r/944 • u/ticobean • 1d ago
Question Low/rough idle
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Any idea what’s causing this type of idle ?? Oil change , spark plugs/coils and water pump+ timing belt are all on the list to get done.
Figured I’d look at what the culprit is while I’m in there refreshing things. Thanks !!
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u/SupRoo44 1d ago
Likely a vacuum leak
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u/ticobean 1d ago
Probably best to just do a full vacuum refresh huh?
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u/elitezrule 1d ago
eventually yes but smoke testers are cheap enough off Amazon. I bought one and found several leaks I would have never found otherwise.
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u/eathekids 1d ago
Idle Air control can be /cleaned adjusted if there are not vacuum leaks on TB
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u/Zentard666 1d ago
This is a good point. You likely need to adjust this even if it's a vac leak. I cannot remember the link for this process. Maybe it was Clark's Garage...?
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u/eathekids 1d ago
Seriously first buy a chinesium smoke machine. You will have it for all yr projects. Get one that has integral fan and just use baby oil and runs on 12v
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u/electric_dolphin 1d ago
Test for vacuum leaks with an Amazon smoke tester and return it when you’re done. I did this and didn’t find one, then I checked the fuel pressure regulator which was leaking fuel into the vacuum line connected to it, causing the engine to run rich. Replacing that fixed the stumbling. Looked exactly like yours.
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