97 ZJ cutting out

rivercrazy · 11-03-2009, 05:09 PM

My wifes '97 ZJ 4.0 Auto has been cutting out for a little while now. At first it seamed like it was only hasitating when making a left turn, but it really never died. I thought it could be the fuel pump. Now I'm thinking it's an electrical issue because it doesn't run rough like it's being starved of fuel, it just cuts out and it's doing it all the time now not just making a left turn. Everything else stays on when the engine dies and it will always start right back up.

It has a new CPS and most of the ignition system is new. I'm starting to think its the ECU. Any thoughts? This thing is driving me crazy!

ET JEEP · 11-03-2009, 06:14 PM

Check the ASD and Fuel Pump relays. Exchange the two and see if the problem then feels like fuel. The ASD relay controls ignition. It may be going bad. Intermittent problems are difficult to diagnose. It could be the ECU. You may have to wait until it fails totally.

rivercrazy · 11-06-2009, 04:17 PM

Quote:

Originally Posted by ET JEEP

Check the ASD and Fuel Pump relays. Exchange the two and see if the problem then feels like fuel. The ASD relay controls ignition. It may be going bad. Intermittent problems are difficult to diagnose. It could be the ECU. You may have to wait until it fails totally.

Swaped em...still the same. It seams like it is worse when she's cold but I don't really know anymore.

rivercrazy · 12-03-2009, 12:53 PM

Bump. + it sounds like a motor boat on cold start up. What could that be?

11-03-2009, 05:09 PM	#1
rivercrazy Seasoned Member Join Date: Oct 2009 Location: Northern Utah (land of the magic underwear) Posts: 420 My Photos 1992 Cherokee Year: 1992 Model: Cherokee Engine: 4.0L I6 Transmission: AW4 Transfer Case: NP231 Front Axle: D30 Rear Axle: C8.25 Tires: 30" A/T Lift Specifications: 4.5" Misc Accessories: Rear Shims and lots of Lucas Oil!	97 ZJ cutting out My wifes '97 ZJ 4.0 Auto has been cutting out for a little while now. At first it seamed like it was only hasitating when making a left turn, but it really never died. I thought it could be the fuel pump. Now I'm thinking it's an electrical issue because it doesn't run rough like it's being starved of fuel, it just cuts out and it's doing it all the time now not just making a left turn. Everything else stays on when the engine dies and it will always start right back up. It has a new CPS and most of the ignition system is new. I'm starting to think its the ECU. Any thoughts? This thing is driving me crazy! __________________ '92 XJ 2 door 4.5" & '97 ZJ stock (wifemobile) 4x4 is for people who think to themselves "I'd like to drive over that!"

12-03-2009, 12:53 PM	#4
rivercrazy Seasoned Member Join Date: Oct 2009 Location: Northern Utah (land of the magic underwear) Posts: 420 My Photos 1992 Cherokee Year: 1992 Model: Cherokee Engine: 4.0L I6 Transmission: AW4 Transfer Case: NP231 Front Axle: D30 Rear Axle: C8.25 Tires: 30" A/T Lift Specifications: 4.5" Misc Accessories: Rear Shims and lots of Lucas Oil!	Bump. + it sounds like a motor boat on cold start up. What could that be? __________________ '92 XJ 2 door 4.5" & '97 ZJ stock (wifemobile) 4x4 is for people who think to themselves "I'd like to drive over that!"

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11-03-2009, 06:14 PM	#2
ET JEEP Member Join Date: Sep 2009 Location: East Texas Posts: 204 My Photos 1997 Grand Cherokee Year: 1997 Model: Grand Cherokee Engine: 4.0 Transmission: 42RE	Check the ASD and Fuel Pump relays. Exchange the two and see if the problem then feels like fuel. The ASD relay controls ignition. It may be going bad. Intermittent problems are difficult to diagnose. It could be the ECU. You may have to wait until it fails totally.

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