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Chevy Blazer GMC Jimmy Maintenance and Repair

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  • jlflemmonsjlflemmons Posts: 2,240
    Bingo on the 3.8. Years ago I had a '75 model 3.8. They called it a 231 back then, also known as the 'stagger-fire'. It used a V8 distributor with two plug wires removed. The set up fired 4 cylinders, skipped one, fired two, skipped one.

    The timing chain stretched and I had to replace it, and the nylon cam gear, at 20K miles.

    Weird engine, but developed a lot of low RPM torque.
  • jlflemmonsjlflemmons Posts: 2,240
    Okay, I pulled my books on that engine because I thought it used a chain, also. Well, guess what? It uses a chain from the crank to the FRONT cam gear. Then, there is a REAR cam gear that is helical cut and connects directly to the counterbalance shaft gear.

    So, the parts guy wasn't pulling your leg, it does use a conventional gear/chain/gear setup. And it also uses a gear/gear setup for the counterbalance. I knew something didn't seem right when I saw the gears and no chain. The 4.3 is based off the Chevy 5.7L engine, which uses a chain.

    Fairly easy repair, though. And if the oil has been maintained, the balance shaft gears are probably fine.

    Jim
  • Sounds like a time consuming pain for the 4WD. For those of us without a shop or good place to make this repair (especially outside in February) can you throw out a repair cost range (high/low)?

    I've had my '01 Jimmy for a little over a year (2nd owner, 65k miles) and have had a couple small oil drips below the drivers side pretty much since I bought it. Recently, I noticed the spotting getting larger. From everything I've read and can see it looks like I'm having the same problem with the oil cooler lines.
  • jlflemmonsjlflemmons Posts: 2,240
    You might want to clean the area well and confirm the source of the leak. A shop told us the lines were leaking on our '99. Turned out to be a small leak in the pwr steering pump that was dripping on the lines below. At ~1oz a year I will forego the repair for now, but it does make a bit of a mess on the oil cooler lines such that it would appear they are the source.
  • I have an 02 Blazer, 4.3, auto trans, and ran through some water on a flooded road. The SES light flickered but went off and four days later it came back on and hasn't gone off. Do you think the same thing applies here? Bad pump? It's only been about four days since the light came back on.
    Thanks, Rick
  • Thank you for the update... my next question... Does the factory cam gear have nylon teeth? I have 182K miles... and I have used Amsoil Synthetic Lubricants and filter. Is it time to replace them?

    Take care, TJ
  • jlflemmonsjlflemmons Posts: 2,240
    Well, the illustrations I have show metal gears all around. You might still consider changing out the chain though as it has surely stretched over this amount of miles. The Buick 3.8L was notorious for streching the chain, to the point that a tensioner was used to take up the slack.

    I will defer to others with more timing chain experience on the 4.3, but 187K is a lot of miles for the chain, and the repair is not that difficult on a small block Chevy engine. It is a monster repair on the aforementioned 3.8L.
  • jpmccrjpmccr Posts: 31
    Vehicle: 2001 Chevy Blazer LT, 4WD, 115,000 miles, V-6, Automatic. We went to my sister-in-laws in up state PA and they got snow. Went to put it in 4WD and the 4WD (4L) indicator light starts blinking. Checked 4H as well and it blinks as well. The front end would not lock in. A friend of the family said the blinking light indicated that there was a problem with the 4WD. Ok; is this something I can fix or is it something that is going to cost a ton money to fix???? I watched when my wife put in 4WD and the front wheels did not pull as they should. Any help/advice is greatly appreciated.
  • when i got this truck the guy put an L shaped vacuum connector under the truck somewhere he slid under the driver side door the exhaust is under the passenger side of truck. its 2 weeks later and the truck is running like it has a vacuum leak. anyone have ideas? i have read about a oxygen sensors but i cant find anything
  • tuttotutto Posts: 2
    Hi guys i have a problem with my truck when i start it in the morning and let it run for 5-10 min as soon as i put it in drive it starts bogging rpms jumping up and down does it until the engine get warm any idea guys i would appreciate it thanks
  • Please Help. I am trying to find the 3rd o2 sensor on my 95 Chevy Blazer. I found the one right before and after the cat, but can't find the one on the manifold. Been told there isn't one, then there is and it is the same sensor as the other two or it isn't. Haven't got a straight answer from anyone. If anyone can help that would be great. A pic would be awesome. Thanks in advance.
  • depends on how many wires you have on the sensor, and if the sensor is still there take it off and take it to your parts store for them to match it up
  • Thanks for ur response. I will try that and let u know how it works.
  • Try O2 sensors or EGR valve.
  • I need to know where on the truck the 3rd sensor is before I can take it off and bring it to a parts store.
  • tolesontoleson Posts: 9
    Ok so a little history on the truck. I acquired it from a family member wrecked. I put over 800 in parts in it and did all the work myself. I also had to have some mechanicals done to it as fallows, new computer,EGR valve,4 wheel drive vacuum actuator and cable,intake hose, and some other stuff. The 4 wheel worked after replacing the actuator and the cable but the next day it no longer does. If the switch works it all the when i try to put it in 4hi the light on 4hi and 4lo just flash and go back into to hi. Other times nothing will happen when you push the button for 4hi. The same thing happens if i try to use 4lo. Could it just be the switch? I cant get my hands on a one to test my theory.... Any input would be great. Thanks guys :confuse:
  • Yes I am having the same problems with my 97 Jimmy. We had to have the motor relaced because of the previous owner. It ran great with a 01 motor in it. We put on about 2k miles and then it started to stutter from stop to go. The idle is erratic and it through up like six codes. Five of which were Bank 1 Sensor 1 o2 sensor was shot. SO I replaced it. It helped for about a week now it's back to the same crap. WITH the P0300 code.I don't know what to do...if I can't fix it I am SCREWED!!! Ironically I moved up here to go to school to be a mechanic.. HA :cry:
  • tolesontoleson Posts: 9
    Hey guys i'm looking for alot of input on this one. I have a 1995 chevy blazer and Out of the blue iv'e lost both low beam lights. To make this problem even more interesting is the fact that when I turn on the high beams... Even though they work the blow the number 16 fuse for the turn signals. This truck has been a great truck I just hope this isn't anything major. I think it has to be something stupid. I just haven't found anything yet. PLEASE HELP! :sick: :confuse:
  • tjh5479tjh5479 Posts: 6
    Is the fuse for the headlights blown or does it keep blowing when you replace it?? If so, I hate to state the obvious which you probably already know, but most likely it is a short, and where that short is, is very hard to find unless you have the right tools. I am going to guess that maybe one of the wires leading up to the headlights may have been rubbing up agains something and is now bare. If the wires for the turn signals are bare as well, they may be touching causing a short. My Suggestion would be too read up about finding shorts, or bring it to someone who knows. Another thing you might try is changing the wiring harness for the headlights. If they are corroded that might do it too. Good luck.
  • tolesontoleson Posts: 9
    I just changed both headlights and the low beams mush have just been blown. And when i did that the signal lights came back. I thought this was interesting so i took it to my uncle and he said o yea that makes sense it is back feed. So I was just like sure and adjusted my headlights and went on with my life.

    Seems kind of weird to me. Must be chevy hired some people from ford to lay out the electrical!!

    Thank you for your input and happy driving!
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