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I have a 1999 acura rL with 210,000. It started idling too low & occasionally stalls at idle. Once you touch the gas ever so slightly it recovers & is completely fine. New iridium plugs, new o2 sensors, new fuel filter, coolant is OK, I use 93 octane & then fuel injector cleaner about once a month. Idle air control was checked & is OK. No CEL. It almost seems as if the engine isn’t getting the gas is needs at idle. It sounds empty & tinny at idle, but again, sounds perfect when the gas pedal is pressed. NO other symptoms except very rarely there is slight hesitation between when you press the gas & when it finally responds. Sometimes it takes a second or 2, then the car takes off like a surge of gas entered the engine. Could this be something easy like the fuel pressure regulator valve, or a bad injector, or more likely a bad coil or valve problem? There IS minor fluttering in the engine in the winter when the engine in cold, like a playing card in bicycle spokes as a kid. Once the engine has run 15-20 min it goes away. But doesn’t happen in warm weather at all. Any ideas?
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Before we posted we read through all the articles on the site about idle & performance & none of those suggestions had solved the problem or showed any problems. We’ve got 3 stumped mechanics. No oil leaks, no coolant leaks, no vacuum leaks, normal pressure test & leakdown tests. New exhaust system 18months ago including thermostat & cat. Short of tearing the engine apart, we’re not sure what else to check. Again, no codes being thrown so we’re stumped. Don’t wanna keep throwing new parts at it without a better idea & don’t wanna pull out the engine if we’re overlooking something easy. Thanks for the help bro.
When the car is first started cold. (sitting over night) will
the car idle higher for cold idle? If not IAC is either not getting
signal or not working. Passages clogged. when the car gets up to temp
does the car idle normal?Hey collegeman. Thanks for posting. The opposite actually. It idles/performsif perfect at first start up & the colder it is the longer it performs better. The hotter air temps, the lower the rpms at idle. New air filter so its not that. Makes intersections tricky since its usually hotter on the road in traffic sitting still.
If this helps, popping the automatic tranny into neutral makes it better. But every now & then I have to touch the gas ever so slightly to raise the rpms. & then it sounds/feels perfect with more gas going through which is why I was thinking some type of fuel delivery issue.
Certainly these mechanics cleaned the throttle body/ plate when trouble shooting? Check the EGR valve and EGR passages as well for excessive carbon, or it the passages are clogged. College Man noted the IAC valve. That could be it too. Good luck
Thanks, yea to the 1st 2 there good. Funny iac came up. argued with my buddy about it. He said it’s good I said I thought it was going. We debated that for a good hour. He owes me a sixer if that’s it so I hope it is. My fridge is mighty empty haha
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