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stalls when it wants. 94 grand Cherokee?
got a 94 jeep grand cherrokee with a 4.0. it stalls while driving and starts it self back up from the tranny turning the engine over. it started after a 200 mile trip. seams to be worse with ac or cruise control on i think its related to the heat outside. its been very warm here and it seems the hotter it is the worse it is. my truck is NOT overheating, i had a fuel pressure tester on it when it stalled and it did not go below 30 but im not sure what the pressure should be, it runs fine at 30 and when it stalls the pressure does not drop, i had a problem like this befor but it set a crank sensor code and it was my crank sensor, this time i do not have any codes and i have an old snapon scanner without snap shot so i cant get the data at the stall point, anyone very familiar with jeeps, help would be great.
running fuel pressure is 31 lbs per all data, like stated before fuel pressure is ok even when it stalls. looking for something different
5 Answers
- David SLv 51 decade agoFavorite Answer
I've heard that the TPS can short out the 5 volt reference voltage on Jeep. Last one I did was crank sensor though. Possibly just a bad ignition coil.
- 4 years ago
hi Gary! looks such as you have a vacuum leak someplace to me. That I6 is infamous for ingesting the O-ring on the IAC valve, inflicting a surging idle and stalling. whilst you're doing the artwork your self, pull the valve, clean it up and replace the o-ring. If this does not help, there's some components that say the crank sensor is suspect with those engines in this age selection. Have heard of them being replaced each 2 years on some Jeeps. A PCV concern might additionally reason this stalling concern. maximum suitable thank you to ascertain and notice if that's your situation, i've got got here across, is to unplug the PCV valve hose from the place it connects to the air intake manifold, at which element, the engine could desire to improve that's rpms to approximately 1500 or so. Then positioned your thumb over the hose barb from the place you took the PCV line unfastened from. it may die immedietly. If no longer, then you definately've a vacuum leak someplace. the only different restoration i've got got here across in this looks like voodoo, yet i understand a Chrysler tech who this labored for. pass to the ECM and come across the torx head screws. decrease back them out approximately 2 finished turns each. Supposedly, the screws almost touch the circuit board and reason the electrical powered pulses to bounce below the main suitable situations. Backing them out a splash removes this concern, yet nevertheless holds the ECM securely. wish this facilitates!
- 1 decade ago
sounds like the fuel pump is overheating. Does it run better when tank is full if so replace fuelpump
Source(s): 39 yrs ase certifiedtech - How do you think about the answers? You can sign in to vote the answer.
