Idle speed

[chevyCowboy]

is there any way to adjust the Idle on these motors mine used to idle at around 800rpm and now its up at 1000 rpm
Thanks

 

[buddy]

Have you upped the fuel output on the IP? Or is it cold out now so that its doing high idle?

 

[chevyCowboy]

i was noticing today that when i first started it up it was idleing at around 800 but after driving for awhile while at a stop light it was idleing at 1000 and when it idles that high i get a lot of vibration but at 800 it has much less vibration

 

[buddy]

I dont know a whole lot about the mechanical pumps, but I'd suspect the coolant temp sensor that feeds your cold advance. When youre experiencing the 1000RPMs idle and its fully warmed up, unplug the CTS and make sure it measures about 300ohm from one lead to the other on the sensor itself (you can do it with the truck off). If its measuring a lot higher, like 1500 - 100,000ohm and higher you should replace it. Or another test might be to get it idling and warm at 800rpm, then unplug the CTS and see if jumps to high idle at 1000RPM. Just to see if that can even effect the idle in that manner.

 

[midniteplowboyy]

is there any way to adjust the Idle on these motors mine used to idle at around 800rpm and now its up at 1000 rpm
Thanks

Yes, you can adjust idle. Its kinda like the carb on a gasser, look where the cables attach to the IP, the idle screw is angled up pointing forward(IIRC, 10mm head or flat head screw driver). Also the fast idle solenoid has an adjustment, it may need backed out some also. Check throttle/cruise cables, make sure they have some slack.

How many miles on that IP? It may be worn out like my 92, it dont idle as low as it should even with the screws backed out, but it has 350k on it(I'll change it when it starts giving me other problems) still starts the best of all my trucks.

Have you ran any fuel conditioner in it yet?

 

[chevyCowboy]

its got close to 252k on the truck and as far as i know its the original IP the guy i bought it from was the original owner and when i asked what all hed relpalced he just said Injectors LP and Gp's
ok that is what i thought would be the idle adjust

Also the high idle solonid was burned out so the prviouse owner just ran a 12 volt source from the fuse box throught a switch and to one of the wireing conectors on the IP and that is how the Cold idle advance is operated i should order a new one and just fix it the right way

 

[chevyCowboy]

ive tried to adjust the idle on my truck and either way i turn the screw it dosent do any thing
how is the cold idle advance operated i know there is a solinoied and as i said its wired to a switch when i start the truck cold it idles around 800 and after it warms up its around 1000 and it shakes alot at that speed any one got any ideas

 

[buddy]

It seems a little odd that you could reduce fuel and idle stay up. Is your throttle cable loose? Are you adjusting the throttle cable?

 

[ghitch75]

pull the plug on the high idle solenoid and see if it idles down...if not it's stuck...mine stuck on my 1 ton.....cleaned it out with card cleaner...has never stuck after that...

 

[chevyCowboy]

i thing the spring that pulls the throttle back might be wone beacouse i can pull it back and it drops to 800
could that be the problem

 

[buddy]

Worn spring sounds like the culprit, had that before on a gasser Carb.

 

[chevyCowboy]

i couldnt find a part on rock auto u think a dealer would have or should i just go to the hard ware store and get the closest on i can fine. westlake has a pretty good selection of springs

 

[buddy]

If the spring is only to return it to a fixed home position then any spring will work.

 

[Non Typical]

I should go and look at mine, but from memory, it's a fixed position spring. Just try to match as close as possible to stock spring.

Do not go to the stealership. They will do nasty things to your wallet.

 

[chevyCowboy]

i didnt want to but wasnt sure if spring size made a differnce