starting issue
Posted
#987136
(In Topic #116982)
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starting issue
i have been playing about with the air box today and moved the diafram plunger up and down and got fuel coming out so i did this while trying to start the car and it fired up and ran for 2 mins at idle no problem the coughed and spluttered and cut out but i cant get it to start again now any suggestions would be great guys thanks
its not a problem just a challenge ?
Posted
Local Hero
Posted
Settling In
its not a problem just a challenge ?
Posted
Local Hero
The metering head air flap probably isn't set correctly, and the mixture out too, but these are running issues rather than starting issues.
Or are you saying the car didn't start hot, then you fiddled with the metering head, then it started hot? If so then it will be a change in the mixture which did it. But then are you also saying it now doesn't start again?
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if that makes sense
its not a problem just a challenge ?
Posted
Local Hero
Cold starts - check the 5th injector is firing - even with no fuel from the mechanical injectors, it would start and run for a few seconds if the 5th injector is doing its job properly.
Hot starts - correct operation of the metering head, and having proper system pressure, is much more critical - check the flap is centralised and sitting at the right level, that the WUR is working properly (will need a pressure gauge for this) and that the mixture is set properly (will need a gas analyser to properly do this).
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Settling In
its not a problem just a challenge ?
Posted
Settling In
its not a problem just a challenge ?
Posted
Local Hero
Posted
Settling In
the fuel pump is priming and fuel to the metering head and the wur and the 5th injector but it delivers no fuel im begining to get really annoyed now with the car grrrrrr
update:- been messing about with the car a bit more today and when i manually operate the flap the car delivers fuel but does not start got a bit of back pressure into the air box , i have tried with and without air-filter all components that require power have power as i tested them with circuit tester the flap is central and it sits flush with the bottom of the bowl ( is this correct )
i have also tried another metering head from a 16 valve that i know is working but not sure if they do the same job but car wouldnt start any way
its not a problem just a challenge ?
Posted
MOTY 2013
if once all that working and it still wont start, replace the fuel filter. I had a blocked filter on my 16v and it had similar symptoms, car would get fuel to metering head but nothing out of the injectors
Hello my name is John and I'm a dub addict.
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Posted
Settling In
car is always stone cold as it will not run
its not a problem just a challenge ?
Posted
MOTY 2013
to check for continuity you need a multimeter, set it so it shows a 1 and goes to 0 when the probes are touched, or the beep setting if it has one
put 1 end at the green/white wire at the thermoswitch, and the other at the green/white wire at the 5th injector. this wire should make the multimeter beep/go to 0. Do the same test between the black wires at the starter motor and the black wire pin at the thermoswitch.
Next put 1 probe at the pin of the thermoswitch where the green/white wire goes, and the other at the battery -ve. this should also make the multimter beep/go to 0.
Next set the multimeter to measure voltage, and put the red probe to the black wire on the thermoswitch and the other to battery -ve. Get someone to crank the engine, and you should see 12v.
Hello my name is John and I'm a dub addict.
My wiring diagrams and other documents have moved here:
VAG Documents & Downloads
You'll need to sign into google/gmail for the link to work! (its free!)
My wiring diagrams and other documents have moved here:
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Posted
Settling In
on the 2nd part of the test the thermo time switch is red and black so i assume this is what you meant when i tested this it does not drop down to zero ???
if you meant the black wire on the 5th injector this drops to zero as above
part 3 checking green /white wire to batt neg the meter still reads 1 ??
part 4 when you check for voltage i get around 9 volts any ideas on the above thanks
its not a problem just a challenge ?
Posted
MOTY 2013
part 3 I meant the actual pin on the thermoswitch, not the plug itself. you're checking the green/white wire pin passes current to ground when the switch is cold. if not it needs to be replaced.
9volts could be about right, after all there is quite a load on the starter motor while the engine is cranking?
a quick n dirty way to check the 5th inj is to take it out as you did above, and run the green/white wire from thermostwitch direct to ground. then point it into a buckety and crank the engine, it should then spray fuel. if it does you can be pretty certain the problem is down to the thermoswitch, or the earthing path thru the block to ground.
if it still doesnt work maybe its the 9v you are seeing at the black wire isnt enough, to confirm jump the 5th inj pins direct to the battery whilst the fuel pump relay is bridged, if it sprays fuel then you know its ok.
oh and of course extreme care should be taken whilst messing with electrics and fuel!
Hello my name is John and I'm a dub addict.
My wiring diagrams and other documents have moved here:
VAG Documents & Downloads
You'll need to sign into google/gmail for the link to work! (its free!)
My wiring diagrams and other documents have moved here:
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You'll need to sign into google/gmail for the link to work! (its free!)
Posted
Settling In
its not a problem just a challenge ?
Posted
MOTY 2013
Hello my name is John and I'm a dub addict.
My wiring diagrams and other documents have moved here:
VAG Documents & Downloads
You'll need to sign into google/gmail for the link to work! (its free!)
My wiring diagrams and other documents have moved here:
VAG Documents & Downloads
You'll need to sign into google/gmail for the link to work! (its free!)
Posted
Settling In
its not a problem just a challenge ?
Posted
MOTY 2013
take the rocker cover off and verify that when the crank and cam marks are lined up to TDC that the cam lobes on #1 look like this- |\ /|
also make sure the rotor arm is pointing at the notch oin the outer edge of the dizzy, and that spark plug lead #1 is fitted where the arm is pointing. firing order is 1342 clockwise
Hello my name is John and I'm a dub addict.
My wiring diagrams and other documents have moved here:
VAG Documents & Downloads
You'll need to sign into google/gmail for the link to work! (its free!)
My wiring diagrams and other documents have moved here:
VAG Documents & Downloads
You'll need to sign into google/gmail for the link to work! (its free!)
Posted
Settling In
its not a problem just a challenge ?
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