savantauto

I just spent a boatload of money trying to fix a no start problem for my 1986 930.

Both fuel pumps, thermal time switch, a couple of relays, cold start valve and warm up regulator have been replaced. The car sometimes starts sometimes and sometimes not. Now I am told my injectors are leaking down!

Any suggestions?

Mark Houghton

Grab a glass of fine wine, and commence to read this:

http://forums.pelicanparts.com/911-9...snt-start.html

Darn near every possibility is covered. My bet: yellow boost pressure relay, overboost sensor, or the silver over-speed relay under the drivers seat. These all work in concert with the Devil to stop your car dead.

handdoc

thats the link to look at, its exhausting reading...

fullquack

Leaking injectors do not cause a NO START condition, they just cause a real crappy start condition.

This can go from a "flooded type" start condition, to a "crank forever until you get fuel" start condition, depending on how long the car has sat since last run, but it will always eventually start.

Mark

savantauto

Thanks for the input. New injectors are on order. Even if the car will eventually start with leaky injectors, the idea of cranking forever does not work for me. The boost relay and engine run on relay were the ones that were changed. I will look into the one under the seat. This has been a loooong process!!

automan9

I had the same problem with my 89. Even though the fuel pump fuse looks good, replace it. Solved my problem after a long period of starting most of the time. Good luck

savantauto

Thanks for the reply. The car is now in the shop. Hopefully being fixed!!

savantauto

New plugs, new injectors, some cleaning in the fuel head, and a new fuel accumulator and she starts like a champ!

MUSSBERGER

Accumulator?

Mark Houghton

Probably, but one would think that even with a bad accumulator the car would still eventually start after considerable cranking.

The other day I plugged back in the plug that's hooked to the metering plate arm, which of course prevents the pumps from running until you crank the engine. Prior to that - with the plug un-plugged - I would let the pumps run for a couple seconds then hit the starter, and she'd fire up in less than one full crank revolution....vertually instantaneously. Now, all I get is the normal split second momentary pump run as the yellow relay energizes and de-energizes, and it takes about 2 seconds of cranking for her to fire up. This is after sitting for a couple weeks, so I suspect my accumulator is showing some wear or I have injector leakdown...or both. I would leave that thing unplugged if it wasn't for the safety feature it provides.

MUSSBERGER

When I first got the CIS equipped 380sl from my folks it didn't want to start and finally got to the point no start. Checked all the usual stuff per the interweb and it all pointed to the accumulator. Installed new and shazam!

speednme

Make sure you hear the pumps when you turn the key, if not you may want to try this http://forums.pelicanparts.com/911-9...-solution.html

I had a similiar issue and the fuse upgrade fixed the problem...don't give up just yet..you'll get it