Last post on Jun 01, 2013 at 11:25 PM
You are in the Jeep Cherokee and Jeep Grand Cherokee
What is this discussion about?
Jeep Grand Cherokee, Jeep, Electrical, SUV
#15 of 160 Re: 1993 jeep Grand cherokee PCM? [jeffwtuttle]
Nov 17, 2007 (2:37 pm)
if you get spark to the dis you should get spark out no matter what position cam is in so if you remove spark plug and ground the center electrod to the engine it should spark when some one turns the engine over if it does then you can check that firing order is right
to check remove number 1ne spark plug put your finger on the spark plug hole and have some one turn over engine when you start to feel pressure on your finger stop turning over engine and then move it with fan belt to get to top dead center
remove dis cap and see if roter is pointing to where number 1ne plug wire is if so
try this stuff and get back to me
#16 of 160 Re: 1993 jeep Grand cherokee PCM? [tuggajb]
Nov 17, 2007 (4:13 pm)
I checked for spark after the distributor cap and firing order but it still won't fire off. Could a weak coil cause a poor spark, subsequently not getting enough spark to the plugs???
#17 of 160 Re: 1993 jeep Grand cherokee PCM? [jeffwtuttle]
Nov 18, 2007 (4:38 pm)
were you getting any spark at plug (should be a good blue white color)
#18 of 160 1993 jeep Grand cherokee PCM?
Nov 19, 2007 (6:26 pm)
Again, I am not getting any spark to the plugs. I pulled the wire off and put a new spark plug in the end of the wire and saw no spark. If the spark was low/poor from the coil woild it still have spark at the end of the spark plug wire? I checked to make sure the firing order was right and it is. This is what happend to start off with, I was pulling my boat out of the water and stoped at the top of the boat ramp and turned off the engine. It NEVER restarted and this is where we sit now. I am sure is somthing realy stupid because it was running just fine before I turned it off. Thanks so much for all the help.
#19 of 160 Re: 1993 jeep Grand cherokee PCM? [jeffwtuttle]
Nov 20, 2007 (2:33 pm)
try and just hook the coil wire to your new spark plug and see if you get a good spark should realey spark when you turn the enginne over
#20 of 160 Re: 1993 jeep Grand cherokee PCM?
Nov 20, 2007 (2:52 pm)
I did that and the spark looks ok? I am just at a loss on why there would be spark at the coil and to the end of the coil wire into the cap but not out into the plugs? Am I going tin the wrong direction here?
#21 of 160 Re: 1993 jeep Grand cherokee PCM? [jeffwtuttle]
Nov 20, 2007 (6:11 pm)
try to put the old roter back on sounds as if you have a bad roter even thogh it is new just replace the old stuff back on and see if you get spark has to be short inside dis cap or roter
#22 of 160 1993 jeep Grand cherokee PCM?
Nov 20, 2007 (7:44 pm)
Did that too, still the same problem. Besides It just quit on the boat ramp and wouldnt start so I replaced the cap and rotor 2 times now one with the jeep oem and one with the schucks aftermarket. them I put the one that was on the car back on and still the same thing...3 bad rotors?
#23 of 160 2000 JGC - will not start
Nov 23, 2007 (4:28 am)
I am reluctant to take my jeep into the dealer but have had no other choice. The jeep has a new battery for starters and cranks over, just does not start. The fuel gauge is not reading with the key in the on position. The dealer says they need 2-3 hours just to figure out what might be wrong. They are indicating maybe the PCM, TCM or the cluster.. they don't know. Currently he indicates he can't communicate with them. I have looked through a lot of information and it appears maybe the PCM is the problem. Two Questions
Given the symptons does any one have any advice?
Does any one know where to get a PCM other than the dealership that is legitimate and a decent price.
Any help would be great thanks.