Truck Won't Idle right???? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Inklover17 · 03-10-2008, 02:59 AM

I finally got home from Kuwait and started tinkering with my truck. When I first started it up it idled real fast. So I changed the plugs/wires then in missed alot. I went back through and my buddy and I removed the Dist. cap I put it back on and looked through my wires to make sure they were in the right firing order. Now it will start but runs real rough and will die if you don't stay on the gas. What is my problem? Thanks

Longhorn Man · 03-10-2008, 03:54 AM

moving this to the truck forums... welcome home!
I would drouble... tripple check the firing order... pay close attention to the #5 and #7 plug wires... VERY commonly crossed.

jay6891 · 03-10-2008, 04:44 AM

You didn't knock a vacuum hose off did you? Oh yes, welcome back and thanks for you service.

**Boog** · 03-10-2008, 05:12 AM

Inklover. Altus Ark.? I don't know how long the truck has been sitting but the gas can be old and the fuel filter can be stopped up or as said it could be a vacumn leak. If it has a power brake booster remove the vacumn line and plug it to see if there is a leak in the booster and of course check any vacumn lines on the engine. If it's automatic it probably has a vacumn line running from the intake manifold down to the modulator valve on the trans. It will have a short length of rubber hose on each end of it. And welcome home.

neonlarry · 03-10-2008, 05:58 AM

Good suggestion above on the gas. Also just because you put in new plugs\wires does not mean they are good, pull one wire off at a time and see if there is one that doesn't change the idle. Might want to go ahead and change the cap and rotor since you did plugs\wires.
Vacuum leak, if its small, will usually just increase idle speed and make it hard to adjust the idle mixture screws.

69long"n"low · 03-10-2008, 11:03 AM

back to the gas when it goes bad it can really gum up the carb and plug your jets, if it only stays running when you hit the accelrator pump then id say pull the carb and give it a good cleaning

Inklover17 · 03-10-2008, 03:04 PM

Thank you Fellas I TALKED TO MY UNCLE (REALLLY GOOD MECHANIC) "He SAID Move your plug wires over one hole" I t fired like a champ! I backed down the Idle spring on the carb and it ran like a champ thanks fellas No w she's ready for Paint Go DURABAK!

jay6891 · 03-10-2008, 03:22 PM

Glad you got it fixed.

03-10-2008, 02:59 AM	#1
Inklover17 Registered User Join Date: Jan 2008 Location: Altus Posts: 17	Truck Won't Idle right???? I finally got home from Kuwait and started tinkering with my truck. When I first started it up it idled real fast. So I changed the plugs/wires then in missed alot. I went back through and my buddy and I removed the Dist. cap I put it back on and looked through my wires to make sure they were in the right firing order. Now it will start but runs real rough and will die if you don't stay on the gas. What is my problem? Thanks

03-10-2008, 03:54 AM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Truck Won't Idle right???? moving this to the truck forums... welcome home! I would drouble... tripple check the firing order... pay close attention to the #5 and #7 plug wires... VERY commonly crossed.

03-10-2008, 04:44 AM	#3
jay6891 Car Knocker Join Date: May 2001 Location: jefferson,arkansas Posts: 664	Re: Truck Won't Idle right???? You didn't knock a vacuum hose off did you? Oh yes, welcome back and thanks for you service. __________________ 68 c-10,91 sportside bed,350 .030 over,4 bolt,10-1 comp,2.05 intake/1.94 exhaust,1.6 Harland Sharp roller rockers,edelbrock rpm cam and intake w/750 carb, 700r4, 3.73 gears,Jacabbs Electronic Igntion w/Accel HEI distributer and super coil. ZR-1 roll pan, filled tailights. Blazer tank. Hidden hitch. 2 1/2" Flowmaster 40's. Parts bought but not installed>> ford 9" posi with disc. CCP front and rear lowering kit 4/5. Cab corners,foor boards,rockers, cab braces, Phatom grill, Painless wiring kit.

03-10-2008, 05:12 AM	#4
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,535	Re: Truck Won't Idle right???? Inklover. Altus Ark.? I don't know how long the truck has been sitting but the gas can be old and the fuel filter can be stopped up or as said it could be a vacumn leak. If it has a power brake booster remove the vacumn line and plug it to see if there is a leak in the booster and of course check any vacumn lines on the engine. If it's automatic it probably has a vacumn line running from the intake manifold down to the modulator valve on the trans. It will have a short length of rubber hose on each end of it. And welcome home. __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross

03-10-2008, 11:03 AM	#6
69long"n"low Registered User Join Date: Jan 2008 Location: SURREY BC, CANADA Posts: 278	Re: Truck Won't Idle right???? back to the gas when it goes bad it can really gum up the carb and plug your jets, if it only stays running when you hit the accelrator pump then id say pull the carb and give it a good cleaning

03-10-2008, 05:58 AM	#5
neonlarry Registered User Join Date: Feb 2002 Location: Vacaville, CA Posts: 2,745	Re: Truck Won't Idle right???? Good suggestion above on the gas. Also just because you put in new plugs\wires does not mean they are good, pull one wire off at a time and see if there is one that doesn't change the idle. Might want to go ahead and change the cap and rotor since you did plugs\wires. Vacuum leak, if its small, will usually just increase idle speed and make it hard to adjust the idle mixture screws. __________________ 70 C/10 Light Red 350/TH350, HEI, Duals w/40 series Flows, 91 seat, LED taillights 99 Pontiac S/C GTP, SLP Ram Air hood, GMPP Konis & springs 95 Neon ACR, MP PCM, AFX UDP, 3.0 CAI

03-10-2008, 03:04 PM	#7
Inklover17 Registered User Join Date: Jan 2008 Location: Altus Posts: 17	Re: Truck Won't Idle right???? Thank you Fellas I TALKED TO MY UNCLE (REALLLY GOOD MECHANIC) "He SAID Move your plug wires over one hole" I t fired like a champ! I backed down the Idle spring on the carb and it ran like a champ thanks fellas No w she's ready for Paint Go DURABAK!

03-10-2008, 03:22 PM	#8
jay6891 Car Knocker Join Date: May 2001 Location: jefferson,arkansas Posts: 664	Re: Truck Won't Idle right???? Glad you got it fixed. __________________ 68 c-10,91 sportside bed,350 .030 over,4 bolt,10-1 comp,2.05 intake/1.94 exhaust,1.6 Harland Sharp roller rockers,edelbrock rpm cam and intake w/750 carb, 700r4, 3.73 gears,Jacabbs Electronic Igntion w/Accel HEI distributer and super coil. ZR-1 roll pan, filled tailights. Blazer tank. Hidden hitch. 2 1/2" Flowmaster 40's. Parts bought but not installed>> ford 9" posi with disc. CCP front and rear lowering kit 4/5. Cab corners,foor boards,rockers, cab braces, Phatom grill, Painless wiring kit.

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