Cutting off going down the road - The 1947 - Present Chevrolet & GMC Truck Message Board Network

fun in dirt · 04-24-2024, 09:07 AM

My daily driver acts like it has a gremlin, please help!
2007 classic (cateye), 1/2 ton plain work truck, 4.3 V6.
206k miles & has been a great DD, but about a month ago it started just cutting off while I was going steady 60mph down the road. I felt a miss/ jerk several miles before for only a second & then ran smooth as silk again then it just cut off ... no check engine lights on or anything. Threw in N & coasted to the side. It would spin over & then after a few tries, crank back up & be perfect like nothing happened... maybe for even a week or so, then happen again.
Because of the initial jerking, I thought maybe fuel pump, but checked pressure & all that perfect. A co-worker said he had one acting similar & was the crank position sensor, since it was only $30 & 15 minutes, replaced that but did it again 2 days later. Last weekend replaced air filter (couldn't see the sun through it) & ignition relay (grabbing at straws), drove it Monday - Thursday (about 40 mile commute each day) with zero issues & was excited. Only for Friday afternoon going home to do it again - jerked once after about 10 miles from work, then cut off after about another 8 miles. Spin, spin & not crank (like no fire) then after sitting about 5-10 minutes it cranked like nothing wrong & made it home running smooth, no CEL or issues.
What else should I look for... any ideas?

**hatzie** · 04-26-2024, 07:05 PM

Look at some crank no start checklists and start testing.

Intermittents are miserable to find.

LDO · 05-03-2024, 11:46 AM

Quote:

Originally Posted by hatzie

Look at some crank no start checklists and start testing.

Intermittents are miserable to find.

Hatzie, sent you a PM.

fun in dirt · 08-14-2024, 03:22 PM

Update - I guess I found the issue, it's been about 3.5 months & still running with no problems (knock on wood).
Cleaned both ground location on block, at front on passenger side & on rear of drivers side - they were both pretty funky. Also cut some length off & put new ring terminal on ground wire from ign coil that was connected at front passenger block location - it was green corroded a few inches up the wire... that was probably the specific issue.

04-24-2024, 09:07 AM	#1
fun in dirt Registered User Join Date: Jan 2007 Location: Mississippi Posts: 2,122	Cutting off going down the road My daily driver acts like it has a gremlin, please help! 2007 classic (cateye), 1/2 ton plain work truck, 4.3 V6. 206k miles & has been a great DD, but about a month ago it started just cutting off while I was going steady 60mph down the road. I felt a miss/ jerk several miles before for only a second & then ran smooth as silk again then it just cut off ... no check engine lights on or anything. Threw in N & coasted to the side. It would spin over & then after a few tries, crank back up & be perfect like nothing happened... maybe for even a week or so, then happen again. Because of the initial jerking, I thought maybe fuel pump, but checked pressure & all that perfect. A co-worker said he had one acting similar & was the crank position sensor, since it was only $30 & 15 minutes, replaced that but did it again 2 days later. Last weekend replaced air filter (couldn't see the sun through it) & ignition relay (grabbing at straws), drove it Monday - Thursday (about 40 mile commute each day) with zero issues & was excited. Only for Friday afternoon going home to do it again - jerked once after about 10 miles from work, then cut off after about another 8 miles. Spin, spin & not crank (like no fire) then after sitting about 5-10 minutes it cranked like nothing wrong & made it home running smooth, no CEL or issues. What else should I look for... any ideas? __________________ '72 C to K20 "Cannibalizer" http://67-72chevytrucks.com/vboard/s...32#post8653432 '85 K30 "Big Nassy" [B]'85 C10 [B] "Corpse" '01 2500 Suburban ...party wagon & tow truck '06 Silverado SS...DD '06 C1500 WT...DD '07 Classic C1500 WT...DD Built & sold cause can't keep 'em all: '72 Blazer "The Bucket" http://67-72chevytrucks.com/vboard/s...d.php?t=433190 '55 Chevy straight axle gasser https://www.trifive.com/forums/showthread.php?t=173938 '69 Pro Street Chevelle http://www.chevelles.com/forums/showthread.php?t=332541 '86 M1031 CUCV http://67-72chevytrucks.com/vboard/s...d.php?t=553619

04-26-2024, 07:05 PM	#2
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: Cutting off going down the road Look at some crank no start checklists and start testing. Intermittents are miserable to find. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.

08-14-2024, 03:22 PM	#4
fun in dirt Registered User Join Date: Jan 2007 Location: Mississippi Posts: 2,122	Re: Cutting off going down the road Update - I guess I found the issue, it's been about 3.5 months & still running with no problems (knock on wood). Cleaned both ground location on block, at front on passenger side & on rear of drivers side - they were both pretty funky. Also cut some length off & put new ring terminal on ground wire from ign coil that was connected at front passenger block location - it was green corroded a few inches up the wire... that was probably the specific issue. __________________ '72 C to K20 "Cannibalizer" http://67-72chevytrucks.com/vboard/s...32#post8653432 '85 K30 "Big Nassy" [B]'85 C10 [B] "Corpse" '01 2500 Suburban ...party wagon & tow truck '06 Silverado SS...DD '06 C1500 WT...DD '07 Classic C1500 WT...DD Built & sold cause can't keep 'em all: '72 Blazer "The Bucket" http://67-72chevytrucks.com/vboard/s...d.php?t=433190 '55 Chevy straight axle gasser https://www.trifive.com/forums/showthread.php?t=173938 '69 Pro Street Chevelle http://www.chevelles.com/forums/showthread.php?t=332541 '86 M1031 CUCV http://67-72chevytrucks.com/vboard/s...d.php?t=553619



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