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Mopar pcm for 6.4 #2605210
01/11/19 11:57 PM
01/11/19 11:57 PM
Joined: Jan 2003
Posts: 2,745
Cedar Lake IN
CRT Offline OP
master
CRT  Offline OP
master

Joined: Jan 2003
Posts: 2,745
Cedar Lake IN
I bought the mopar kit to wire my 6.4
It ran killer all summer. Now has what feels like a timing issue. Is the there a company that can test and or repair a Chrysler pcm ?

Re: Mopar pcm for 6.4 [Re: CRT] #2605212
01/12/19 12:01 AM
01/12/19 12:01 AM
Joined: Jan 2005
Posts: 4,136
Charlotte, North Carolina
sgcuda Offline
master
sgcuda  Offline
master

Joined: Jan 2005
Posts: 4,136
Charlotte, North Carolina
Is there a diagnostic port that you can pull codes from? Maybe just a sensor malfunction.

Re: Mopar pcm for 6.4 [Re: CRT] #2605225
01/12/19 12:18 AM
01/12/19 12:18 AM
Joined: Jan 2003
Posts: 2,745
Cedar Lake IN
CRT Offline OP
master
CRT  Offline OP
master

Joined: Jan 2003
Posts: 2,745
Cedar Lake IN
Yes. It's got a code for a large vacuum leak. Its popn like it has a timing issue

Re: Mopar pcm for 6.4 [Re: CRT] #2605227
01/12/19 12:26 AM
01/12/19 12:26 AM
Joined: Jan 2011
Posts: 4,578
Utah and Alaska
astjp2 Offline
master
astjp2  Offline
master

Joined: Jan 2011
Posts: 4,578
Utah and Alaska
ModuleGods PCM, jeep guys are using them for the 05/06 PCM's that are failing like crazy and their stuff seems to work better than others.
https://modulegods.com/powertrain-control-module-pcm/

Last edited by astjp2; 01/12/19 12:29 AM.

1941 Taylorcraft
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1998 Wrangler
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Re: Mopar pcm for 6.4 [Re: CRT] #2605313
01/12/19 09:35 AM
01/12/19 09:35 AM
Joined: Jan 2003
Posts: 6,038
Tulsa OK
Bad340fish Offline
master
Bad340fish  Offline
master

Joined: Jan 2003
Posts: 6,038
Tulsa OK
Have you checked fuel pressure, it could be very lean causing your problems?

What code does it have?


68 Barracuda Formula S 340
Re: Mopar pcm for 6.4 [Re: CRT] #2605318
01/12/19 10:18 AM
01/12/19 10:18 AM
Joined: Mar 2006
Posts: 7,476
MI, usa
dvw Offline
master
dvw  Offline
master

Joined: Mar 2006
Posts: 7,476
MI, usa
We have very few PCM issues that I've seen. What is the exact fault (Pxxxx?) you have?
Doug

Re: Mopar pcm for 6.4 [Re: CRT] #2605320
01/12/19 10:34 AM
01/12/19 10:34 AM
Joined: Jan 2005
Posts: 1,814
Milwaukee WI
T
TRENDZ Offline
top fuel
TRENDZ  Offline
top fuel
T

Joined: Jan 2005
Posts: 1,814
Milwaukee WI
Fuel pressure. Lean always pops through the intake.


"use it 'till it breaks, replace as needed"
Re: Mopar pcm for 6.4 [Re: CRT] #2605369
01/12/19 01:52 PM
01/12/19 01:52 PM
Joined: Jan 2003
Posts: 2,745
Cedar Lake IN
CRT Offline OP
master
CRT  Offline OP
master

Joined: Jan 2003
Posts: 2,745
Cedar Lake IN
Have a gage on the cowl 58 psi. Others feel it may be a valve spring. I am going to pull off the valve covers and look

Re: Mopar pcm for 6.4 [Re: CRT] #2605388
01/12/19 02:15 PM
01/12/19 02:15 PM
Joined: Jan 2005
Posts: 4,136
Charlotte, North Carolina
sgcuda Offline
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sgcuda  Offline
master

Joined: Jan 2005
Posts: 4,136
Charlotte, North Carolina
Valve spring is a very good possibility. Haven't seen that issue on the 6.4, but the 5.7's are a regular in our shop. Runs very rough, if it runs at all. It's amazing what a broken valve spring will cause the electronics to default to. Not just a simple fix anymore. You have to think it through. If it's a plastic intake manifold, suspect a vacuum line that fell off, crack, glued in plug that fell out. Is the idle speed higher than normal? If it is, I would suspect an intake issue. If not, I would be looking at valve springs, bent pushrods, etc...


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