1998 Jeep Wrangler Stalls While Driving

1998 JEEP WRANGLER
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MOONSHINE7015
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jeep wrangler, TJ 1998 220,000 2.5

this is a new thing for Eugene - we'll be going along, doing fine - 70 miles/hr or so... and he'll just start to stall....like he's not getting any gas - and he'll buck until i get him to the side of the road. when idling - he's smooth - but when i try to give him gas to go, he stalls. they have changed the crank sensor - and we thought that was was the problem - but he did it again....now the kicker is - if you let him sit for about 15 minutes - he'll start up, and run like nothing is wrong! the garage can't duplicate what's happening - so are only going on my description. has this happened to anyone else?
Feb 20, 2007 at 4:17 AM
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RASMATAZ
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[quote:a874203b19="moonshine7015"]jeep wrangler, TJ 1998 220,000 2.5

this is a new thing for Eugene - we'll be going along, doing fine - 70 miles/hr or so... and he'll just start to stall....like he's not getting any gas - and he'll buck until i get him to the side of the road. when idling - he's smooth - but when i try to give him gas to go, he stalls. they have changed the crank sensor - and we thought that was was the problem - but he did it again....now the kicker is - if you let him sit for about 15 minutes - he'll start up, and run like nothing is wrong! the garage can't duplicate what's happening - so are only going on my description. has this happened to anyone else?[/quote:a874203b19]

Lets try the fuel system 1st-have the fuel pressure check
Feb 20, 2007 at 6:29 PM
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ROB66ERT
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WOW....you have just described my exact problem.....I have changed, fuel pump, fuel filter, egr valve, TPS, map sensor, both relays- fuel pump, and IAC relay and IAC motor, pluggs, wires, dist capp, roter, egr sylinoid, ecm, I am stumped!!!!!!!!!!!if you figuar this out please let me know, I think I am pretty competent as a mech. worked on my own veh, since I was 15, now 42 but this one has me stumped, only thing I can think of is now changing the ecu. I promise it will get worse mine is to the point it will run perfect for about 5-10 min, but I can now depress the clutch, turn off ignition, hold in clutch restart and continue running fine all while still moving...something seems to be resetting when the ignition is turned off and back on....please keep me posted if you figure this out....

thanks
Mar 31, 2008 at 6:09 AM
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RASMATAZ
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You sure its not possessed

You have changed the fuel pump but do you know that its producing the correct pressure? You need to monitor it -to catch the culprit on the act or it could be an ignition component that's going whack

You might be right with PCM or get it reflash and see what happens-
Mar 31, 2008 at 7:40 AM
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ROB66ERT
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maybe possessed, never thought of that?lol..... yes I have checked the fuel pressure, 50-60lbs, I have come to the conclusion, that it has to be the pcm. however I did not think about getting it flashed, I called Oriellys and they can do it for me, other than that I don't know..it has to be something that is resetting with the ignition, everytime it is turned off and back on, it is fine for a few min.....got any ideas what else maybe resetting....
Thanks
Mar 31, 2008 at 8:50 AM
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RASMATAZ
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Last shot partner-lets try testing out the auto shutdown relay or substitute with a good one/replace it and see what happens- A problem with this ASD relay will disable the ignition coil/fuel injectors and fuel pump its the main power feed to these components- Location see below


https://images.2carpros.com/forum/automotive_pictures/12900_ASD_relay_3.jpg

Mar 31, 2008 at 11:57 AM
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ROB66ERT
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I will try first thing in the am.... if not relay I am going to go have the pcm flashed...I will let you know what happens


thanks
Mar 31, 2008 at 6:32 PM
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ROB66ERT
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I had the ECU flashed, started the jeep been running perfect forthe last day and half.......Thanks alot, its on its way!!!!!!!!!!!!!!!
Apr 2, 2008 at 10:25 AM

Suggested Repair

Check fuel pressure while the stall happens and test or substitute the auto shutdown (ASD) relay, which powers the coil, injectors, and fuel pump. If those check out, have the PCM/ECU reflashed; that resolved the similar stalling.

Conversation Summary

A 1998 Jeep Wrangler 2.5 stalled and bucked at highway speed as if starved of fuel, then idled but died when throttle was applied. After about 15 minutes it restarted and ran normally. A crankshaft sensor replacement did not fix it, and the shop could not reproduce the fault. Another owner with the same pattern had already replaced the fuel pump, filter, sensors, relays, ignition parts, and ECM, with fuel pressure at 50-60 psi, and found the problem reset when the ignition was cycled. The expert advised confirming fuel pressure, considering an ignition fault or PCM reflash, and testing or replacing the ASD relay. After an ECU flash, that Jeep ran normally for a day and a half.

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