Engine idles too high?

BRANDON .SPURLOCK

MEMBER
9 POSTS

I cleaned the iac when it was out of the truck. I have driven already 120 miles so it should be set already? Have you ever heard of this before where it is only after the truck is shut off than turned back on that the problem is there?

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Thursday, June 18th, 2020 AT 1:17 PM (Merged)

HMAC300

MECHANIC
48,601 POSTS

No but stranger things h ave happened, I dorn' tknow what to suggest. Unless throttle is sticking due to age/mileage.

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Thursday, June 18th, 2020 AT 1:17 PM (Merged)

BRANDON .SPURLOCK

MEMBER
9 POSTS

I'm back. So today driving home the check engine light came on. Checked the codes. Got 22 (Tps- low signal voltage), 24 (vss- this I know about, the spedo has been out for some time, I have changed the vss and inst. Cluster, still not working, maybe a broken wire somewhere?) & 34 (Map sensor voltage low). Are all these parts somehow related? I really don't want to change the map and tps and find out the sensors really weren't bad. What do you think I should check?

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Thursday, June 18th, 2020 AT 1:17 PM (Merged)

HMAC300

MECHANIC
48,601 POSTS

Remember I said to check the hose leaing to the pmap sensor to make sure it has no holes or soft? That's on the firewall that is what I suspected but wasn't sure but it hink you saidhoses were ok, well pull it off map and see if you ae getting vacuum through it. If you are replace it. Check wiring at tps and see ifyou are getting voltage through any of the wires. And the vss may be why your speedo isn't working or the wiring is bad. It all relates to each other when vehicle is running and warm.

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Thursday, June 18th, 2020 AT 1:17 PM (Merged)

BRANDON .SPURLOCK

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9 POSTS

Ok. So to make sure I am doing this correct. I am going to pull the vacumm line off the map sensor and check for vaccum. If I have vaccum replace the map sensor? Also check the tps wires for voltage with a multi meter. If I do have voltage what would be next? R/R the tps? I have replaced the vss and the inst. Cluster. Broken wire possibly? With the miles on the truck and the electrical problems I am having do you think it is possible the ECM is going out? Thanks for the help on this stuff I will definitely be donating some more money to the website.