Idle problem

[texasman31]

I have a 93 chevy when i first start it no problems,but i drive it for about 20mins or so i'll come to a stop and it wont idle almost to a point to where it dies but doesnt but the idle is horriable on it and when it gets to this point i'll go to take off and it's like its starving to get the gas to the injectors and i have heck from that point on

[brad4eva]

Would it be slightly out of time? The throttle possision sensor / map sensor , they might be going bad , have them fixed asap it could cost you your 4l60e if you have one they aint fun >.<

[Sneakysportsman]

Fuel delivery problem, Pump or more over the filter is clogged. Because when it first starts it is in cloosed loop mode which in turn is basically a choke mode for 70 seconds, which adds more fuel thru the injectors, which in turn makes it run right at first startup. Even could be a weak injector.

[gmctrucks]

Do a goggle seach on Seafoam on how to apply the stuff is SUPER you can buy it at any parts store this stuff will clean your EGR and more maybe that's what wrong with it.

[87c10slammer]

hey gmc not to be an *** or anything but are you getting paid to promote that stuff. is it really that good or what. every problem that is engine related you seem to say seafoam is the miracle cure. it makes me want to put my c10 back together and run the stuff through it just to watch it die again. it cant be that good. whats the deal

[Sneakysportsman]

Sea Foam is a very stringent cleaning agent for an engine. A lot of small engine manufactureres recommend it to cut carbon build up and sludge. I mixed up a mixture of 75% SF and 25% water and poured it in a Hot Kohler Engine and it busted out over 70% of the carbon build up inside the combustion chamber and resealed the valves. I know this for a fact because I still had to pull the heads and remove the carbon chips that were just beating around in the combustion chamber that wouldn't pass thru the Exhaust. It does a good job on water removal and tarnish build up.

[Shodrite1]

I have the same problem going on with a 92 blazer with a 5.7 It cranks up fine then once warm it has a terrible idle but doesnt knock off and seems to run fine going down the road and power seems to be fine I have replaced plugs wires cap and button and gave the injectors a good cleaning but nothing changed. I am now suspecting a bad sensor somewhere. Any body have any suggestions?

Originally Posted by texasman31

I have a 93 chevy when i first start it no problems,but i drive it for about 20mins or so i'll come to a stop and it wont idle almost to a point to where it dies but doesnt but the idle is horriable on it and when it gets to this point i'll go to take off and it's like its starving to get the gas to the injectors and i have heck from that point on

[Sneakysportsman]

There are onle a few sensors the regulate run and power, Throttle position sensor, O2 sens, and MAP, 92 also has a barrometric Pressure sensor. Also for both guys you have a evap canister in the front engine bay, All it does is use the vapors from the fuel tank but if the line has a leak from the canister to the solinoid at the water neck it will cause a lean condition.

[leolkfrm]

sounds like a vac leak, egr, split hose, hose you forgot to reconnect after working on it. listen for a whistle or sucking air

[Shodrite1]

I bought a code reader last night on the way home...it coded a 32 wich could be a barrometric pressure sensor..or a egr valve or egr solenoid .... I bought an aftermarket egr valve...it was made a little diffrent from the one I took out..it came with several diffrent sized orfices and I was supposed to get the size from the part number from the old egr but it to was an aftermarket with no numbers on it...so I tried the 42 it ran alot worse..tried 32 ran the same as before..tried 28 still no diffrence...so I put the old one back in..anybody know what size orfice it is supposed to have.???

Originally Posted by Sneakysportsman

There are onle a few sensors the regulate run and power, Throttle position sensor, O2 sens, and MAP, 92 also has a barrometric Pressure sensor. Also for both guys you have a evap canister in the front engine bay, All it does is use the vapors from the fuel tank but if the line has a leak from the canister to the solinoid at the water neck it will cause a lean condition.