Idle air control valve

[Whitaker717]

Hey guys got an issue. In the mornings the truck was sputtering, so I decided to start by changing out the idle air control valve. Now the engine is receding up so high it sounds like it will explode. I took it for a drive to see if it would reset and nothing. It’s even shifting funny now. What in the world is going in here

[Whitaker717]

I put my old one back in and it idles at normal speed. 

[cruiser54]

Go to www.cruiser54.com and complete Tips 1 through 5 first. 

[omega_rugal]

and people keep messing with the IAC...

[Whitaker717]

Just trying to learn. I don’t have a lot of fancy tools for testing connections. The way it sputters tells me from my little knowledge it’s around the throttle body, so the iac or the tps. Runs great when it warms up. 

[ghetdjc320]

What RPM is it hitting when it ramps up when you start it cold? 

[cruiser54]

what fancy tools do you need to check connections? 

 

Did you check out my Tips and read the introduction to each one? That might help with your understanding their importance. 

[Whitaker717]

Isn't step 5 checking sensor grounds? I will do most of these this week. 

[cruiser54]

Yes. You don't have a meter? Less than $10 in many places. Do 1 through 4 in the meantime. we'll guide you through the meter part. Super easy. 

[Whitaker717]

Sweet. I will pick one up this week. Thanks as usual!

[cruiser54]

what year is your MJ?

 

[Whitaker717]

87 with the 4.0 4wd

[cruiser54]

OK. 1 through 5 then. 

[Eagle]

12 hours ago, Whitaker717 said:

Sweet. I will pick one up this week. Thanks as usual!

 

https://www.harborfreight.com/7-function-digital-multimeter-63759.html

 

Often on sale for $3.99

 

These are handy, too: https://www.harborfreight.com/18-inch-low-voltage-multi-colored-test-leads-66717.html