no spark from ignition coil

firefox750
0

Asked by May 07, 2009 at 09:49 PM about the 1998 Jeep Grand Cherokee Laredo

Question type: Maintenance & Repair

not getting spark from ignition coil, replaced coil, still no spark

27 Answers

inuevafreak
1,740

I have a 94 Jeep Grand Cherokee Laredo 4x4 straight 6 4.0. It started dying on my while driving. It did it periodically for a couple months then it started happening even more. Finally it would die while I was driving and as soon as I shut it off it would crank but not start. Normally after it sat for about an hour it would start back up. Replaced cam sensor/distributor pick-up, crankshaft sensor and fuel filter. Among changing u-joints and fixing the exhaust. Drove it after that it did great....drove for about 20 minutes and it didn't die. Well I decieded to shut it off about a mile and half from my house like an idiot I listened to my uncle and did it. Well it wouldn't start, ended up towing it home. Replaced the coil and nothing....replaced thermostat, found out it was stuck almost completely shut, engine barely had water in it. Started up fine a couple times then back to just cranking. Switched relay for fuel pump and ignition and starts up runs great then after about 20 minutes shut it off and back to just cranking again. Fuel pump does work. Replaced distributor cap as well. If anyone has any idea what it could be please tell me. Thank you

119 out of 119 people think this is helpful.
inuevafreak
1,740

I forgot, my coil isn't firing but its new, not sure if its because of the wiring from the cranksensor or what but both are brand new will check wiring though.

55 out of 55 people think this is helpful.
Terrancegotta
100

Have a 95 olds 98 coilpack no spak Change coil and module.

10 out of 10 people think this is helpful.
big88sub
110

this forum is probably old and no one is still watching this post but my 97 jeep grand cherokee was just doing what everyone is complaing about and i had replaced all the same stuff. coil o2 throttle positioning sensor all that and it finally took a shit today in the rain and i was reading these posts and checked my computer conection and they were fine but i jiggled connection while running and it stated messing up and put back and was fine. eachtime i moved harness it would act up and harness is realy loose at the comptuer at the connecter closest to the fender. check it out and see if it helps you.

11 out of 11 people think this is helpful.
dustyjr97
370

My 96 has the same problem and there's no power to the coil and a changed the crankshaft sensor and still nothing the fuse box clicks and so does the evaporation canister

33 out of 33 people think this is helpful.
Patrick Vander
140

my 97 Cherokee has the same problem many parts been replaced

14 out of 14 people think this is helpful.
Stephanie Shelton
100

I have a 95 oldsmobile 98 modile it was driving fine only had it a few weeks it started cutting off while driving it like it just lost power no noise no knocking slight vibration from time to time but would crank back up in less than a minute but then one day it did it same way but this time it want start back up turns over all lights come on but want start has fuel pressure fuel pump working,starter fine,battery fine changed crank shaft sensor and spark plugs n wires and coil pack but still not spark I'm lost .......

9 out of 9 people think this is helpful.
donthavaclue
140

My escort had the same and after replacing coil pack, wires, checking all connections it turns out it was a bad ignition switch. Too many keys caused tumbler to short out

donthavaclue
140

Also check power relay which is inline between ignition switch and I ignition module. Ford used these often found behind glove box

1 out of 1 people think this is helpful.
Stephanie Shelton
100

It was ignition module it runs now but still stalling occasionally but saw somethin bout a coil pack housing

1 out of 1 people think this is helpful.
Mike Watkins
345

It's most likely the crankshaft position sensor. It's mounted on the bellhousing. Easiest way to change it is with a really long extension and swivel socket from the bottom. Looking at the engine from the rear, the crank sensor is at about the 11:00 position. They're a little tricky to get at the mounting bolt, but if you're fairly handy with mechanical things, it's not too big of a deal. I did one in about a half hour on my '96.

15 out of 15 people think this is helpful.
drewzazu
90

Had the same problem same year of Jeep. Changed the crank position sensor and seems to have cured the problem. Is a bit of a bugger to change but it is do-able.

7 out of 7 people think this is helpful.
donthavaclue
140

crank sensor bad which lets the computer know the engine is rotating so start feeding fuel and send power to coil

13 out of 13 people think this is helpful.
miamioldschool1
80

So your engine is cranking..fuel is ok and needless to say your car has not seen a new shiney new part in awhile. Simple things are the obviouse! Grounding straps and connections. Most folks forget that makin that engine shine means water and solvents can creep in and disconnect the " bond " between engine and ECU....check grounding locations between engine block and body. If the engine cranks but, does not fire...think about the many times the " ignition switch " is used....1000x's. Hope this helps.

8 out of 8 people think this is helpful.
undercovergbf
230

No fire to coil pack.engine cranks but will not start

23 out of 23 people think this is helpful.
BryanS80
110

1996 Jeep Cherokee 4.0. Cuts off while driving. Losing signal to fire between distributor and computer. When running stops firing and loads up with gas and starts back backfiring exploding the muffler. My jeep has been to 7 different shops. Every wire has been traced down and connectors checked. Majority of these jeeps are the same. They were built with electonics equevelent to most house hold electronics and they just dont hold up. Most mechanics wont touch it when i say its electrical problems on a jeep cherokee. I have replaced the following. distributor distributor cap rotary button cam sensor throttle position sensor crank sensor wires and plugs Altenator coil oil pressure sensor radiator thermostate Computer battery added a 75 amp fuse to the conectors on the fuse box under the hood from the battery. Antitheft relay in the interior fuse box. Rebuilt transmission rebuilt 4 wheel drive I wasted a lot of time and money on this jeep. The only thing i now left to do is part it out or crush it.

