Question about 1994 Volvo 940
Many things could cause this issue. First of all; is there a check engine light? If not then it is probably a fuel-delivery issue, not many parts in the fuel system are linked to the computer and in turn do not trip trouble codes. If there is a check engine light then your local autoparts store should be able to scan and then you can tell us more.
Posted on Apr 26, 2010
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Posted on Jan 02, 2017
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Feb 24, 2014 | Cars & Trucks
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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