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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E30 (1982 - 1993)

E30 (1982 - 1993)
God's Chariot. The E30 was produced primarily from 1982 through 1991. The cabriolet was the one exception which was produced through 1993.

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  #26  
Old 03-05-2012, 08:42 AM
OliverM3 OliverM3 is offline
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Day Two I drove about 30 miles all back roads on Sunday and the car didn't hesitate at all.

So I decided to take it to work today and sure enough about 10-15 minutes in to the drive in the morning and
I had severe hesitation that would only go away when I floored the pedal.
problem cleared again after a minute or two and didn't return for the 40 mile commute.

Back to the drawing board.
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  #27  
Old 03-05-2012, 05:00 PM
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  #28  
Old 03-05-2012, 05:19 PM
OliverM3 OliverM3 is offline
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5sp of course
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  #29  
Old 03-05-2012, 06:07 PM
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i wonder what your timing is.
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  #30  
Old 03-05-2012, 09:39 PM
stairwayto7 stairwayto7 is offline
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Stay at it!
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  #31  
Old 03-06-2012, 05:34 AM
OliverM3 OliverM3 is offline
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Quote:
Originally Posted by downhiller View Post
i wonder what your timing is.
I wouldn't think that timing would be an issue since I just replaced the belt a couple months ago and everything is dead on. And the timing isn't adjustable. Also it only hesitates for a minute or two and then never returns till you let the car cool down overnight and drive it again.
Also being cold is a strange symptom because it's fine when you first start it cold.
10-15 minutes in to driving it will hesitate for a minute or two requiring full throttle then it will never do it again until the car is stopped and shut off for the night.

I'm still leaning toward the C191 connector and harness.
When I first bought the car I had a surging idle, temp gauge would bounce around constantly and the car would not restart if you shut it off after it warmed up. Also a CEL light for temp sensor even though I replaced both the blue and brown sensor.
All of those problems were corrected by sand blasting the C191 connector with baking soda to clean off the connections.

I'll see in a couple weeks I special ordered the male C191 to the injectors harness lets hope it's not the female end that's giving me the problem.
But I figure with brand new bullet connectors on the male end that may give me a better connection than my 25 year old one.

One thing does worry me a little when I give it throttle my temp gauge needle moves a little. Kind of like a tachometer only a mm or two. I hope voltage from the injectors isn't bleeding over somehow to the sensor.
I'd hate to have to rewire the entire engine.
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  #32  
Old 03-06-2012, 05:58 AM
OliverM3 OliverM3 is offline
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Quote:
Originally Posted by stairwayto7 View Post
Stay at it!
Yeah two much time invested.
I just finished the interior new reupholstered heated front seats. that was fun wiring job!
new rear reupholstered seat M style with the armrest.
Also went with the Tech II steering wheel it feels so much better than the Tech I
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  #33  
Old 03-08-2012, 05:45 AM
OliverM3 OliverM3 is offline
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I have a new observation this morning.

The hesitation always occurs when the temperature gauge comes up to the running temperature.
I'm wondering if it has anything to do with when the car switches to closed loop?
or does that happen way before full operating temperature?
I'm under the impression that when you floor the gas pedal it takes the car out of closed loop so this would make sense because the car returned to normal when the gas pedal is to the floor.

I just replaced my O2 Sensor recently even though I wasn't getting a CEL light so I don't know what else could be messing with closed loop operation if that is the problem.
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  #34  
Old 03-08-2012, 05:06 PM
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if i remember correctly, the ecu does that when it reaches a certain temp, i think somewhere around 140 degrees. so there is temp sensors, the o2, and the ecu are the big things. i believe (and self taught) that going from open to close loop is the open time span of the injectors
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  #35  
Old 03-08-2012, 06:38 PM
OliverM3 OliverM3 is offline
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Quote:
Originally Posted by downhiller View Post
if i remember correctly, the ecu does that when it reaches a certain temp, i think somewhere around 140 degrees. so there is temp sensors, the o2, and the ecu are the big things. i believe (and self taught) that going from open to close loop is the open time span of the injectors
140 would probably be sooner then it's actually happening it's at full temp before I experience anything.
This is a bizarre problem the car runs so good except for the 10/15 minute mark hesitation I was having a blast ripping around today on the way to and from work.
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  #36  
Old 03-08-2012, 08:40 PM
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how long does it take for the engine to start after it sits for the night? 1-2 seconds or longer
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  #37  
Old 03-09-2012, 05:58 AM
OliverM3 OliverM3 is offline
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Quote:
Originally Posted by downhiller View Post
how long does it take for the engine to start after it sits for the night? 1-2 seconds or longer
I would say 2-3 seconds to start it's not as fast as my newer cars but not excessive.
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  #38  
Old 03-09-2012, 09:41 AM
Pennyw1se Pennyw1se is offline
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Did you ever swap ECUs like you stated earlier you would? I'm leaning towards that or a bad wiring harness.

