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a freind of mine works at a gm dealer and said that before any major engine work is done ie injectors, pumps etc, a snapshot has to be taken of the vehicles computer and sent in before any work can be authorized. they can tell by numbers in the programming history if the vehicle has been reflashed with any aftermarket devices, and if so that the warranty is null and void..

can they do this?is there any way around it?
 

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CRAZY CANUCK
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a freind of mine works at a gm dealer and said that before any major engine work is done ie injectors, pumps etc, a snapshot has to be taken of the vehicles computer and sent in before any work can be authorized. they can tell by numbers in the programming history if the vehicle has been reflashed with any aftermarket devices, and if so that the warranty is null and void..

can they do this?is there any way around it?
yes they can do exactly what you said, they log the ecm and and can tell a lot of things about your engine, is anything seems to be out of place, like values such as fuel injected, injection timing that are beyond stock values means that you have modified the ecm programming

the easiest way around it is to have an extra ECM that you have run on your truck for a period of time, and replace the tuned ECM with the stock ecm:rock
 

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Gone Fishin...
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Some programmers dont leave a trace on the ECM. Banks for instance, intercepts the signal and sends a different one to the pump. The ECM doesnt even know its there.
 

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CRAZY CANUCK
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that may be but if more fuel is being injected than the engine wont be operating within stock parameters, there will be traces left in the ecm
 

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that may be but if more fuel is being injected than the engine wont be operating within stock parameters, there will be traces left in the ecm
x2

A very good friend of mine is an extremely knowledgeable service tech and was explaining exactly this to me. He doesn't care what I do to my truck and will warranty anything that he knows the programmer wouldn't cause, but did say if I blow the motor I'd be out of luck, lol.
 

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x2

A very good friend of mine is an extremely knowledgeable service tech and was explaining exactly this to me. He doesn't care what I do to my truck and will warranty anything that he knows the programmer wouldn't cause, but did say if I blow the motor I'd be out of luck, lol.
That sounds fair enough to me.
 

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When a programmer (a downloader) is used it changes values when it does this to any given parameter it moves a number called a tattle tale up one valve for every time the value is changed on a system like a banks it looks at the percent of average engine load and compares that against total fuel used if the math doesn’t work neither do the mechanics
 

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Every thing leaves a trace, but you can erase everything...too.
 
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dieselgeezer
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There are some things that cannot be erased. Inside the cylinders are small marks that look like burn marks built into the cylinder walls. When an engine is tuned, or otherwise modified to exceed the designed horsepower parameters of the Dmax, these marks are changed or missing when the engine is disassembled which is a requirement for internal warranty repairs. Don't be surprised if a warranty claim is denied. Abuse is costing GM millions of dollars in warranty fraud for customer claims due to damage from power enhancing tunes and after market go-faster parts. Between the physical markers and electronic ECM memory, there is virtually no way GM can't tell the customer has played with the vehicle and they will deny warranty coverage. You want to play, expect to pay!
 
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