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Old 09-02-2016, 08:51 PM
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'97 Jeep Grand Cherokee ZJ Error Code P0351 problem starting

I've been reporting how great my '97 ZJ is after all the work I've done on her. While my wife was gone for three months I barely needed to go out, especially since my granddaughter was doing the shopping ( she is 27 and has lived with us most of her life). A few weeks ago I went out to start the Jeep and the battery was dead. I live in the Coachella Valley near Palm Pringle California. Since May the weather jumped over 105 degrees during the day and for the last three months each day averages over 115 degrees.
I carry a car jumper and hooked it up as the battery was an Autozone Optima top of the line battery less than a year old. With the charger I was able to start the Jeep. Jump to last week, my wife returned and the Jeep started so I made the 70 mile round trip to the airport in Palm Springs. Made a few stops and outside of a sew stalls, once I got on my way I picked up my wife, the jeep started right up and the battery had plenty of time to recharge. We got home just fine but it's been on my mind to take the jeep out and run around for a while but it's been so hot and humid I put it off until we needed to go out today. The engine cranked but wouldn't start. I had recharged the jump starter I keep in back and even while plugged in it wouldn't turn over. I smelled gas and decided I may have flooded her so I would let her sit for an hour or so.
I went out to try again and at first it cranked but wouldn't start. A few minutes later it stared but even with the gas pedal down she would die. I should add that before my wife left I had the fuel pump replaced as well as some cracked hoses. I was getting a misfire in cylinder 2 code but ultimately I couldn't trigger the check engine light and it seemed to run pretty well. Until today.
A little while ago I got her started but she kept dying. Finely I got her to turn over and run pretty smooth without touching the gas. I revel it a few time but decided against taking her out of the garage this time - still about 110 degrees and I didn't want to risk getting stuck.

I plugged my meter in and did a diagnostic. The only code that appeared was a Coil Problem P0351. I had a lot of work done including head gasket repaires (the heads were warped and not cracked so they were sent out to a machine shop by my mechanic to have them flattened and repaired. All leaks were repaired before I had the fuel pump replaced.

I'm lost as to coil problems. Can anyone help me get to the root of the P0351 error code. I planned to have her towed back to the Mechanic next Tuesday as there is nothing I can do during this holiday weekend and I'm hoping I'm not looking at a costly repair.

Any ideas would be greatly appreciated. Thanks for being here to discuss this problem.

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Old 09-07-2016, 03:55 PM
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'97 Jeep Grand Cherokee ZJ Error Code P0351 problem starting

Update that I hope will help others.

I left the message about my '97 ZJ 4.0L 4x4 with Off-road package misfire code in cylinder 2, and began stalling ( I did all the major repairs including warped cylinder head and fuel pump replacement). I finally reached a point where it issued a P0351 OBD2 error code and would not start or if able to start ran irradically and would stall without triggering the Check Engine warning. Finally had her towed to mechanic with Autozone Ignition system diagram and Autozone recommendations. Mechanic called this morning after rechecking the error codes. He verified that the Crankshaft Sensor and ignition switch is out of spec.
I broke off the 18 year old hood release knob and could not follow the cable through the firewall and into the engine compartment. I added this to the repair list and sent the cable with the jeep.
If you've been following my posts of problems that I needed some help with you may recall that the Serpentine belt screeched just after cold starting and engaging the air conditioner. If I left the A/C off and drove a few minutes then started the air conditioner it would start without screeching. My mechanic believed the belt was at fault even though he replaced it at the same time he replaced my A/C Compressor believes that the belt was at fault that we replaced when installing the new tensioner pulley and A/C Compressor last January. I have a two year warranty on the compressor and wanted him to check the noise before the warranty ran out (I have an agreement with him that he will warranty his labor and parts he supplies but if I can save money on the parts with a longer warranty then he will only cover his labor). At the time I was able to get a new compressor from Autozone for considerably less than he was able to get from his supplier and I agreed to risk the cost of labor if the Autozone part was defective. So at this point he only needed to replace the Serpentine belt that he supplied.

Total cost to repair $404.00 which I hoped it would not exceed. He's done all my major work and and called earlier to let me know the Jeep was finished and destabilize road tested it for about 30 minutes without any error codes being triggered. I expect to pick it up tomorrow (Thursday) and price is exactly what he quoted.

His specialty is Transmission rebuilding but he hires and trains his mechanics to do a wide variety of services. Has been open since '82 and is the most honest and accommodating shop I found in the 23 years we've lived here in the desert.

If you're in the Palm Springs California area (Coachella Valley) the shop is in Cathedral City - Gordon's Transmission on Cathedral Canyon Road. Owner is Adolfo Ampuero (bought the Gordons Transmission in 1982) is the owner.

Gordon's Transmission
36063 Cathedral Canyon Dr.
Cathedral City CA
United States
1 (760) 328-1115

Highly recommend him. Trains his employees and has a very low turn over rate. I've spoken privately with some employees who are very loyal to Adolfo.
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Old 09-08-2016, 07:32 PM
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Re: '97 Jeep Grand Cherokee ZJ Error Code P0351 problem starting

I picked up my Jeep this afternoon and she's running link new again. It was the Crankshaft Sensor and the ignition switch. He checked my tires (shop practice and inspected the transmission (his specialty) and replaced the hood release cable and pull that I supplied. Total cost, exactly what he quoted $404.78 including 8.5% sales tax on two parts he supplied.
Started right up and he tightened the pressure on the Serpentine belt. If he replaced it he did not charge additional for it since he put the belt in less than 6 months ago and he warranties all his work for one year. Didn't stall once on the 30 mile ride home.

So, in this case where I pulled the P0351 coil error code he checked each part recommended by Autozone and confirmed to was the Crankshaft Sensor that installs inside the bell casing of the transmission housing at the rear of the engine. When he installed the machined Cylinder heads that were warped but not cracked in 2014 he would gave verified the camshaft sensor and most of the ignition system so short of replacing the engine control module PROM or Ignition coils it is running line new again.
I'm glad it's the end of summer even though we are in the desert because I think it could probably use some coolant as the was just over 102 degrees and feta litter warm with the A/C running. If I can save a few dollars by recharging the system at the start of next spring.

I hope this info was helpful if you are experiencing either a misfire code or Ignition coil code on your Jeep.
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