mopar pcm issues?
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mopar pcm issues?
I bought my neon roughly 2 weeks ago and it was equipped with a mopar pcm. After research, I have concluded that this pcm changes the rev limit to 7400 rpm on a 1995 SOHC motor with a MTX as I have. After installing a tach cluster the car redlines at 5500 rpm in neutral and 6150 rpm in gear. Also this was tested on 3 different clusters... Anybody have any ideas or than maybe a mopar sticker stuck on a stock PCM? Thanks in advance.
1995 2dr Plymouth Neon SOHC MTX
Crane 14, nitrous oxide, race ported head, SAFC 2, few more extras.
Crane 14, nitrous oxide, race ported head, SAFC 2, few more extras.
I dont think the rev limit is 7400 on a sohc mopar pcm, I think it is 7200. You can try unhooking your egr to see if you get a code, you shouldnt get a code with the mopar. Since its a 95 you can do the same with your downstream o2 sensor.
1995 Highline Coupe SOHC MTX.
DOHC Mopar PCM
e85, 30lb injectors, LM-1, SAFC
Custom CAI, 60mm MPx TB, AMM Box Intake, DOHC pistons, built4race UDP
PT Clutch, 3.94 FD
AF/X LTH, High Flow Cat, Spiral Flow, 2.5" piping, Flowmaster 80 series
P&P Magnum head, Crane springs, Crane 007, AEM 3-bolt cam gear almost ready to bolt on
DOHC Mopar PCM
e85, 30lb injectors, LM-1, SAFC
Custom CAI, 60mm MPx TB, AMM Box Intake, DOHC pistons, built4race UDP
PT Clutch, 3.94 FD
AF/X LTH, High Flow Cat, Spiral Flow, 2.5" piping, Flowmaster 80 series
P&P Magnum head, Crane springs, Crane 007, AEM 3-bolt cam gear almost ready to bolt on
I dont think the rev limit is 7400 on a sohc mopar pcm, I think it is 7200. You can try unhooking your egr to see if you get a code, you shouldnt get a code with the mopar. Since its a 95 you can do the same with your downstream o2 sensor.
1995 Highline Coupe SOHC MTX.
DOHC Mopar PCM
e85, 30lb injectors, LM-1, SAFC
Custom CAI, 60mm MPx TB, AMM Box Intake, DOHC pistons, built4race UDP
PT Clutch, 3.94 FD
AF/X LTH, High Flow Cat, Spiral Flow, 2.5" piping, Flowmaster 80 series
P&P Magnum head, Crane springs, Crane 007, AEM 3-bolt cam gear almost ready to bolt on
DOHC Mopar PCM
e85, 30lb injectors, LM-1, SAFC
Custom CAI, 60mm MPx TB, AMM Box Intake, DOHC pistons, built4race UDP
PT Clutch, 3.94 FD
AF/X LTH, High Flow Cat, Spiral Flow, 2.5" piping, Flowmaster 80 series
P&P Magnum head, Crane springs, Crane 007, AEM 3-bolt cam gear almost ready to bolt on
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Thanks for your replies. Oddly enough the EGR is blocked off and down stream O2 has been unplugged since I bought the car so I installed my wideband in the bung. The CEL does come on and go off. Usually more on than off though. I'm not 100% sure how to read the flashing CEL with the 5 on/off cycle, but I can tell you that it does flash...
When I bought the car it had no battery ran pig rich and sputtered when cold as if the PCM was advancing timing too soon which led me to believe that it was a mopar PCM, but it never crossed my mind as much jerry rigging as I have found with the car that the PCM could be going out or something else rather sketchy.
When I bought the car it had no battery ran pig rich and sputtered when cold as if the PCM was advancing timing too soon which led me to believe that it was a mopar PCM, but it never crossed my mind as much jerry rigging as I have found with the car that the PCM could be going out or something else rather sketchy.
1995 2dr Plymouth Neon SOHC MTX
Crane 14, nitrous oxide, race ported head, SAFC 2, few more extras.
Crane 14, nitrous oxide, race ported head, SAFC 2, few more extras.
The light be missing from the CEL slot. I think you should try and get the codes. Cycle the key 3 times on/off and leave it on on the 3rd time. After that count the flashes. You'll have short pauses, which means that you should still count, and long pauses, which means it's separated. So, read it like this
flash, flash, flash, pause, flash, flash.
That would translate to 32. 3 flashes, then 2 flashes. Get what I'm saying?
flash, flash, flash, pause, flash, flash.
That would translate to 32. 3 flashes, then 2 flashes. Get what I'm saying?
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They almost always give a code 12 first, meaning the battery has been unhooked recently, if it hasnt you may not get that. It will always end with code 55, meaning the code reading process is over.
1995 Highline Coupe SOHC MTX.
DOHC Mopar PCM
e85, 30lb injectors, LM-1, SAFC
Custom CAI, 60mm MPx TB, AMM Box Intake, DOHC pistons, built4race UDP
PT Clutch, 3.94 FD
AF/X LTH, High Flow Cat, Spiral Flow, 2.5" piping, Flowmaster 80 series
P&P Magnum head, Crane springs, Crane 007, AEM 3-bolt cam gear almost ready to bolt on
DOHC Mopar PCM
e85, 30lb injectors, LM-1, SAFC
Custom CAI, 60mm MPx TB, AMM Box Intake, DOHC pistons, built4race UDP
PT Clutch, 3.94 FD
AF/X LTH, High Flow Cat, Spiral Flow, 2.5" piping, Flowmaster 80 series
P&P Magnum head, Crane springs, Crane 007, AEM 3-bolt cam gear almost ready to bolt on
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- Joined: Thu Apr 07, 2011 4:07 am
- Location: Alabama
Okay... So flashes counted shows 12, 21, 44, 23, and 55. Am I correct in my assumptions that this is IAT sensor out of range, O2 up or dowstream out of range, and battery temp sensor? I am in the process of moving the old downstream to upstream position and testing. I will keep you posted.
1995 2dr Plymouth Neon SOHC MTX
Crane 14, nitrous oxide, race ported head, SAFC 2, few more extras.
Crane 14, nitrous oxide, race ported head, SAFC 2, few more extras.
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12- battery disconnected
21- O2 sensor problem (there are a lot, and they include the downstream on this one)
44- Battery Temperature Sensor Volts Out Of Limit
23- IAT sensor problem (readings too high or too low)
55- End of the code reading process
Go to autozone, like wickedgoodneon said, and get the codes read so you can pin-point all of the problems correctly.
21- O2 sensor problem (there are a lot, and they include the downstream on this one)
44- Battery Temperature Sensor Volts Out Of Limit
23- IAT sensor problem (readings too high or too low)
55- End of the code reading process
Go to autozone, like wickedgoodneon said, and get the codes read so you can pin-point all of the problems correctly.
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Okay. So the CEL has been randomly coming on, but staying off most of the time. Also I took the car to the drag strip this weekend and with the warmer weather the car was up to normal operating temp and redline was 7400 rpm all day at the track. Car was running strong too. Strange I know and I appreciate your help.
1995 2dr Plymouth Neon SOHC MTX
Crane 14, nitrous oxide, race ported head, SAFC 2, few more extras.
Crane 14, nitrous oxide, race ported head, SAFC 2, few more extras.