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quatk90
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PostPosted: Mon Apr 13, 2015 9:37 am Reply with quote Back to top

My 1985 90 Quattro has be laid up for a few years, tried to start it up at the weekend but failed to start, Tested Spark Plugs for Spark, ok, Fuel Pump, ok, Cold Start Valve, ok, Theromoswitch passed Tests as per the Haynes Manuals, anything else, I should check.
 
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Matt-Matt
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PostPosted: Mon Apr 13, 2015 10:07 am Reply with quote Back to top

quatk90 wrote:
My 1985 90 Quattro has be laid up for a few years, tried to start it up at the weekend but failed to start, Tested Spark Plugs for Spark, ok, Fuel Pump, ok, Cold Start Valve, ok, Theromoswitch passed Tests as per the Haynes Manuals, anything else, I should check.


Not sure what else I'd personally check but what does it do when it "Doesn't start", does it just click when you turn the ignition, does it stall out, does it try to start and not start at all?
 
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quatk90
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PostPosted: Mon Apr 13, 2015 1:01 pm Reply with quote Back to top

Thanks or the reply, the Engine keeps turning over but will not start, could it be blocked injectors, I have ordered new Champion Plugs, just to rule the old plugs out.
 
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Mikes2
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PostPosted: Mon Apr 13, 2015 1:07 pm Reply with quote Back to top

are you able to lift up the plate of the metering head to confirm fuel is getting to the injectors.

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quatk90
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PostPosted: Tue Apr 14, 2015 12:15 pm Reply with quote Back to top

Yes, Plate seems to be moving, I pushed it down, did not pull it up, can try this tonight.
 
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quatk90
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PostPosted: Wed Apr 15, 2015 7:42 am Reply with quote Back to top

I removed one of the Injectors from the head, tried the Starter but no
spray of petrol was coming from the injector, there is a petrol spray coming from the Cold Start Valve, both the Injectors and Cold Start Valve are fed by the fuel distributor, so where is the fault located.
 
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Mikes2
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PostPosted: Wed Apr 15, 2015 12:59 pm Reply with quote Back to top

It's fuel pressure that lifts the plate allowing fuel to reach the injectors.

Might be better using the z bridge to run the pump and lift the plate manually, rather than using the starter

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quatk90
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PostPosted: Wed Apr 15, 2015 4:02 pm Reply with quote Back to top

Thanks Mike, but what is the Z Bridge,
 
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Mikes2
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PostPosted: Wed Apr 15, 2015 6:28 pm Reply with quote Back to top

it's fitted to the fuse box in position 8. It's for manual cars which don't require the automatic park lockout

If you remove the fuel pump relay from position 10 and fit the z bridge from position 8 in its place, your fuel pump will run continually - even with no ignition.

It's useful to have an assistant.

You can use this to test your injectors

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PostPosted: Thu Apr 16, 2015 6:20 am Reply with quote Back to top

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quatk90
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PostPosted: Thu Apr 16, 2015 10:13 am Reply with quote Back to top

Mike, I pulled up the Air Plate with a Pliers and turned the engine on the starter and Fuel was sprayed from the Injector, so they seem to be ok, I understand from your comments that the Air Plate is raised by the fuel pressure from the pump, would I be right in thinking that it looks like the pump is not supplying enough pressure to life the Air Plate and this is the is problem, one other point, when the ignition is on should the fuel pump be running or does it only run when the starter is engaged.
 
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Mikes2
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PostPosted: Thu Apr 16, 2015 5:46 pm Reply with quote Back to top

It's possibly the pump or another component that can affect fuel pressure like the fuel pressure regulator (also often called the warm up regulator), fuel filter etc

The pump should be delivering about 800-900ml of fuel in 30 seconds

I'm guessing yours is a KV. That won't run the pump with only the ignition on.

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