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PJimmy
New User

Jun 16, 2015, 4:05 AM

Post #1 of 6 (897 views)
post icon audi Sign In

 
Please help!
Posted: Jun 16, 2015 6:32 AM
audi , fuel problems

Car won't start 1985 Audi coupe 4000. Changed Sparks wires , ignition coil , fuel pump, fuel filter underneath car by pump. Still won't start I sprayed ether straight into the engine head and it fired up and died right away. Don't know what to check next. I'm going to check timing belt and fuel pump relay. But when the key is on you can hear the fuel pump faintly. What else could be wrong. Please help.


Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Jun 16, 2015, 4:24 AM

Post #2 of 6 (891 views)
Re: audi Sign In

If the engine ran on starter fluid, more than likely you have a fuel problem. You should check fuel pressure next. It should be somewhere between 75-81 psi. Fuel volume should be around 760cc in 30 secs. The fuel system on that is Bosch's KE jetronic. You should read up on its theory of operation, so you understand how it works and how to troubleshoot it.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


PJimmy
New User

Jun 16, 2015, 4:30 AM

Post #3 of 6 (888 views)
Re: audi Sign In

How do I check fuel pressure I assuming the took to do so is relatively spendy? If my fuel.pressure is alright what else could be the issue. Fuel problem is what's I've been thinking. Unsure if it's the second fuel filter being clogged or if my fuel distributor is Sh!t which was just relaxed withing.the last
year

In Reply To


Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Jun 16, 2015, 4:33 AM

Post #4 of 6 (887 views)
Re: audi Sign In

If you don't have the correct pressure and volume, the fuel system doesn't work correctly.


Here is the procedure for checking system pressure:


Quote

SYSTEM PRESSURE TEST

1. Connect the pressure gauge with the proper adapter (VW 1318/5), and new sealing washers, between the fuel line at the cold start valve, and lower chamber test connection on the fuel distributor.
2. Remove fuel pump relay, and install a jumper wire with in-line switch.
3. Disconnect the plug from the differential pressure regulator.
4. With the gauge valve open, activate the fuel pump and read the pressure.
System pressure should be 5.2 - 5.6 bar (75 - 82 psi).
5. If pressure is below the specified value:
a. Test output quantity of fuel pump, (see "FUEL PUMP").
b. If fuel pump output is OK, replace pressure regulator.
6. If the fuel pressure is greater than specified:
a. Disconnect fuel tank return line from pressure regulator. (Place a fuel proof container under the regulator to catch the fuel).
b. Activate the fuel pump and read the fuel pressure.
c. If the pressure is OK, check for blocked fuel return line.
d. If pressure is still incorrect, replace the pressure regulator.







Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Jun 16, 2015, 4:39 AM)


PJimmy
New User

Jun 16, 2015, 4:59 AM

Post #5 of 6 (880 views)
Re: audi Sign In

Well if my fuel pressure is fine what would be next thing to check?


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jun 16, 2015, 7:03 AM

Post #6 of 6 (877 views)
Re: audi Sign In

Look back to the post with instructions - it's spelled out as much as can be IMO,


T







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