DAT240Z Posted September 7, 2003 Share Posted September 7, 2003 I have a 83zxt in my 240z, lately the car had been running bad, what I mean is when driving the car serge, hesitate, jerks in the high RPM range I don't have any idea where to start checking. Today I put some cleaner in the fuel and went for a drive it jerked a couple of time and than ran great for about 5mins. and than started jerking, hesitating again. another thing I notice is when this is happening the tack jumps all over the place up and down. Any ideas guys on what could be me problem? Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted September 7, 2003 Share Posted September 7, 2003 The tach jumping is your best clue. You have an ignition problem. Check your plugs, wires, cap and rotor, coil, and trigger, and all your electrical connections. Quote Link to comment Share on other sites More sharing options...
lifegrddude Posted September 8, 2003 Share Posted September 8, 2003 Could be a sign of a dying fuel pump, clogged fuel filter, or maybe junk in the tank. John 82ZXT Quote Link to comment Share on other sites More sharing options...
Guest bastaad525 Posted September 8, 2003 Share Posted September 8, 2003 I've been having problems like this, a few of us here have been... unfortunately it could be all kinds of different things. Igntion, ECCS system... fuel pump... man... I feel for you dude, I haven't solved mine yet, and I've gone thru just about everything... Quote Link to comment Share on other sites More sharing options...
v8dats Posted September 9, 2003 Share Posted September 9, 2003 my old 260zxt did that then 3 days later the fuel pum died Quote Link to comment Share on other sites More sharing options...
cygnusx1 Posted September 14, 2003 Share Posted September 14, 2003 Hmmm..are you using a 240Z fuel tank or a 280ZX or 280Z fuel tank? My 280Z does that when I am very low on fuel. Z's need surge tanks when you start to put serious g-force on them. I would think that if you use a 240Z tank with a Turbo FI motor the problem would be even worse. My tach moves around a little when this happens but not much. Dave C. Quote Link to comment Share on other sites More sharing options...
DAT240Z Posted September 14, 2003 Author Share Posted September 14, 2003 Dvae I have a 75 280z fuel tank, I replaced the fuel pump today and the car still jerks, I notice this problem two days after i installed my LSD. but I don't think that has anything to do with. Tomorrow i am goint to switch out the disturbuter and see what it does. I was wouldering if it could be a stretched timing chain. Can someone tell what are the sings of a bad timing chain. Quote Link to comment Share on other sites More sharing options...
cygnusx1 Posted September 14, 2003 Share Posted September 14, 2003 When you put in the LSD did you bump any of the fuel lines accidently? Timing chain stretch is relatively easy to check. See any service manual. I doubt it is bad enough to cause surges in power but you never know. Quote Link to comment Share on other sites More sharing options...
BayAreaZT Posted September 14, 2003 Share Posted September 14, 2003 I have a 83zxt in my 240. I had a problem with the car jerking and hesitating. I just cleaned the AFM connector, TPS, and ECU connectors really good and the problem seemed to go away. It always seems to be something different with different people though so it could be any piece of the ECCS system. I'm running the stock 240 tank and it hasn't been a problem for me. Quote Link to comment Share on other sites More sharing options...
Guest bastaad525 Posted September 14, 2003 Share Posted September 14, 2003 yeah I'm thinking ECCS that's always the first thing you want to start checking. Clean everything like BayArea suggests, all the connections. Quote Link to comment Share on other sites More sharing options...
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