KJ won't stay running at idle, 3.7 V6

KJScott · **Posted:** Thu Jun 05, 2008 9:16 am

It will stay running if hold the throttle only. Engine runs smooth when I do this, but let of the throttle and it dies. I am thinking vacuum leak or dirty idle air control valve making it stick. Any ideas? No check engine light. Any advice for cleaning the IACV? Thank you!!! :cry:

Hood297 · **Posted:** Thu Jun 05, 2008 10:59 am

have you done any battery work recently? If you leave your battery disconnected for a while the PCM will lose its memory and will not hold the throttle at idle.

If you have switched batteries, or left the terminal off for a while you will need to keep the engine running manually for a about 2-8 minutes.

If that doesnt work, check the ground for the PCM.

KJScott · **Posted:** Thu Jun 05, 2008 11:04 am

No, no battery disconnect, although my ground lug on the battery is covered in corrosion. Will be cleaning that also.

Hood297 · **Posted:** Thu Jun 05, 2008 11:22 am

yea that could be a very real possibility. or there is a flat ground wire that connects to the body. either one could be a fault.

pssbarry · **Posted:** Thu Jun 05, 2008 12:58 pm

How old is your battery? I had the same problem when my battery was going bad. It would start but I had to keep the RPM's up or it would die. Replaced and the problem was fixed.

VTNomad · **Posted:** Thu Jun 05, 2008 1:51 pm

How many miles you got?

Have you checked the sprak plugs?

KJScott · **Posted:** Mon Jun 09, 2008 4:03 pm

Thanks you guys. I cleaned up the corrosion on the ground side of the battery. That fixed the idle problem. I topped of the battery and shut the hood. I go out the next morning and battery was dead. Rode the Harley to work and that night, load tested the battery after charging it. DEAD. So a new battery and all is good. I got six years of service out of that factory battery. Pretty darn good!!!

sleeve84028 · **Posted:** Mon Jun 09, 2008 7:38 pm

Stock batteries are dropping like flies right now. This is the second battery from 2002 that has failed in a week. More to come?

tjkj2002 · **Posted:** Mon Jun 09, 2008 7:43 pm

sleeve84028 wrote:

Stock batteries are dropping like flies right now. This is the second battery from 2002 that has failed in a week. More to come?

Considering most auto batteries are only ment to be good for 3 years,4 at the most,your pushing your luck after that,your going to see a bunch going from '02,'03,'04,and '05 KJ's.

tommudd · **Posted:** Mon Jun 09, 2008 7:49 pm

tjkj2002 wrote:

sleeve84028 wrote:

Stock batteries are dropping like flies right now. This is the second battery from 2002 that has failed in a week. More to come?

Considering most auto batteries are only ment to be good for 3 years,4 at the most,your pushing your luck after that,your going to see a bunch going from '02,'03,'04,and '05 KJ's.

Oh come on tjkj, mines an 04 with over 100,000 , now that you have said that mine will be going next :twisted:

just to prove you right! Darn , better go get another battery tomorrow! :wink:

KJScott · **Posted:** Mon Jun 09, 2008 9:56 pm

6 years from an original battery amazes me, never got that much life from previous Ford or GM products.

sleeve84028 · **Posted:** Tue Jun 10, 2008 7:47 am

I feel the only reason my battery finally died is because I stopped driving the KJ on a regular basis. The sudden change in charging and useage habbits I think led to its demise. Oh well... I'm all Optima'd up now.

KJ won't stay running at idle, 3.7 V6

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