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car quits at idle?

I had my 84 930 euro out on saturday and was sitting at a stop light and she just quit like the key turned off or it ran out of gas. I could hear the fuel pumps running after it shut down and I had no warning lights come on before it shut down. Plenty of fuel and I know the oil level is good as I had just checked it(with the engine running and sufficiently warmed up its between the two metal dashes on the stick). I had a new alarm put on it a few months back and i have never had any issues with the ignition kill? she did start righ back up and I drove her home without incident. any thoughts?
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Old 01-02-2011, 10:14 AM
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Same symptoms for me turned out to be the over-boost relay in the rear. Mine is red but yours may be yellow. You probably didn't hear the pumps but rather the CDI whine.
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Mark 1979 930 Euro ***GONE AND DON'T MISS IT AT ALL***

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Old 01-02-2011, 10:20 AM
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It could be air lock in the lines - high points - sometimes it happens and goes away... Take the car for a good ride boosting up... to clean the system.

Last edited by Miguel Antonett; 01-02-2011 at 10:26 AM..
Old 01-02-2011, 10:24 AM
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is that the relay that threads into the intercooler? if you happen to know of a pic to steer me in the right direction I will start there. thanks
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84 930 Slant
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Old 01-02-2011, 10:24 AM
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I did have the nose jacked up for a few days as the front oil cooler brackets had broken and I had to remove it to get it repaired and then the aluminum washers were not sealing real well... now shes all tight and not leaking,. I did start it with the nose off the ground to check for leaks maybe that weird angle did something?
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Old 01-02-2011, 10:28 AM
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Search "yellow relay
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Mark 1979 930 Euro ***GONE AND DON'T MISS IT AT ALL***

"Worrying about depreciation on your car and keeping mileage down is like not ****ing your girlfriend so her next boyfriend finds her more appealing"
--clutch-monkey
Old 01-02-2011, 10:37 AM
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Quote:
Originally Posted by j930 View Post
is that the relay that threads into the intercooler? if you happen to know of a pic to steer me in the right direction I will start there. thanks
Look at post #9:

Sticky for common answers to why "My car doesn't start...."
Old 01-02-2011, 11:44 AM
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is that the relay that threads into the intercooler? if you happen to know of a pic to steer me in the right direction I will start there. thanks
The devices in the intercooler are a boost sensor and boost sending unit. The relay is on the left side of the engine as indicated by the pic reference Ronnie made above. The boost sensor (white wire) opens the overboost relay in an overboost condition which shuts down the fuel pumps.
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Mark 1979 930 Euro ***GONE AND DON'T MISS IT AT ALL***

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Old 01-02-2011, 11:51 AM
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i had just put my engine back in a couple weeks ago and made a couple changes to the fuel injection. the richness at idle was way off. it was fine until the wur switched from cold control pressure to warm control pressure.
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Old 01-02-2011, 01:01 PM
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Don't get me started on the yellow relays from hell.....

You thought you could hear the fuel pumps running after she died....interesting, as the fuel pumps should not run unless the engine is pulling air across the fuel metering arm plate. Unless, of course, changes had been made to your circuits to allow the pumps to run independent of the engine running.

As mentioned, the overboost sensor switch will shut down the fuel pumps if it sees high enough boost, or if it's faulty. It has just one single wire going to it, and a bad connection could stop you dead from a fuel standpoint.

If you still heard your pumps running, then perhaps it wasn't the pumps you heard but rather the fuel frequency valve that's part of the Lambda system. That valve resides behide the fuel distributor and makes quite a chattery/buzzy racket.

Unfortnately, you may not find the cause until it does it again...and again....to where you're able to systematically elliminate causes. Aren't these cars fun???
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Old 01-02-2011, 06:31 PM
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Happy new year guys!

Not so happy with my car either.
Idle issues, then dies.
It started acting up when the weather was changing-colder.
Started up great..Once warmed up-the idle went from 950rpm to below and started hunting. I cleaned the plugs, chked for vacum leaks, connections..etc..etc..nothing.

Then on the my 1st day of vacation/Saturday I decided to take the car for a run.. Not even 5min. on the Hwy drving 50mph.. just died. Tried starting--no...Tried it from a roll/gear-no...
The car tries to start/crank..ETC...feels like no fuel getting in.
Good thing my sis has an old 88 jeep/wrang. for a tow..Front hook works well.

