HELP! Multiple misfires, rough idle
#2
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Drove the car on the highway as usual. Car started bogging when trying to accelerate once I got off. Parked it at my buddies house, came out an hr later. Started it and got a really rough idle and all these codes started coming in. I cleared them and left the the car running with the rough idle and then the car started idling normal again for about 2 or 3 mins and then started idling at around . I had just replaced all the coils about 5 months ago with NGK plugs. The car has a small oil leak coming from somewhere that I just noticed about a week ago, but oil levels never dipped and gave me 0 issues. I'm gonna check the coils again, but im sure i need a compression teat to really figure this out. Has anyone had an experience with this issue? I read a couple with similar problems, but my CEL isnt blinking constantly like other posts said. Car drives ok, lost a little power but still drives decently. Where should I start?
#4
Ignoring the codes and reading your description I would immediately look for a vacuum leak. The fact the engine runs (so not the belt), when you get multiple error codes on all 4 (so not spark plugs or coils) it usually means something more common is the cause. A normal to slightly rough idle, poor power on acceleration but then runs reasonable well, most common cause is a vacuum leak. Check your hoses and hose connection points for cracks, holes, loose hose clamps. There's one that runs under the inlet manifold from the crankcase breather that can get heat effected and brittle (took me ages to find that one!) its hidden when looking from the top.
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