Ask the Car People.SM


Jeep Grand Cherokee PCM Module Replacement

159 messages,  Last post on Aug 04, 2012 at 2:30 AM

You are in the Jeep Cherokee and Jeep Grand Cherokee Forum.

What is this discussion about? Jeep Grand Cherokee, Jeep, Electrical, SUV

Messages Page 2 of 16

#11 of 159 Re: 1993 jeep Grand cherokee PCM? [tuggajb] by jeffwtuttle

Nov 13, 2007 (11:39 pm)

Replying to: tuggajb (Oct 24, 2007 3:19 pm)
I did check to make sure that the rotor was turning and the distrbutor was moving correctly. I am just getting frustrated at all the dead ends? The dealer said it was a PCM and I replaced it but it still did the same thing? They put on the paperwork that they checked the coil,CPS, and the camshaft position sensor and said it was fine. another option I was thinking about was to have my PCM tested or rebuilt.? I guess from what I have resurched so for that Borg Warner re builds them? This way if there is nothing wrong with the pcm I could take it back to the dealership and get my money back for there wrong diagnoses?
 
Any help here is great!
thanks in advance!
Jeff

#12 of 159 Re: 1993 jeep Grand cherokee PCM? [jeffwtuttle] by lunghd

Nov 14, 2007 (5:27 am)

Replying to: jeffwtuttle (Oct 24, 2007 7:41 am)
Sounds like the cam shaft position sensor - located below rotor. Easy to replace on newer engines & NAPA / AutoZone etc part...

#13 of 159 Re: 1993 jeep Grand cherokee PCM? [lunghd] by jeffwtuttle

Nov 14, 2007 (8:11 am)

Replying to: lunghd (Nov 14, 2007 5:27 am)
The dealer said and also posted on the bill that the camshaft sensor was good.? Should I replace it just out of elimanating that fron the equation?

#14 of 159 Re: 1993 jeep Grand cherokee PCM? [jeffwtuttle] by jeffwtuttle

Nov 17, 2007 (1:41 pm)

Replying to: jeffwtuttle (Nov 14, 2007 8:11 am)
Any Ideas on what to do next? I would like to get my Jeep back on the road! Any help here would be great! Thanks

#15 of 159 Re: 1993 jeep Grand cherokee PCM? [jeffwtuttle] by tuggajb

Nov 17, 2007 (3:37 pm)

Replying to: jeffwtuttle (Nov 17, 2007 1:41 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 159 Re: 1993 jeep Grand cherokee PCM? [tuggajb] by jeffwtuttle

Nov 17, 2007 (5:13 pm)

Replying to: tuggajb (Nov 17, 2007 3:37 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 159 Re: 1993 jeep Grand cherokee PCM? [jeffwtuttle] by tuggajb

Nov 18, 2007 (5:38 pm)

Replying to: jeffwtuttle (Nov 17, 2007 5:13 pm)
could be
were you getting any spark at plug (should be a good blue white color)

#18 of 159 1993 jeep Grand cherokee PCM? by jeffwtuttle

Nov 19, 2007 (7:26 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.
Jeff

#19 of 159 Re: 1993 jeep Grand cherokee PCM? [jeffwtuttle] by tuggajb

Nov 20, 2007 (3:33 pm)

Replying to: jeffwtuttle (Nov 19, 2007 7:26 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 159 Re: 1993 jeep Grand cherokee PCM? by jeffwtuttle

Nov 20, 2007 (3:52 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?
Thanks
Jeff

Messages Page 2 of 16

To POST a message, please Sign In.

Advertisement

Browse by Category

Browse by Vehicle
   View All Vehicles

Browse by Board
Browse by Topic
View All Topics

Edmunds Community

Advertisement