Bad idle =\ ...advice? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

^No[z] · 05-17-2003, 04:44 PM

Well, contrast to the topic, I dont mean idle when I start the truck, but Ive been having a problem for quite a while now...

Usually doesnt happen unless I travel more than 8-10 miles, but usually once the truck is warmed and I have been drivin for a bit in speeds > 50mph and I come up to the stop I idle real rough (for lack of a better word) the whole truck vibrates and sometimes it dies on me and have to restart...I can usually avoid it from dyin by keepin the rpm's up or shifting to neutral while im at a light (auto tranny) and its even worse when I have the a/c running on it...any thoughts?

MSL · 05-17-2003, 04:55 PM

Sounds like you need to adjust your idle up. what carb do you have. you might need to do some tunning.

^No[z] · 05-17-2003, 05:32 PM

I had it adjusted like 6 months ago, =\ and its the q-jet

^No[z] · 05-17-2003, 09:17 PM

^bump ...anyone?

apstguy · 05-17-2003, 10:38 PM

Stuck EGR valve? Test it by taking and plugging the vaccuum hose that goes to the EGR valve. Might just take out the valve and see if it is stuck inside as well.

apstguy · 05-17-2003, 10:39 PM

Oh just remembered - a stuck PCV valve will do that too. Take the PCV valve out and shake it. If it doesn't rattle replace it.

^No[z] · 05-17-2003, 10:50 PM

oh, sorry btw my truck is a 79' c10 stepside 350/th350, q-jet

jimfulco · 05-18-2003, 01:27 AM

Have you tried to re-adjust the idle at the time it's acting up?

pkbinplano · 05-19-2003, 07:31 PM

how bout a stuck choke ???

bpmcgee · 05-20-2003, 03:22 PM

Don't forget that for an automatic, you're supposed to set your idle speed with it in gear, and with teh A/C (if any) running.

Brian

jimfulco · 05-21-2003, 03:11 AM

& completely warmed up.

05-17-2003, 04:44 PM	#1
^No[z] Registered User Join Date: May 2003 Posts: 14	Bad idle =\ ...advice? Well, contrast to the topic, I dont mean idle when I start the truck, but Ive been having a problem for quite a while now... Usually doesnt happen unless I travel more than 8-10 miles, but usually once the truck is warmed and I have been drivin for a bit in speeds > 50mph and I come up to the stop I idle real rough (for lack of a better word) the whole truck vibrates and sometimes it dies on me and have to restart...I can usually avoid it from dyin by keepin the rpm's up or shifting to neutral while im at a light (auto tranny) and its even worse when I have the a/c running on it...any thoughts?

05-17-2003, 10:38 PM	#5
apstguy LED King Join Date: Jan 2003 Location: Sacramento, CA Posts: 2,088	Stuck EGR valve? Test it by taking and plugging the vaccuum hose that goes to the EGR valve. Might just take out the valve and see if it is stuck inside as well. __________________ 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

05-17-2003, 10:39 PM	#6
apstguy LED King Join Date: Jan 2003 Location: Sacramento, CA Posts: 2,088	Oh just remembered - a stuck PCV valve will do that too. Take the PCV valve out and shake it. If it doesn't rattle replace it. __________________ 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

05-19-2003, 07:31 PM	#9
pkbinplano pkbinplano Join Date: Nov 2002 Location: Plano Texas Posts: 370	how bout a stuck choke ??? __________________ http://www.picturetrail.com/gallery/...7496&members=1 84 chevy silverado aka The Bananna Boat

05-17-2003, 04:55 PM	#2
MSL Registered User Join Date: Mar 2003 Location: So.Oregon Posts: 765	Sounds like you need to adjust your idle up. what carb do you have. you might need to do some tunning.

05-17-2003, 05:32 PM	#3
^No[z] Registered User Join Date: May 2003 Posts: 14	I had it adjusted like 6 months ago, =\ and its the q-jet

05-17-2003, 09:17 PM	#4
^No[z] Registered User Join Date: May 2003 Posts: 14	^bump ...anyone?

05-17-2003, 10:50 PM	#7
^No[z] Registered User Join Date: May 2003 Posts: 14	oh, sorry btw my truck is a 79' c10 stepside 350/th350, q-jet

05-18-2003, 01:27 AM	#8
jimfulco Registered User Join Date: May 2003 Location: Shreveport LA Posts: 3,170	Have you tried to re-adjust the idle at the time it's acting up?

05-20-2003, 03:22 PM	#10
bpmcgee Registered User Join Date: Mar 2003 Location: Northern Illinois Posts: 2,181	Don't forget that for an automatic, you're supposed to set your idle speed with it in gear, and with teh A/C (if any) running. Brian

05-21-2003, 03:11 AM	#11
jimfulco Registered User Join Date: May 2003 Location: Shreveport LA Posts: 3,170	& completely warmed up.



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