Truck wont start after header install?

Rice Eater said:
maybe the vec is freaking out?
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Thats what we are thinking and why Roe is getting a call first thing in the morning. If worst does come to worst, Roe is about 1 to 1 and half hours north of here and we can tow it, but that is a last ditch effort.
 
Doubt any error with the VEC3 would cause that CEL, more than likely the cam sensor is faulty or a loose wire.

You disconnected the negative terminal, the three connectors to the PCM and let it sit for 30 mins...then reconnect everything ?

You could also bypass the VEC3 with the connectors to take it out of the loop.
 
We tried taking out of the loop and it was still acting up. It seems like all signs point to the Cam position sensor. I will check that tomorrow. I did let the negitive terminal for 30 min but not the ecm. Where is the ecm (again, newb to DCX). Is it on the firewall on the pass side right behind the extra battery tray?

I checked the cam position sensor earlier and it was solidly connected to the water pump and harness. It led back to a main wiring harness (from what I remember). But again, I'll re-check that in the morning.
 
greg'sgoat said:
We tried taking out of the loop and it was still acting up. It seems like all signs point to the Cam position sensor. I will check that tomorrow. I did let the negitive terminal for 30 min but not the ecm. Where is the ecm (again, newb to DCX). Is it on the firewall on the pass side right behind the extra battery tray?

I checked the cam position sensor earlier and it was solidly connected to the water pump and harness. It led back to a main wiring harness (from what I remember). But again, I'll re-check that in the morning.
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Try a continuity test on the cam sensor wires as they might have been piched by the headers or original exhaust manifolds.
 
You can be sure that if any of the VEC II/III connections is bad that you will have trouble running the engine. The cam sensor is vulnerable when installing Mopar long tube headers...getting them in is an exercise full of frustration, everything can get hit in that install.

Does the owner have the VEC software installed in a laptop? If so you can connect it to the truck so that when Sean or Dave at Roe speak with you they can diagnose the problem.
 
Sounds like the VEC3 is a red herring, would look at getting the cam sensor replaced under warranty or order a new one if your dealer isnt going to help out.
 
Prof said:
He called me and he is working on his boss's truck...it is throwing an O2 code, but the boss has cut off the two back sensors...

He is going to call the owner and get another key.
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I would first reconnect the 2 rear O2 sensors without installing them, just cover them up with a air tight seal.
 
Westxsrt10 said:
I would first reconnect the 2 rear O2 sensors without installing them, just cover them up with a air tight seal.
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those codes will not cause it not to run
 
Well here is a little update. We worked on it today. It threw a code for the crank sensor and 02 sensor. Went under truck and checked the connections, pushed them as tight as we could and started it again. Lugged and stalled out again, but threw a cam sensor code. It is like the computer can't make up it's mind on what codes to throw and what it can't talk to. We looked at the cam sensor, everything is tight there and the harness couldn't have been hurt since it runs under the intake manifold. It is like we are chasing a random electrical gremlin and it keeps hoping to diffrent spots. It also smokes like hell for the few seconeds it stays running.

Is it possiable, since it keeps jumping between the cam sensor and the crank sensor, that it is somthing in the computer itself? If it is, then I have no clue why it smokes so much (from engine area and tail pipes). We are going to check all the wire connections to the ecm, make sure nothing came loose, but after that, I don't know what options we will have besides replacing sensors..
 
greg'sgoat said:
Well here is a little update. We worked on it today. It threw a code for the crank sensor and 02 sensor. Went under truck and checked the connections, pushed them as tight as we could and started it again. Lugged and stalled out again, but threw a cam sensor code. It is like the computer can't make up it's mind on what codes to throw and what it can't talk to. We looked at the cam sensor, everything is tight there and the harness couldn't have been hurt since it runs under the intake manifold. It is like we are chasing a random electrical gremlin and it keeps hoping to diffrent spots. It also smokes like hell for the few seconeds it stays running.

Is it possiable, since it keeps jumping between the cam sensor and the crank sensor, that it is somthing in the computer itself? If it is, then I have no clue why it smokes so much (from engine area and tail pipes). We are going to check all the wire connections to the ecm, make sure nothing came loose, but after that, I don't know what options we will have besides replacing sensors..
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Well.....the O2 sensor error would cause the PCM to richen up the A/F...I am surprised that the PCM would allow it to even fire with the cam or crank sensor error. If it did, the timing would be probably be all over the place. I would ignore the O2 sensor for now.....Crank and cam errors could be related in regards to error code generation (just a guess).

If you had a spare PCM, you could rule that out. If no loose, burnt, cut wires were found then would start with the cam sensor and move on from there.
 
greg'sgoat said:
Well here is a little update. We worked on it today. It threw a code for the crank sensor and 02 sensor. Went under truck and checked the connections, pushed them as tight as we could and started it again. Lugged and stalled out again, but threw a cam sensor code. It is like the computer can't make up it's mind on what codes to throw and what it can't talk to. We looked at the cam sensor, everything is tight there and the harness couldn't have been hurt since it runs under the intake manifold. It is like we are chasing a random electrical gremlin and it keeps hoping to diffrent spots. It also smokes like hell for the few seconeds it stays running.

Is it possiable, since it keeps jumping between the cam sensor and the crank sensor, that it is somthing in the computer itself? If it is, then I have no clue why it smokes so much (from engine area and tail pipes). We are going to check all the wire connections to the ecm, make sure nothing came loose, but after that, I don't know what options we will have besides replacing sensors..
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did the computer get wet.????
 
Computer did not get wet. I expected it to run rich as hell until the cmputer learned what was going on, that and no cats would do it, I just couldn't figure out why there was smoke from the engine. I think I am going to pick up a cam sensor if I can and try that. That is the re-occuring code in all this. It will throw a random crank sensor error. Does anyone know if I can get one locally (not through the dealer) and how much it will cost?
 
the cam sensor runs about 45.00 some dealer will charge more. where are you located and i can tell you who has this sensor.

part number is 5245084
 
greg'sgoat said:
Computer did not get wet. I expected it to run rich as hell until the cmputer learned what was going on, that and no cats would do it, I just couldn't figure out why there was smoke from the engine. I think I am going to pick up a cam sensor if I can and try that. That is the re-occuring code in all this. It will throw a random crank sensor error. Does anyone know if I can get one locally (not through the dealer) and how much it will cost?
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Did you installed O2 sims after removing the cats ? If not I would order a set today ;)
 
The rear 02 sensors have been turned off, so simulators shouldn't be needed (at least on my car they wern't). I am in Brevard county, Florida. My zip code is 32955.
 
greg'sgoat said:
Computer did not get wet. I expected it to run rich as hell until the cmputer learned what was going on, that and no cats would do it, I just couldn't figure out why there was smoke from the engine. I think I am going to pick up a cam sensor if I can and try that. That is the re-occuring code in all this. It will throw a random crank sensor error. Does anyone know if I can get one locally (not through the dealer) and how much it will cost?
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losing your cats will not cause it to run rich. air fuel is regulated by the upstream o2's the downstream o2's only function is to tell the pcm if the cat is efficient or not.
 
You never removed the VEC correct?

And you have been running the VEC prior to header's?
 
I'd bet the reason she's smokin is cause the exhaust is new. On every after market headers and catback I've put on it always smokes after the initial startup as the new metal gets hot. Should only smoke for 5 minutes or so. I think its some type of coating on that.
 
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