Couldn't resist

[beale187]

Filter sounds like it was pretty nasty. D/c the battery will reset the ECU but it won't clear any fault codes. Probably couldn't hurt to clean the MAF and run some injector cleaner through as well or a tank or 2 of 98. Not sure if it's a case of how long or how many kms I think it's more to with certain driving conditions being met. Eg, cold start, 1/2 throttle, WOT, xx km p/hr for xx mins etc... there's a check list floating around somewhere

[sports racer]

I've started to pull it apart to fix things. This is to get the right headlight out so I could reconnected the adjustment mechanism. The stick is there to hold the bonnet because it was very windy and just before this picture was taken the bonnet slammed down on my hand.



I've done 300ks with the injector cleaner and disconnected the battery for a couple of hours and then reconnecting and leaving the ignition on for 30 min but I still have a problem with the throttle. It feels like the throttle body isn't opening up all the way and I still have the EPC warning light constantly on. I think it's time to get an ELM327 OBD2 scanner so I can clear the codes and find out what's making the EPC light come on.

[sports racer]

I scanned it and get the following 4 fault codes 1) P1630 2) P3211 3) P3212 4) P1426 and 1 pending code - P0102.

Are these descriptions correct and how do I fix them?

P1630 - Accelerator pedal position sensor low input
P3211 - Oxygen (Lambda) sensor B1 S1 Heater return coupling
P3212 - Crankshaft position sensor A circuit low input
P1426 - Tank ventilation valve open circuit
P0102 - MAF sensor circuit low voltage

Some more info. When I disconnect the MAF sensor it makes no difference to the running of the engine - it doesn't idle differently or run rough.

I took off the intake pipe to see what the throttle butterfly valve was doing. With the engine idling then pushing the pedal to the floor it opens all the way for a fraction of a second then closes so it's almost shut. If I keep the pedal to the floor it revs to 5200 and goes no further.

With a bit of luck cleaning or replacing the accelerator sensor will give me the acceleration I'm missing. Then I'll see if the other faults come back when I scan it after that.

Cheers

Paul

[Bora Sport]

With all those other potential faults, the MAF test probably isn't valid.

Also sometimes one fault will cause another. For example is the mixture isn't right you might end up with an oxygen sensor fault.

[sports racer]

Yeah, I'm finding that out the hard way. Took the accelerator pedal off (major hassle because of the water protection cover) and cleaned the contacts. Made no difference so tried one off an Audi which behaved exactly the same.

Got the sh*ts so put on the towbar. Much easier to do.

[beale187]

Hate electrical problems

RE: P1426 - Tank ventilation valve open circuit

Solenoid stuck open? Check the connector to the purge valve on top of the charcoal cannister? You should also hear a clicking sound as it open/closes to let the fuel vapors into the intake if it is working correctly.

[grtuned]

Replace the air flow meter


Sent from my iPhone using Tapatalk

[sports racer]

Why would the MAF be the problem when the issue is the car has no power over 2500 rpm because the throttle isn't opening all the way? Does the MAF stop the throttle position sensor opening?

I had to drive to Wagga yesterday to pick up my daughter's scooter. On the way there I averaged 11.1 litres, coming back with the scooter it got 11.0 and felt slightly better to drive. Normally I'd say the long drive (7 hours) cleaned out a few things but I drive over an hour each day (and 100 ks) to get to work so there shouldn't be any stop/start gunk in the engine.

The car was beautiful to drive despite the lack of power going up hills and having the trailer/scooter on the back made no difference to how it performed. It still slows down to 90 k's on the big hills, trailer or no trailer but doesn't get any slower and cruises at 110.



Next step is to check the voltage going to the accelerator and to the throttle. Might even run 5v direct to the throttle to see if that clears out some cobwebs.

Does anyone know where I can download a wiring diagram?

Paul

[feenix74]

From ERWIN? Guided search < Volkswagen AG erWin Online

[sports racer]

Looks like they charge for the service. I'm looking for something free.

[beale187]

Looks like they charge for the service. I'm looking for something free.

Engine code please

[sports racer]

Bde002485

[beale187]

[beale187]

How's that? pm me if it didn't come through

[sports racer]

It came through fine. Now I just need to work out which bit isn't getting the full 5v to the throttle position sensor.

Thanks.