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2369488 2369488 is offline
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Join Date: Jan 2007
Location: Wichita
Posts: 81
Fuel pump shutoff intermittent - need electical diagram for '86 930?

About a month ago I had a problem of the engine shutting down under boost 4K Rpm. I check and changed all of the relays including the yellow one. I even changed the over boost sensor and it seemed to run OK. Less than 50 miles later it is starting to show the same symptoms again. I'll be running down the hwy in 3rd gear, punch it as the boost gets to 1.1 and he RPM varies from 4K to 5K and the engine shuts down. As I am coasting in gear the engine starts back up again.

I have a 3" vac. boost Gage and it appears to go to 1.1-.2 under full boost. (I was told the car had a 1 bar spring?)

I am thinking it is an electrical problem.

Tomorrow I am going to try a few more things:

1. Check to make sure the fuse connections for the fuel pump are clean.
2. Ground the new over boost switch just to take it out of the equation.
3. Lastly check the diaphragm in the Waste gate

Any other suggestions.

A wiring diagram for an '86 930 would help. Someone from this site emailed me a number of pages for an '89 but they were not readable.
Old 04-14-2007, 06:19 PM
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