Question about 1991 Volvo 940

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1995 940 wagon...stalls...ideas/help...please?

Hi, My 95 940 automatic stalls frequently when stopped at a red light and the transmission is in drive. The exact problem that occurs is that I will come to a stop, idle around 500, then the car starts to shake and the idle will waver up and down about 200 rpm for a few seconds, before all the warning lights come on and the car stalls. Also, when the transmission is shifted into either drive or reverse from either park or neutral, this seems to make the liklihood of stalling even greater I had spark plugs replaced last september, a complete check of the injection system, and a motor vac done. no leaks found on fuel lines...I am wondering, could it be a bad fuel pump? . If you have any ideas, or could confirm that it is just probably a bad fuel pump that is not outputting properly, please let me know! Thanks, -Zach Difficult start and stalling My 1991 Volvo 940 starts with some difficulty sometimes requiring two or 3 attempts before it fires up.It may emit this strange squeaking sound as it tries to start as if the engine is shaking up really hard.Once on the road it behaves perfectly fine until I slow down to stop at the red light, then it starts stuttering and shuddering like it wants to stall and the idling sound is somewhat irregular.When it stalls, it'll start again with several attempts but the moment I engage the gear and take my foot off the brake (Auto transmission), it stalls again. -It has a brand new (2 month old battery-RACQ) -I did a minor service a week ago to try sort it out but the problem persisted -A throttle clean was done and a scan of the codes didn't reveal much though they said it showed Air flow meter and MAF yet this model has no MAF or something like that. They also thought the leads to the spark plugs may be worn and show some signs of arcing I'm not prepared to pay for a variety of expensive electrical trial and error attempts considering it's an old car with 270Ks but in otherwise excellent condition.Will taking it to a specialsed Volvo garage improve the chances of an exact diagnosis? Many thanks Brian

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Could be several things; MAF ( Mass air Flow) sensor, (Yes you should have one), could be fuel pump on the rail or the filter next to it, could be electronic idle controler, clogged injectors, ect ect, a Volvo dealer can do some simple checks of the actual components and tell you, but have someone else fix it!

Posted on Nov 15, 2008

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Just for the fun of it, check the pcv valve and the related vacuum lines.
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What I plan to do next:
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After that I have no idea what to do next if the problem persists. The check engine light is not on so I don't think there are any error codes. Will let you know.

Frank
Frank's Friendly Cars Maui Car Rental
www.MauiCarRental.biz




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