Can a Remap go faulty?

[lee25]

Hi all,
Ive had no end of running problems with my mk1 LC, Over boosting, not boosting enough, idling poor, loss of power, etc etc.
Now i had it in at the seat garage and vagcom came up nothing. The guys there couldnt determine the fault and suggested it could be a fult with the ecu as its over fuelling, I had the car remapped last year, and other than that is standard except a green panel filter and forge dv, im wondering if the Map could of somehow gone faulty causing the issues with fuelling??

 

[andycupra]

check all hoses for cracks or splits.

you could also run it with the maf unplugged to see if this is playing up or not as this can cause issues and may not show a fault code.

(this is the sensor imediately after the air box.. traction control light will illuminate on the dash and you wont have traction control. but if the car runs ok with it unplugged (it will use other data~) then this would point to a maf issue.
Easy to try.

however it really could be a number of things.

 

[GlanzaV]

I think out of everything the ECU is probably the last thing that would go wrong - Though it does sit under the scuttle panel so could have water ingress.

 

[ibizacupra]

maps wont go faulty no

components on engine and pipes splitting are muchos common these days

 

[lee25]

runs just as sh*t with the MAF unplugged, its had 2 new MAF's and no change, vagcom reads Low voltage to MAF

 

[Cowie]

runs just as sh*t with the MAF unplugged, its had 2 new MAF's and no change, vagcom reads Low voltage to MAF

Could that not be a possible broken or loose/faulty wire to the maf sensor?

Has that been checked mate?

 

[andycupra]

runs just as sh*t with the MAF unplugged, its had 2 new MAF's and no change, vagcom reads Low voltage to MAF

is that low voltage with the maf connected?

i thought there was no error codes?

sounds like a potential wiring issue?

 

[lee25]

Could that not be a possible broken or loose/faulty wire to the maf sensor?

Has that been checked mate?

Yeh ive checked the wires mate but cant find anything. nothing visual anyway.

 

[lee25]

is that low voltage with the maf connected?

i thought there was no error codes?

sounds like a potential wiring issue?

Yeh thats with the maf connected, that was the only code but the mechanic seemed to think it had nothing to do with the running issues

 

[lee25]

Im taking it down to rs tuning at leeds on thursday for a run and fault diagnosis on the rolling road so hopefully that will shed some light.
Ive had it into 3 garages now, all supposed to be reputable VAG specialist and they just seem to fob me off that they dont know whats wrong with it, but its really affecting the way it drives and im only using the car as i have no other means of getting to work