1.9 Pd Auy Engine, Starting Issues.

[1969ghia]

Sometimes, the car will start on the first turn of the key, almost instantaneously but if it doesnt catch first time, it can be a right royal PITA to start.

 

Any ideas where to start trouble shooting this? I was going to check how long the plugs were energised for on a cold start and go from there. I assume there is a glow plug relay somewhere and also temp sensors that would control the time.

 

I wondered about disconnecting the temp sensors to give a false 'cold' reading to see if that helped. I realise as its a PD engine, the plugs shouldnt really be an issue in this weather.

 

Normally on a warm engine it would start first flick of the key but yesterday it took an age...thats why I started to wonder about the temp sensors.

 

Also, have noticed the LED in the door seems to act differently when we have these problems. Is it possible the immobiliser is coming in to play?

 

Have replaced all the glow plugs and the battery.

Engine turns over but just doesnt want to fire.

[chrispb123456]

Have a read here regarding relay 109 and vagcom reading engine electrics

 

 

 

http://www.tdiclub.com/TDIFAQ/TDiFAQ-8.html

Edited April 28, 2011 by chrispb123456

[1969ghia]

Have a read here regarding relay 109 and vagcom reading engine electrics

 

 

 

http://www.tdiclub.com/TDIFAQ/TDiFAQ-8.html

 

 

Chris, thanks for the link. All my tests came out good. The only issue I had was with checking the timing. I opened VagCom and went in to engine then measuring block 4 but I couldnt find actual timing, specified timing and advance solenoid %, I had something to do with the injectors but not what I was expecting. Did I go in to wrong section?

[chrispb123456]

Hi

 

The measuring block your looking for is for timing an injection pump, thats not relevent to your engine you have a PD engine and have unit injectors with a high pressure supply pump and an electric in tank pump.

You have all classic signs of 109 intermittant failure, sometimes you can get away with soldering dry joints but there not expensive stick a new one in problem solved

[1969ghia]

Hi

 

The measuring block your looking for is for timing an injection pump, thats not relevent to your engine you have a PD engine and have unit injectors with a high pressure supply pump and an electric in tank pump.

You have all classic signs of 109 intermittant failure, sometimes you can get away with soldering dry joints but there not expensive stick a new one in problem solved

 

 

Sweet, thanks for the info!

[1969ghia]

Well its not the relay so am guessing at fuel in the lines.

Will try the T piece on top of the air filter first, then its on to more expensive stuff.

Will also verify that the fuel pump in the tank is operating every time.

 

Poor start video.

http://www.youtube.com/watch?v=GOq97JSWhwI

Edited May 1, 2011 by 1969ghia

[1969ghia]

OK, looks like we have some progress.

Didnt have the squelch sound from the in tank pump and was a pain to start!

 

So, how do I access the pump and its connection and is there an output test I can perfom using VagCom so that I can check the wiring and supply?

I assume it is only energised on intial start up and after that the engine pulls the fuel through or does it run all the time?

TIA.

[chrispb123456]

Pumps accessed from under middle row of seats, theres a round access plate in the floor.

Would imagine its continuous when engines running but not 100% sure, relay 53 (pump relay) near the 109 relay which may also be faulty (not sticking my neck out this time) :unsure:

Don't know about output tests on pump, think you would need registered version for that.

[1969ghia]

Pumps accessed from under middle row of seats, theres a round access plate in the floor.

Would imagine its continuous when engines running but not 100% sure, relay 53 (pump relay) near the 109 relay which may also be faulty (not sticking my neck out this time) :unsure:

Don't know about output tests on pump, think you would need registered version for that.

 

Cheers for that Chris, will check it out as soon as I get a mo. Will let you know my findings.