driftz240 Posted August 18, 2007 Share Posted August 18, 2007 i was running at a local drift event today and everything was going well untill the car all of the sudden started stumbleing and not reving past 4k rpm under load only, but revs free to 7k in neutral. heres what i have checked 1.made sure i had gas in the tank, tank is a aluminum fuel cell newer, foam is good 2. fuel pump, i have a msd efi pump, fairly new, stock fpr 3. tune up parts good, and maf is adjusted properly,new plugs, wires, cap rotor. 4. disconnected knock sensor, bypassed, tryed to bypass the cyl head temp sensor "not sure if thats possible" 5. checked for vac leaks, but car idles awesome and runs awesome to 4k where it hits a wall. friends said they saw black smoke when i start to stumble witch makes me think its rich or its cutting ignition, i think i have some problem with the cyl head sensor, ive had this problem a few months back and cleaned the terminals and it went away, but no luck this time.... any ideas Quote Link to comment Share on other sites More sharing options...
Administrators BRAAP Posted August 19, 2007 Administrators Share Posted August 19, 2007 Well, my first thought was fuel starvation, i.e. clogged fuel filter or pump inlet screen, but the black smoke throws that one out.. Hmmm… Let us know what you find. Paul Quote Link to comment Share on other sites More sharing options...
z-ya Posted August 19, 2007 Share Posted August 19, 2007 Are you running an AFM? If so, that might be the culprit. Quote Link to comment Share on other sites More sharing options...
Vintage Posted August 19, 2007 Share Posted August 19, 2007 Indeed, if your still using an AFM, make sure the boots are in good shape. I've heard that holes (which can hide in the folds of the rubber) can cause the L28 to just run out of steam around 3500-4000 rpms. Quote Link to comment Share on other sites More sharing options...
mario_82_ZXT Posted August 19, 2007 Share Posted August 19, 2007 Have you tried to rev it now that it has cooled down? It could also be ignition related. Mario Quote Link to comment Share on other sites More sharing options...
big-phil Posted August 19, 2007 Share Posted August 19, 2007 try unplugging the ecu, cleaning, and plug it back in. Thats worked for me in the past. Quote Link to comment Share on other sites More sharing options...
Guest incalescence Posted August 19, 2007 Share Posted August 19, 2007 Engine bay gotten wet at all? Sounds like classic symptoms of condensation on the TPS connector. I've had it not once, not twice, but three times. Same symptoms. I'd pull the connector, give it a good hit with compressed air to make sure there isn't any moisture built up, and make sure you don't have any corrosion on the terminals. Of course, this all assumes you're using the stock engine electronics. Quote Link to comment Share on other sites More sharing options...
driftz240 Posted August 19, 2007 Author Share Posted August 19, 2007 i have a break threw i cleaned all the connections with electric parts cleaner, and fired it up still same problem... i remember i had a cyl head temp sensor from a na 280zx in the box never opened so i installed it to see what would happen it revs up all the way to redline, but is very rich but drivable, but i want to change to the correct part for a turbo car.... what actually does the cyl head temp sensor dictate to the computer? and will it make the computer go into limp mode or cause this problem or am i barking up the wrong tree. Quote Link to comment Share on other sites More sharing options...
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