6.2 runs away on warm ups using high idle...

[brazengoat06]

1985 M1010 after cold starts when using high idle at times will randomly rev itself up to an estimated 2600 rpm and hold there until high idle solenoid turns off. The other part of the time the high idle solenoid intermittently functions which I believe it just needs a new solenoid. My question is why is it running away and revving up as such? Thanks

 

[brazengoat06]

Bump

 

[m1garand_man]

I don't know why it does this but mine does the same thing. It was so alarming I disabled the solenoid altogether.

 

[cucvrus]

Spray some lube on it and adjust the fast idle so it don't rev the engine up so high. Did you change the injection pump? Sometimes that lever is pitched different on the injection pump. An adjust and lube job is in order. Careful don't break the shaft on the fast idle solenoid.

 

[brazengoat06]

Where exactly am I spraying lube? I'm assuming the shaft rumming through the fast idle solenoid?

No I have not replaced the IP.

Thanks!

 

[CUCVLOVER]

I would say you just spray some wd40 on the selonoid shaft.
Just remember less is more. You don't want to just submerge everything in it.

Hope this helps.

 

[m1garand_man]

My original solenoid was frozen and never worked. When I swapped my engine the replacement had a working one on it. I think it needs to be adjusted. The current one wont turn when I put a screwdriver to it and I wasn't wanting to force anything. Am I correct in assuming that it screws in and out?

 

[jpg]

My original solenoid was frozen and never worked. When I swapped my engine the replacement had a working one on it. I think it needs to be adjusted. The current one wont turn when I put a screwdriver to it and I wasn't wanting to force anything. Am I correct in assuming that it screws in and out?

Look in the TM 9-2320-289-20, section 3-25, ENGINE IDLE SPEED ADJUSTMENT.

5. Use an insulated jumper wire from
front battery positive (+) terminal to
adenoid terminal (3) to energize fast
idle solenoid (4).

7. Adjust extended fast idle solenoid
plunger (2) by turning hex head of
fast idle solenoid plunger to an to an enginefast idle speed of 800 rpm.

The TMs are your friend. If the screw won't turn, PB Blaster or similar products can help free it. Give it time to soak in, and repeated treatments over a period of days may be necessary.

 

[brazengoat06]

Thanks!

TM's are our friend, but personal experience of others is my best friend

 

[m1garand_man]

Thanks!

TM's are our friend, but personal experience of others is my best friend

Just note that TM's like Chiltons only tell you what to do and rarely give suggestions on how to do it when things aren't going right. For example when it came to bleeding my fuel injection pump the only warning was to not run the starter more than 10 seconds at a time. What it didn't tell me was that it may take more than a few cycles of priming using the starter to get a recently rebuilt pump to fully bleed. The first time I ever bled one I spend hours fretting over breaking something. Now I know better.

 

[brazengoat06]

Replaced faulty solenoid and lowered high idle adjust. Seems to have corrected issue. Thanks folks