6 out of 6 people think this is helpful.
Gdumers
50

1993 grand Cherokee 4.0 eng has similar problem. Problem started with failure to start but if I left the key switch on, in a few minutes I cud hear the fuel pump come on and then it wud start. But there was no spark in the ignition til that point. It finally bit the dust and does not start at all now Replaced crank sensor, Distributor emitter, coil, and computer. I will try the ignition sw now

5 out of 5 people think this is helpful.
BryanS80
110

Mine finally quit too. I said what the hell i backed the two screws out in the computer housing located underneath the computer plug. Not the mounting screws but the ones in the actual case. I COULDN'T BELIEVE IT ACTUALLY WORKED. LIKE A NEW CAR.

5 out of 5 people think this is helpful.
DirtRoad Rider
110

!!!Help i bought this 1996 jeep grand Cherokee limited v8 4x4 5.2 318with a hydrolocked motor. I bought the same motor 318 5.2 out ofa 95 and put it in everything went smoothly also bought a fuel pump fuel filter computer ,spark plugs ,wires, new battery. It has fuel pressure turns over but doesn't start ...no spark to coil im lost i checked all my grounds and fuses wiggled all the wires and relays.... im really stumped someonE anyone could give me some advice id appreciate it. :)))

11 out of 11 people think this is helpful.
brandolie
30

Lol on all these jeeps it is a funny fix after all the time and money look under plug #5 others a stud on the block with several grounds on it even if nut is tight take those wire ends and clean the geese off problem solved

3 out of 3 people think this is helpful.
pjboards
40

ne coil pack, new plugs, new fuel filter, air filter,, you name it , its been put on and all the Cherokee tricks have been tried., unplug neg cable, 3 time turn the keys, put code reader on reset code,, Jeep runs bust still shows the same code P0351,,, Im at at a loss..PJ

2 out of 2 people think this is helpful.
pjboards
40

Mine is a 1999 grand Cherokee Laredo inline 6, 4x4 automatic. Started misfiring with one code coming up P0351, which is cylinder#1 secondary ignition fault code. I replaced the complete coil pack and same code came up , then several other codes would come up all in relation to cylinder misfires. DO NOT replace you ignition coil pack with Autozone. The staff stressed that it was the correct one , that that's what it shows on the computer and that's what it calls for and that the harness was needed for the upgrade. That pack is for a 2000 model and the harness is so that it will fit to connect to your 99. DONT DO IT!! Oreillys has the right ignition pack for 99 , no harness needed. never the less, the misfire is still present with same code. Tries all the tricks, unplugging negative cable, hit the ignition switch 3 times, it will tell you your code, Ive used a scanner to check the code and to try and reset the code. it will tell you the code but not reset the code which means that part is still bad. , and yes I have purchased new parts that were bad to start off with, so Im hoping that's what it is , because Ive tried just about everything I can think about, this is my 4th Cherokee, so wish me luck or shoot me some ideas..If I can help somebody let me know,, Ive had Cherokees and wranglers and sometimes believe it or not, a plug was the only thing needed to be unplugged for 2 minutes and then plugged back in and my wrangler ran great..

2 out of 2 people think this is helpful.
clemd
20

I have a grand Cherokee 4.7 left side not firing

2 out of 2 people think this is helpful.
bradwill20
90

i have a 1993 Jeep Grand Cherokee Laredo 4.0 that i have just finished rebuilding and tried to start and the situation i am in is crank no start i have no fire and my fuel pump relay isnt kicking on the fuel pump i have checked the ignition coil all fuses and i have replaced crankshaft position sensor and i still have no spark can someone please help?

9 out of 9 people think this is helpful.
jsoares
30

I came here looking for answers but seems I'm not the only one with this problem. My 93 jeep grand Cherokee started off by stalling while driving but would start right back up and was fine for awhile. Then one day it just wouldn't start back up. We replaced the coil, distributor, spark plugs,wires, crankshaft and much more. Still won't start. turns over but no spark to start. We also checked all wires and connections. We are officially lost on what to do.

3 out of 3 people think this is helpful.
dustyjr97
370

everyone on here will think im crazy but ive solved my problem and it was something so simple it was actually my ignition fuse in under my passenger side dash. maybe this will help?

4 out of 4 people think this is helpful.
Czacharys
0

I have a 1993 jeep Cherokee Sport 4.0L. This car is possessed. It has been stalling randomly at speed, an abrupt and sudden drop to 0 RPM, sometimes it would catch itself and go back to normal, other times it would stall out. After some research I suspected the crankshaft position sensor. I took it in to the mechanic, and they said my PCM, the main computer in the jeep was faulty and they couldn't test to see what sensors might be at fault. Ok, so I bought the new computer, they drove it for 20 miles and didn't record any error messages from anywhere in the car. EXCELLENT! Problem solved right? Only for the evening. The next morning my car stalled out on the highway, wouldn't start. It did crank over, and no dimming of dash lights or signal lights were noted. When I got it back to the house I took the battery in and had it tested. Bad battery. Bought a new one, car started, ran well for 20 minutes at idle, then died. It started up each time afterwards. But I still have issues with it stalling out on the road. Just had the alternator tested, it appears to be operating properly. My suspect list: - The crank shaft sensor over heats after a while and fails, but when cool indicates no problems. - The ignition coil is going bad and causing the plugs to simultaneously cease firing. - I've checked my ground wires, but maybe I missed one that is bad? - some other electrical demonic presence? HELP! This car is driving me insane.

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