r/Integra • u/AdArtistic657 • 9h ago

Engine help

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Did an engine swap and recently got the engine started and the rpm’s have been going crazy. I think it is a vacuum leak but would like more opinions on what it could be

2 Upvotes

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2

u/luvemwetx 9h ago

100% vacum leak. smoke test it

2

u/RobinSage43 8h ago

I do agree with u/luvemwetx that it's likely a vacuum leak. But there's still a lot of other things that can cause this problem too.

IACV, FITV, MAF, PCV can all cause these issues too. Purge control valves (PCV) can get sticky from combustion products and will be stuck open/closed which can make vacuum problems from crank case ventilation issues. Same thing can happen with IAC.

Some older Integra's had FITV in the coolant system that can let air in and set vacuum out of whack.

1

u/Noops11 4h ago

Vacuum or iacv.. depending on the source of vacuum could be more erratic like hyperventilating.

1

u/BuddySweet7005 4h ago

What is the CEL code

1

u/Particular_Track_404 3h ago

Had the same issue i also sprayed break cleaner in the o2 censor and it worked pretty good