Why does engine rev up and down when I step on brake?
My engine isn't missing at idle or acceleration. When I step on the brake it revs up and down as if it is going to stop, but it doesn't. I let off the brake it revs/runs fine...
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Reputação: 61
Postado:
My engine isn't missing at idle or acceleration. When I step on the brake it revs up and down as if it is going to stop, but it doesn't. I let off the brake it revs/runs fine...
Reputação: 1,8 mil
Postado:
There are several different causes depending on the year and engine. If you provide that, I can steer you toward a possible solution. Let me know the year, engine model, and whether it is carbureted or fuel injected.
Some causes:
-vacuum leak
-egr valve damaging fuel line (Toyota recall)
-fast idle valve coolant tube clogged
-fast idle adjustment
-throttle position sensor malfunction
FYI
Opa! Mudei de ideia.
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