My Baby Won't Start

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15 years 9 months ago #1697 by bstevens
My Baby Won't Start was created by bstevens
I would appreciate any help. I am still learning about my 91 928 GT so here goes. I have been able to drive the car the last couple of days but it won't idle. If I take my foot of the pedal, the engine will quit. I have to keep my foot in it and the RPMs up. Very annoying. I was told possibly a fuel pump. Not sure though. Now won't turn over at all. It tries, but won't start. I've been doing some research on the LH module as far as the idling. Am I headed the right direction? Is this a fuel pump issue and if so which one. I have replaced all fuses as this car sat for a pretty long time and most had surface corrosion. And yes there is fuel in the tank. I also have a question about my horn not working. Have replaced fuse and relay. Thanks.

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15 years 9 months ago #1698 by 928mac
Replied by 928mac on topic My Baby Won't Start
Hello my friend.
I have to move your post to the technical discussion thread.
This is the event thread
I will delete my post in 3 days

forums.928oc.org/vbulletin/showthread.php?t=351

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15 years 9 months ago #1699 by 928mac
Replied by 928mac on topic My Baby Won't Start
Are there any codes?

Did you look through the tech tips well we are waiting for someone who knows where to start.

forums.928oc.org/vbulletin/forumdisplay.php?f=10

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15 years 9 months ago #1700 by Kiln_Red
Replied by Kiln_Red on topic My Baby Won't Start

928mac;1750 wrote: Are there any codes?


That's a little hard to determine without a scan tool or the Hammer.

It would be helpful to know a few more of your symptoms. When the car was still running, was it running noticeably rich or lean? When you turn it over, does it attempt to start at all? Get a helper. With the hood up, have the helper turn the key on and listen for any clicking noises coming from the region of the fuel rails. This could be an indicator of LH failure. Since you're relatively close, I wouldn't mind making an hour trip west if we're not able to help you get it going again via internet contact.

The first thing I would do is go to the closest parts store and rent a noid light. They usually rent them out in a set of four. One for each of the big three, and one just simply for Bosch fuel systems. Plug the noid light into each of the 8 injector harnesses, one at a time. Have a helper turn it over and watch the noid light to confirm whether you have any injector pulse or not. Report back with your findings. Also, while you still have your helper handy, have them turn it over again while you kneel down at the passenger rear side of the car. You should be able to hear your fuel pump running. It kind of sounds like a whining noise. Do this whether you have an injector pulse or not, and again, report your findings.

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15 years 9 months ago #1701 by SeanR
Replied by SeanR on topic My Baby Won't Start
First thing you want to check is that the Throttle Position Switch (TPS) is making it's click when the throttle is closing.

Open your hood and stand on the passenger side, move the throttle cable assembly and listen for a clicking sound after you let go of the assembly. If you hear the click, then you know the TPS is making the correct contact, and you can move on to something else.

Most of these issues are related to that, or unmetered air entering the intake due to either a vacuum leak.

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15 years 9 months ago #1702 by Kiln_Red
Replied by Kiln_Red on topic My Baby Won't Start
Here's a good guide to follow for no start situations on LH-equipped 928s:
www.jdsporsche.com/fault%20find.html

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