1997 Jeep grand cherokee Tsi is running like crap.....again - JeepForum.com

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post #1 of 7 Old 07-17-2011, 09:51 AM Thread Starter
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1997 ZJ 
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1997 Jeep grand cherokee Tsi is running like crap.....again

I bought a 97 Jeep Grand Cherokee back in February i have had nothing but problems with it since, Ive done a complete tune up replaced both O2 sensors replace the crank shaft position sensor and fuel pump. Since replacing the fuel pump and CSP the jeep had ran perfect till a few days ago. Now it has a hard time starting and it will randomly misfire or backfire in front of the catalytic converter. It will also just die on my while driving, It doesn't shut off but it has absolutely 0 throttle response when that happens i turn it off and restart it, it has a god awful smell almost like sulfur which im told is usually a bad catalytic converter. Any help is appreciated i love jeeps but im about to my wits end with this thing.

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post #2 of 7 Old 07-17-2011, 10:25 AM
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Change out the fuel pump relay just to eliminate the possibility. I may or may not fix it. You can swap it out with another relay in the PDC.
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post #3 of 7 Old 07-25-2011, 09:52 AM Thread Starter
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Ok so ive replace the fuel pump relay and have completely replaced my exhaust still stalling on me while driving, Anyone have and ideas?
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post #4 of 7 Old 07-25-2011, 09:57 AM
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If it stinks like sulfur the cat is bad. Not usually, always. And if the cat is clogged the vehicle will run like azz and might even die completely due to the exhaust flow being blocked, backfiring etc. Seems the best route might be to fix the cat and go from there.
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post #5 of 7 Old 07-25-2011, 11:17 AM
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Dying while driving is a common problem with the 96-98, because of the faulty PCMs that were manufactured for those years.

Some times, although you've replaced the crank sensor, the new sensor could cause problems if you've replaced it with a cheap after market brand.

Defective coil, or secondary ignition (wires, cap, rotor), ASD relay or any of the associated wires from the PCM to the ignition system could cause it. Checking the grounds any all the connector for good contact.

The back firing and serious smell is being caused by the raw fuel (and a lot of it) is still getting injected into the engine and exhaust while the ignition is being lost. You might not get any codes or receive misfire, multiple misfire, o2 codes. It's random.

I blew out a new exhaust system for the same problem.

The above are all the things you should do....., now do this....

and read this...http://www.jeepforum.com/forum/f13/i...8/index27.html
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post #6 of 7 Old 07-26-2011, 06:40 AM Thread Starter
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Guess i shoulve of added that i have replaced the pcm with a new one and have also replaced the asd relay.
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post #7 of 7 Old 07-26-2011, 07:19 AM
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If it was running rich before,the unburned fuel damaged the cat and it is now partially clogged from the melting of the substrate inside of the cat. Replace your cat...
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