Golf 8v K-jet engine won't start

[Chris1276]

Golf gti 1.8 8v K-jet won't start and if it does it stalls. We have checked the timing, have a spark at the plugs, have fuel getting to the spark plugs from the injectors after having fuel issues and it now seems the fuel is not igniting. When it did run it wouldn't idle & stalled. Have checked the cold start valve, thermometer and timing all of which is ok. Idle air valve could be an issue which I am going to check tomorrow but I cannot understand why the fuel isn't igniting when it is fresh new fuel. Air to fuel mixture could also be a problem as it seems to be soaked in fuel at the spark plugs, flooded with fuel.

I have had so many problems I feel like giving in!!! Metering unit is fine, fuel pump & lifter is running. If the idle air valve is broke or not earthed properly could this be the cause???

[bodga]

If you take the big boot off the metering head and lift the metal disk, (using the nut in the middle), is there any resistance as you lift or is easy to lift?

Like this guy is doing in this vid: http://www.youtube.com/watch?v=XabbJ3HaeuI&feature=related


If its easy to lift, the needle is probably stuck in the metering head and it could be flooding your cylinders with fuel, also any air leaks between the meter head and throttle body will give greif

the ISV should constantly buzz when you turn the ign on.

[Chris1276]

My money is on the air leaks as the metering unit works fine and I have the buzz when turning the ignition on. Will try and sort it out tomorrow. Thanks

[Chris1276]

Still no joy so I am going to take the metering head off next and see if the pin is stuck which pushes the diaphram up and down in the head. Engine is over fuelling, you can smell it and the plugs are soaked!

[bodga]

Still no joy so I am going to take the metering head off next and see if the pin is stuck which pushes the diaphram up and down in the head. Engine is over fuelling, you can smell it and the plugs are soaked!

I had this problem with mine, the car had been standing for years.

Release pressure from the system first by undoing one of the pipes coming from the fuel pump to the head.
 From memory, I took the long star bolts out the top of the meter head, and tipping the head upside down to gain access to the pin, I think i done it without disturbing too many banjo fittings too as not to create more leaks. wash the pin with petrol and refit. 

[Chris1276]

Decided to change the metering unit yet again and now have a mist of fuel at the spark plugs which are damp and spark well as before it was over fuelling. Car still doesn't run!!! The 5th injector braided ( blue cold start valve) which goes the inlet manifold has fuel going to it but doesn't spray at all into the inlet manifold even though its pressurising up to it. It seems to push the fuel back to the metering unit as when you release the bolt which connects the braided hose at the fuel metering unit fuel floods out . Changed the cold start valve so it isn't that. We sprayed easy start into the inlet manifold and this made the engine start and die so it has to be a fuel issue or possible electrical fault. Going to do a pressure check on the fuel system and get a friend to have a look at it as He has the experience we don't have. It has to be something simple and I just can't cope with having my Golf sat there not even running!!!

[Chris1276]

STILL NO JOY! Need as much advice as possible please people. Friend who is a mechanic is now ill and hasn't had the time to come and check things out. Checked the metering unit and the braided hoses seemed to be in the wrong place on the metering unit head so corrected that. I'm now getting a mist of fuel at the spark plugs and a good spark from the plugs. The blue cold start valve which goes into the inlet manifold doesn't seem to spray any fuel out at all and just pressurises in the braided hose back to metering unit. I was told it isn't needed to start the engine, it should start & run without it. My question is should it spray fuel when taken out out the inlet manifold and left connected?

Another thing which is happening is that the battery after being turned over to start engine is now dead and we keep recharging it 24-7 when its only say 4 months old. Taking it back tomorrow as it could be a dud & I'm not paying good money out for a battery that has a 5 year guarantee just to keep charging it up!!  Stress isn't the word but if a get hold of a sledge hammer the cars gunna get a hammering before being sent to scrap yard heaven!! ( Having spent lots of £ I don't really want to do this. )

[Ben Lessani]

The 8v K-Jet doesn't have an ISV - so there should be no buzzing in the engine bay - it should only be from the high pressure fuel pump.

You've probably done most of this already, but run though this

http://www.golfgtiforum.co.uk/index.php?topic=49436.msg1520084#msg1520084

The 5th injector is triggered by the WUR on the block. The 5th injector only fires for about 10 seconds, its not really the be-all and end-all for starting the car, so I wouldn't focus on it.

Check your compression and re-check your timing.

[Chris1276]

The 8v K-Jet doesn't have an ISV - so there should be no buzzing in the engine bay - it should only be from the high pressure fuel pump.

You've probably done most of this already, but run though this

http://www.golfgtiforum.co.uk/index.php?topic=49436.msg1520084#msg1520084

The 5th injector is triggered by the WUR on the block. The 5th injector only fires for about 10 seconds, its not really the be-all and end-all for starting the car, so I wouldn't focus on it.

Check your compression and re-check your timing.

[r0bster]

Hey guys I'm not gettin the fuel leavin the metering unit. What things could it b apart from lifting the flap 2 test them? Have all the k jet have the diafragam pressure switch thts nxt 2 the metering unit??