engine just turns over
Thread Starter
Racer
Joined: Dec 2006
Posts: 314
Likes: 0
From: Newport News Va
engine just turns over
Well like a idot today I went out to change the shift firmness in the tranny and low and behold all hell breaks loose. The reason I did this was I just had a new PCM put in and I liked the firmmer shift better. Now the engine just turns over and wont fire. I have checked codes and got one constant PCM= NO Comm. and a BCM U1255 HC. These are the only two that would not clear from the dic. I used a Motis scanner and could not communicte with the PCM . I have check every fuse possible. Even the one under the toe board. Now I have a dead car and I have no idea what it is. Can anyone help with this matter. I was using the Crane power tunner if that helps.
Safety Car
Joined: Aug 2000
Posts: 4,537
Likes: 84
From: St. Joseph MO
Cruise-In III Veteran
Cruise-In IV Veteran
Well like a idot today I went out to change the shift firmness in the tranny and low and behold all hell breaks loose. The reason I did this was I just had a new PCM put in and I liked the firmmer shift better. Now the engine just turns over and wont fire. I have checked codes and got one constant PCM= NO Comm. and a BCM U1255 HC. These are the only two that would not clear from the dic. I used a Motis scanner and could not communicte with the PCM . I have check every fuse possible. Even the one under the toe board. Now I have a dead car and I have no idea what it is. Can anyone help with this matter. I was using the Crane power tunner if that helps.
Pull the battery cable wait a day and try again. What did you use to change the shift firmness? Your scanner or some other means?
Instructor
Joined: Dec 2006
Posts: 226
Likes: 0
From: Newburgh NY
I've seen others have the same problem with a HyperTech tuner once in a while. In all cases, reflashing is ussually the fix. Sometimes you have to restore your original program with the handheld and then try to run your performance program.
If you have already done these and no help, disconnect the battery as suggested. If that still doesn't work, you may need a trip to a dealer to reflash it with a factory program.
If you have already done these and no help, disconnect the battery as suggested. If that still doesn't work, you may need a trip to a dealer to reflash it with a factory program.
Thread Starter
Racer
Joined: Dec 2006
Posts: 314
Likes: 0
From: Newport News Va
I was trying to set the firmmness with a Crane handheld programer and whlile doing this it went hay wire. I will try the battery idea today and see what happens. Thanks for the help.
