Engine "gulp" - The 1947 - Present Chevrolet & GMC Truck Message Board Network

PitterPats72 · 09-04-2002, 08:12 AM

Was driving the 72 from the airport last night when I noticed I was going about 72 mph. I really didn't want to be going that fast so I let off the gas a bit. My engine took like 2 big gulps or coughs or you might say misses. I've had this happen before when I was giving it the gas but never when Iwas letting off the gas.

Any ideas why? I do have an HEI and a 4bbl Q-jet.

Thanks in advance. Pat

PitterPats72 · 09-04-2002, 02:54 PM

TTT

MandarinSixSeven · 09-04-2002, 04:03 PM

im no expert at this stuff at all, but do you know if your timing is all good?

**COBALT** · 09-04-2002, 05:59 PM

This only happens when you let off the gas? What about when you stomp it at a light or something? Does it hesitate or pop?

PitterPats72 · 09-04-2002, 11:54 PM

Last night was the first time it happened when I let off the gas. But it has happened before when I am giving it gas.

Pat

wcdrake · 09-05-2002, 04:00 PM

I dont know if this is the same thing but my 72 started doing this. It would do it once in a great while and when it did it was only a quick sputter. I continued to drive it and over the course of the summer, it would sputter when you were not expecting it. Here about a month ago, we were heavily loaded with camper and trailer when it coughed and then let out the most ferocious back fire. I was thinking there may be moisture under the cap and in doing so noticed the cap was very corroded. I replaced the cap and runs like a top and have not had any hiccups since. Good luck

**COBALT** · 09-05-2002, 04:30 PM

IGNITION!!!! Sounds like you need to inspect your cap, rotor, and points. You may have to haul out the feeler guage and dwel angle guage. Good luck.

09-04-2002, 08:12 AM	#1
PitterPats72 Registered User Join Date: Oct 2001 Location: Indianapolis, IN Posts: 145	Engine "gulp" Was driving the 72 from the airport last night when I noticed I was going about 72 mph. I really didn't want to be going that fast so I let off the gas a bit. My engine took like 2 big gulps or coughs or you might say misses. I've had this happen before when I was giving it the gas but never when Iwas letting off the gas. Any ideas why? I do have an HEI and a 4bbl Q-jet. Thanks in advance. Pat __________________ 72 Chevy Custom 10 Deluxe (78K mi.) 95 Nissan Maxima (195K mi.) 73 VW Beetle (owned since 78; 96K miles) Engine rebuild by me done! 73 VW Super Beetle -New to me- Bought from original owner! 84 Honda Nighthawk (2500 mi.) I know too much foreign stuff; I've owned American too and they lasted just as long.

09-04-2002, 02:54 PM	#2
PitterPats72 Registered User Join Date: Oct 2001 Location: Indianapolis, IN Posts: 145	TTT __________________ 72 Chevy Custom 10 Deluxe (78K mi.) 95 Nissan Maxima (195K mi.) 73 VW Beetle (owned since 78; 96K miles) Engine rebuild by me done! 73 VW Super Beetle -New to me- Bought from original owner! 84 Honda Nighthawk (2500 mi.) I know too much foreign stuff; I've owned American too and they lasted just as long.

09-04-2002, 04:03 PM	#3
MandarinSixSeven Seasonal Poster Join Date: Apr 2002 Location: Kelowna BC Canada Posts: 896	im no expert at this stuff at all, but do you know if your timing is all good? __________________ 67 GMC Short Step 350/4-Speed/3.08 Posi Front/Rear Sway Bars Kelowna BC, Canada Member of DTPW

09-04-2002, 05:59 PM	#4
COBALT Senior Member Join Date: Sep 2001 Location: Seattle, WA, USA Posts: 5,817	This only happens when you let off the gas? What about when you stomp it at a light or something? Does it hesitate or pop? __________________ '69 3/4 ton C20 2wd-350ci/TH400 '69 3/4 ton Custom 20 2wd-350ci/4sp Manual '99 2wd 5.7 Chevy Tahoe Seattle, WA.

09-04-2002, 11:54 PM	#5
PitterPats72 Registered User Join Date: Oct 2001 Location: Indianapolis, IN Posts: 145	new69owner Last night was the first time it happened when I let off the gas. But it has happened before when I am giving it gas. Pat __________________ 72 Chevy Custom 10 Deluxe (78K mi.) 95 Nissan Maxima (195K mi.) 73 VW Beetle (owned since 78; 96K miles) Engine rebuild by me done! 73 VW Super Beetle -New to me- Bought from original owner! 84 Honda Nighthawk (2500 mi.) I know too much foreign stuff; I've owned American too and they lasted just as long.

09-05-2002, 04:00 PM	#6
wcdrake Registered User Join Date: Jul 2002 Posts: 14	I dont know if this is the same thing but my 72 started doing this. It would do it once in a great while and when it did it was only a quick sputter. I continued to drive it and over the course of the summer, it would sputter when you were not expecting it. Here about a month ago, we were heavily loaded with camper and trailer when it coughed and then let out the most ferocious back fire. I was thinking there may be moisture under the cap and in doing so noticed the cap was very corroded. I replaced the cap and runs like a top and have not had any hiccups since. Good luck

09-05-2002, 04:30 PM	#7
COBALT Senior Member Join Date: Sep 2001 Location: Seattle, WA, USA Posts: 5,817	IGNITION!!!! Sounds like you need to inspect your cap, rotor, and points. You may have to haul out the feeler guage and dwel angle guage. Good luck. __________________ '69 3/4 ton C20 2wd-350ci/TH400 '69 3/4 ton Custom 20 2wd-350ci/4sp Manual '99 2wd 5.7 Chevy Tahoe Seattle, WA.



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