I can't get my idle speed or timing set on my 89 V6 montero. I cleaned the throttle body and replaced the ICS and replaced the TPS. I double checked the TPS adjustment, fixed SAS, and accelerator cable.

The curb idle speed is now around 2k.

When I hooked up the timing light and the jumper cable on the timing adjustment terminal. When I turned the truck on the idle was 1k with the timing about 10 BTDC.

If I start the truck and it was idling at 1k I pulled the jumper cable off the timing adjustment terminal the curb idle speed will jump to 2k and stay there.

I checked the Air Temp sensor cause I was getting they code but it operated within specks. I checked the ECT just for kicks and it was good.

I am out of ideas. <img src="/forums/images/graemlins/confused.gif" alt="" />

About 6 months ago I had a crank /no spark/ no start issue and sent the ECU out for testing but is was fine. The issue then was a bad optical sensor.

HELP!

Sorry I did not get back to you on the wires ...That plug is on a mess of Mitsu's and Korean mitsu powered cars ..

My 89 was doing the same thing as yours 2k idle ... It was a bad MASS that was doing it "on my truck"...And if anyone cares I'm running a 91 MASS on a 89 monty

I unplugged the MASS ...pulled the three screws on the idle control valve coils .. Pulled out the ICV coils and adjusted the idle my turning the armature out on the ICV ...Left the coils out and MASS unplugged and drove the truck for a few months until I could find a good MASS...In doing so the ECM had no control over the ICV...Idled a little lumpy do to the unplugged MASS...

David

Hazardous Toys inc

Did you test the MASS with the hairdryer described in the service manual?

I am wondering if the MASS can pass that test and still be bad.

Today I am going to install a salvaged TB and see if it works.

I my travels the only way to really test a MASS is with a MASS you know is good ...And I do this [censored] for a living ..

I dont "think" the pill in the TB would let the idle ever get that high ... Mechanically impossible I "think" ...If anyone have a died 89 TB I would like to bypass the pill and idle it off a hole in the TB plate ....Let me know

Darrel ..Does the truck ever idle right ...?

The thing I want to know is if a car V6 MASS will work in a truck ... Have had good luck with 4cyl MASS and swaping ..Never tryed V6 stuff

I see what you where saying. I am just going to leave it like that until I find some other mass. Do you know if a mass from other v6's 3.0l would fit ?

Sorry I kinda change the subject, but I am having a similar issue just that the idle was to low to the point the truck would stall.

So I got a salvage throttle body and sure enough that did the trick. I now can control the idle. I still think it is mysterious that nothing I tried could identify a vacuum leak. Oh well.

Has anyone followed the procedure to set the accelerator cable tension. I have a chiltons type manual (I couldn't find it in the FSM I downloaded here) that has you get the engine normal operating temp, turn the key on for 15 sec and then place a feeler gauge ( I can't remember the thickness) between the SAS and the throttle and then tighten the throttle cable tension to that. I followed this and either I am doing something wrong or its whacked! If you do this the throttle never touches the SAS and the idle speed is elevated and not controlled by anything.

I am still having issues with the timing. Now that I can control the idle speed I set the timing. With the timing set the engine pings severely. So I had to set the timing by driving it and adjusting the timing until I did not get any pinging. Something is still not right. The engine is sluggish and does not have the power I know it used to.

I'm stuck.