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  #1  
Old 07-29-2016, 07:43 PM
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Annoying Jolt / Slam when accelerating

Hi everyone, I recently purchase a 2004 X5 4.4 this year and it had transmisson problems and we had the transmisson rebuilt already.

couple months after the rebuilt transmisson when accelerating or past the "kick down point" the car would jolt / slam i would have to be going around 30 or 40 MPH then press down the gas and it would happen ( not everytime but quite often) if i slowly acceletate the problem does not happen and drives just fine.
there is also no engine lights or sevice lights on.

I never scanned it recently but going to soon I've read many of posts it could be the Mass air flow sensor that could be causing this im wondering if it safe to unplug the sensor to go for a small drive and see if the problem happens what is your guys ideas? thanks
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  #2  
Old 07-29-2016, 09:03 PM
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Yes it's ok to unplug the MAF and drive it a bit.

But I dont think that is the problem if I understand your situation correctly.
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Old 08-02-2016, 08:52 PM
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Does it do it when positive throttle is applied, or when you're slightly feathering the throttle?
My 6-speed tranny 'flares' and slams sometimes during acceleration from low speed (i.e. 2nd or 3rd gear) and only on a feathering throttle (i.e. beginning to back off).
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Old 08-02-2016, 09:52 PM
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Depends on what was rebuilt. Did they replace all the bushings in the valve body? Tested the solenoids and replaced any that didn't meet spec. Replace the clutch drums with improved clutch drums?

When they tore the trans apart did they find out why the trans needed to be rebuilt?
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Old 08-03-2016, 02:48 PM
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MAF is part of the air/fuel monitoring system. Will cause loss of power, rough idle, etc. Never had one that caused a "jolt". Does this jolt have a sound that goes with it?

I would take it to the shop that did the rebuild and have it diagnosed. Transmission symptoms can be deceiving, leave it to the experts. Doesn't it have a warranty?
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Old 08-04-2016, 12:54 PM
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FWIW, both my 4.4 and 4.8is have done this regularly in the time I've owned them. It's annoying as hell and occasionally feels like being rear-ended. I had the 4.4 pretty heavily investigated by an indie shop (Signature in Kirkland WA) and they couldn't find anything "wrong" with it. Adjusting my throttle technique eliminated the issue.
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Old 08-05-2016, 02:42 AM
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Engine mount, Transmission mount.
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Old 08-05-2016, 09:54 AM
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Quote:
Originally Posted by OrangeFurious View Post
FWIW, both my 4.4 and 4.8is have done this regularly in the time I've owned them. It's annoying as hell and occasionally feels like being rear-ended. I had the 4.4 pretty heavily investigated by an indie shop (Signature in Kirkland WA) and they couldn't find anything "wrong" with it. Adjusting my throttle technique eliminated the issue.
I guess when BMW boast about their adaptive transmission, people just assume that the transmission will adapt to their driving style and not the other way where you need to adapt to the quirks of the transmission.
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Old 08-05-2016, 10:15 AM
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Mine has a slam/jolt particularly when slowing down, but not quite stopping, then accelerating. It feels like a gear that has excessive backlash (too loose).
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Old 08-05-2016, 11:33 AM
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A jolt slowing down, accelerating is not normal, something is not right. Could be a number of causes. In Blackbeast's case the jolt was not there before the transmission was worked on. I always start with the premise there are no coincidences which means the problem was caused by the shop.
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