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PJimmy
New User
Jun 16, 2015, 4:05 AM
Post #1 of 6
(1382 views)
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audi
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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.
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Discretesignals
Ultimate Carjunky
/ Moderator
Jun 16, 2015, 4:24 AM
Post #2 of 6
(1376 views)
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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.
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Discretesignals
Ultimate Carjunky
/ Moderator
Jun 16, 2015, 4:33 AM
Post #4 of 6
(1372 views)
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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:
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)
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PJimmy
New User
Jun 16, 2015, 4:59 AM
Post #5 of 6
(1365 views)
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Well if my fuel pressure is fine what would be next thing to check?
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jun 16, 2015, 7:03 AM
Post #6 of 6
(1362 views)
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Look back to the post with instructions - it's spelled out as much as can be IMO,
T
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