memphis280zx Posted October 4, 2012 Share Posted October 4, 2012 Hey guys im new to the forum and to working on z cars in general so i have a few questions that might sound stupid to average z enthusiast. i have an 82 280zx turbo that ive had for about 2 years now and ive been doing as much as i can to keep it running. As of right now ive replaced the engine wiring harness, alternator, fuel pump and filter, TPS, ECU, new injectors, new ngk-g spark plugs and wires. I can walk outside and crank my car right up and drive it around the neighborhood just fine, and honestly it runs better now than when i bought it. The problem im having now is once i start it and turn it off it wont start up again. It will turn over but doesnt fire up, its still getting spark and fuel. Being a beginner i assumed this was some sort of electrical issue or sensor somewhere but ive had no luck finding anything. So i did a compression test yesterday and it read 60 psi for the first 2, 65 psi for the middle two, and 70 psi for the last 2. Obviously thats way to low, but my question is can it be possible for the car to run then read that low? What should i look into replacing to fix this? Anyone else have this problem? And the strange part is ive sent it to the two most reputable z shops in Memphis(which isnt saying alot) and they couldnt do anything at all to help me. One said it was a computer issue and the other shop i guess didnt want to mess with it Quote Link to comment Share on other sites More sharing options...
Leon Posted October 4, 2012 Share Posted October 4, 2012 Adjust valve lash and check cam timing while doing so. The FSM has all the info for this, download it from xenons130.com. Quote Link to comment Share on other sites More sharing options...
chrisunknown Posted October 5, 2012 Share Posted October 5, 2012 I had the exact same problem. I could drive it all day long, but if i turned it off, it would not start for several hours. The problem went away when i replaced ECU. I've heard that you can open the computer and hit all the solder points with a really good soldering iron. I didn't try that though. Someone gave me a computer. Quote Link to comment Share on other sites More sharing options...
chrisunknown Posted October 5, 2012 Share Posted October 5, 2012 I didn't have the compression issue though. Quote Link to comment Share on other sites More sharing options...
memphis280zx Posted October 6, 2012 Author Share Posted October 6, 2012 A buddy of mine gave me his old ecu and it didnt change anything. What is the compression supposed to read at? I had trouble finding it and just assumed it was supposed to be at least 100-120. Quote Link to comment Share on other sites More sharing options...
Domzs Posted October 11, 2012 Share Posted October 11, 2012 Try to do wet compression test , put a little oil into the cylinder , to see if compression comes up . Was it running rich ? Quote Link to comment Share on other sites More sharing options...
NewZed Posted October 11, 2012 Share Posted October 11, 2012 A buddy of mine gave me his old ecu and it didnt change anything. Didn't change the cylinder pressure or didn't change the no-start after driving? More details will help you out. You said the car won't start after you drive it around but obviously it will after a certain amount of time. How much time? Coolant temperature? Checking cylinder pressure after the engine ran well is not really one of the first things to be done to diagnose a no-start. Working on cylinder pressure results is probably a wild goose chase. Quote Link to comment Share on other sites More sharing options...
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