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I own a 2009 Tacoma reg cab, 4wd, 4 cylinder, manual with 20K miles. At about 10K miles I noticed a harsh howl noise when going between 55-75 mph but only when light deceleration. Like when you just let your foot off the gas on the highway as you are going down hill. A slight apply of the throttle makes the noise go away. Put the transmission in neutral and/or push in the clutch and the noise is stays -- but now throttle position has no effect on the noise. The noise is very noticeable.
The dealer changed the rear fluid to some sort of synthetic-- no change. The dealer refused any further work on the truck since it has has a 2" non-stock lift with slightly larger tires.
I did a 1" diff drop for the front -- no changes.
I added an approx 2 deg axle shim on the rear -- no change.
I replaced the transfer case fluid with purple power 75-90 fluid -- no change.
I relubed all u-joints -- no change.
The next step is to replace transmission lube with purple power lube to see what this effect is -- but I just cannot see this working. I am stumped!!!!
Since the noise stays when in I am in neutral (or clutch in) then I would expect the that the motor and anything associated with motor is not the issue. ie air pump, fan clutch etc.
Since I am not in 4 wd, I can assume that it is not anything associated with the front end. Wheel bearings, wheel alignment, differential, etc.
My only other choice seems there is something in the transmission. I will do the purple power in the tranny to see if there is any change in the noise level or type of sound.
Any suggestions? Any ideas will help. Toyota refuses to help unless I remove all the mods done for the lift. Since nothing is broken, truck drives good, no abnormal sounds under heavy acceleration or deceleration -- it (hopefully) is nothing major.
Not sure if anybody has an answer, but I would appreciate any help. Email me at emberglo2001yahoo.com if you would like. Thanks for all your help.
Like you my pipe is black, and the mud flap and the lower rear body panel too. I thought it was running to rich, so at about 30k miles I changed to a K&N air filter hoping that would help lean it out. No noticable change. I now have 76k miles on it.
If any one knows something constructive about this, please let me know.
I love my truck, but this does not seem normal.
I went to the local Toyota service desk and talked to the assistant service manager about the problem. He pointed out that we don't actually know the starting level of the coolant, so it may have been down a little for the 15k and 30k services. I only put on about 8k or 9k miles a year, so it was at least a year and a half ago that the 30k service happened. I NEVER look at the coolant because it has never shown signs of problems and it's a young vehicle. The service guy also said the foam can easily be caused by condensation and would be considered normal, barring other symptoms. I do a lot of short trips and that makes it less likely that the condensation would be removed from a hot engine.
Both the Toyota service guy and my mechanic agree that we should watch the coolant and the oil more carefully for a while. I'm inclined to think that the coolant loss happened over a matter of years and is ultimately not something that indicates big problems (like the need to replace head gaskets at $2k.
Has anyone else had experience with this problem? I don't see much reference to it here, though there is some on a couple of the other boards.
Thanks in advance.
And why...??
A friend of mine has low air output, the fan noise varies, especially when going over a bump. The bearings are starting to go, probably needs replacement
You are a genius!
The whole thing took less than 10 minutes and my display is now brighter than ever. You saved me a wad of money
Thanks,
Chuck
Does anyone know the group code for 2005+ Tacoma car battery.
Thanks
I originally attempted to talk to Toyota via the phone but spoke to a very rude and nasty Case Manager, who basically said "too bad". When I asked to speak to her supervisor, she initially refused and said that Customer Support Supervisors do not talk to customers! She eventually gave me a name. I spoke to a supervisor the next day who was even more unprofessional and told me that he was the highest person in Toyota I could speak with and his decision to deny the warranty claim was final. He said I was lucky he called me back as supervisors don't talk to customers!!
He encouraged me to contact the President and CEO of Toyota, the BB and the Attorney General. So I wrote to the CEO and many other VP's pleading my case and letting them know that my family and I are loyal customers and would be purchasing another Toyota if they honored their warranty.
The answer was "the hole may have been overlooked in 2009, but you are now out of the warranty period".
So, I filed complaints with the BB, NHTSA, Consumer Protection Agency, The Attorney General and the Federal Trade Commission. I also contacted several well respected writers in the auto world at the NY Times and a local news station is considering "investigating" my complaint. I was hoping not to bring additional bad press to Toyota, but they left me no other alternative.
There is a new technique "afoot" wherein with a manual transmission the engine will be "up-revved" if a coastdown, engine compression braking, downshift or not, results in some level of driven wheel slip as a result of slippery road conditions.
The technique was originally developed by VW to reduce instances of loss of directional control on their manually equipped FWD cars and by now may have migrated to other fleets, even RWD.
And think about it, do you REALLY want the engine RPM down to idle when you "de-clutch" doing 75MPH on a slippery roadbed...?? Many new sports cars will now automatically "blip" the throttle as/when you downshift an automatic.
i've been driving sticks for 40 years...30 years in the high country of colorado.
Yes, i want the engine to idle down...i want to be in control of the vehicle...not the vehicle in control of me.
whether the roads are slippery or not if i release the accelerator i want to slow down, period. if it is actually designed this way then why doesn't it do it all the time...very spuratic....very inconsistent
the king is necked...the suit of cloths is the lie.
"...when you clutch it at high speeds the engine does not idle down, recently on snow packed roads in colorado.."
going down hill on slippery road, driver de-accelerorates, driving wheels slip, non-board computer detects slippage and revs up engine, vehicle increases in speed. sounds exactly what the stories are in the news, CAR SPEEDs UP ON IT'S OWN. so, maybe the vehicle hits a bump in the road....wheel slippage...vehicle accelerorates. possible a bit of sand on the road...same effect.
if this is indeed the intended design, then why doesn't toyota print this...why let unsuspecting drivers find out the hard way? and why does the engine rev down below 60mph like a normal vehicle? and why does the engine rev down when you tap the accelerator, sometimes? if what your saying is true then toyota is trying to make the vehicle smarter than the driver. that's just dumb. and the really big question...why did they try to explain it on faulty floor mats and accelerator pedals???? and why did NASA get involved if toyota purposely design the vehicle this way...they would have already know what was causing the problem?
or is just another government cover up conspirisey.
you sound like a smart guy west...maybe you have the answers...i'm all ears
No, just smarter than the AVERAGE driver....
Take a new Porsche 996 or 997, for instance.
The factory expects that anyone purchasing a Porsche in this class will know how to "drive" the vehicle. So the PSM, stability system, is designed to delay taking any corrective action, activity, until the driver has an opportunity to do so.
Toyota's VSC, on the other hand, acts INSTANTLY to correct any yawing condition because there in NO expectation of the AVERAGE driver having the experience, background, or knowledge as to how to correct for a plowing/understearing condition.
I called my husband and he won't be able to come look at it for a few hours. He seems to think I got gas with water in it, but I'm sure it could be anything.
Any advice would be greatly appreciated!
thanks in advance dja9520
Some addition information: Front Brakes were redone about 2 weeks ago
Thank you.