engine skip/lugging help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

guitarfreak235 · 02-02-2013, 08:01 PM

ok so i recently did a rework of my exhaust with headers true duals etc. but after i finnished my truck lugs at low rpms and seems to be skipping. doesnt have a problem at idle or after i downshift. its mostly at about 40 mph when im cruisin in 4th. what should i look out for? how easy is it to mess up the spark plug wires? cuz its possible that the wires have fried against the headers but im not sure.

guitarfreak235 · 02-03-2013, 01:50 AM

anyone?

pwradder · 02-03-2013, 09:23 AM

most likely a wire isnt clipped on all the way, i would just swap them out for a new set though-i've seen a set of wires that looked fine cause a missfire. good luck.

guitarfreak235 · 02-03-2013, 11:49 PM

i guess ill do a comprehensive tune up and see how it goes....

85Bowtie · 02-04-2013, 12:23 AM

If it was a plug wire it should be running rougher at idle. You can let the truck idle and pull one plug wire at a time from the cap and see if the idle gets rougher. If it does, then that wire was working, if it does nothing, then that wire was the problem.

Have you touched the timing or any vacuum hoses?

guitarfreak235 · 02-04-2013, 11:34 AM

Quote:

Originally Posted by 85Bowtie

If it was a plug wire it should be running rougher at idle. You can let the truck idle and pull one plug wire at a time from the cap and see if the idle gets rougher. If it does, then that wire was working, if it does nothing, then that wire was the problem.

Have you touched the timing or any vacuum hoses?

havent touched the timing its at 6 degrees advanced. i removed the smog stuff when i did the exhaust system and put the headers on, so i had to cap some vacuum lines. its possible that some of the plastic ones cracked cuz i broke one and had to fix it...

ont_guy_38 · 02-04-2013, 12:20 PM

Double check your firing order just to make sure you didn't slip a wire on the wrong plug...sometimes it is very easy to do.

guitarfreak235 · 02-04-2013, 03:46 PM

Quote:

Originally Posted by ont_guy_38

Double check your firing order just to make sure you didn't slip a wire on the wrong plug...sometimes it is very easy to do.

i guess thats possible... but if that were the case atleast 2 would be wrong and that would seemingly cause more problems than i have

motornut · 02-04-2013, 04:43 PM

check the order
vacume advance could be sticking
may wana check the actuall metal tubes sticking out of the carb
some loosen and can pull out a bit changing hoses

and i think you may need to be still advanced
i think I'm up over 10 now...i just changed my distributer
runs better

1967gm4x4 · 02-05-2013, 01:42 AM

Spray a little penetrant on the vacuum lines to see if there leaking the idle will change if it is, I would also recheck your firing order just incase 2 got swapped.
Posted via Mobile Device

guitarfreak235 · 02-05-2013, 12:00 PM

Quote:

Originally Posted by motornut

check the order
vacume advance could be sticking
may wana check the actuall metal tubes sticking out of the carb
some loosen and can pull out a bit changing hoses

and i think you may need to be still advanced
i think I'm up over 10 now...i just changed my distributer
runs better

thanks for all the help everyone. but the factory recomends 4 degrees advanced (to reduce emmissions) i know advancing it further will increase power and even economy though so i will do that

02-02-2013, 08:01 PM	#1
guitarfreak235 Registered User Join Date: Mar 2012 Location: Spartanburg S.C. Posts: 21	engine skip/lugging help ok so i recently did a rework of my exhaust with headers true duals etc. but after i finnished my truck lugs at low rpms and seems to be skipping. doesnt have a problem at idle or after i downshift. its mostly at about 40 mph when im cruisin in 4th. what should i look out for? how easy is it to mess up the spark plug wires? cuz its possible that the wires have fried against the headers but im not sure. __________________ 2 inch add a leaf, bilstein 5100 shocks, 33" hankook dynapro mt's, flowtech headers true duals and terminator mufflers, 35w and 55w 6k hid headlights, 35w 3k foglights, complete led conversion, 2 kicker cvt 12's, soundstream rub5.800 amp, soundstream speakers

