High idle problem

[KAltizer]

I’m trying to decipher if I have a injector problem or throttle problem. I have my Smarty jr set on tow and while plowing it started to have what I would describe as a rough idle. I set the tune to stock and kept on plowing and after I took my foot off the throttle it would idle at 1,000 rpm then after about 10 seconds it would drop to 750. So I put the tune up to Performance and I have had no issues at all. I am thinking it might be an injector but I was wondering if the APPS might be the problem. Any input would be greatly appreciated thanks

 

[KAltizer]

I’m trying to decipher if I have a injector problem or throttle problem. I have my Smarty jr set on tow and while plowing it started to have what I would describe as a rough idle. I set the tune to stock and kept on plowing and after I took my foot off the throttle it would idle at 1,000 rpm then after about 10 seconds it would drop to 750. So I put the tune up to Performance and I have had no issues at all. I am thinking it might be an injector but I was wondering if the APPS might be the problem. Any input would be greatly appreciated thanks

Update: so I put the economy tune in and ran that for a couple days and had no problem until last night I got home and it started the rough idle. It’s very intermittent. I changed my fuel filter and added injection cleaner/lubricant and ran down to half a tank. I’m not sure I ran it enough for it to make a difference. I am going on a long trip next week so maybe after a couple more tanks with the additive it will help

 

[Wayne M.]

Any check engine light/ DTC’s? Any smoke?

 

[sag2]

Possible sticking injector. Get a scanner and monitor the APPS. The cost of a scanner (the $100 HF scanner will show data and a bunch more) will be very reasonable compared to the potential damage to a piston or cylinder. Once diagnosed you can make the appropriate repair.

 

[KAltizer]

Any check engine light/ DTC’s? Any smoke?

No codes and no smoke

 

[KAltizer]

Possible sticking injector. Get a scanner and monitor the APPS. The cost of a scanner (the $100 HF scanner will show data and a bunch more) will be very reasonable compared to the potential damage to a piston or cylinder. Once diagnosed you can make the appropriate repair.

Okay I’ll have my buddy check it out I am pretty sure he can get his hands on the scanner. The truck does have 204,000 on it so it might have an injector going

 

[AH64ID]

What was the coolant temp?

At elevated coolant temps the rpms will increase to 1000 until they cool down.

 

[KAltizer]

What was the coolant temp?

At elevated coolant temps the rpms will increase to 1000 until they cool down.

Temp was normal about 185 to 190 on all occasions.