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Negative Chip effects

andymorris

andymorris

New member
Has anyone suffered any negative affects after fitting a chip ?
I ask the question as I am trying to get to the bottom of a loss of power issue Im having which is relatively intermittent. (It was suggested by a mechanic that it could ???)
 
The only negative effect i've experienced is a reduction in fuel economy as off-the-shelf chips are usually mapped on the rich side for safety. Other than that i've not had any other problems.

The only other downside that in threory shouldn't cause you any problems is that with aftermarket chips you loose knock protection (certainly on turbos at least). Only the SciVision chips that work with the SciVision MAFs retain full knock protection as far as i'm aware. Shouldn't be a problem if your engine is working fine and nothing goes wrong.
 
ORIGINAL: andymorris

Has anyone suffered any negative affects after fitting a chip ?
I ask the question as I am trying to get to the bottom of a loss of power issue Im having which is relatively intermittent. (It was suggested by a mechanic that it could ???)
Click to expand...


Hi Andy,

Chips (EPROMS) are just small amounts of binary lookup data. If a chip has corrupt data on it, it is very likely to stop the engine functioning. It is very unlikely to give you an intermittent problem.

What chip do you have fitted? If you have an aftermarket one - just put the original back in to see if the problem clears. This will at best elimiate the problem, or at worst eliminate the chip as the source.

A full electronic fault diagnosis with a test meter should help you identify the source of the problem (it could be ECU, cold start sender or ISV related - could be fuel related, such as FPR, pump or return)

Regards,
Andrew
 
I would try swapping your DME relay. Quick to do, cheap (£20 ish) and a common source of intermittant power loss.
 
Andrew - Sorry for the possible negative ad but its a promax chip. The intermittent problem didnt start when the chip was fitted so I didnt think it would be, but I thought I would ask the question anyway. In fact when the chip was fitted it had alot of positive affects.

Graeme I tried a new DME aswell.

Regards
Andy


 
Hi Andy,

No problem - the first place to look is any recent changes made to the car.

As the problem is intermittent, it is likely to be electrical (not 100%) - hence, a logical approach at diagnosis is required.

I would start with all the obvious things first (Dis cap, rotor, plugs etc.) and make sure your connections from the flywheel sender are sound too.

Good luck.

Regards,
Andrew
 
It's not unknown for the board or ribbon cable to get damaged changing chips. A bad connection there could cause issues and will slowly deteriorate until it stops working all together.
 
Thanks for the advice guys, It must be something electrical. Just hope I get to the bottom of it before next saturday [8|]
 
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