97 Cherokee still stalling

[stefni4246]

Hello
My 97 Grand Cherokee has stalled on me several times in the past month or so. The first two times I had it towed, where nothing showed up to be wrong. A Jeep expert and several of the forum members here (thank you) suspected it could be the crankshaft position sensor.

I had that replaced last week, and was hoping that would be it, but unfortunately my vehicle stalled again Thursday night while I was on my way to a friends for an out of town trip. I sat by the side of the road for about twenty minutes and it finally started again and I got where I needed to be.

But, needless to say, I don't trust it anymore.

Anybody have any second ideas? To repeat the symptoms, I'll be tooling along, the engine kind of hiccups, then seems to lose all power from the gas pedal to the engine. I coast to a stop, try to start it again, and it will turn right over, kind of go chugga chugga chugga, and then die. But, as I said, this time I waited twenty minutes and it started and ran again.

Thank you in advance
Stephanie

[Utah_jeepster]

Sent my Friend Tim a letter ...he has a Grand Cherokee with the same type of problem...

Subject: ok this is the same prob you have
(included your write up)
Ok Tim your Grand has the same problem or had…did you ever fix it?

His reply:

Dude, I have changed all the sensors and the fuel pump in my Grand, As long as the weather is cold it runs great. Once the outside temp reaches about 60 same old thing. I read an article that since the battery main cable is ran originally in the harness that feeds the distributor and ac etc. I separated the wires and am still having the same result. I am going to replace the computer and see if it may be overheating and causing the shut down. I will let you know if I ever find the problem. Sorry dude.

: So as you can read he has since had no luck solving this issue as well, I will let you know if replacing the main computer fixes this problem. I know he wanted to take the grand down to Moab as well for our after EJS run.

[Lonnie]

Well i have a 94 grand cherokee and it did sort of the same thing i changed the EGR valve because it was leaking vacume and it seemed to fix it. I'm not sure if your year has one but if not i would look for vacume leakes somewhere else it's amazzing how much will go wrong with a tinny leak.
hope that might help

[Utah_jeepster]

Tim's problem is fixed...
Tim's Grands problem was a faulty oil pressure sending unit. Since the fuel pump doesn't have a sensor just a shut off pressure relay on the fuel rail we looked into what else has control of this relay, I.E. the oil pressure switch.
It only takes 4 PSI to start the motor, the would start after dieing all of sudden but it would only run for a few seconds and die. It would send the right pressure to the gage but give a faulty reading to the fuel pressure relay tripping the relay , thus shutting off the fuel pump.
A new oil pressure sensor and so far no repeats of his problem, we are still waiting for the weather to cooperate and drive the temp above 60 degrees so we can test this fix out but till it does, the grand is on the road and running fine.

[dropseys]

I had similar probs with my 96 XJ. But after changing the fuel pump over a year ago, knock on wood, i haven't had the problem since.