02-03-2013, 01:50 AM	#2
guitarfreak235 Registered User Join Date: Mar 2012 Location: Spartanburg S.C. Posts: 21	Re: engine skip/lugging help anyone? __________________ 2 inch add a leaf, bilstein 5100 shocks, 33" hankook dynapro mt's, flowtech headers true duals and terminator mufflers, 35w and 55w 6k hid headlights, 35w 3k foglights, complete led conversion, 2 kicker cvt 12's, soundstream rub5.800 amp, soundstream speakers

02-03-2013, 09:23 AM	#3
pwradder Registered User Join Date: Mar 2012 Location: stafford springs ct Posts: 149	Re: engine skip/lugging help most likely a wire isnt clipped on all the way, i would just swap them out for a new set though-i've seen a set of wires that looked fine cause a missfire. good luck. __________________ 1977 srw cc lb 396/700r/4:11's/6'' bds lift/ 35's. sold 1986 suburban 350/700r/3:73's 31's: parted out. 1980 silverado swb 5.3/700r/ 2'' drop/ daily driver. sold 1985 c10 long bed 5.3/700r/2'' drop/17" wheels/ daily driver. sold 1970 c10 long bed-new project! getting ready for the 6.0

02-03-2013, 11:49 PM	#4
guitarfreak235 Registered User Join Date: Mar 2012 Location: Spartanburg S.C. Posts: 21	Re: engine skip/lugging help i guess ill do a comprehensive tune up and see how it goes.... __________________ 2 inch add a leaf, bilstein 5100 shocks, 33" hankook dynapro mt's, flowtech headers true duals and terminator mufflers, 35w and 55w 6k hid headlights, 35w 3k foglights, complete led conversion, 2 kicker cvt 12's, soundstream rub5.800 amp, soundstream speakers

02-04-2013, 12:23 AM	#5
85Bowtie Registered User Join Date: Mar 2009 Location: TN Posts: 410	Re: engine skip/lugging help If it was a plug wire it should be running rougher at idle. You can let the truck idle and pull one plug wire at a time from the cap and see if the idle gets rougher. If it does, then that wire was working, if it does nothing, then that wire was the problem. Have you touched the timing or any vacuum hoses? __________________ '69 Dodge Charger R/T 440, 727, 3.55 Sure Grip '68 Plymouth Road Runner 383, 727, 3.23 Sure Grip '89 Dodge Diplomat ex cop car 408, 727, 3.55 Sure Grip '77 Dodge Monaco ex cop car 440, 727, 2.71 '79 Dodge 'Lil Red Express pickup 360, 727, 3.55 Sure Grip '12 Dodge Challenger SRT8 392, M6, 3.92 '85 Chevrolet C-10 SWB 2wd 305, TH350, 2.73

02-04-2013, 12:20 PM	#7
ont_guy_38 Registered User Join Date: Jul 2007 Location: Ontario Canada Posts: 1,006	Re: engine skip/lugging help Double check your firing order just to make sure you didn't slip a wire on the wrong plug...sometimes it is very easy to do. __________________ 1985 C10 2004 Avalanche

02-04-2013, 04:43 PM	#9
motornut 78K & 79C Jimmys Join Date: Nov 2009 Location: Ottawa Ont CANADA Posts: 7,901	Re: engine skip/lugging help check the order vacume advance could be sticking may wana check the actuall metal tubes sticking out of the carb some loosen and can pull out a bit changing hoses and i think you may need to be still advanced i think I'm up over 10 now...i just changed my distributer runs better __________________ John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350

02-05-2013, 01:42 AM	#10
1967gm4x4 Registered User Join Date: Jan 2013 Location: Pennsylvania Posts: 99	Re: engine skip/lugging help Spray a little penetrant on the vacuum lines to see if there leaking the idle will change if it is, I would also recheck your firing order just incase 2 got swapped. Posted via Mobile Device __________________ 1967 gmc 4x4 factory air factory buckets 1985 gmc high sierra 2500 4x4 400 1972 ford f250 4x4 390.Tomorrow is the most important thing in life. Comes into us very clean. It's perfect when it arrives and puts itself in our hands. It hopes we've learned something from yesterday. John Wayne



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