Hey Guys Got a tune yesterday conservative only 20 psi and that Night, service engine light(cylinder 1 misfire) came on and car sound like a subaru. Obviously running on 3 cylinders..

1st thing I did was check the plugs and replace them before going onto anything else figured It was time for a compression test. Turns out cylinder one compression is zero!!

Not really sure where to go next with this...
bent valve or cracked ring?!

 

When you did the compression test - did you add oil to cylinder #1 and re-do the test? If the compression goes up its a bad ring, if it doesn't its a bad valve.

Also, to have the low of compression usually indicates something major happened. Best case scenario, is your head gasket on cylinder #1 is toast.



-Bink

 

how much oil do I add? to retest?

 

An oil cap full.


-Bink

 

great advice!
i like seeing guys on here actually help people who are confused or lost, instead of telling them to search.
+1 for Bink!

 

Haha, thanks man. I try and help when and where I can


-Bink

 

When the car is running is there blue smoke coming out of the exhaust?


-Em

 

put oil in it and still zero.

 

no but there is some white smoke not sure if its because it cold or not.

 

Looks like you have to pull the head. Nothing crazy happen like a down shift when trying to up shift right? No over revving or anything like that?


-Em

 

Tuner set rev limit to 7875. Not sure how high you can rev these stock motors..

 

Bummer....yeah like Emery said - it's time to pull the head.

You can buy/rent a bore scope and maybe it will help to identify the issue, but either way, you will still have to remove the head to fix it.


-Bink

 

Ok well thanks for the help guys. Im taking to my buddy's garage and he's gonna pull the head for me. I will keep this updated.

 

You can also do a leakdown test and verify if it is the head or block. It is easier to pull the block complete than tear the head off them find the block is toast and have to pull that too. Sounds like a burnt valve to me. Some carbon prob got caught under the valve then got super hot from combustion gasses hitting it and burned the valve like a torch. I have seen it happen on cars that were poorly setup for a while doing this when they are finally running right. I had one that I got that was F'ed when the car was purchased and it ran great after I fixed the car up but it smoked the head in a few weeks.

 

Turned out to be a broken valve spring lol