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Join Date: Jun 2017
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1984 porsche 944 explosions

Any help would be appreciated...car turns on fine in the first turn of the key.. it idles fine but then once you press the gas it stutters and then does an explosion in the intake j boot... everything involving the fuel is new(fuel pump, filter, injectors, fuel, fuel pressure regulator ).. also anything involving the spark is new too (coil, rotor, distributor, plugs). My speed and reference sensors are new too...check every line and fixed for a vacuum leak and made sure all lines are routed correctly...

Hers a video of what's happing
https://youtu.be/Uas9cMsu9dA

This is what is coming out the exhaust

Old 06-08-2017, 05:42 PM
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That's weird. Could a valve be stuck open and the combustion is going back through the intake?
Old 06-09-2017, 11:18 AM
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Quote:
Originally Posted by JD159 View Post
That's weird. Could a valve be stuck open and the combustion is going back through the intake?
I don't think so because if I go slowly it doesn't do that, it accelerates, and revs but that to slow to be doing that on the road.
Old 06-09-2017, 11:33 AM
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i swear i replied to this thread last night but maybe not

classic lean backfire, if it idles OK then I suspect your TPS is ok but the sudden pop with a quick throttle application makes me think your AFM is worn or sticking.
Old 06-09-2017, 12:06 PM
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Yeah x2, I have seen a afm door get stuck all the way open...
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Old 06-17-2017, 03:49 AM
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X3 afm
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Old 06-17-2017, 11:34 AM
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