Engine surges at low rpm
I've had this problem off and on for a couple of months and can't get a fix on it. I spend alot of time driving in the 30-40 mph range. My car is a A4 and has BBK intake and throttle body LG long tubes with high flow cats, X pipe and Borla exhaust. I also have 3:42 gears with a 3200 stall.
Here is the problem: the car will start to shutter and shake when the I'm in the 30-40 mph range. It is intermitten and will some time make the check engine light flash but will go out once Igive it more rpm or the torque converter unlocks. It will generally set a to rich bank 1 and 2 and intermitten misfire codes even though the check engine light is not on. The car has a good tune on, done by charlie at RPM. I'm lost. Any help would be apprectiated. Thanks, Laurence :cheers: |
Sounds like a fuel problem. Have you changed where you get your gas over the past few weeks?
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Originally Posted by mellowyellow01vert
(Post 1567594926)
Sounds like a fuel problem. Have you changed where you get your gas over the past few weeks?
Ran tank almost dry, and filled with Shell Premium, and within a mile the engine was running like it should. I have a theory (and it is only that at this point) that with the usage of 10% ethanol, some stations are salting in water as a "filler" and pocketing some extra change. Ethanol absorbs water (and then mixes with gas), and would be easy to add, and most people would not notice the difference. Back in Illinois, when Ethanol first came out we found several stations increasing the percentage of ethanol significantly. The law said no more than 10%, but we found some stations always ran 16%-18%, and others in between. The Shell and Amoco (BP now) always ran on the money at 10%. In other words, try a different gas. Plasticman |
I only use Chevron and not from the same station. This problem has been going on for about 3 months now. It seemed to start when I put a trans cooler on and bypassed the radiator. I've been wondering if the trans is running to cold and when it locks up it won't unlock when the engine starts to bog down. Thanks for the inputs, anyone else because it has me frustrated. The car runs great under brisk acelleration
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pull your codes - even if the check engine light doesn't come on a code may be set. see what you get and post 'em.
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I get every time fuel trim toorich bank 1 and bank 2, also intermitten misfire.
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