Are all PCMs bound to fail?
I'm trying to do some preventative maintenance to the 127K mile 98 ZJ. We've had it 2 years now and the first thing to go was the radiator. With your help, I swapped it out for a CFS and I haven't had any issues. The fuel pump left my wife sitting, it was replaced and a few months later the check valve is letting fuel drain back into the tank. I have a bosch ready to replace it since we're tired of turning the key to on 3 times. I also have a new Mopar CPS ready to go in. I'm trying to address common problems before they occur and leave us sitting again. Lately I have been reading about the PCM issues many of you have had. I've been wondering if there is anything that can be done to prevent the known problem or is it age related? Mine is working fine (knock on wood). To me, that harness appears to put a lot of stress on the connectors, especially while on a bumpy road. There is a white colored tie that holds it to the firewall, but that appears to be it. Perhaps some large zip ties could be placed around the PCM to help stabilize things to limit shock to the connectors. I also wonder, are there ZJs that have really high miles and still have an original perfectly functional PCM? Maybe there were good ones and bad ones.
Most of the failing computers are of the 93-95 variety. The older models were susceptible to corrosion. Both of my zj's are on their original pcms with no problems (I should knock on wood). 256K on the 96 and 183K on the 98.
96 ZJ 4.0
98 ZJ 5.9
Be sure you don't have any exhaust leaks forward of the firewall. My theory is the extra heat has a detrimental effect on everything under the hood. No proof that this is the case, but it makes sense... to me anyhow...
I had a Mopar PCM in my 9er, parked it up for 2 years, went back to it and it was shot. Running the original again now till i get round to a Hemifever tune. The Mopar PCM had about 30K kilometers on it from new over about 6 years.
A man will pay $2 for a $1 item he needs.
A woman will pay $1 for a $2 item that she doesn't need but it's on sale.
Originally Posted by GRN74cj5 View Post
It's supposed to be bolted to the firewall with three torx head bolts.
Originally Posted by Exdecuk View Post
Had you left a battery tender on it and started it once a month it wouldn't have gone bad.
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