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E34 (1989 - 1995)

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  #1  
Old 02-23-2015, 09:05 PM
greyyegg greyyegg is offline
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Mein Auto: 1995 BMW 540i
Terrible idle

Just yesterday I was driving and then all of a sudden my car started shaking, and then I turned it off and back on and the check engine light came on.
The exhaust smelled like gasoline and when it warms up it shakes like crazy. I turned it on again this morning and the CEL wasn't on, but it's still running very badly and when I press on the gas it shakes and does small jumps when its moving.
Anyone know what could be the cause?
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  #2  
Old 02-23-2015, 09:54 PM
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Mein Auto: 1990 BMW E34 525i
Every time the car has been running rich for me it has these symptoms. Good luck.
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  #3  
Old 02-23-2015, 10:15 PM
greyyegg greyyegg is offline
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Quote:
Originally Posted by greyyegg View Post
Just yesterday I was driving and then all of a sudden my car started shaking, and then I turned it off and back on and the check engine light came on.
The exhaust smelled like gasoline and when it warms up it shakes like crazy. I turned it on again this morning and the CEL wasn't on, but it's still running very badly and when I press on the gas it shakes and does small jumps when its moving.
Anyone know what could be the cause?

Dang, yeah it has been running rich
And I got the code P0300
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  #4  
Old 02-23-2015, 10:26 PM
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sixpot_simon sixpot_simon is offline
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Next step is to check the spark plugs. If you don't know how to read them, post up photos and we'll help. Keep track of which cylinder each plug came from.

(my "random stab in the dark" guess is a faulty ignition lead)
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  #5  
Old 02-23-2015, 10:27 PM
Alpina535I Alpina535I is online now
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Wat year? You have a vacuum leak somewhere or if coiled one is bad or bad plugs or plug wire. Type of e34?

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  #6  
Old 02-23-2015, 11:32 PM
TexHun TexHun is online now
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Do the stomp test and get codes off the car itself. http://www.bimmerfest.com/forums/sho...65#post5936965 Instructions on how to do it if you dont know already.
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  #7  
Old 02-24-2015, 01:10 AM
Alpina535I Alpina535I is online now
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I didnt think e34's codes appeared like OBD2 codes. P0300 is random misfire. Could be a grip of things.

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  #8  
Old 02-24-2015, 07:43 AM
wilson6k wilson6k is offline
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Mein Auto: 1994 E34 530i
I had an issue similar to this and broken vanes on my fan blade. I think the shaking was more than an uneven spin. I am experiencing the same issues, but check for the vacuum leaks first, spark plugs and what not, but also the socket or seats themselves.
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  #9  
Old 02-24-2015, 07:48 AM
greyyegg greyyegg is offline
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Well I recently had my spark plugs replaced. I might check my fuel injectors and ignition could next cause it also turns and misfires a couple times sometimes on start up.
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  #10  
Old 02-24-2015, 08:56 AM
wilson6k wilson6k is offline
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post a video. It may be what I am experiencing... but I am sure the geniuses on this forum could tell you what's up.
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  #11  
Old 02-24-2015, 09:04 AM
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I trust you checked already, but water in the plug valleys will cause all of the above. Even a small amount if your coil boots are cracked at the ends at all.
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Ongoing comparison between two E34 540ia's

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  #12  
Old 02-25-2015, 04:15 AM
paul1733 paul1733 is offline
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Hopefully it isnt a nikasil lined engine, but something simple like CTS or 02 sensor.
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  #13  
Old 02-25-2015, 05:42 AM
greyyegg greyyegg is offline
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My car has the Alusil engine block. I'm changing my O2 sensors out to find out if that is the problem tomorrow when I get more time.
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  #14  
Old 02-25-2015, 03:04 PM
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sixpot_simon sixpot_simon is offline
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Quote:
Originally Posted by greyyegg View Post
Well I recently had my spark plugs replaced.
Reading the plugs isn't just about whether the plugs themselves are ok. It tells you if cylinders are running lean (likely a fuel problem) or rich (ignition problem). It is usually more cost effective than throwing random parts at the car.

