Throttle body modification

[RobDon]

It's worse with the modified TB, new gasket yes, hoses ok. When I do a TB alignment in VAG-COM it shown two angles, usually around 14% and 82%, the test always comes up ok, no errors. It idles and runs better on the old TB but still dies and misfires on mid-throttle.

2 fault codes were manifold/boost signal too high and implausible signal as well.

It's crazy as it drove normal - didn't use the car for a couple of weeks, stuck the new TB on and now it doesn't run, even with the old TB as well, never touched anything while it was off the road!

 

[Feel]

It's worse with the modified TB, new gasket yes, hoses ok. When I do a TB alignment in VAG-COM it shown two angles, usually around 14% and 82%, the test always comes up ok, no errors. It idles and runs better on the old TB but still dies and misfires on mid-throttle.

2 fault codes were manifold/boost signal too high and implausible signal as well.

Disturbed the MAP sensor/wires?

 

[DPJ]

It's worse with the modified TB, new gasket yes, hoses ok. When I do a TB alignment in VAG-COM it shown two angles, usually around 14% and 82%, the test always comes up ok, no errors. It idles and runs better on the old TB but still dies and misfires on mid-throttle.

2 fault codes were manifold/boost signal too high and implausible signal as well.

Have you tried logging boost to see if you get a reading of some sort, Rob?

Broken wire to MAP sensor?

 

[RobDon]

I'll go and check the MAP sensor wires now, I did have the MAP sensor pipe off recently!

 

[ibizacupra]

2 fault codes were manifold/boost signal too high and implausible signal as well.

thats more information crept out Rob..
as dave says.. whats the map sensor reading? has it been disturbed when removing the t'bodies?

 

[RobDon]

Wires are all intact to the MAP sensor, maybe the MAP sensor itself it kaput?

 

[Feel]

Hmmm, they're fairly robust. I have a spare one that I beleive to be working - you can have it for postage.

PM me your address.

 

[RobDon]

Many thanks! Could the accelerator pedal itself be at fault (TPS)?

 

[ibizacupra]

for 1st time seen this pedal come up with fault only last week on an lcr. implausable signal error. replace and its not reoccured. did'nt misfire tho, just drove really slow like limp

 

[ibizacupra]

log MAP and you will see whats going on during the misfiring..

 

[RobDon]

I found the test for the pedal, block 062, has 4 different percentages which all change as you push the pedal up and down. No idea what I'm looking at though - what should be normal?

Never saw anything that said 0 or 100% though?

I'm getting the implausible signal fault too Bill. Do you know the part number for the module that needs replacing?

 

[ibizacupra]

not sure if LC is same as LCR pedal..
one of the earlier blocks 002,003 etc have the 0-100% bit.. you could do with someone on pedal opening and another looking at the throttle actually opening to confirm 100% is actually open and no stuttering along the way.

 

[RobDon]

Will check that out then. Reason I'm more convinced it's the pedal electrics is because when I removed the Sprintbooster module the problem was far less. If the module is amplifying the pedal signals then perhaps that's why it seems much worse?

Has the Sprintbooster damaged the pedal electronics?

 

[DPJ]

.......If the module is amplifying the pedal signals then perhaps that's why it seems much worse?

Has the Sprintbooster damaged the pedal electronics?

Not that I've got one, but I'd doubt it. It just seems strange that the problem started when you removed your TB, Rob - it would be a huge coincidence if your pedal started playing up at the same time.

I'd see what sort of reading you get on vag-com for boost.

On other thing that occurred to me, is there something odd about the way your cold side DV has been reconnected, pehaps?

 

[RobDon]

Cold side has been connected that way for some time now and been fine. Car won't boost on mid throttle, it dies like there is zero from the pedal.

Seems a huge coincidence yes, but I've tried 2 different TB's, different coilpacks, unplugging the MAF, changing vacuum lines, etc. and the problem remains. The only way the problem is reduced is by removing the sprintbooster module, so it has to be the pedal right?

 

[DPJ]

.........The only way the problem is reduced is by removing the sprintbooster module, so it has to be the pedal right?

I see what you're saying, but the effect of the sprintbooster is to alter the signal coming from the pedal - so it could still be another component -performing differently as a result of the different sets of signals.

 

[RobDon]

Like what?

 

[DPJ]

I'm thinking hard!

I keep coming back to the MAP related fault.... trying to work out under what circumstance it would throw the fault codes.......

 

[RobDon]

Once TJ get back to me with the part numbers and prices for the pedal sensors, I'm going to replace them and remove the sprintbooster, hopefully that will be it fixed.

 

[RobDon]

Tristan @ TedJ say £53.10 + VAT for the complete accelerator pedal including the sensors, so I just spoke to him and ordered one, should hopefully have it in about 3 days time - then we'll find out if that is the problem!!!