My friend just got a burnt exhaust valve replaced along with valve job. It was running great after i put it together but three months later it started to misfire. He took it to the shop n they fried his dizzy while performing a compression test. Compression was 180 across. Bought a new dizzy and it starts but its fluctuating at idle. I would get misfires from 1-4 and random misfiring code. It had a code for the IACV so i cleaned it out n the code is gone but its still idling bad. The engine drives great n has plenty of power but when u let the rpm down then the idle problem starts. The exhaust is smoking a little blue n oil needs to be put in once in a while.He also mentioned the coolant burns off as well but like i said the compression is good. Has anyone encountered this problem? I'm running out of ideas.

 

Stock Si?

What codes are currently thrown?

Current distributor - used, new, aftermarket, OEM?

 

Yes everything is stock except intake,headers,exhaust. Codes will start with p0301 and then p0302,p0303,p0304 n p1399 after driving it down the street but it doesnt feel like its misfiring. nice response when wanted.

 

current dizzy is brand new but not aftermarket though i suspected it might be that but havent ran any tests yet

 

i mean to say its not OEM but do u think too loose of a valve adjustment will cause such misfires?

 

So you have a brand new OEM distributor?

 

no i dont wished i could borrow someones n slap it on just to c if it fixes the problem

 

Aftermarket distributors are often problematic.

Also measure the fuel pressure.

How loose? Out of spec loose?

 

it ticks a little bit after i adjusted them so im jus saying its a little loose thats all. it was too tight before n it idle low n rough.

 

I had this problem too I had cams put in and the ticking were my valves being wayyy to loose sounded like a sewing machine. I had them adjusted correctly and now it's nice and quiet.

 

did u have the misfires along with that?

 

Might want to recheck the valve adjustment.

 

I still do at times when i first start the engine it will throw a light right away, But after i clear the light and drive it, it's fine. I've also been getting this P0505 idle malfunction code that i can't seem to get rid of too.