So here's a weird situation, I took my truck in to a shop for a new set of UVCH wire harnesses and a fuel pump.

The mechanic is telling me that my chip is bad and causes the truck to run real rough when it's plugged in but when he unplugs it, it runs fine.

I've had the chip for a year now and I haven't picked the truck up to see for myself yet.

Have you guys ever heard of this? I tried looking up this situation and it seems I'm the only one.

 

Oh I forgot, my truck is an Automatic late 99 F350 7.3l 4x4

 

if it is loss it can make it run bad.

 

I think Matt meant loose.

If it has been running fine before the work was done, I highly doubt the chip is somehow causing it to run rough unless, like Matt has already stated, it has come loose from the PCM. A new fuel pump and UVCH's should not change anything with regards to the way the chip performs.

 

thanks for the correction, that is what i meant. i just cant spell

 

Maybe the lands on the pc was marginal and now the chip isn't making a good connection. Take it out and tin the lands...should be good to go, heh?!

 

sorry for taking so long to respond, I hate when people do that. But I plugged in my chip and it ran perfectly. This guy obviously didnt know what he was saying. even 2 months of driving still fine. I think what had happened what he saw a check engine light and didnt know what it was so he blamed it on my tuner. Turns out I need a new ipc sensor -__- time to dish out $200 bucks lol

 

I think the previous advice is spot-on.

What your mechanic is telling you is probably what he thought was his findings. I don't think he's intentionally deceiving you.

When someone brings be a vehicle and tells me their issues are idle or rough acceleration or deceleration issues the first thing I tell them is to remove the Chip, test it out and bring it back if it's still doing it. Because you're going to pay me $100 an Hour to do it for you.

If they bring it back and it has a problem I diagnose it. If the customer tells me everything miraculously cleared up, I tell them to check the connection on the chip and PCM and/or call the manufacturer for troubleshooting.

So, it could well have been a loose connection or some foreign corrosion on one or both pieces. These trucks bounce like steel *****. They absorb all sorts of energy by the nature of the suspension.

Most probably the cause, [Chip] was prepped for installation and end user scrubbed all the tin off the PCM leaving bare copper which has been thinned by the scrubbing thereby creating an intermittent or continuous drivability problems.

Re-tinning the PCM can accomplished with a little flux for cleaning and electronics graded solder.