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Mitsubishi Forums >> Mitsubishi 4x4 & SUV Tech

SledgeHammer
Mudrunner

Reged: 02/22/11
Posts: 253
Loc: Alabama

91 MM stumble
06/30/12 12:38 PM

here is what i have:
91 mighty max w 2.4l and 5 speed.just bought it from owner of 13 years.
truck idles ok,has what i would say is the typical mistubishi studder at idle.I have owned eclipses and starion/conquest and never had one to idle perfectly except when I upgraded the MAS from a newer car.
anyway,driving down the road,it will stumble,kinda like a quick booble like it wants to misfire.this may go on for a mile or 10 then it will just pick up a little more power and run fine.May run fine for a mile or 20 then go back to the stumble.
On my old starquest cars,i would be looking at the vac advance first.
on this one,cause we had another do the same thing,we changed the fule filter.This did not clear it up at all.
truck has 190k.was told new water pump/timing chain etc 60k miles ago.new clutch 30k miles ago.Wires look new and the plugs look great,NGK.
Just wondering if anyone else has had this happen.I am leaning to maybe cat trying to clog up,mas air or possibly fuel pump losing pressure or FPR
Checked the plugs to see fi they are loose and also all grounds.i am ok there

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Subject	Posted by	Posted on
91 MM stumble	SledgeHammer	06/30/12 12:38 PM
Re: 91 MM stumble	fasteddy	06/30/12 05:46 PM
Re: 91 MM stumble	SledgeHammer	06/30/12 07:36 PM
Re: 91 MM stumble	MI_Mitsu	07/02/12 12:40 PM

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