idle adjustment screw
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Laughing Gas
Joined: Apr 2011
Posts: 1,002
Likes: 7
From: London, KY
idle adjustment screw
I'm still having TPS problems even after a new TPS. I can't get it to adjust to with in range. To get it to 4 volts at WOT, it has to be up around 1.8 at idle throttle. I read that the idle rpms need to be correct for the TPS to be able to be adjusted right. Mine appears to be idling at around 850 or so. I adjusted what I think to be the idle screw but it doesn't seem to change anything. It is the screw that's on the IP just under and to the right of the throttle lever isn't it?
Here's my truck idling with it in drive.
Here's my truck idling with it in drive.
Logistics Pro
Joined: Sep 2007
Posts: 3,739
Likes: 181
From: Western Mass
You may have to adjust the cold idle solenoid to get a lower idle speed. If the throttle is touching the cold idle solenoid when the key is off, it won't go any slower no matter how you adjust the idle screw. Use a small wrench to turn the plunger on the solenoid.
I noticed this on my truck this spring when I swapped injection pumps. The cold idle solenoid was set at 1400 when engaged, and it would idle around 800. After adjusting the solenoid down to 1000, I could decrease the idle speed.
I noticed this on my truck this spring when I swapped injection pumps. The cold idle solenoid was set at 1400 when engaged, and it would idle around 800. After adjusting the solenoid down to 1000, I could decrease the idle speed.
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Laughing Gas
Joined: Apr 2011
Posts: 1,002
Likes: 7
From: London, KY
You are right, it is touching the plunger when the truck is off. I'll adjust it what I get home. I home getting the idle right helps with my TPS adjustment cause its about to push me over the edge!
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Laughing Gas
Joined: Apr 2011
Posts: 1,002
Likes: 7
From: London, KY
Good to know cause that's what I just did. I attempted to adjust the plunger on the cold idle solenoid but it wouldn't turn in or out so I just removed the plunger. This let the throttle lever actually come forward to where it should be at idle. Now my truck is idling at around 700. When I checked the TPS after letting the throttle lever come down to where it should be I got a reading of .72 volts! I adjusted it to 1.00 volts at idle and left it. It still will only go up to 3.66 volts at WOT but hopefully that won't matter! My constant wire on my TPS only has 4.95 volts, is this a concern? The constant wire on the TPS on my other idi has 6 volts.
Postmaster
Joined: Jul 2011
Posts: 3,061
Likes: 2
read these two links. it is what i went through. trust me on having to have the idle at min 750 rpm.
Idle Speed? - Oilburners.net
TPS help needed quick - Oilburners.net
Idle Speed? - Oilburners.net
TPS help needed quick - Oilburners.net
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Laughing Gas
Joined: Apr 2011
Posts: 1,002
Likes: 7
From: London, KY
Thanks 94IDI, I actually read your two threads on oilburners last night. My problem was that my cold idle solenoid was stuck and wasn't letting my throttle lever go all the way down and it was keeping the idle at about 900 all the time. I had to remove the plunger from the solenoid so I guess I'll have to get another cold idle solenoid this winter but it's running good for now. I can't tell exactly what the RPM's are by looking at the tach but I would guess 650 to 750. Now that I adjusted the TPS with the throttle actually in the idle position, the transmission shifts the best that it has since I've had the truck!
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Postmaster
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