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Very Rough Idle on Cold Start on Rescued Volvo

Help, Advice, Owners' Discussion and DIY Tutorials on all Volvo's "mid era" rear wheel drive Volvos.

1975 - 1993 240
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1982 - 1991 760
1986 - 1991 780
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1990 - 1998 960
1997 - 1998 V90/S90

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Posts: 5
Joined: Sat Jan 12, 2019 7:34 pm
Year and Model: 1992 244
Location: WA

Very Rough Idle on Cold Start on Rescued Volvo

Post by sweedespeed1 »


4th 240 here. Bought it cheap as a barely running project car. Runs pretty sweet now, except sometimes it runs super rough after cold start, then a minute later it's like a switch was flipped and it runs fine but with a slightly high idle. Can't find any vacuum leaks with carb cleaner. Did a full ignition tuneup, cleaned throttle body, replaced IAC, Bosch O2 sensor, intank fuel plump, MAF. It threw an EGR code a couple of times, so I blocked off and uplugged the system. I'm wondering if it's the engine temp sensor? Thanks
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