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Re: No fuel to 16V, Please HELP!
Does the fuel pump activate when cranking the engine?
Does it really? Are you sure? Have you assistant crank and you listen or feel.
If no it could be a couple of things
1) ICM (Ignition control module)
2) Knock Box
For the ICM if have a spare plug it in and see if it changes the
situation. If not it is more than likely the the ground circuit in the
Knock Box is burnt. And to test that theory pull the harness to the
knock box find position 10 in the harness connector (verify this in
the ground in the Bentley). Now pull the coil wire from the
distributor and place 5mm from a bolt, turn on the ignition to the run
position. Now with everything in place ground out postion 10 in the
harness to the negative post on the battery. Did you get spark and did
you hear the fuel pump hit at the same time, you should have.
So if by doing this test you got spark and the fuel pump hit you have
proved the knock box is bad. This is the last test after the hall
sender is checked, and the ICM is checked.
The engineers looked at it this way for the fuel system on the VW, if
the system fail to deliver spark do not deliver fuel. Pretty damn
smart in my opinion
Brian
On Tue, 22 Mar 2005 20:06:17 -0800, Gordy Stedman <ydrogs@gmail.com> wrote:
Just finally got the stench of premium unleaded out of my hair and
thought I would update on the fuel problem we were having with the 16V
Cab converstion.
Pressured up the system and found fuel filter to be slowing down the
flow of gas. Replaced it and got more pressure and there was
resistance from the fuel plunger when manulally moving the intake
plentum but we still were not getting fuel to the injectors. Did fuel
return rate test per Bently and it passed which confirmed that pump
and transfer pump were working ok. We removed all the injectors and
unscrewed each one. We removed the electrical plug from the fuel
pressure regulator and started to get some action. Still do not know
exactly why fuel distributor started working but it did. Guess we
just had to milk it long enough. Put all the injectors and air box
together and it works! Whish I had a definate reason on what exactly
the problem was though. Oh well, time to get that POS out of the shop
and put a 16V in a real A1 VW:) Thanks for everyones input.
On Sun, 13 Mar 2005 18:24:18 -0800, Gordy Stedman <ydrogs@gmail.com> wrote:
> OK, here is the setup:
> 85' Cabriolet, Scirocco 16V 1.8L transplant(everything stock),
> installed 16V Scirocco engine wire loom with computer and knox box,
> CIS-E fuel system.
>
> Problem:
> No fuel to 4 injectors.
>
> Checks using Bently cabriolet and scirocco service manual 1985-1993:
> Fuel in from filter and return line out of fuel distributor have
> pressure. Fuel is present in cold start line. Checked every wire
> into main computer plug except did not have a LED to test RPM signal
> from knox box(do not even know if that matters). Amperage across the
> fuel pressure regulator is with in specs of Bently even replaced with
> another used unit and same problem. Potentiometer check within specs
> of Bently (Error in table d page 5-45 on pins, use these; sensor plate
> at rest 17&14 > 4000ohms, sensor plate at rest 18&17 < 1000 ohms,
> sensor plate lifted 18&17 > 4000ohms. Don't beleive me just cross
> reference potentiometer checks on page 5-43).
>
> Wild ass guesses:
> Jumped fuel pump, turned on ignition and opened air box and held air
> sensor plate in up position with injector pulled out and no fuel out
> of injectors. Held sensor plate up and turned car over and no fuel.
> Hit fuel distributor with a rubber mallet, no fix but good arger
> release. Unswcrewed the fuel distributor and made sure control
> plunger was moving and it was.
>
> I have been working on this problem for 2 days and am at a loss. Any
> thoughts would be greatly appreciated.
--
Gordy
MK1 x 3
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