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E34 M5 died while driving
Posted: Apr 03, 2012 9:07 PM
by 1st 5er
My wife called me and said;
Downshifted into second, went through the traffic light and before shifting into third noticed that the car had died suddenly.
There was no sputtering or other symptoms.
She coasted into a parking lot and it wouldn't restart.
I arrived and tried starting it to no avail.
It turns over fine and even fires off initially but immediately dies.
It shows 1/4 tank of fuel, but I added about 2 1/2 gallons, same symptoms.
Thoughts?
Posted: Apr 03, 2012 9:10 PM
by mooseheadm5
My guess is relay or fuel pump. Try jumping out the FP relay to see if you can hear the fuel pump running.
Posted: Apr 03, 2012 9:24 PM
by Mark 88/M5 Houston
Check and reseat the connector on the AFM.
Posted: Apr 03, 2012 9:25 PM
by 1st 5er
mooseheadm5 wrote:My guess is relay or fuel pump. Try jumping out the FP relay to see if you can hear the fuel pump running.
That's what I was thinking, as was she.
Now, it's to the Bentley for locations. My E34 S38 OJT'ing has begun.
Posted: Apr 03, 2012 9:28 PM
by 1st 5er
Mark 88/M5 Houston wrote:Check and reseat the connector on the AFM.
This I tried, as with several other connectors in the engine bay, along with the relays in the fuse box.
Posted: Apr 03, 2012 10:00 PM
by mooseheadm5
It may fire right up tomorrow. If so I would suspect either the crank sensor or fuel pump. BTW, the fuel pump is annoying to replace.
Posted: Apr 04, 2012 3:14 PM
by 1st 5er
Today's diagnostics;
It didn't start right up.
I replaced the fuel pump relay with a known good one and it didn't start.
I jumpered #30 and #87 and the fuel pump sounded like a diesel engine, sorta.
With it jumpered, and sounding like it was about to fall apart, it fired right up.
Replaced the jumper wire with the relay and it fired up again, and again, and again, and...
Bottom line, bad fuel pump.
Next step is determining if I have the top or side feed model.
http://www.penskeparts.com/Diagrams/B00 ... =191028905
Posted: Apr 04, 2012 4:00 PM
by mooseheadm5
I replaced mine with a TRE pump (#6 style in your pic.) Works great and is quiet.
Posted: Apr 04, 2012 5:47 PM
by 1st 5er
Mine turns out is the side feed.
For now, I'll just take the unit out of the '91 and install it in the '92.
I'll then replace the stock from the '92 with an after-market, possibly the TRE-340, if that would be the one, and use it as a back-up.
Posted: Apr 04, 2012 7:49 PM
by 1st 5er
She's back on the road again, literally, rolling this time though.
Thanks Paul and Mark.
Posted: Apr 04, 2012 7:51 PM
by Mark 88/M5 Houston
Glad you got her back on the road.
Posted: Apr 04, 2012 7:53 PM
by mooseheadm5
Yup, I used the TRE 340 in mine.
Posted: Apr 04, 2012 8:00 PM
by 1st 5er
That's what I'll get and throw it in the spare parts box.
Posted: Apr 04, 2012 9:18 PM
by MShimon
Yay, another M5 back on the road. Good work team.
Posted: Apr 06, 2012 2:04 PM
by wkohler
You're lucky you only had 1/4 tank of fuel in there. I had to replace a pump with a full tank. Ick. Then I wired it backwards thanks to two brown wires.
Posted: Apr 06, 2012 5:32 PM
by mooseheadm5
wkohler wrote:You're lucky you only had 1/4 tank of fuel in there. I had to replace a pump with a full tank. Ick. Then I wired it backwards thanks to two brown wires.
Almost the same here. I had to redo it because the "good" used pump someone at the shop gave me turned out to not be very good.