Good luck. Sounds like you are resolved to kick this gremlin in the nads.
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  #39  
Old 03-09-2012, 11:15 AM
OliverM3 OliverM3 is offline
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Quote:
Originally Posted by Pennyw1se View Post
Did you ever swap ECUs like you stated earlier you would? I'm leaning towards that or a bad wiring harness.

Good luck. Sounds like you are resolved to kick this gremlin in the nads.
I have not yet.
The harness is back ordered so I'm waiting till that arrives before going to the ECU.
I may pop it open though and see if there are any cracked solder joints or any water damage.
I know these are known for leaking on the ECU.
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  #40  
Old 03-10-2012, 05:56 PM
OliverM3 OliverM3 is offline
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Well I just pulled the DME I don't think that's the problem it has a 2009 date and I popped the cover and I don't see any obvious signs of damage like water spots or cracks in the solder joints.
but I guess the rebuild could have been bad so I guess it's a possibility.

Last edited by OliverM3; 03-11-2012 at 02:28 PM.
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  #41  
Old 03-10-2012, 08:20 PM
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no image. what if air is somehow getting into the fuel line, and after it goes into closed loop, the small air pockets within the fuel filter go and cause the hesitation. ive been thinkin about that for awhile. it falls right in the time span.
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  #42  
Old 03-17-2012, 04:41 PM
OliverM3 OliverM3 is offline
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One day with the new injector harness so far so good.
But this wouldn't be the first full day that had no hesitation.
I'll have to take it for a spin early tomorrow morning.


I think the car may have something against work because when I take it to work it always happens
could be temperature related though since I leave at 6am so it's colder out.

Last edited by OliverM3; 03-17-2012 at 04:42 PM.
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  #43  
Old 03-17-2012, 05:26 PM
HooseM3 HooseM3 is offline
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my 01m3 is doing the samething

I have a 2001 M3 it started that same thing yesterday I thought I was running out of gas so I pulled in and put gas in it and oh did it get bad my car wont hardly move but if you if you try to give it the pedal it will die if you know anything help out its like it has water in the gas of the fuel pump is going out
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  #44  
Old 03-18-2012, 02:37 PM
OliverM3 OliverM3 is offline
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Quote:
Originally Posted by HooseM3 View Post
I have a 2001 M3 it started that same thing yesterday I thought I was running out of gas so I pulled in and put gas in it and oh did it get bad my car wont hardly move but if you if you try to give it the pedal it will die if you know anything help out its like it has water in the gas of the fuel pump is going out
Maybe someone else can chime in? The e46 is a different animal compared to my problem.
I had a 2003 M3 I didn't have a single problem so I never really had to trouble shoot the car.
Fuel pump would be my guess if there's no check engine light.
A coil pack going bad runs like complete crap but that usually throws a CEL.

So far so good with my new injector harness I haven't had any hesitation.

Last edited by OliverM3; 03-18-2012 at 02:38 PM.
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  #45  
Old 03-21-2012, 06:20 AM
OliverM3 OliverM3 is offline
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Well scratch the injector harness I drove the car to work today and I had the same hesitation at the same spot.
I even woke up early on Sunday and tested the car on the same route to work and it was fine but today it hesitated like clock work.

I guess the DME could be the next target to replace.

I have to say this is the most difficult problem I have encounter with any of my cars and I've had
a lot of cars in my 28 years of driving.
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  #46  
Old 03-21-2012, 01:47 PM
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what if moisture is getting into the connector?
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  #47  
Old 03-21-2012, 02:06 PM
Pennyw1se Pennyw1se is offline
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Have you tried checking the fuel pressure while driving to see if there is a cut off when its bogging down?
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  #48  
Old 03-21-2012, 06:04 PM
OliverM3 OliverM3 is offline
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Originally Posted by downhiller View Post
what if moisture is getting into the connector?
brand new harness with a garage kept car that only drives on sunny days.
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  #49  
Old 03-21-2012, 06:12 PM
OliverM3 OliverM3 is offline
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Quote:
Originally Posted by Pennyw1se View Post
Have you tried checking the fuel pressure while driving to see if there is a cut off when its bogging down?
I have not I figured with the new fuel pump, filter, injectors, harness and regulator it wouldn't be a fuel issue.

I guess I could buy a fuel pressure gauge and test it.

Strange that it goes away and never returns till the next day though.

Also I don't understand why it would go away if I floor it if there was a problem with the fuel system? Shouldn't the lack of pressure affect the car when the pedal is all the way down?

I had hesitation both to and from work today.

Thanks for keeping the suggestions coming everyone I'm on a mission now I have to solve this.
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  #50  
Old 03-21-2012, 08:42 PM
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downhiller downhiller is offline
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Quote:
Originally Posted by OliverM3 View Post
brand new harness with a garage kept car that only drives on sunny days.
humidity happens all the time.

the biggest problem is the time it happens. try this, start the car, let it idle for 10 minutes then take it for a spin.
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