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Posted on Jan 02, 2017
I have the solution to this problem. The firing order is off. I have an 89 Riviera and had the same problem. The placed the wires as shown in the repair manual, but for some reason that manual was wrong. Now the car purrs like a kitten.
Check the firing order. These cars can still run on 5 cylinders, but you will get the problem you have.
Trust me, this is what's wrong!
Posted on Mar 01, 2009
Try having your fuel injector cleaned, you can start with running fuel injector cleaner though your gas tank and if that does not help then you have to get it cleaned out professionally or even worst have the injector's replaced if they are bad.
The other thing that will give it bad fuel would be a bad air intake temperature sensor go bad, as for the ruff idle that is common to a dirty or stuck EGR valve.
Good luck and keep me posted, by the way, what kind of Garage did you take it too? And are there and DTC codes from the ECM?
Posted on May 26, 2009
I have this same car with exactly the same problem. Begins shaking at 40mph and stops shaking as soon as you let off the gas, but then begins again as soon as you press on the gas and smooths out as you get over 50. And the shaking is not felt through the steering wheel. Solution: Replace the transmission mounts. There are two of them, one on each side mounted on the frame right next to the shock strut. There is also a front and rear engine mount, but I replaced the two as described and shaking is gone.
Posted on Dec 13, 2009
SOURCE: i have lexus ls430 2001
Check your gas cap, it may not be sealing properly that's why your getting the VSC light on the dashboard. Eventualy the light will go out after you fix. Good luck.
Posted on Jun 06, 2011
Without hearing the squealing the only things I could suggest would be the other rotating components in your system like the AC compressor/Water pump/ Power Steering pump. Could also be a bad tensioner. Hope this helps, good luck
Posted on Jun 11, 2011
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