Last edited by sixpot_simon; 02-25-2015 at 03:05 PM.
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  #15  
Old 02-25-2015, 03:43 PM
greyyegg greyyegg is offline
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So since my car is running rich it would have to be something that deals with ignition like the coils or injectors?
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  #16  
Old 02-25-2015, 03:50 PM
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You are 100% sure there is no water in the plug valleys right? Have you tried running your car in a completely dark garage with the coil valley covers off? A water mist/spray bottle would be helpful too if there is a spark jumping, you'll see it.
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1995 E34 540ia
160,000 Miles
VIN# ...GF32404
Hellrot Red

Fuelly

My Basic Repair History (Edited 1/27/2015)

Ongoing comparison between two E34 540ia's

OBC4 Hidden Functions : Link 1, Link 2
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  #17  
Old 02-25-2015, 03:55 PM
greyyegg greyyegg is offline
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So I just take the covers over the ignition coils off and spray must whilr the cats running to check for what?
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  #18  
Old 02-25-2015, 04:03 PM
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TheEinstein TheEinstein is online now
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You mist water down into the plug valleys, while the car is running, looking for sparks that are jumping to the block/head from the coil/boots. Again, you know for sure it has no water down in the valleys? It wouldn't take a teaspoon of it if your boots are old. Hell, even leaky head gaskets dropping oil down there can give misfires due to the spark not going to plug. At least, it's what I suffered, and what inevitably forced me to do my valve cover gaskets. I'm saying literally any time it rained, if I didn't keep my engine hot enough to boil off the water as fast as it came, I would be spewing unburnt fuel, and the car would be shaking violently.

The water mist is nothing but an aid for controlled misfire if you have bleeding boots.
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1995 E34 540ia
160,000 Miles
VIN# ...GF32404
Hellrot Red

Fuelly

My Basic Repair History (Edited 1/27/2015)

Ongoing comparison between two E34 540ia's

OBC4 Hidden Functions : Link 1, Link 2

Last edited by TheEinstein; 02-25-2015 at 04:04 PM. Reason: Edit..
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  #19  
Old 02-25-2015, 04:13 PM
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BMWFatherFigure BMWFatherFigure is offline
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Do the water/oil checks around the plugs and if thet is OK then get the injectors rig cleaned and tested and change the fuel filter. Maybe you have an injector jamming open/leaking.
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  #20  
Old 02-25-2015, 04:18 PM
greyyegg greyyegg is offline
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I changed my valve cover gaskets about 3 months ago and it was fine. But my boots might be cracked and something leaking in is what I'm thinking, since they are pretty old. IM going to have my ignition coils checked to make sure it's not those and next step would be the fuel injectors.
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  #21  
Old 02-25-2015, 04:28 PM
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I should have added; and what inevitably forced me to change my coil boots. The original ones looked pretty good to me, tiny micro cracks around the end that first meets the plug ceramic. Honestly did not know how bad they were until I installed the new ones and experienced how tightly they seal to the plugs. WD-40 (Water-Displacement-Formula-40) is your friend in there also. I spray the boots and plugs, then put dielectric grease just on the tips of the rubber (insert that's what she said jokes here) that contacts the plugs for future ease of removal. I'm not suggesting you don't have a stuck injector, but replacing these = basic maintenance (100,000 mile wise) from what I understand.

Coils are pretty easy IMO, just a simple resistance check. Little more than that and a physical observation of seeing the spark happen can be done with those. But I'm telling ya, if you have no idea when or if the boots have been changed.. Knowing what I've experienced, I'd change them no matter what. Got mine off Rock Auto for like $6 or less a piece. Haven't had an issue like you're describing ever since.
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1995 E34 540ia
160,000 Miles
VIN# ...GF32404
Hellrot Red

Fuelly

My Basic Repair History (Edited 1/27/2015)

Ongoing comparison between two E34 540ia's

OBC4 Hidden Functions : Link 1, Link 2
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  #22  
Old Yesterday, 04:44 PM
greyyegg greyyegg is offline
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Wow well 4 of my ignition coils were bad and the spark plugs were fouled.
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  #23  
Old Yesterday, 05:42 PM
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sixpot_simon sixpot_simon is offline
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4 coils failed simultaneously out of the blue? That's very strange.
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  #24  
Old Yesterday, 06:22 PM
greyyegg greyyegg is offline
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Yeah, my check engine came on and the car was shaking like crazy. They are the bremi ignition coils. So I just went ahead and ordered 8 Bosch coils and 8 ngk spark plugs
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