im really gettin annoyed my dream car that i have finally got keeps breaking down its a 300zx 94 non turbo i had overheatin probs i replaced the rad yesterturday now its havin probs startin and the revs dropped when drivin home is this a serious problem :headvswal :mad:

no it turns over and dont fire all the cars i have had this has caused the most problems

please help

First of all run an ECU test, this will check for error codes and gives you cause of problem.

 

Method 1 : http://www.ttzd.com/tech/diagnostictech.html

Method 2 : http://www.twinturbo.net/ttnetfaq/FAQpages/ECUdiagnostics.html

 

It does sound like possible PTU failure, very common. There is a Improved PTU that can be fitted.

This sounds familiar. Check the connectors on the PTU and CAS unit, make sure they are clean and making good contact. If they are not, the ECU will not give out an error code, will send a signal to the fuel pump to pump, and will not send signal to the injectors, or permit a spark to be provided, but when doing an ECU check you get a code 55, which is all OK.