EJ22 popping out the exhaust

[pvenuti]

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, 2010 by pvenuti

[lmdew]

Sounds like it may have jumped timing a tooth.

[pvenuti]

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, 2010 by pvenuti

[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?

[johnceggleston]

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.

[pvenuti]

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

[pvenuti]

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%