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  #1  
Old 06-07-2013, 07:41 PM
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Weird Hesitation at Steady Speed

Heya,

I recently bought a 2002 X5, which I'm absolutely in love with. It's a fantastic car.

I am experiencing a weird problem, though. I notice it most often in town, at around 30mph, when the revs are around 1500, it hesitates slightly. The needle drops about two widths of the needle, and then bounces back. Everyone in the car feels it. When it's doing this, it almost feels like I'm driving on cobble stones.

When I accelerate or decelerate, it stops. I've noticed it on the highway around 2000 RPMs as well.

It almost feels to me as though the transmission is "thinking about" shifting and then changing its mind. But it might not be transmission related at all.

Any help would be appreciated.

Thanks!

-Steven
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  #2  
Old 06-07-2013, 08:04 PM
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check guibo for disintegrtion... (vibration/cobble stones)

check the coils/plugs for misfiring (needle dropping)

welcome to the forum... how about pictures??

another thing, there were several versions of the X5 in 2002, all behaving differently under similiar situations... it would pay off to let other folks know what model you have, such as the engine... also helps to state the current mileage, as various systems last for various amounts of use/time...

what is your level of technical expertise?

0 - i let the gas station attendant fill up the car, as i have no idea how to

10 - let me have this GE jet-propulsion engine, i will take it apart and put it back together with my eyes blindfolded and just one screwdriver in my hands... lol...

well... you get the idea...
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E53 X5 4.6iS
147K mi - Sold May 2013
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E53 X5 4.8iS built 2005-10-17
66200 mi - June 2012
96000 mi - June 2013
112000 mi - June 2014
OEM fire extinguisher
OE first aid kit
OE tow hitch
OE TV module
OE aspheric mirror
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black/white badges
rear camera
4-channel video recorder

Here is the list of things I have done to the X
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  #3  
Old 06-07-2013, 08:27 PM
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Ah, thanks. Sorry I didn't clarify more: it's a 4.4i with 188k miles.

As for technical capability, I'm probably a 5-6. I'm pretty handy, and have reasonable troubleshooting skills. I work on my old British cars myself. I find newer cars are a bit overwhelming sometimes, though, but it's probably just the perception of complexity.

What was I thinking not posting pictures?
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  #4  
Old 06-07-2013, 08:34 PM
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I should have added: the hesitation/pulsing is *very* subtle. It sure feels like transmission, but a slightly bad guibo could explain it. Would the guibo cause the hesitation *and* the slight drop in RPM?
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  #5  
Old 06-07-2013, 08:37 PM
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nice... very nice...

consider investing into a USB-OBD2 cable and the goodies for your laptop... comes very handy for initial diagnosys, when a weird light pops on the dash... read through the forum, look for INPA... with INPA you can find the misfire, that little hesitation... if that is a misfire... could be air related - did you check the airfilter?

raise the car up, loook for a rubber "pillow", octagonal in shape, that is a guibo... should be sandwiched on the drive shaft... try to actually touch it, as to the eye it may look ok, but all cracked up to the touch... may give you the cobble stones...

if you had INPA, you could see the "roughness" of the engine while in motion, that is how i detected the misfiring cyl 5 - coil was bad... however, after so many misfires, the check engine light set the code for cyl 5...
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Old 06-07-2013, 08:39 PM
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check these screenshots for the INPA screens...

http://www.xoutpost.com/936202-post100.html
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  #7  
Old 06-07-2013, 08:47 PM
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I've seen a lot of USB-ODB2 packages; specifically the PASoft one. Is there a specific package you'd recommend?

I'm not getting any lights on the dash, just the behaviour. I will post a video of it happening from my phone tomorrow.
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  #8  
Old 06-07-2013, 08:51 PM
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i was not gettig check engine light for a while, even though it was obvious, something was not right... at one point, as i was pushing the car rather hard on the uphill, that hesitation (might not be same as yours) did set off the light...

go to fleabay, search for INPA, there will be a few offers... one comes from romania - many had good experience with the guy... you need a laptop with Win XP, even though it seems to be working with the VISTA...

it is always nice to see what is going on inside the car, like the oil temp, coolant temp on small and big loops... live...
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  #9  
Old 06-07-2013, 09:37 PM
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As suggested check the guido first.

If that is not bad, to address this issue now I would go to an independent BMW focused shop and have them run a diagnostic test to see if the computer is showing any fault codes. There will be a fee but it will not obligate you to having them do any repairs.

Usually the feeling of a misfire at a certain rpm is there all the time, it is just more apparent at a low rpm in a high gear. If it is engine related there is some simple/easy troubleshooting you can do. Do each step and see if it goes away before next step. Start with the air filter, if it is dirty or you don't know how long it has been there, replace it. Next disconnect the Mass air flow sensor and see if the idle changes. If it doesn't you need a new MAF. You can try cleaning it by removing it and spraying the wires with MAF cleaner but that doesn't always work and never seems to fix it for very long. The wires on the 'inside' are the important wires. Next is to check for a vacuum leak. Remove the engine cover and take a spray can of brake cleaner and spray the engine vacuum lines. Also spray each injector. If there is a vacuum leak the engine idle will change. Best to spray in an open area and when the engine is cold. Next I would check the coils/injectors. If you have an auto stethoscope put the point on each injector. If the coil and the injector are good you will hear a crisp clicking noise. If not, you will hear a softer dull sound. Next is to pull the plugs and see if the electrodes are all the same color. If not, it could be the plug, the wire, the coil or injector. Next, If you don't know how old the fuel filter is--replace it. At this point you have done a quick check of the basics of air flow, fuel flow and spark quality. Good luck!
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  #10  
Old 06-08-2013, 04:12 AM
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Mine had similar symptoms ( when I had it ) it was the EGR valve that needed replacing, mine was a diesel however, not up on the petrol p/pants.
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