ok i have a 91 22re that is missing on #4 after warm up! i pull #4 plug wire when idling and no change it the way it runs. but the thing is when i first fire it up it runs smooth no missing! but after like 5 min of running it starts to miss on #4. i ran a compression test and it went, #1@165, #2@165, #3@165 #4@125? i no that is a lil low but is it low enough that it would cause #4 cylinder to be dead?

any help would be great!

 

Hmm...interesting. I have 62 psi in my #3 cylinder and it runs pretty smooth. I wonder whats up? Bump for an interesting thread!

 

Try two things:
1) Add oil to the cylinder (just a bit) see if it improves compression numbers.
2) Check valve lash on that cylinder. Too tight can cause that.

 

so i went to swap injectors today thinking that would be the culprit. and i decided to check the oil even though it had only been a few days since i checked it last and to my surprise the oil is white. blown head gasket. but there was no smoke coming out of the tail pipe and would a blown hg be causing my miss?

 

lol
you finally got up to 62??
ive seen you around here quite a few times

 

Yep...I have tried a product with pretty good results. My other cylinders aren't that good (#150 range) so yeah, its getting better. But I might just take it apart and rebuild it

Sorry for the thread jack!

 

blown hg could definitely cause a miss. Just think about how good a campfire burns when you throw a bunch of water in it . It also makes sense that it would only do it warmed up because thats when the t-stat opens.

But in all seriousness, get a leakdown test done. That'll confirm the blown HG.

Good news is on a 22re the HG job is pretty easy, me and my buddy planned to do his one weekend. We drove it saturday night.

 

Yeah, it is easy and you can do it fast...that is if you don't take the head in to get resurfaced