Truck running funny - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Midlothian Electric · 03-23-2007, 10:43 PM

71 GMC 350 - Finally got my mechanic to fix the brakes and pack a wheel bearing. So with the weather being nice, I decided to go cruzing while completing some errands. Since I'm used to driving a 93 GMC Vanudra, I think I may have pushed it too hard. Speedometer read 80, GPS said 70. When I got off the turnpike, IT started acting funny, cutting off at the traffic lights. Then when I got to my destination, it cuts off. I restart, idles fine, put in drive, and cuts off again, start it again, put in drive cuts off again. I mamange to get it into a parking space, go do my business come back 20 minutes later, and It's running fine. Any thoughts, ideas?

krue · 03-23-2007, 10:49 PM

Does it sputter or just die? While it stay running if you give it gas while holding the brake and shifting? Is it HEI or points?

RACINJASON22 · 03-23-2007, 10:54 PM

Have your local parts store check the control modue for ya. They do funny things some times. I know it should not have any thing to do with the tranny but it controls many aspects of the ignition at different engine speeds. So if your idle drops when you put your truck in gear it could be the moduel. If you are not running an HEI I have not a clue as I have verry little experience with points. RJ22

chevy50 · 03-23-2007, 10:55 PM

Just a wild guess,maybe vapor locked? Check your fuel line and see if its close to a heat source.

84_4x4 · 03-23-2007, 11:08 PM

I've heard of torque converters doing this before maybe you should check fluid level and make sure your trans fluid is not low or overheating Good Luck though

EAST SIDE LOW LIFE · 03-24-2007, 12:09 AM

Quote:

Originally Posted by Midlothian Electric

71 GMC 350 - Finally got my mechanic to fix the brakes and pack a wheel bearing. So with the weather being nice, I decided to go cruzing while completing some errands. Since I'm used to driving a 93 GMC Vanudra, I think I may have pushed it too hard. Speedometer read 80, GPS said 70. When I got off the turnpike, IT started acting funny, cutting off at the traffic lights. Then when I got to my destination, it cuts off. I restart, idles fine, put in drive, and cuts off again, start it again, put in drive cuts off again. I mamange to get it into a parking space, go do my business come back 20 minutes later, and It's running fine. Any thoughts, ideas?

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Does your tranny draw vacuum off your intake??? If so could be a vacuum leak. Just a guess.

esll.

dwaite72lnghrn · 03-24-2007, 07:34 AM

I would check the mechanical advance in the distributor sounds like it stuck full advance and then released after it stopped for awhile.

lowrollin70gmc · 03-25-2007, 01:13 AM

Check the fuel line and it's proximity to heat sources. Mine did the exact same thing a few years back, had to reroute the fuel line and filter away from the rad hoses.

**special-K** · 03-25-2007, 08:35 AM

Definately operating temp related.I suspect carburation or torque converter.Could be vacuum or fuel/air.Doesn`t sound major.

03-23-2007, 10:43 PM	#1
Midlothian Electric Registered User Join Date: Sep 2006 Location: Midlothian, VA Posts: 50	Truck running funny 71 GMC 350 - Finally got my mechanic to fix the brakes and pack a wheel bearing. So with the weather being nice, I decided to go cruzing while completing some errands. Since I'm used to driving a 93 GMC Vanudra, I think I may have pushed it too hard. Speedometer read 80, GPS said 70. When I got off the turnpike, IT started acting funny, cutting off at the traffic lights. Then when I got to my destination, it cuts off. I restart, idles fine, put in drive, and cuts off again, start it again, put in drive cuts off again. I mamange to get it into a parking space, go do my business come back 20 minutes later, and It's running fine. Any thoughts, ideas? __________________ Quenton Lee Midlothian Electric Comapny Inc. Electrical Contractors Since 1965

03-23-2007, 10:49 PM	#2
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,450	Re: Truck running funny Does it sputter or just die? While it stay running if you give it gas while holding the brake and shifting? Is it HEI or points? __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

03-23-2007, 10:54 PM	#3
RACINJASON22 GEARHEAD Join Date: Jan 2007 Location: CENTRAL,PA Posts: 2,284	Re: Truck running funny Have your local parts store check the control modue for ya. They do funny things some times. I know it should not have any thing to do with the tranny but it controls many aspects of the ignition at different engine speeds. So if your idle drops when you put your truck in gear it could be the moduel. If you are not running an HEI I have not a clue as I have verry little experience with points. RJ22 __________________ 72 SWB 2WD MY PROJECT 72 LWB 4X4 FUTURE PROJECT SUBSCRIBE HEREBOARD VENDORS HERE NORWOOD MEET SURVIVOR!

03-23-2007, 10:55 PM	#4
chevy50 New Member Join Date: Apr 2006 Location: west virginia Posts: 29	Re: Truck running funny Just a wild guess,maybe vapor locked? Check your fuel line and see if its close to a heat source.

03-23-2007, 11:08 PM	#5
84_4x4 Registered User Join Date: Oct 2006 Location: Louisville Ky Posts: 179	Re: Truck running funny I've heard of torque converters doing this before maybe you should check fluid level and make sure your trans fluid is not low or overheating Good Luck though __________________ 1971 c10 350ci long bed fleet side

03-24-2007, 07:34 AM	#7
dwaite72lnghrn Registered User Join Date: Jun 2002 Location: central pa Posts: 1,525	Re: Truck running funny I would check the mechanical advance in the distributor sounds like it stuck full advance and then released after it stopped for awhile. __________________ 72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper 72 bug(the better half's) under reconstruction 2009 HHR aqua blue 71 GMC k20 350/sm465 2009 Chevy hd3500 6.6 Victory Red crew cab dually Dave & Jeanne

03-25-2007, 01:13 AM	#8
lowrollin70gmc Too many projects Join Date: Mar 2004 Location: Fargo, ND land of the flat hills Posts: 1,147	Re: Truck running funny Check the fuel line and it's proximity to heat sources. Mine did the exact same thing a few years back, had to reroute the fuel line and filter away from the rad hoses. __________________ Andrew 84 GMC C1500 SWB 6.2 Diesel/700R4/3.42 "Grandpa's odd duck" 70 GMC C1500 LWB My first truck: shaved, bagged, and more: the lowrollin70gmc 68 K20 Suburban 12V Cummins/NV5600/NP205/D60/11.5AAM 3.73s "Dakota Cadillac" 63 Chevy II Nova Coupe 250 I6/T56/4.56s "Economy car" 53 Willys Wagon 350/NV4500/BW4401/HP D44/9inch “Winter Wagon” 30 Model A 16 Focus ST Last edited by lowrollin70gmc; 03-25-2007 at 01:14 AM. Reason: spalin'

03-25-2007, 08:35 AM	#9
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,861	Re: Truck running funny Definately operating temp related.I suspect carburation or torque converter.Could be vacuum or fuel/air.Doesn`t sound major. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~



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