Hello guys!

My 1994 850 manual. non turbo is a nice clean sweetheart with a pampered 240k miles. just lately, after a longer, say 30 minute drive in the hot 105 degree texas heat, the car shuts off by itself when you get to an area where you need to decrease your speed or rpm. Then, when you turn the car on again, the engine runs a tad rough and the oil lights starts fLickering. after you leave the car alone and let it cool down for say 30 minutes the problem goes away and the car starts acting normally again. This problem just recently started happening when the temperature in austin is unbearable. im thinking it has something to do with heat, but my temp needle shows on halfway and the car seems happy and not overheating. oil pressure is ok also I think... There is plenty of oil shooting up when I open the oil cap at idle anyway... This SAME EXACT scenario has happened twice today...

Do you fine folks have any insight into what the problem could be? My 240 is currently being painted and my wife and I are sharing the 850. it would suck to be down to zero cars. can you guys help?



I really appreciate the help!!

 

what is your fuel pressure? and what weight of oil are you running?

 

Do you have any oil leaks?

Possible PCV? Crankcase pressure getting to high?

 

I just noticed that the vacuum line going to the fuel pressure regulator was cut... I replaced it just now.. would that cause this problem?

 

It's a miracle the car was running at all.

 

Thanks for the reply, I'm running a mix of 10-40 and 20-40 oil... makes it 15-40 I suppose... I don't see any oil leaks anywhere... Car's engine is dry as a bone. Even at idle, when you open the oil cap, oil shoots out like nobody's business, with zero blow-by... I can't imagine the oil pump is bad.

 

How do you mean? Also, "Was" implies that it does not run anymore... She starts right up and acts normally now, but if you were to recreate the scenario I mentioned, she will do the same thing.

 

Also, one thing I forgot to mention in the original post, if you rev the motor when the oil lights comes on and starts flickering, the oil light will go away and the car will run smoothly til you let your foot off the accelerator.

 

You had a giant vacuum leak and essentially no fuel pressure regulator.

 

Ahh I see... my apologies, I thought you wrote that before my post about the FPR. Cheers.

 

does it run better now that you fixed the fpr vacuum line? The oil blowing out the cap sounds like a blocked PCV system to me.

Sounds to me as if you may have had 2 separate problems, and with fixing the vacuum line, you have addressed ONE of them. Check that PCV - pull the oil dipstick up a little bit and see if smoke comes out of it. if it does, replace the PCV and your oil issues should go away as well.

 

Yes.. there IS a bit of smoke coming out of the oil dipstick tube. When we say pcv, are we talking about the flametrap? rather, where is the darn pcv valve on this car?

 

Maybe I was misunderstood, theres no oil blowing out of the cap, I was just saying that if you were to open the oil cap up when the car is running, you will see oil popping up out of it, indicating, to me, that there is at least enough oil pressure at idle to reach that area...

 

yes, pcv = flametrap. The hose that you see running up from under the intake manifold that attaches under the spark plug cover is part of it. The flame trap itself is under the intake manifold, which you need to remove to replace the PCV system on this car.