After speaking with my wrench. He suggested it could be the pickup-coil in the distrib. I currently have a msd6al and msd coil. MSD6AL-only a 1 yr old and the coil only approx 7yrs old. Currently I took the whole distributor out and taking it to the shop for inspection. See what happens. To much snow and mess to drive anyway...
Just another thing to keep me occupied.....

Walt
Old 01-03-2011, 06:52 AM
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Walt

Check your rotor to see if it's a RPM limiter type. Some say the diode/resistor under the epoxy can burn out. Then check to see if you have fire out the center fuzzy lead and at the sparkplugs.

I had to remove my MSD6AL and coil when it didn't start. Wasn't the rotor and I'm not positive it was the MSD, but with the stock ignition, it fired right up.
Old 01-03-2011, 09:26 AM
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Thnxs

Interesting-I do have the RPM limitier type. Hidden in the epoxy trick....hmmm...

When you say your stock iginition.....it fired right up... Can you be more specific... R u still running MSD?

Walt
Old 01-03-2011, 10:52 AM
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Walt, also check your grounds, and the fuel filter.
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Old 01-03-2011, 12:41 PM
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guys as always thanks for the insight. I did find the wire to the overboost sensor was loose so I crimped the ends a little to tighten, I will see if that helps.
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Old 01-03-2011, 01:59 PM
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No, I took the MSD and coil out. With the stock CDI and coil, it fired right up.

Quote:
Thnxs



Interesting-I do have the RPM limitier type. Hidden in the epoxy trick....hmmm...



When you say your stock iginition.....it fired right up... Can you be more specific... R u still running MSD?



Walt
Old 01-03-2011, 07:17 PM
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Thnxs

I hope it doesn't come down to that...
These cars can drive u MAD..I TELL YA....MADDDD...

Walt..
Old 01-04-2011, 05:24 AM
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Quote:
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Thnxs

I hope it doesn't come down to that...
These cars can drive u MAD..I TELL YA....MADDDD...

Walt..
Walt, chill out dude! It can only get worse. At best, it will drive you to drink heavily whilst grubbing around the engine compartment to find the SOB that's causing you problems. Just remember to sober up before going for test drives.
These things we call 930's are definitely a love-hate relationship.
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Old 01-04-2011, 10:15 AM
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LOL---


I needed that,,,!! Last night at approx. 11pm...I get out of bed--Go into my garage-(heated),,And start searching for wires WITH MY LAMP..blah.blah....Heck--I DON'T EVEN KNOW WHAT I AM TRYING TO FIND SOMETIMES....LOL.....

Im losing it.....But within 10min-- I'M SINKKING ALOT...what am i doing in here...I GOT WERK TOMMORROW.....ZZZZZZ...

Walt..

P.S. I started looking for 996tt..prices look pretty good..But then again I wouldn't leave it stock...And that would start more problems again
Old 01-04-2011, 11:01 AM
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Happy new year guys!
It started acting up when the weather was changing-colder.
Started up great..Once warmed up-the idle went from 950rpm to below and started hunting.

Then on the my 1st day of vacation/Saturday I decided to take the car for a run.. Not even 5min. on the Hwy drving 50mph.. just died. Tried starting--no...Tried it from a roll/gear-no...
The car tries to start/crank..ETC...feels like no fuel getting in.
Walt
Walt, I do most of my best planning, designing, and troubleshooting lying awake at night, but I don't know that I've ever rambled around naked in my heated garage looking for 930 faults when I should be sleeping. Drink more bourbon before hitting the sack, see if that helps.

Taking a look at your symptoms....I don't have the answer but am wondering if (oh...for joy) you may have multiple problems. The first clue points maybe to fuel control pressures going wacky. Have you checked the cold and warm control pressures at the WUR? This a person can and should do with bourbon in hand in the garage. Of course, the "hunting" when colder outside might just indicate the need for a minor adjustment to the mixture, now that it's colder.

Will she start at all now, or is she completely dead? Hopefully the latter (it's easier to start with a totally dead car, vs. trying to troubleshoot some nepharious gremlin that raises his ugly head only once in awhile). The next time it happens (dies and won't start) do yourself a favor: slap a timing light on the coil wire, crank her over and see if you're getting any indication of spark. That will answer 50% of the equation anyway and hopefully narrow it down. Fuel or spark, spark or fuel....which is it?
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Old 01-04-2011, 11:25 AM
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