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E34 (1989 - 1995)

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  #1  
Old 11-25-2012, 05:36 AM
mark cherry mark cherry is offline
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Question virgontour

1989 5 series e34 3.4 engine automatic..... very sluggish off the start , any tips to improve this .....
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  #2  
Old 11-25-2012, 05:50 AM
robertobaggio20 robertobaggio20 is offline
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Ok lets start with what you have done or checked recently so far, please list that here.

And do take a look at the relevant table here as well :

http://www.bimmerfest.com/forums/sho...d.php?t=658957
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  #3  
Old 11-25-2012, 07:13 AM
snowsled7 snowsled7 is offline
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Manual gearbox, lower rear differential ratio, sell it and buy a V8

The engines 4200 rpm torque peak and the transmissions 2000 rpm stall speed will never conspire to give you aggressive off the line acceleration.
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  #4  
Old 11-26-2012, 01:33 AM
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Service it properly, tune it correctly. If it's still too slow for you - bigger engined BMW here you come.
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  #5  
Old 11-26-2012, 03:21 AM
Ssuss34 Ssuss34 is offline
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Push your foot down harder.
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  #6  
Old 11-28-2012, 05:56 PM
mark cherry mark cherry is offline
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im ready to cut a hole behind accelerator pedal to get more get up and go ..lol
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  #7  
Old 11-28-2012, 06:02 PM
mark cherry mark cherry is offline
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ok... nothing has been done to engine all stock.... was sort of asking what direction would i start at without spending $$thousands$$ like a few of the lads have
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  #8  
Old 11-28-2012, 07:10 PM
Josh429er Josh429er is offline
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These motors really don't respond to upgrades. If you think It's slow It's because It's behind on maintaince somewhere. Also second and third is where mine shines. 1st is just to big to for being quick. Just takes to long to get to 3.5k and up, where it signs.
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  #9  
Old 11-28-2012, 08:01 PM
robertobaggio20 robertobaggio20 is offline
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Quote:
Originally Posted by mark cherry View Post
1989 5 series e34 3.4 engine automatic..... very sluggish off the start , any tips to improve this .....

First time i have heard that a 3.5litre is sluggish. Please get your car's codes scanned. Something is clearly wrong somewhere. Might be your air flow meter.

Last edited by robertobaggio20; 11-29-2012 at 04:47 AM.
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  #10  
Old 11-28-2012, 11:29 PM
Josh429er Josh429er is offline
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Agreed, It's not fast but it moves.
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  #11  
Old 11-29-2012, 09:06 AM
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tune-up

"the car ran fine for 20 years! how after 4,567,092 miles would it become sluggish?!"
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  #12  
Old 11-29-2012, 09:11 AM
Josh429er Josh429er is offline
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"My car ran fine for ten years, how after 9 years of no oil change would it now be sluggish" - first or second owner to my car
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  #13  
Old 11-29-2012, 09:30 AM
robertobaggio20 robertobaggio20 is offline
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Quote:
Originally Posted by Josh429er View Post
"My car ran fine for ten years, how after 9 years of no oil change would it now be sluggish" - first or second owner to my car
Someone actually told you this ? Which oil was he referring to, or was he talking about everything ?

Perhaps lifeguard would be able to go the distance for a transmission, but not engine oil. Surely the engine would have fallen apart long before that.
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  #14  
Old 11-29-2012, 09:29 PM
Ssuss34 Ssuss34 is offline
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Funnily enough, I now know what you mean by "sluggish". I also have a 535, Last week i'd floor the accelerator and it would have great acceleration and rev high up into 1st gear then change to 2nd gear. Now, for some unknown reason, I floor the accelerator and it feels like its starting in 2nd gear and takes forever to rev out and I have not done anything to the engine. TELL ME HOW TO FIX IT
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  #15  
Old 11-30-2012, 10:37 AM
robertobaggio20 robertobaggio20 is offline
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Reset your transmission. Delete all error codes. Unclamp your tcm and ecu for a few minutes. Then take the car for a test drive.
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  #16  
Old 12-01-2012, 06:19 AM
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BMWFatherFigure BMWFatherFigure is offline
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or remove the battery leads at the terminals and join the cables together
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  #17  
Old 12-01-2012, 06:41 AM
robertobaggio20 robertobaggio20 is offline
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Quote:
Originally Posted by BMWFatherFigure View Post
or remove the battery leads at the terminals and join the cables together
This idea of joining the cables together has to do with the notion that there is some balance electrical charge left in the system due to the presence of capacitors. And, as long as there is a balance charge, the existing error codes are kept alive and undeleted on the system.

To get rid of this capacitance, I used to recommend that the ignition be key2ed following removal of the ecu clamp, in the effort to delete error codes.

I'm not so sure that it works this way. Could someone with a code reader confirm ? Its easy to create a code...just disconnect the afm while the engine is running.

Last edited by robertobaggio20; 12-01-2012 at 06:43 AM.
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  #18  
Old 12-01-2012, 08:21 AM
Josh429er Josh429er is offline
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No it was a joke to the previous statement and the fact my 535 was horribly maintained before me. The diff oils probably at 9 years however hahaha
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  #19  
Old 12-01-2012, 08:33 AM
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luckydog luckydog is offline
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i found that adjusting the linkage at the throttle body eliminated most all of the hesitation in accelerating on my 20 YO BMW.
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  #20  
Old 12-01-2012, 04:05 PM
robertobaggio20 robertobaggio20 is offline
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Quote:
Originally Posted by mark cherry View Post
1989 5 series e34 3.4 engine automatic..... very sluggish off the start , any tips to improve this .....
Mark, what does "virgontour" mean ?
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  #21  
Old 12-01-2012, 04:52 PM
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_Ethrty-Andy_ _Ethrty-Andy_ is offline
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is it missfiring at all?
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E34 V12 Project Thread Here: http://www.bimmerfest.com/forums/sho...=502437&page=4
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