Crank interrupt then PCM resets
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02-23-2015, 09:49 PM
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Crank interrupt then PCM resets
I'm a new member to this forum so if I'm breaking the rules by doing this please let me know. My question is regarding the Magnum but there's not a whole lot of people in that group and my problem is more generic . . .
I purchased a 2006 Magnum R/T with 112000 miles. First off, the Magnum runs fantastic once it starts. No issues of any kind that I can find.
Here's the needle in a hay stack - meaning this is a sporadic issue, not constant.
I am experiencing a crank-no-start issue with odd symptoms. I turn the key 2 clicks to allow the pump to prime (out of habit). I turn the key and the engine starts to crank. I will get 1 or 2 revolutions and then I get an interrupt in the crank. All of my dash lights stay on. The only thing that stops is the cranking. Then it starts cranking again. Sometimes the engine immediately fires after that delay, sometimes it needs to crank 3-5 times - sometimes the interrupt comes back. Eventually fires up. I could then shut the car off, turn the key and fire up immediately. Here's the really weird thing about all of this - when I experience the stutter in the crank my PCM resets. Therefore my emissions cycle never completes and now I can't get my car e-checked.
My first inclination is battery. I'm in Ohio and this problem has become daily in these negative temps we are having. This feels temperature related but not necessarily engine temp related. I have had this stutter/PCM reset after having the car off for minutes. I measured my battery and she has a solid 12.6+. I measured while cranking (but couldn't replicate the stutter) and volts jump up when she's running. I don't think it's necessarily a voltage issue but I don't know much about cold crank amperage, etc.
The car has a new starter. I'm not throwing any codes either. I swapped out the starter relay but no change.
I'm looking to see if anyone out there has either had this experience or might suggest some places to look. The only way I know of for the PMC to reset is by sending a code or disconnecting the battery. This being the case I have to believe I'm somehow losing power to the PCM. I suspect that this interruption in power to the PCM results in a no-start. By the way, I see the loss of PCM because I have a Torque reader plugged in.
Taking to the shop this week but want to see if anyone can beat them to the punch!
Thanks.
I purchased a 2006 Magnum R/T with 112000 miles. First off, the Magnum runs fantastic once it starts. No issues of any kind that I can find.
Here's the needle in a hay stack - meaning this is a sporadic issue, not constant.
I am experiencing a crank-no-start issue with odd symptoms. I turn the key 2 clicks to allow the pump to prime (out of habit). I turn the key and the engine starts to crank. I will get 1 or 2 revolutions and then I get an interrupt in the crank. All of my dash lights stay on. The only thing that stops is the cranking. Then it starts cranking again. Sometimes the engine immediately fires after that delay, sometimes it needs to crank 3-5 times - sometimes the interrupt comes back. Eventually fires up. I could then shut the car off, turn the key and fire up immediately. Here's the really weird thing about all of this - when I experience the stutter in the crank my PCM resets. Therefore my emissions cycle never completes and now I can't get my car e-checked.
My first inclination is battery. I'm in Ohio and this problem has become daily in these negative temps we are having. This feels temperature related but not necessarily engine temp related. I have had this stutter/PCM reset after having the car off for minutes. I measured my battery and she has a solid 12.6+. I measured while cranking (but couldn't replicate the stutter) and volts jump up when she's running. I don't think it's necessarily a voltage issue but I don't know much about cold crank amperage, etc.
The car has a new starter. I'm not throwing any codes either. I swapped out the starter relay but no change.
I'm looking to see if anyone out there has either had this experience or might suggest some places to look. The only way I know of for the PMC to reset is by sending a code or disconnecting the battery. This being the case I have to believe I'm somehow losing power to the PCM. I suspect that this interruption in power to the PCM results in a no-start. By the way, I see the loss of PCM because I have a Torque reader plugged in.
Taking to the shop this week but want to see if anyone can beat them to the punch!
Thanks.
