Engine shake on idle

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Engine shake on idle

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Mitsubishi Forums >> Mitsubishi Models >> Mitsubishi Montero & Montero Sport >> Engine shake on idle

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Engine shake on idle - 2/25/2007 5:17:01 AM

wrexed03

Posts: 6
Joined: 2/25/2007
Status: offline

Hi all im new here hope someone can assist. I have a 2001 NM Pajero 3.5 Petrol Engine. Since buying this vehicle a few months back the engine has a shake on idle. Recently i have converted the vehicle to LPG so it runs both fuels via a switch. I still get this shake using LPG fuel.I have played with the idle screw upping the revs but ECU relearns its idle so it goes back to normal after a couple of daysI have been trying to resolve this problem for a while now but no luck as yet.Plugs and leads were replaced just over a month ago with genuine mitsu items.This is what i did today. I lifted the rear of the trany still get the vibration/shake. Lifted the front of the engine still get the vibes.Checked balancer no wobble observed.Other parts i have swaped which i had access too as follows.Complete set of Ignition coils.EFI Temp Sensor.Throttle Position Sensor.Ingiter the item that sits next to the coils.O2 sensor was done the other day.Basically all the sensors except the Airflow Meter cause we couldnt find it where it was stored.Removed throttle body and gave it a good clean with throttle body cleaner even though it was already cleaned.Cleaned PVC valve.ISC checked and working.Re checked all hoses for leaks.Checked manifolds for leaks as well.Still get the vibes on idle.Next step is to remove the timming cover and check the cam timming.I have a feeling the person who replaced it may have botched the install.Cant believe i spent the whole day on it and no closer to sorting the problem out. Any further tips or advice most welcome

Post #: 1

RE: Engine shake on idle - 3/13/2007 4:50:59 AM

wrexed03

Posts: 6
Joined: 2/25/2007
Status: offline

Ok now for the conclusion. I have some good news. Its fixed. :)
Took it to my mechanic today we pulled the timming covers off and all the other bits and pieces in front of the engine.Our findings are as follows.Passenger side camshaft was out by one tooth.Tensioner on timming belt loose as a goose the belt had a fair bit of play side to side.Basically since we had it pulled down suggested we replace the timming belt anyway.Timming belt had been replaced by previous owner obviously it wasnt done correctly.I consider myself very lucky the belt didnt jump any further otherwise i would have suffered the good old bent valve syndrome and other damage associated with this.Anyway we put the thing back together and it just purrs like a kitten now. So quiet so smooth even with all the accesories on placing a load on the engine. Such a sigh of relief finally. I have been chasing this problem for a while now and can happily say its sorted. Best part was the cost. All up $300.00 which included the belt and labour associated with this piece of work.Thanks all for your suggestions.Best Regardswrexed03

< Message edited by wrexed03 -- 3/14/2007 2:05:58 AM >

(in reply to wrexed03)

Post #: 2

RE: Engine shake on idle - 3/13/2007 11:36:56 AM

Winshawn

Posts: 269
Joined: 1/31/2005
Status: offline

Interesting. I have an '03 3.8L and it has shaked a bit since new. Now at 40k it shakes a bit more than it used to.

In another thread, TJ stated that his belt was loose at 60k when he changed his.

I wonder if mine is getting loose?

_____________________________

'90 Montero (sold-sadly)
'95 Montero LS (166k) - my car
'03 Montero Limited (36k) - wife's car

(in reply to wrexed03)

Post #: 3