I have a 92 EJ22 in a rear engine setup(engine swap using the factor ECU and harness). The car has become louder recently but not at all RPM’s. If I stand at the back of the car one had on the throttle one feeling the flow of the exhaust I can feel it popping just as it comes off idle and again when I release the throttle. I’m running delta cams so the idle is not completely smooth to begin with but I have done this test before and don’t ever recall the popping or light backfire like this. Any suggestions? Timing again or perhaps adjusting the valves? Any tests I can run before start tearing things apart. No codes on the ECU.

Edited July 25, 201015 yr by pvenuti

Sounds like it may have jumped timing a tooth.

Can anyone tell me if this is a frequent thing. Or somthing that I should be checking that allows this to happen? The rebuilt engine has 4k on it and subaru belt.

Edited July 26, 201015 yr by pvenuti

Just checked the timing. 44 teeth to the cam on the left 40.5 to the one on the right. Anyone else have a thought could it be a valve adjustment?

i have heard / read if you have a stuck exhaust valve, you can have the engine sucking air in through the exhaust. this will give you an unusual exhaust sound. hold a sheet of paper over the exhaust pipe while it is making the sound and see if it occasionally sucks in instead of always blowing out.

 

 

maybe.

Would that also show up with a compression check. Open valve equals low compression.

I did the leak down test last night and I think it’s pretty acceptable.

 

CLY 1 15%

CLY 3 11%

CLY 2 15%

CLY 4 12%