pajero vibration

Submitted: Monday, Feb 25, 2008 at 17:50
ThreadID: 54924 Views:7892 Replies:6 FollowUps:8
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Hi....01 pajero 3.5ltr petrol v6....i fitted a timing belt and spark plugs to vehicle last week,test drove it and all was ok...this week i see the car again and customer mentions a vibration at times.Upon test drive i found a vibration in the whole vehicle when cruising at approx 40kph,but only happens sometimes.i.e: once every 5 kilometers or so,and for about 10 seconds.If i knock the automatic into neutral when it vibrates the shudders stop.What the hell is going on?...customer says this didnt happen before the work i did.I didnt have vehicle raised on a hoist or do any work under the vehicle.It feels like when you drive over a cattle grid.The vibration comes through the body,not the steering wheel.Any ideas?
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Reply By: Dunaruna - Monday, Feb 25, 2008 at 18:34

Monday, Feb 25, 2008 at 18:34
How many Klm on the dial? I like to replace the plug leads at 100,000km, they seem to fail around 120,000/130,000. When you replaced the difficult 3 plugs you may have disturbed an already dodgy lead. Just a thought.
AnswerID: 289336

Follow Up By: Member - Davidp P (VIC) - Monday, Feb 25, 2008 at 21:10

Monday, Feb 25, 2008 at 21:10
sounds like transmission wind-up....crossed leads......ignition igniter but I dont know anything about the Paj ...the only other thing I can think of is gear box/engine mounts or drive shaft bearings and alignment , but I would then suspect condition of leads
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Follow Up By: Member - Davidp P (VIC) - Monday, Feb 25, 2008 at 21:12

Monday, Feb 25, 2008 at 21:12
are you sure the timing belt is not out by a tooth?
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Follow Up By: tuffygordon - Tuesday, Feb 26, 2008 at 10:47

Tuesday, Feb 26, 2008 at 10:47
Thanks Dunaruna...i just happen to have 120,000 klms on clock.So ,new leads is a good idea.Arnt they a cute spark plug arrangement!.....Damn ,i gotta go back in there.I also like the weak Rubber mount theory,But im unable to fault any of the mounts.The timing belt is definately on in correct spot (liquid paper marks just to be sure things went back the same way ).Hey,What is transmission wind-up? as mentioned by Davidp P.
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Follow Up By: Member - Davidp P (VIC) - Tuesday, Feb 26, 2008 at 11:19

Tuesday, Feb 26, 2008 at 11:19
? electrically actuated diff-locks??? just a thought
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Follow Up By: tuffygordon - Friday, Mar 07, 2008 at 12:24

Friday, Mar 07, 2008 at 12:24
yep,just been confirmed as a faulty torque convertor.approx $1500 to fix.cause of fault is still unknown.
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FollowupID: 556744

Reply By: Member - Oldplodder (QLD) - Monday, Feb 25, 2008 at 18:39

Monday, Feb 25, 2008 at 18:39
You could try the pajero club of Vic forum.

Vic pajero Club

Look at the gen III models for the 2001 NM.

It is a common problem with the Gen II, but usually associated with rear drive shafts, not engines. :o)
AnswerID: 289337

Follow Up By: tuffygordon - Tuesday, Feb 26, 2008 at 10:49

Tuesday, Feb 26, 2008 at 10:49
Thanks for the link Oldplodder.
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Reply By: howesy - Monday, Feb 25, 2008 at 18:49

Monday, Feb 25, 2008 at 18:49
look for soft or broken gearbox mount. Has been known to cause and timing of vibration after your work may be just coincidence
AnswerID: 289339

Follow Up By: tuffygordon - Tuesday, Feb 26, 2008 at 10:50

Tuesday, Feb 26, 2008 at 10:50
I like it Howesy,But cant find a damaged mount.Damn.
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Reply By: Dunaruna - Tuesday, Feb 26, 2008 at 17:33

Tuesday, Feb 26, 2008 at 17:33
The only reason I didn't go down the road of worn/broken mounts is that the problem is intermittent, that's usually electrics or fuel.
AnswerID: 289502

Reply By: Member - MUZBRY (VIC) - Thursday, Feb 28, 2008 at 12:47

Thursday, Feb 28, 2008 at 12:47
Gday
The first thing that i would do is go back over what has been done by yourself. ie.. spark plugs..they don;t always work even when new. that is the cheapest thing to do.Then check the plug leads , mainly because they were taken off and possibly bent causing a spark to jump.
Just my opinion,...
good luck
Murray
Muzbry
Great place to be Mt Blue Rag 27/12/2012

Lifetime Member
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AnswerID: 289801

Follow Up By: tuffygordon - Thursday, Feb 28, 2008 at 13:16

Thursday, Feb 28, 2008 at 13:16
yep,im keen to start there.new leads and check all plugs.i will post the results here.Keep sending in those suggestions however,as im a bit sceptical.
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Reply By: tuffygordon - Thursday, Feb 28, 2008 at 16:13

Thursday, Feb 28, 2008 at 16:13
Hey,just got a tip that the "damper clutch" in the torque convertor has caused this type of vibration in several other pajeros of this model (also some magnas).Tip came from senior mechanic at mitsubishi Newcastle,and also got same answer fro Barry Stace Automatics in Newcastle.Could be due to incorrect oil being used in gearbox or faulty parts.Customer is now being sent to Auto trans expert to get a Auto oil flush,We the cross fingers and hope it works.Gearbox must use Type M Special,not Type M or any other common oil.Sigh.
AnswerID: 289831

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