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#1
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Annoying Jolt / Slam when accelerating
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
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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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04 X5 3.0i auto 03 X5 4.6is |
#3
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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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Current: 2004 X5 4.8is - Le Mans blue/Cream beige 1994 E31 850CSi - Sterlingsilber Previous: 1987 BMW E28 M5 - Delphin-metallic 1976 BMW E3 3.0Si - Arctic-metallic |
#4
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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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2006 Infiniti G35 2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD Lotus Europa 1970 Destroyed by fire Lotus Europa 1970 S2 Renault Powered Lotus Type 52 1970 Twincam Webers Powered PORSCHE 911 Targa 1982 The Garage Queen Audi Avant donated to Kars for Kids BMW 525IT Sold Audi 4000CS Quattro Sold Jensen Healey Lotus Powered Sold Opel 1900 Sold Triumph Spitfire 1971 Sold Triumph Spitfire 1968 Sold Plymouth "Cuda" 340 Six pack SOLD |
#5
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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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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior Dallas |
#6
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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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2010 E93 M3 - Le Mans Blue 2010 E70 X5M - Alpine White 2016 F15 40e - Imperial Blue |
#7
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Engine mount, Transmission mount.
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#8
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Quote:
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2006 Infiniti G35 2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD Lotus Europa 1970 Destroyed by fire Lotus Europa 1970 S2 Renault Powered Lotus Type 52 1970 Twincam Webers Powered PORSCHE 911 Targa 1982 The Garage Queen Audi Avant donated to Kars for Kids BMW 525IT Sold Audi 4000CS Quattro Sold Jensen Healey Lotus Powered Sold Opel 1900 Sold Triumph Spitfire 1971 Sold Triumph Spitfire 1968 Sold Plymouth "Cuda" 340 Six pack SOLD |
#9
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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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_________________ David 2005 4.4i Sport 1986 Porsche 911 |
#10
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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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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior Dallas |
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