Whitaker717 Posted September 25, 2021 Share Posted September 25, 2021 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 Link to comment Share on other sites More sharing options...
Whitaker717 Posted September 25, 2021 Author Share Posted September 25, 2021 I put my old one back in and it idles at normal speed. Link to comment Share on other sites More sharing options...
cruiser54 Posted September 26, 2021 Share Posted September 26, 2021 Go to www.cruiser54.com and complete Tips 1 through 5 first. Link to comment Share on other sites More sharing options...
omega_rugal Posted September 26, 2021 Share Posted September 26, 2021 and people keep messing with the IAC... Link to comment Share on other sites More sharing options...
Whitaker717 Posted September 26, 2021 Author Share Posted September 26, 2021 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. Link to comment Share on other sites More sharing options...
ghetdjc320 Posted September 27, 2021 Share Posted September 27, 2021 What RPM is it hitting when it ramps up when you start it cold? Link to comment Share on other sites More sharing options...
cruiser54 Posted September 27, 2021 Share Posted September 27, 2021 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. Link to comment Share on other sites More sharing options...
Whitaker717 Posted September 27, 2021 Author Share Posted September 27, 2021 Isn't step 5 checking sensor grounds? I will do most of these this week. Link to comment Share on other sites More sharing options...
cruiser54 Posted September 27, 2021 Share Posted September 27, 2021 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. Link to comment Share on other sites More sharing options...
Whitaker717 Posted September 27, 2021 Author Share Posted September 27, 2021 Sweet. I will pick one up this week. Thanks as usual! Link to comment Share on other sites More sharing options...
cruiser54 Posted September 27, 2021 Share Posted September 27, 2021 what year is your MJ? Link to comment Share on other sites More sharing options...
Whitaker717 Posted September 27, 2021 Author Share Posted September 27, 2021 87 with the 4.0 4wd Link to comment Share on other sites More sharing options...
cruiser54 Posted September 27, 2021 Share Posted September 27, 2021 OK. 1 through 5 then. Link to comment Share on other sites More sharing options...
Eagle Posted September 27, 2021 Share Posted September 27, 2021 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 Link to comment Share on other sites More sharing options...
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