O.K. it's not the wastegate rod...
02-02-2002, 04:04 PM
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O.K. it's not the wastegate rod...
...it's the ECU (as far as I can tell).
The rod checked out OK. I hooked up the VAG-COM and here is what I see. Any time the manifold pressure nears zero psi, the wastegate duty cycle goes from 0% to 99.6%. There are no intermediate duty cycle numbers - it's either 0% or 99.6%. In addition, my injector timing will not go above 7.61ms (compared to my old 16.32ms at WOT regardless of rpm or boost).
Is it possible that my ECU $hit the bed? I don't understand this one at all. Any help would be greatly appreciated.
Oh yeah, when I switched from Wett to GIAC, they didn't transfer my stock chip to a GIAC board and the Wett board won't even plug into the GIAC mount (pins are square instead of round). I wish I could plug the stock board in so if anyone is in CT and has a GIAC mounted stock ECU I can try I would be forever greatful - and yes I do have a bunch of beer to pay you back!
Thanks in advance,
Mike O.
The rod checked out OK. I hooked up the VAG-COM and here is what I see. Any time the manifold pressure nears zero psi, the wastegate duty cycle goes from 0% to 99.6%. There are no intermediate duty cycle numbers - it's either 0% or 99.6%. In addition, my injector timing will not go above 7.61ms (compared to my old 16.32ms at WOT regardless of rpm or boost).
Is it possible that my ECU $hit the bed? I don't understand this one at all. Any help would be greatly appreciated.
Oh yeah, when I switched from Wett to GIAC, they didn't transfer my stock chip to a GIAC board and the Wett board won't even plug into the GIAC mount (pins are square instead of round). I wish I could plug the stock board in so if anyone is in CT and has a GIAC mounted stock ECU I can try I would be forever greatful - and yes I do have a bunch of beer to pay you back!
Thanks in advance,
Mike O.
02-02-2002, 05:13 PM
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Tried unplugging the freq. valve but all it does is...
...trip a DTC. I think that valve is open unless is receives a signal (i.e., at 0% to close it all the way) as a safety feature.
I am really lost on this one.
Mike O.
I am really lost on this one.
Mike O.
02-02-2002, 08:32 PM
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Have you checked block 114?
Tells you req engine load and actual engine load, also shows you the wastegate dutycycle. If the load matches up then the MAF might be bad.
pulse width is based on MAF reading in open loop mode so if you're not running any boost and the MAF is ok then they'll open for a very short period of time. 16.33ms is the limit of the nondbw ECU. I'd say log 114 first and also get some logs of the MAF reading.
pulse width is based on MAF reading in open loop mode so if you're not running any boost and the MAF is ok then they'll open for a very short period of time. 16.33ms is the limit of the nondbw ECU. I'd say log 114 first and also get some logs of the MAF reading.
02-03-2002, 04:06 AM
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The load #s match but they are really low...
...and never get above 8. Do you really think that is what it is?
I'm going out right now to log 114, 2 and 3. I'll post results. Any way to check the MAF to see if that is the culprit?
Thanks,
Mike O.
I'm going out right now to log 114, 2 and 3. I'll post results. Any way to check the MAF to see if that is the culprit?
Thanks,
Mike O.
02-03-2002, 08:00 AM
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Re: The load #s match but they are really low...
hmmmm.. you remember what the load number is supposed to be? If you're sure it's low then I'd say either your ECU is stuck in limp mode for some reason or the ECU is fried. I dunno a way to check the MAF, the Bentley probably has a procedure.
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02-03-2002, 08:57 AM
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Your actual load is way lower than requested
I'll try to log that block later to see what it looks like. I have a dbw so it might be different. Now I think your MAF and ECU might be ok. could be the BFV.
02-03-2002, 09:18 AM
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I pulled the hose off of the wastegate to see...
...if it would produce boost and it didn't. I also just finished pulling the turbo off and both the wastegate and the turbine are fine so the turbo is 100% OK.
Here's what the Bentley says about DTC for boost pressure regulation:
Block 114:
Current engine load (display field 3) less than specified engine load (display field 2) and Duty Cycle (display field 4) close to 99%.
Possible Causes:
Wastegate bypass regulator valve - N75 - malfunctioning
Wiring to wastegate bypass regulator valve - N75 - malfunctioning
Wastegate in turbocharger stuck in open position
Leak between turbocharger and intake manifold
Turbocharger malfunctioning
The only one of these that I haven't competely exhausted is the leak between turbo and intake manifold but I am going outside to look at that right now.
Mike O.
Here's what the Bentley says about DTC for boost pressure regulation:
Block 114:
Current engine load (display field 3) less than specified engine load (display field 2) and Duty Cycle (display field 4) close to 99%.
Possible Causes:
Wastegate bypass regulator valve - N75 - malfunctioning
Wiring to wastegate bypass regulator valve - N75 - malfunctioning
Wastegate in turbocharger stuck in open position
Leak between turbocharger and intake manifold
Turbocharger malfunctioning
The only one of these that I haven't competely exhausted is the leak between turbo and intake manifold but I am going outside to look at that right now.
Mike O.