1990 300zx na turbo

[Dustin79]

I need help my car is misfiring on at least 3 cylinders. I checked compression and looks good pulled the coils out and check with a tested and they have spark. any help will be very great thanks for your time

[KornFlakeZ]

i would suggest you do a power balance test

Originally posted by robomatic12:
Pull the coilpack connectors one at a time and listen for an RPM drop. If pulling any connector does not drop the rpm it is not firing. Then we can further diagnose if it is a fuel or spark issue.

When you find the faulty cylinders, check if they have spark by swapping the coilpacks with a known good coilpack and see if it makes any difference. After checking it has spark, check the injectors by placing a long screwdriver ontop of the injector covers and place your ear on the screwdriver and listen for the injector working. Your going to want to hear a " twak twak twak " sound. If no sound is heard, then you have found a faulty injector and should be replaced. Repeat on all faulty cylinders. Hope its helps!

[t.mcginley.jr]

It could also be a faulty PTU or CAS and/or corrosion on ANY of the wires around there.

[Dustin79]

cylinder 1,4,6 are missing. pulled the coils and the rpms didnt change. I put a listen ear tool on the injectors and heard a little tick noise on the 3 that are not missing and heard nothing on the three that are missing. Have power on the injectors connectors so im going to change my injectors with new ones. What you guys think?

[t.mcginley.jr]

Yeah sure sounds like you have 3 dead injectors after doing those tests. At that point you might as well replace all 6 so you don't need to worry about the other 3 going out soon after.

[Jayjay228]

Hey did you get the injectors yet also did you get new style injectors. Was your car still driving on just the 3 cylinders thanks.

[t.mcginley.jr]

Was your car still driving on just the 3 cylinders thanks.

There's no way our cars would drive on 3 cylinders. It would be impressive if they could run at all on 3 cylinders. One dead cylinder will cause issues, two dead cylinders will probably make it undriveable. Three dead cylinders = fuggedaboutit