Not firing right

[NTRA08]

Yes, if you have a pulse and the injector is clean but the engine note doesn't change when you unplug that injector I have NFI what's going on....

Put it back together swap some injectors around and see if the problems follow the injector or the wiring..

well I got it back together and did what you said. I have pulse when its running and when i unplug it the engine note doesn't change. I swapped the injectors around again and it seems to follow the wiring and not the injectors. But only cyl. 1. I also have NFI whats going on.

---------- Post added at 02:31 AM ---------- Previous post was at 02:29 AM ----------

Another thing I know for a fact that it isn't the wiring harness because it did it on my 87 harness before I switched to a 91. And all I did to fix the problem that time was change the spark plugs.... So I think there is something seriously wrong with the motor.

Would an exhaust leak cause this happen?

 

[IJ.]

Time for a comp and leakdown test.

 

[NTRA08]

My bro says maybe I could have a valve seat that is worn. Or blow-by. Not at the cyl. to cyl. wall but the adjacent walls. I hope not. I don't want to have to tear the motor down. But I will definitely do a comp and leakdown test. BTW what time is it right now in Australia? I'm thinking early morning.

 

[IJ.]

5:45 pm Saturday here.

Comp and Leakdown will show if there's an issue

 

[NTRA08]

Damn I was way off.Saturday hasn't even started for me. Its 2:46am saturday in texas. But I will do a leakdown test and comp test in a few hours. I've got to get some sleep.

 

[NTRA08]

Okay I did a compression test today and after that I figured I don't need to do a leakdown test.

Here are the results:

Cyl.1: 78psi.
Cyl.2: 75psi.
Cyl.3: 170psi.
Cyl.4: 159psi.
Cyl.5: 150psi.
Cyl.6: 164psi.

I gonna jump out on a very big limb and say that the seal between cylinders 1 and 2 is gone and I have loss compression on both of the cylinders because of it. So I'm gonna say BHG!!!!

 

[IJ.]

More than likely but a leakdown would have told you if it were valves, rings or a BHG.

 

[NTRA08]

Either way I still have to take the head off. Another question. I have another motor sitting in the garage. Sorta like a backup motor. and it has the 1.2mm HKS metal head gasket on it. Is that too thin of a h/g. I know that the stock h/g is 1.38mm crushed. And what if I take the head gasket off the other motor and use it. Are they reusable after you have already crushed them?