Question about 1993 Volvo 940
The car starts fine but about 5 minutes later it starts to idle rough, speeding up and down a bit, then dies.
A mechanic has replaced the computer and some other parts..to no avail.
My old mechanic says that it's one of two relays, that cost about $30. He said that he found this out when troubleshooting another car years ago...when the relay was cold, it was fine. When warmed up with a hair dryer, the car acted up.
It could be the ignition modular i had a 1995 olds that did the same thing it ended up being ignition modual
Posted on Jan 03, 2012
Turned out that my old mechanic was right...it was one of the two relays up front.
Posted on Jan 15, 2009
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Posted on Jan 02, 2017
Tips for a great answer:
Here are the most common causes of idle surge, rough idle esp when cold and stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue 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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