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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E36 (1991 - 1999)

E36 (1991 - 1999)
The E36 chassis 3-Series BMW was a huge hit among driving enthusiasts from the first moment the car hit the pavement. The E36 won numerous awards over the years it was produced and is still a favorite of many BMW enthusiasts to this day! -- View the E36 Wiki

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  #1  
Old 02-23-2015, 02:46 PM
LoganCollinsBMW LoganCollinsBMW is offline
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Idle/stall

Hello, today I went to start my 98 318i. It's been sitting about 2 weeks in 15-25 degrees Fahrenheit. Started great but would stall after a rough idle and some jumping around, in high rpm the car is fine. But it drops to idle and then jumps and stalls. Even if I let the clutch out (in neutral) it stalls! Help please!!!
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Old 02-23-2015, 03:27 PM
hnaz hnaz is offline
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Sounds like a vacuum leak or clogged breather hose.
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Old 02-23-2015, 03:28 PM
LoganCollinsBMW LoganCollinsBMW is offline
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I've read some other stuff about the vacuum leaks. It ran great when parked?
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Old 02-23-2015, 10:39 PM
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hornhospital hornhospital is offline
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It ran great, but now won't idle. Did it happen to "sneeze" when you cranked it the first time after it sat? Because this really sounds like it blew a vacuum line off somewhere. Typical problem in cold weather. The hoses get stiff and don't grip the attachment points as well. All it takes is a little backfire to pop off a hose and your idle goes to heck.
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Old 02-23-2015, 10:46 PM
LoganCollinsBMW LoganCollinsBMW is offline
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Not sure if it did when I started but it for sure does it when I start it now, if it was a vacuum line would it run rough all the time or just low rpm?
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Old 02-24-2015, 11:09 AM
LoganCollinsBMW LoganCollinsBMW is offline
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Come on guys, in desperate need of some help. Please and thank you!
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  #7  
Old 02-24-2015, 11:48 AM
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dc_wright dc_wright is offline
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Quote:
Originally Posted by LoganCollinsBMW View Post
Not sure if it did when I started but it for sure does it when I start it now, if it was a vacuum line would it run rough all the time or just low rpm?
Depends on which line, but you're most likely to notice it at idle. Once you get the revs up you might be down on power a bit, but it would run fairly smooth, again depending on which hose connection. Has it been wet out as well? Could be plug wires or coil pack too.

When you drive it does it take off OK or is it really down on power?
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Last edited by dc_wright; 02-24-2015 at 11:52 AM.
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Old 02-24-2015, 11:54 AM
LoganCollinsBMW LoganCollinsBMW is offline
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You almost have to floor it, has no power at all. It has been snowing and about 10 degrees Fahrenheit.
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Old 02-24-2015, 12:20 PM
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dc_wright dc_wright is offline
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Quote:
Originally Posted by LoganCollinsBMW View Post
You almost have to floor it, has no power at all. It has been snowing and about 10 degrees Fahrenheit.
Could be a major vacuum leak, a seized fuel pressure regulator, condensation in the coil pack, or the plug wires. If it was an M50 or M52 engine I'd throw a frozen oil separator in there too.

This is a more remote possibility, but when was the last time the fuel filter was changed? Over time, condensation can collect in the fuel filter and with prolonged cold weather it can freeze and cause a flow restriction.

In other words, lots of things can happen on a 20 year old car when it sits in below freezing weather for a couple weeks.
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Old 02-24-2015, 12:34 PM
LoganCollinsBMW LoganCollinsBMW is offline
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I just recently bought the car and put about 1,000 miles on her. As soon as I got the car I changed all fluids. (Oil, antifreeze, etcetera) I have saved up enough for plugs, coils, and plug wires. How could I check for vacuum leaks?
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