91 s10 4.3 liter

side door · 05-09-2007, 09:14 PM

Any suggestions appreciated...

This truck only has 57K on it I bought it a couple of weeks ago. When I start it the idle is VERY high. It runs a little rough when there is no load on it and there is an intermitent ping... I don't know if these problems are related. From what I have read almost all electrical/fuel adjustmets are automatically controlled by the processor soooo there doesn't seem to be a way to make adjustments. My only thought was that it might be the idel air control valve... Anyone have any insight on this??

project88 · 05-09-2007, 10:45 PM

i have a suggestion, but it could be completely wrong,
knock sensor, basically a knck sensor will allow the timing to advance as far as it can, but when it detonates, senses a ping and retards timing. My knock sensor was unplugged for a while, never threw a code and had less power and ran rough, got it hooked up and worked fine. High idle could be lots of things,

just my opinion tho, if someone disagrees, thats fine, i submit!

mrjohnwayne · 05-10-2007, 08:55 AM

Knock sensor sounds like a good idea. as for the idle solenoid i'm not sure. Do you have a check/service engine light? Have you tried to pull any codes even if no light. That is where I would start and see if it'll help narrow things down.

side door · 05-16-2007, 08:04 PM

I am not getting any service lights but am going to check out the knock sensor this weekend, great idea. Thanks for the suggestions!!

mudseeker · 05-16-2007, 08:38 PM

high idle could be a vacum leak, the throtle body gasket is usually the problem. spray some carb cleaner around the gasket and if it stutters then you found your problem.

jrandalls · 05-17-2007, 06:16 AM

does this truck still have a catalytic converter on it or could it be stopped up? I had a 93 with the 2.8, I removed the cat and had basially the same problems you are describing.

dstrick32 · 05-17-2007, 07:01 PM

Also spray good around the rear of the intake on both sides. This was a common leaking point on the 4.3.

05-09-2007, 09:14 PM	#1
side door Junior Member Join Date: May 2007 Posts: 2	91 s10 4.3 liter Any suggestions appreciated... This truck only has 57K on it I bought it a couple of weeks ago. When I start it the idle is VERY high. It runs a little rough when there is no load on it and there is an intermitent ping... I don't know if these problems are related. From what I have read almost all electrical/fuel adjustmets are automatically controlled by the processor soooo there doesn't seem to be a way to make adjustments. My only thought was that it might be the idel air control valve... Anyone have any insight on this??

05-10-2007, 08:55 AM	#3
mrjohnwayne Moderator Join Date: Apr 2005 Location: Texas Posts: 3,221	Knock sensor sounds like a good idea. as for the idle solenoid i'm not sure. Do you have a check/service engine light? Have you tried to pull any codes even if no light. That is where I would start and see if it'll help narrow things down. __________________ John Wayne 2000 F-350 7.3L Powerstroke 4x4

05-16-2007, 08:04 PM	#4
side door Junior Member Join Date: May 2007 Posts: 2	Thanks for the suggestions I am not getting any service lights but am going to check out the knock sensor this weekend, great idea. Thanks for the suggestions!!

05-16-2007, 08:38 PM	#5
mudseeker mod-o-tator Join Date: Feb 2006 Location: michigan Posts: 4,525	high idle could be a vacum leak, the throtle body gasket is usually the problem. spray some carb cleaner around the gasket and if it stutters then you found your problem. __________________ member map add yourself alldatadiy why is it, when i push one for english, i still can't understand the person on the other end?

05-17-2007, 07:01 PM	#7
dstrick32 Senior Member Join Date: Dec 2006 Location: Hilliard, FL Posts: 101	Also spray good around the rear of the intake on both sides. This was a common leaking point on the 4.3. __________________ 95 Ford F-150XL 5.0 Automatic 92 Chevy Silverado 5.7 Automatic 94 Toyota Ex-Cab 4X4 3.0 Automatic

05-09-2007, 10:45 PM	#2
project88 Senior Member Join Date: Feb 2006 Posts: 135	i have a suggestion, but it could be completely wrong, knock sensor, basically a knck sensor will allow the timing to advance as far as it can, but when it detonates, senses a ping and retards timing. My knock sensor was unplugged for a while, never threw a code and had less power and ran rough, got it hooked up and worked fine. High idle could be lots of things, just my opinion tho, if someone disagrees, thats fine, i submit!

05-17-2007, 06:16 AM	#6
jrandalls Junior Member Join Date: Mar 2007 Location: alabama Posts: 9	does this truck still have a catalytic converter on it or could it be stopped up? I had a 93 with the 2.8, I removed the cat and had basially the same problems you are describing.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
6.0 Liter	slammedram97	Truck Classifieds	2	12-01-2006 07:45 AM
True Dual Exhaust for the 5.7 liter HEMI? Is it possible?	ch47hemi	Dodge Truck Forum	1	07-28-2006 07:15 AM
6.2 liter chevy diesel	chevyguy	General Truck Forum	10	07-05-2006 11:51 PM
97 Tahoe 5.7 liter starting problem	StevesTahoe	Chevy Truck Forum	0	06-07-2005 07:11 PM
7.3 Liter Chip and Exhuast Options	leathernmudf250	Ford Truck Forum	0	01-02-2005 04:04 PM