would put that off to 60k as well. The rest of the "checks" are simply a money maker for the dealer. You can have them rotate the tires if you feel you need it, but that shouldn't cost more then $40.

    Let me forewarn you though that Mitsu trannys are sensitive to the type of fluid used. I'm friends with my local dealer's service foreman. He said Mitsu will refuse to honor the powertrain warranty on the tranny should it fail due to using dextron fluid. Most quick lube joints use dextron, which is a thicker fluid then the SP3 that Mitsu uses. He said some trannys will operate ok on it and others failed after 10k. One guy was forced to go after super lube to get the tranny replaced because Mitsu wouldn't honor the warranty due to not using the proper fluid. With that in mind, I would either have the tranny serviced at the dealer or buy the fluid at a Mitsu dealer, make sure the shop uses that fluid, and keep the receipt. If you do go to the dealer, just specify you want the tranny service and that's it. You don't have to do the "30k package".
  • lngtonge18lngtonge18 Posts: 2,228
    Do you know where I can verify this 3k rebate for returning Mitsu customers?? I'm currently semi interested in trading in my Lancer for an 04 XG350. The Diamante is in the same class and if they offer that kind of deal, it would make it easier to trade in my Lancer with negative equity as well as stay in the reliable Mitsu family. The only problem is, the other half really likes the XG's looks. We aren't sure if we want to waste the money to upgrade to a more expensive car when my Lancer has been flawless in build quality and reliability (OZ automatic). But the desire to have a luxury car is intoxicating.
  • regfootballregfootball Posts: 2,166
    ads in the paper here and also confirmed by a salesman at local dealer.

    check with your dealer and also visit

    one dealer here has an 03 VR-X with 4k miles on it......if you would settle for lightly used its a great deal right now but no rebates. price is still cheaper than new. VR-X is sport version of Diamante.

    Basically figure 9-10 grand off list for new Diamante if you have loyalty.

    An XG is based on the Diamante anyways although in some ways has surpassed the Diamante. Either car is a nice car. XG is more traditional luxury cues.

    You have an OZ, right? I tested a manual OZ on Saturday and really liked it for the 12k price it was selling at. New.No ABS on it tho.
  • lngtonge18lngtonge18 Posts: 2,228
    Yea, I have an OZ automatic. It's been a great car! 31k trouble free miles, but the lack of luxury leaves me wanting more. Unfortunately, I bought the Lancer within a couple of months of it being released and it was the only OZ on the lot so I paid sticker. Thus, in combination with 000, I'm way upside down on the loan, so the 7k rebate would make the Diamante plausible, although I would still basically be paying 28k for a car that isn't worth that much. Uggh, I can't believe how badly resale has fallen for Mitsu. I would venture to say its now worse then Hyundai.

    What is your thought on this deal: I called a dealer who is 85 miles away. I spoke directly with the sales manager and he realized he would only have one shot at selling me a car. He has 1 03 D left, a black LS with gray interior but no traction control/heated seats (I would love to have the heated seats :( ), which I think is exactly what I'm looking for. The manager said he would give $1500 off sticker right off the bat plus the 7k in rebates. He gave a ballpark of 6-7k for my Lancer, which is ludicrous. I wouldn't take anything less then 8k. So, here's the lowdown: 27,500 for the D - 8k for lancer * .06 sales tax = 20677 + 16049 (payoff on Lancer, dont ask) - 7k = 29700 roughly. I might try to get him to drop down 1k or so, but it might be difficult. I know the deal is absolutely crazy, but what do you think? Is it possible to get the price of the D down any further and keep the tradein where its at? The thing that attracts me most about this deal, is even with all my negative equity I won't have to finance more then 100% of the car's worth, which should help me get a good interest rate. My Lancer's interest rate is 9.9 and I already planned on trying to trade it in a year from now which would put me still about the same negative equity but without the huge owner loyalty rebates.

    I feel I'm at a disadvantage since its the only D he has left that I could use the nice big rebate on and he knows that. But I also know the D has been on his lot 3-5 months and Mitsu sales are hurting. So help me out....have I lost my mind??
  • regfootballregfootball Posts: 2,166
    if the MSRP on an LS is 27,500 you should in theory get 2500+4000+3000 off that. 18-18.5 should be where the LS is.

    Used rental return D's are in big abundance here, which is why I've had 2 of them.

    As pleasant as a Diamante is I would have major issues paying over 20 for a new one. And your negative equity would leave you stuck way behind on the D. After 6 months you would owe 28 but the car wholesale would be worth 15.

    In your scenario a lease may work better for you.

    Get a Ralliart instead....LOL.
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