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View Full Version : 94 V8 ZJ stalls when accelerating please help!

devzw3
09-08-2011, 09:42 PM
Hello everyone, I am just joining this site now because I don't know what to do anymore. My jeep (1994 V8 5.2L ZJ) has been experiencing this problem for about 4 weeks now and i still cant find what is causing it. When I accelerate the jeep at medium or high acceleration, it will die after about 3 seconds or so then if i let off the pedal quick enough, it comes back on otherwise it just stalls out and i have to start it back up. It happens more in the morning and through-out the day but not much at night. Other times, I could be going at about 45 or 50mph and it will do a quick sputter or jump and almost stall but it doesnt. Anyways, can anyone give me any ideas? could it be the crank sensor, MAP sensor, or?? I have replaced the Idle air control valve and the fuel pump and fuel filter. And i got no codes with the scanner. I just want to fix it already :( PLEASE HELP ME GUYS. the other forum i was apart of totally ignored my problem :/
2005JGC
09-09-2011, 12:49 AM
It could be many things... One of my first thoughts is fuel starvation. How is your fuel pressure?

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devzw3
09-09-2011, 02:34 PM
My fuel pressure is good. the normal is 31 and max is around 40 which is what my service book says is correct. It doesnt seem like a fuel problem though because if it were fuel, I think it would kind of sputter a little and die roughly. what I am expiriencing is complete just shut down in less than a second. On and driving at 1500 or so RPM to sudden drop to 0 RPM off when it stalls. and when it does its pausing thing, it drops to zero, then jumps back up to regular RPM if I let off the pedal quick enough. I have a few friends and family that believe it could be the MAP sensor so I'm thinking of getting a new one of those.
2005JGC
09-10-2011, 12:09 AM
With the vehicle running grab the black pcm connector (closest to the motor) and give it a gentle jiggle. If this induces your issue inspect the connector for a dirty or damaged pin... But its likely a loose internal connection in the pcm... I have seen this a number of times on the zj as recently as last week.

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devzw3
09-12-2011, 02:32 PM
Well Friday night I changed the MAP sensor and completely cleaned my throttle body and no more problem. I drove 140 miles yesterday and not one stall so it must be ok now. thanks for the help. and i did try that trick with the PCM a week ago but it didnt work lol
embers
09-13-2011, 09:23 PM
Hi Guy's this has been helpful for me also experiencing the same thing in my sons ZG. I have ordered an new TPS as this also seems a likely problem area and i am thinking maybe change the MAP sensor also.
2005JGC
09-14-2011, 01:12 AM
Well Friday night I changed the MAP sensor and completely cleaned my throttle body and no more problem. I drove 140 miles yesterday and not one stall so it must be ok now. thanks for the help. and i did try that trick with the PCM a week ago but it didnt work lol


Hey not a problem, glad that wasnt it! much cheaper ;)