Question about 1991 Acura Legend

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Irratic idle at startup

At cold startup the idle revs up and down between 1000 and 2000 rpm for about 5 minutes. When the car warms up it goes down and runs normally.

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  • Noitall25 Jan 30, 2009

    My car revs basically just like yours does and it is very aggrivating. Also, my 94 Legend takes premium gas only...so 91 right? Seems like to much to put into a 6 cylinder..... so I put 89 octane in and I thought that it may have fixed the rev...not sure if it worked.

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  • Acura Master
  • 6,674 Answers

No check engine light? You have a couple of sensors that may be causing that, coolant temperature, incoming air temperature sensor to name 2 of them. Personally I'd have it put on a scan tool & remove the guess work. Some parts places will do it for free, well as long as you buy the parts there.

Posted on Jan 16, 2009

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Posted on Jan 02, 2017

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Not reving high on cold start


Here is the most common cause of surges and stalls and low idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake

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