Db280z Posted November 13, 2014 Share Posted November 13, 2014 I have a 1977 Nissan 280z and i have about three major problems. The first is that the car jerks really bad when im going really slow in all my gears especially when i try to accelerate slowly. i feel like its coming from the differential. I still have to replace he mustache bar bushings and the differential mount. i am currently replacing the u-joints as well. i just want to make sure what to do before i start spending money left to right. the second problem i have is starting up the car in the mornings or at any time when the engine is cold it takes me about 3 to 4 minutes just to get it to turn on. The car turns over and over but sometimes it doesn't want to catch on until i keep trying over and over. i checked my fuel pressure regulator and that seems to be pushing out 40 psi, and the fuel pump has been replaced as well. the car does not tend to have this problem when the engine is warm. My third problem is that when I'm accelerating sometimes my rpm's stay up really high and i have to wait for it to slowly come back down in order for me to put it into gear so i don't get a bad shift. thanks for your help guys. Quote Link to comment Share on other sites More sharing options...
Dat260 Posted November 14, 2014 Share Posted November 14, 2014 Your going the right way in terms of checking mounts and bushings for the "jerking" symptoms. As for your cold start problem, do a search here Iam sure you can find something similar to your problem. There is a lot of good knowledge here, if you solve your issues post back what you did to fix it. Cheers, Quote Link to comment Share on other sites More sharing options...
NewZed Posted November 14, 2014 Share Posted November 14, 2014 The first problem could be either poor driving technique or a lean mixture. Some old AFM's run lean. You can fix them with a potentiometer on the cooling sensor circuit. Or you're just putting around at 1000 RPM. Second problem could be a bad check valve or bad FPR, leaking down. Check pressure before you do anything in the morning. Leave the gauge on. Third problem could be a dirty throttle body or weak/broken throttle return spring. Check your linkage. Also make sure that you don't just have big feet stuck on the pedal. You might be wasting money on u-joints since you don't know that they're really bad. Quote Link to comment Share on other sites More sharing options...
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