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Old 06-14-2018, 02:51 PM   #1
lacks goats
woodenpudden's Avatar
Join Date: Sep 2005
Location: Princess Anne, MD
Default Idle misfire, very light throttle misfire - only when warmed up

'91 940 turbo, essentially stock except for Shane's fuel chip. It has a cold start injector. I have a copy of the LH2.4 greenbook and a meter, but haven't gone digging because I'm low on time, so I turn to you fine folks for a gentle nudge in the right direction so I can go from there.

Cold idle/driving is fine, and warm idle is fine for a little while; it consistently acts snotty only after sitting warm for a while, with stuff under hood heat soaked. At throttle tip-in, sometimes misfires a bunch, sometimes not, more throttle clears it up, runs fine on the highway. Grounds all pass the jiggle test (will check them all with a meter). Slight gas odor at the FPR.

Will check for obvious large vacuum leaks, TPS function with a meter, the usual ignition suspects before I check back in here.
Originally Posted by DMFWallace View Post

Flunt delivers!
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Old 06-14-2018, 03:40 PM   #2
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Join Date: Sep 2012

Do you have a wideband? Are you seeing anything there?

Have you made any recent changes? What do plugs look like?
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Old 06-14-2018, 04:09 PM   #3
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Join Date: Jun 2002
Location: S NJ, a suburb of Phila.

With heat soak electronics can get flaky. Like the ignition amp on the inner fender or the engine speed sensor and air mass sensor. I've had the ignition amp cause a stall and no start for awhile till it cools off. But that would only happen after about 20-30 minutes of driving.
1982 242 turbo. 340k miles. Good stuff and lots of rust.
1993 245 Classic, 417k miles, enem V15. IPD bars and chassis braces. Simons sport exhaust from Scandix. sbabbs ezk chip. Been a good road warrior. Genuine Volvo rebuilt leaky M47.
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