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924pimped · Joined: 29 Jan 2005 Posts: 4 Location: highland california

i have a 924 1980. love the car and i do all my own work. recently this new issue has stumped me. 3 days ago it started to idle erratically then stopped all together that night . that night i found it super hard to start then once started had to hold the gas down a little to keep it alive. i took out the injectors to run a test and found that next to no gas comes out. i took all lines apart to make sure theres no clog and removed the fuel distributor to pull up and down on the control piston ,that was operational.....the only things i can think of are the control pressure regulator or the accumulator...but i dont know it gets fuel in but wont come out the injectors unless i hold the sensor plate up....

someone help me pleaseeeeeeeeeeeeeeeeeeeeeee
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got a 1980 924

jpab924 · Posted: Sat Jan 29, 2005 3:00 pm Post subject:

Sorry, but you are a little hard to understand.

You will not get any fuel flow by moving the sensor plate (the big round flap looking thing) unless the fuel pump relay is jumpered.

There are plenty of people on this board that can help you with your malady, but you have to be a little more concise.

tj924 · Posted: Sat Jan 29, 2005 3:01 pm Post subject:

According to this thread, you need to open the air sensor plate to get fuel to the injectors.
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TJ
Silver '82 924 NA 5-Speed Manual

924martinirossi · Posted: Sat Jan 29, 2005 3:14 pm Post subject:

Make sure that the air boot is securely attached to the metering unit. I had it loosen up and the car sucked air directly in to metering plate and I had to keep on the gas. Normaly it is not a problem untill you are on a race track!

MIchael

924pimped · Joined: 29 Jan 2005 Posts: 4 Location: highland california

i took out the injectors to run a test by bridging the 87 and 30 lines. I found that next to no gas comes out. i took all lines apart to make sure theres no clog and removed the fuel distributor to pull up and down on the control piston ,that was operational.....its getting fuel inside but the pressure in the lower chamber is so much that when i pull up on the sensor plate its very difficult because of overpressurization... the only things i can think of are the control pressure regulator or the accumulator

thanks all
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got a 1980 924

924pimped · Joined: 29 Jan 2005 Posts: 4 Location: highland california

i took out the injectors to run a test by bridging the 87 and 30 lines. I found that next to no gas comes out. i took all lines apart to make sure theres no clog and removed the fuel distributor to pull up and down on the control piston ,that was operational.....its getting fuel inside but the pressure in the lower chamber is so much that when i pull up on the sensor plate its very difficult because of overpressurization... the only things i can think of are the control pressure regulator or the accumulator

thanks all
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got a 1980 924

gohim · Joined: 02 Nov 2002 Posts: 4459 Location: Rialto, CA

The control pressure is regulated by the warm up regulator when the engine temperature is cold.

You do not need to jumper the fuel pump relay to test the fuel pumps simply turning the ignition key to "run" and lifting the airflow sensor plate should cause fuel to spray from each injector in a fan pattern. Are you sure that both of your fuel pumps are good? Has the car ever sat for an extended period, or been run out of gas? If so, then there is a good chance that you have a fuel pump problem. If one fails, the remaining fuel pump will not be strong enough to supply full pressure under all conditions, without removing the dead pump from the line.

dpw928 · Joined: 02 Nov 2002 Posts: 1860 Location: owasso, ok 74055

How old is your fuel filter?

Dennis
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81 931 5 sp
78 928 5 sp Silver
78 928 AT Euro Black

Joes924Racer · Posted: Sun Jan 30, 2005 3:37 pm Post subject:

sounds like a fuel dizzy issue...if the pumps worken do a test to see how much fuel comes out at the fuel filter then again do the test at the fuel return line..just like the HAYNES manual says to.
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1979 porsche 924 Na
1980 porsche Turbo 931GT Replica
Have u ever driven a turbo.

924pimped · Joined: 29 Jan 2005 Posts: 4 Location: highland california

it seems that when i take out the pressure regulating valve in the fuel distributor, the fuel flows freely with low current cunsumption. its almost as if there is something wrong in the fuel distributor how often do these go out???????????????????????????????????
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got a 1980 924

dpw928 · Joined: 02 Nov 2002 Posts: 1860 Location: owasso, ok 74055

My 80 NA ran for over 300K with the same fuel distributor. The key word is "ran". If allowed to sit and lacquer up the fuel distributor will plug and cause the internal o rings to deteriorate. The valve control the system pressure and directs excess fuel back to the tank. Is the o ring on the end of the valve in good shape? Have you measured system and control pressures?

Dennis
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81 931 5 sp
78 928 5 sp Silver
78 928 AT Euro Black

Khal · Posted: Mon Jan 31, 2005 12:30 pm Post subject:

Bet'cha a buck one or both of the fuel pumps have packed it in...
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'80 924 Turbo

CMXXXI · Joined: 05 Nov 2002 Posts: 1939 Location: Vicksburg, MS

Are both pumps working? What is your measured delivery rate/volume? What is the measured system pressure? What is your measured control pressure? The answers to these questions will really, really help you track down the problem.

The fuel distributor has to get enough fuel at the correct pressure in order to do it's job.
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'79 Eurospec 931