TW Chip question

[dhanna6powerstroke]

Ok, here's the scoop. I installed a TW 4 position chip in a friends truck, (2000 F-350 6 speed). After installing, we checked that all positions worked and they did. This was on a Friday evening. He left Saturday morning and drove 180 miles to Kentucky pulling a 35 ft. gooseneck with 2 Jeeps. Drove home Sunday and everything was still working great. Sunday night he got in the truck to leave and the "check engine light" came on and stayed on and the truck would not start. He cycled the key a few times and got it to start. Did this again Monday and then yesterday. I had him remove the computer and check the connection terminals. He recleaned them and reinstalled the chip. The truck started, he switch through all the positions and then back, shut the truck off and it would not restart. He removed the computer again and rechecked, reinstalled and the same thing happened. Removed again, reinstalled and never could get it to start. Completely removed the chip and reinstalled the computer and it starts and runs great. Anybody have any ideas? I've seen where they wouldn't start at all because of a bad connection but never seen one do this. Any help is greatly appreciated and sorry for the novel of a post.

[Diesel Monkey]

Take a look at the large external connector, see if it is clean or has corrosion.

[dusted4eva]

I'm new the chips but it may need a reburn. could be a faulty tune.

[dhanna6powerstroke]

Originally Posted by Diesel Monkey

Take a look at the large external connector, see if it is clean or has corrosion.

Ok, but would it run with the chip removed? Absolutely no problems before the install. Thanks for the suggestion.

Originally Posted by dusted4eva

I'm new the chips but it may need a reburn. could be a faulty tune.

Thought about that too but doesn't make sense that it worked great for 3 days. Anything is possible I guess. Thanks for the suggestion.

[dhanna6powerstroke]

[rooney77]

Is it possible that if the original installation had a bad connection that it could have possibly shorted the chip? That's the only thing I could think of. Unless the PCM has another program on it, other than stock, from a previous owner.

[Dirk]

Pull the pcm and take pics of the contacts. May have screwed up the install.

[dhanna6powerstroke]

Originally Posted by rooney77

Is it possible that if the original installation had a bad connection that it could have possibly shorted the chip? That's the only thing I could think of. Unless the PCM has another program on it, other than stock, from a previous owner.

There has never been a program in the truck before. I suppose it is possible that a bad connection could have shorted it?

Originally Posted by Dirk

Pull the pcm and take pics of the contacts. May have screwed up the install.

I will have him do that. Thanks for the input. BTW, I shipped that gauge today.

[Drepka]

I know the connections in the Computer are covered by a clear type ,gummy film, when Tony installed my chip he told me you had to scrape it off REAL thorough or else it would have bad connection. He did it with a pocket knife and he did it alot.

[Dirk]

Originally Posted by Drepka

I know the connections in the Computer are covered by a clear type ,gummy film, when Tony installed my chip he told me you had to scrape it off REAL thorough or else it would have bad connection. He did it with a pocket knife and he did it alot.

true, but too much will ruin the pcm. Or at least... you'll have to repair the contacts.