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Join Date: Mar 2003
Location: Texas
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1976 experts? No start

After 30 years my first no start. Been driving the car 15-30 miles a day at least 3 times a week in anticipation of some big road trip for the last 3 months. Just last week someone here was talking about relays. Someone pointed out the 76's were different. I have a red relay on the rear left engine bay shelf. Thought I had some spares but no. I'd taken it for a good hard run. Currently applying some leather treatment for the front seats and let it sit for several hrs. Get in crank crank crank no fire. Jiggle relays, check fuses try again in another 30 min. Nothing. Push car in garage. Try an hr later. Crank fire for a sec dies. Another 15 same. Search forums. Here I sit stumped.

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Old 03-22-2015, 02:25 PM
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If you can reach around to left side of the metering flap and disconnect the electrical connector, you should hear the fuel pumps should run as soon as the key is turned on. If they don't then check fuse connections, fuel pump relays and the overboost pressure switch electrical connection is good. If the fuel pumps run, then you need to check for spark.
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1977 930 Slant, MS3 EFI, Carrera intake, Twin plug, Powerhaus headers, Magnaflow muffler, Garretson intercooler, GTX3071R
Old 03-22-2015, 05:55 PM
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They run 2 fuel pumps through 1 fuse from the factory.

It is common these days to have the fuel pumps wired up to individual fuses, as this circuit sees high loads.

You can use a black relay for testing purposes, just don't leave it in there for good.

The two rear most relays under the hood are fuel pumps. The rear relay in the engine bay is overboost and engine run.

I have a 76 and found 1975 wiring diagrams more relevant than anything else.
Old 03-23-2015, 12:12 AM
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do you have gas in it?

FP's not working. dont know if it will start with just one running but i think it would......maybe
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Old 03-23-2015, 04:12 AM
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Got in this morning and fired right up. I had just placed my order in for the red and two browns. I thought I had some in the glove box from long ago but it was just fuses and some headlight replacement bulbs. Of course my wife asked me what I would have done had we taken the 930 up to Denver last weekend.

Yesterday when I went for a ride I shifted at 6500 in first and second gear. Of course the boost was maxed. What exactly does the over boost relay do?
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Old 03-23-2015, 10:23 AM
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You won't over boost in normal driving. It's just there in case of a waste gate failure or alike.

The car will start with one fuel pump running, but badly.

Ensure the fuel pump fuse and the wires at the fuse block are clean.

In fact just put a new fuse in it to be sure.

Old 03-23-2015, 11:31 AM
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