1991 240sx idle and bogging problems

[240sx Powered by Nismo]

when i intially start up the car, its starts but then starts rattling and the whole car starts shaking. on top of that its smells like raw gas is coming from the muffler. i think i might have something wrong with my fuel system but not 100% sure. any suggestions on what this could be? if you could make any suggestions thanks for you help.

[mva801]

Ok this happened to me two days ago. It turned out to be the wires that connect to the mass air flow sensor. The little clip was broken, and the connection was loose and corroded. A bad signal from the mass air will cause all sorts of issues like that. Check that connection first, and if its corroded clean it with some electronics cleaner or non-chlorinated brake part cleaner, and put it back on with some dielectric grease. Also take the opportunity to clean the sensors on the MAF with the cleaner. Be careful not to touch the sensors tho, but you'll want to make sure there are no dirt deposits on them. Cost - $5 at Auto Zone. My cars now running better than it has since i got it.

[180fan]

wiggle test on injectors, cts, and the mafs should tell you which one is the culprit.

[240sx Powered by Nismo]

thanks guys. i will definately try that out and see if that is the problem.

[240sx Powered by Nismo]

another question. when this happened to your car did the car idle really bad?

[mva801]

Yes the idle surged up and down, then it would idle at like 100-200 rpms for a bit, but wouldn't die. I could also smell gas - so check those connections. I would also clean you mass air even if the connection looks fine. that could help.

[blackhand]

hi, i have the same problem since my rebuild, but the problem starts when the car rises to the warm or regular temp... anyone have any idea? i just rebuilt my car so it could be almost anything, but the car runs great when is cool,, thanks

[240sx Powered by Nismo]

i figured out that it was the mafs. i am replacing the whole thing. and then most likely the spark plugs and the wire just because i think i should. thanks guys for all your help.