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Old 10-11-2018, 11:23 AM   #1
MilesLittlefoot
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Post possible misfire issue

I recently purchased a 940 turbo 1992 model year and she seems to have a an odd misfire i cannot seem to get rid of every 4th or 5th power stroke there is "fart" for lack of a better term i have replace plugs and wires the exhaust has been replaced with just a cat and a thrush glasspack 2.25 inch cat back. AEM dryflow filter and thats it for engine work work thus far i have a new fuel filter but im not sure that is the issue.

Any thoughts or ideas would be quite helpful at this point.
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Old 10-11-2018, 12:12 PM   #2
woodenpudden
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When does it do it - only at idle? When driving? Cold? During warmup? Fully warmed up?
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Old 10-11-2018, 12:13 PM   #3
PhysSDK2
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Could be a million things. Check for codes do a compression test on each cylinder. For good measure run some fuel system cleaner. Then here’s a short list: dirty injectors, bad fpr, vacuum leak, water in fuel, bad cap and rotor, exhaust manifold leak, bad injector ground, cps, carbon on valve stems. But it could be a million more things.
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Old 10-11-2018, 06:08 PM   #4
MilesLittlefoot
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Originally Posted by woodenpudden View Post
When does it do it - only at idle? When driving? Cold? During warmup? Fully warmed up?
it only does it at idle it seems to smooth out once you give it gas however it kinda sounds like a subaru how much of that is the glasspack im not sure lol
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Old 10-11-2018, 06:10 PM   #5
MilesLittlefoot
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Originally Posted by PhysSDK2 View Post
Could be a million things. Check for codes do a compression test on each cylinder. For good measure run some fuel system cleaner. Then here’s a short list: dirty injectors, bad fpr, vacuum leak, water in fuel, bad cap and rotor, exhaust manifold leak, bad injector ground, cps, carbon on valve stems. But it could be a million more things.
I was considering seafoaming the engine or sludgehammer but at 193k miles im not sure if thats the best idea without rebuilding the turbo first
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Old 10-12-2018, 11:54 AM   #6
Lazarus
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Check the valve adjustment. Seems to have more noticeable affect at idle.
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