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928 cut off check oil light

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Old 12-28-2009 | 12:30 AM
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im sure im trying to jump the correct holes
Old 12-28-2009 | 12:32 AM
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if you where to push that guys hand in thats where my wire was, your left circle seems like its off the connector completly
Old 12-28-2009 | 12:38 AM
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If the fuel pump was jammed then it would make a quiet "thump" when energized. It would also pull 8-10 amps which would be enough to turn a thin piece of wire red-hot.

An '89 has the in-tank pump, right?
Old 12-28-2009 | 12:41 AM
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Look at the picture of the relay provided 30 and 87 are the ones you short together. The relay numbers 53 are upside down on some cars, this is the same as a VW relay available at most AP stores. Your pins to short are 9 and 3 O'Clock you can use your horn relay as a test. Checking your timing belt is more involved, so start with what breaks most the FP relay or Fuel Pump.
Get a helper jump the relay and start the car and have them listen for the pump turning on. If it floods and you smell fuel it takes a lot to get it started. A bad Temp II sensor will have the same no start symptom, Every sensor that is important should be checked at the computers, it makes it a lot faster and cuts out the guess work.
Old 12-28-2009 | 12:43 AM
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jcorenman if the fuelpump is jammed can i stick my multimeter inside the relay and check how many amps its giving out? what would it give out anyways? i know their is a fuel pump and filter on the back of the car under a panel.
Old 12-28-2009 | 12:44 AM
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just in case anyone lives nearby i live in scripps ranch / miramesa area
Old 12-28-2009 | 01:04 AM
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I was dead serious to use a paper clip. It's a solid piece of steel that can, for a little bit, handle enough load to do the testing. Multimeter wires are very thin with lots of insulation and will easily overheat...... ask me how I know.

I was trying to have you use whatever you have handy but, it starting to look like you better get someone that knows a thing or two about cars. Or else you'll end up damaging something that was not part of the original problem.
Old 12-28-2009 | 01:12 AM
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Originally Posted by 88porsche928
jcorenman if the fuelpump is jammed can i stick my multimeter inside the relay and check how many amps its giving out? what would it give out anyways? i know their is a fuel pump and filter on the back of the car under a panel.
The pump will pull more amps if it is jammed/stalled, but I think the best test is your ears-- with the ignition on, fuel-pump relay jumpered (relay XX on an '89) you should hear a quiet "buzzing" from the fuel pump (no need to crank the engine-- but ignition must be on). If you hear a "thump" and no "buzz", then your pump is jammed. This is a common failure with a second in-tank pump: The small hose that connects the in-tank pump to the fitting, inside the tank, rots from the ethanol or other additives in fuel and falls apart. The debris then jams the main pump.

You can confirm a second pump: Remove that fuel-pump cover (10mm wrench) and find the tank fitting-- if it has two wires in addition to the fuel hose, then you have an in-tank pump. The best fix is to drain the tank, remove the fitting and in-tank pump, and replace it with the strainer (no pump) from an 87/88 S4. And then clear/clean the main pump or replace it. Not a simple roadside job...

Our recent experience is here:
https://rennlist.com/forums/928-foru...mp-upated.html
Old 12-28-2009 | 01:15 AM
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heres what i tried connecting together
http://www.shuttlenutrition.com/fuserelaypanel.jpg
Old 12-28-2009 | 01:16 AM
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Old 12-28-2009 | 01:18 AM
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With the hood open, turn the ignition switch on - don't operate the starter. Listen carefully to the injectors - if they are clicking, the LH ECU has failed.

If you have someone to help you, kneel down by the rear bumper and have the helper operate the starter. You should hear the buzz or whine of the fuel pump. If not, check Fuse #42.Swap Fuse #42 and Fuse #18, and see if the horn still works. If there is no buzz, and Fuse #42 is OK, swap Relay XX (the fuel pump relay) and Relay XIV (the starter relay). If the starter no longer works, the relay is faulty. You can get the car going by swapping in the horn or defrost relay.

If you have a fuel pump buzz, use a mechanic's stethoscope, a piece of tubing, or a long wooden rod to listen to an injector as the helper operates the starter. There should be a regular "click, click, click" as the starter operates.
Old 12-28-2009 | 01:34 AM
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i switched both new fuses around 42 and 18, then i switched the starter and fuel pump relay around and it still didnt start. i am by myself but when i turn the key not all the way but close without turning the starter i hear a few clicks like 3 or 4 then it stops. i am 80% sure my lh ecu is bag. how much does jds charge to have it rebuilt?
Old 12-28-2009 | 12:03 PM
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Throwing parts at a 928 problem gets really, really expensive in a hurry. I would suggest more troubleshooting, and more testing. Don't jump to conclusions so quickly...
Old 12-28-2009 | 03:38 PM
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88 Have you looked at your 14 pin connector (next to/below) jump post on passenger side in engine bay near front? Sounds like before your start throwing $$$ via EZK and LH, check for corrosion and condition of the 22 year old wires in there. Search the forum for ground wire cleaning.

Have a look at my post : http://reutterwerk.com/forums/showpo...4&postcount=36
I used heat shrink from the autoparts store to fix this at the 14 pin connector and starter. Also power wire on driver side near front is worth checking for same.
Old 12-28-2009 | 04:57 PM
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just mailed lh to get tested i will check 14 pin connector when i go home today, i am starting to think it was internal fuel pump. thanks for the information.


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