Ideas on S-10 troubles - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Maximum Overdrive · 06-16-2003, 07:22 PM

The basics: 86 4wd S-10 with a 2.8 V-6 with a TBI.
Problem: On a hot day after starting truck it seems to open the EGR all the way which in turn causes truck to idle rough or not at all. Sometimes it stays like this even after motor has been ran for a while and other times it quits after 15 min. of driving. On the cooler days there is no problem at anytime. Tested EGR valve and solonoid according to the limited information in the Haynes and Chilton manuals and it comes up good. Have recently replaced the MAP, Air valve and TPS to fix some other problems it had.

Any ideas on what to look for? Thanks for any help.

70c10 · 06-16-2003, 10:33 PM

I'm stumped. ttt

apstguy · 06-17-2003, 12:36 AM

Isn't the EGR valve contolled by vacuum? Just replace the sensor it is hooked up to -- if not & computer controlled, replace the Idle Air Control (IAC) valve and see if it helps. Engine coolant sensor maybe???

Maximum Overdrive · 06-17-2003, 10:17 AM

Quote:

Originally posted by apstguy
Isn't the EGR valve contolled by vacuum? Just replace the sensor it is hooked up to -- if not & computer controlled, replace the Idle Air Control (IAC) valve and see if it helps. Engine coolant sensor maybe???

EGR solonoid tested good. (I'm cheap and will not pay the $85.00 for the new EGR solonoid just to replace even though it tests good) Idle Air Valve, TPS and MAP sensor was replaced less than 2 months ago. Will look at coolant sensor again though.

06-16-2003, 07:22 PM	#1
Maximum Overdrive December 21, 2012 Join Date: Apr 2000 Location: Black Eagle, Montana Posts: 1,634	Ideas on S-10 troubles The basics: 86 4wd S-10 with a 2.8 V-6 with a TBI. Problem: On a hot day after starting truck it seems to open the EGR all the way which in turn causes truck to idle rough or not at all. Sometimes it stays like this even after motor has been ran for a while and other times it quits after 15 min. of driving. On the cooler days there is no problem at anytime. Tested EGR valve and solonoid according to the limited information in the Haynes and Chilton manuals and it comes up good. Have recently replaced the MAP, Air valve and TPS to fix some other problems it had. Any ideas on what to look for? Thanks for any help.

06-16-2003, 10:33 PM	#2
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,857	I'm stumped. ttt __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

06-17-2003, 12:36 AM	#3
apstguy LED King Join Date: Jan 2003 Location: Sacramento, CA Posts: 2,088	Isn't the EGR valve contolled by vacuum? Just replace the sensor it is hooked up to -- if not & computer controlled, replace the Idle Air Control (IAC) valve and see if it helps. Engine coolant sensor maybe??? __________________ Tyler 1985 C10 305 w/ Bowtie OD TH700R4 3.42 LSD 202,000 miles 2006 Ford Focus ZX3 5-speed Stick 2016 Chevy Spark EV Gone: 2002.5 VW GTI 24v VR6 Gone: 2008 VW R32



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.