Hey Guys,

I have a TJ SII Exec and I am expiriencing some ruff idling, I just wanted to know what revs you guys sat on when idling, mine is sitting on 4/500 RPMs when idling...

Hey Guys,

I have a TJ SII Exec and I am expiriencing some ruff idling, I just wanted to know what revs you guys sat on when idling, mine is sitting on 4/500 RPMs when idling...

Like a bit shaky when at idle? Yeh, I got exact same model, been having the same problem for the last couple of weeks. I went away to NZ for a couple of weeks, came back and it's been a problem since then...

Hey Guys,

I have a TJ SII Exec and I am expiriencing some ruff idling, I just wanted to know what revs you guys sat on when idling, mine is sitting on 4/500 RPMs when idling...
Thats very low, near stalling. It should be 700+-50 rpm. Either adjust it yourself (there's a
screw for adjusting it near the throttle body) or get it serviced as there could be another
reason for it been low.

Hey Guys,

I have a TJ SII Exec and I am expiriencing some ruff idling, I just wanted to know what revs you guys sat on when idling, mine is sitting on 4/500 RPMs when idling...

It's a common problem with 3.5L autos as far as i can tell. The Idle speed is just low enough to cause vibrations to feedback thru the steering wheel, floor panel, and if no-one is sitting in the passeger seat, you may be able to see it {{SHAKE}} <-- shake lines.

I've had my TJII at two seperate mitsu dealers and neither of them did anything but up the base idle (not sure if they do it mechanically or thru the ecu - i'm thinkin ecu but cause both times, after a couple of days it was back to rough). I wasn't real happy with that anyway cause it made my fuel consumption go up noticably.

I've heard some people on here say they have had their engine mounts replaced with softer ones on warranty. The dealer I went to for 45000 service denied any knowledge of this practice.

nonetheless - I'm taking annual leave in january, and I plan to pitch a tent in the mitsubishi service waiting room if thats what it takes to have the following "known issues" fixed under warranty:
rough idle under load
Rear window seal deteriorating
hand brake shoe rubbing
and rattley engine pipes

Edit: I'll take notice when I drive home this afternoon and post at what rpm mine idles at.

hmm, the idle speed is normally adjusted via a screw on the throttle body, it could be the screw is loose, so it unadjusted itself, or there could be something more major.

Dumb question, where is my throttle body located?

I know how things work under the hood in theory but when i look at things i don't -always- know what they are...

Dumb question, where is my throttle body located?

I know how things work under the hood in theory but when i look at things i don't -always- know what they are...
Its towards the firewall on the passenger side. Just follow the air intake pipe from the filter
asselbly (a black box behind the passenger side headlights).

This problem was discussed at length in another thread and the results & remedies I have been able to derive are as such (for TH models onwards only):

The base idle can be adjusted through the screw on the throttle bottle, BUT, this WILL NOT set it in place. The idle will go to the desired level but the ECU will gradually adjust the rpm back to where it was before which means you have to adjust the screw every few days. As I recall, the screw was wound out to adjust revs up. When screw is wound all the way out, it will be necessary to screw it right back in to start the whole process over again, needless to say, screwing it right back in, will drop your revs which is exactly what you dont want to happen, but, you just have to wait until the computer re-adjusts back to its preferred base idle.

The way to fix this is that you will NEED to take it to mitsubishi and have them connect a MUT-II diagnostic tool to the cars ECU in order to "set" the idle where you want. The idle is adjusted through the screw on the thottle body, but you need the computer connected to the MUT-II unit in order for the ECU to accept the changes.

Be aware, this is not fixing the problem. It is just a solution to get around the problem. I have no idea what is causing the problem but I do know it can be a number of things such as the EGR system, various vacuum solenoids and so forth. I was going to go through them all and try and find out what may have been the problem, but because nobody could ever tell me what back probing meant, I have'nt been stuffed with it.

Anyway, hope this helps. By the way, explain this to mitsubishi and they will probably refer you to a psychologist as according to them, this problem never happened :redface: . Even if they are sitting in the car and its shaking its a$$ off, they will try and tell you the car is fine and theres nothing wrong. This has to be one of the biggest faults with the magnas and they refuse to recognise it. Makes me wonder why :think: