I purchased a 1990 TT yeaterday. Pretty decent looking car but it has some mechanical issues. Cylinder 5 isn’t firing. Compression on all cylinders was good. I figure it has to be something with the ignition. When it first started acting up the number 5 injector was swapped out with another and it stopped briefly but now it’s back. I put all new spark plugs in with no change. Ohmed out the coils and they were all good. Swapped the number 5 coil with another cylinder and no change. Checked the coil pigtail and it is getting 12V with the key on and 14V while running. When I pulled the spark plugs they were all white-ish except the number 5 one. Any ideas for what else I can check? Thanks in advance. .
1990 300ZX TT, JWT ecu, Nismo 740s, HKS 2530s |