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03-16-2021, 02:40 PM | #1 |
Equal opportunity joke ofender
Join Date: Oct 2011
Location: Eastern Shore of MD
Posts: 9,922
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back with another issue
my 06 chevy express is acting up again. While riding down the road it acts like it is cutting off for a second then keeps on going. It got bad enough coming back from the job earlier I thought I was going to have to get it towed. It did it randomly last week but I could not find anything. I stopped at a gas station on the way back today and popped the hood. I noticed that the positive cable on the battery was a little loose so I tightened that up. Rode fine for a few miles then right back to it again. This time I noticed every time it seemed like it shut off the temp gauge would drop to zero and as soon as it hit back the gauge would come back up to normal. Several mile later it would be at 205-210* then it would fall to zero then jump up to about 260* on the gauge then after a minute or so would fall back to the 210 range. I am assuming it is a wiring/ground issue. Has anyone run into this before? It threw the check engine light so i checked that with the reader and it has code PO118 in it twice for temp gauge reading too high and then code PO455 for what I am seeing may be the gas tank vent valve 9which is apparently a common issue with these) I don't think either of the codes are the actual problem and most likely got thrown because of the erradic gauge?
It is a 6.0 automatic with roughly 185K miles Thanks
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03-17-2021, 05:28 PM | #2 | |
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Join Date: Jun 2017
Location: Cherryville, NC
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Re: back with another issue
Quote:
The ECM wire to ground should be cut off and replaced with a new (preferably Gold Series) connector that is soldered to the wire. Sandpaper the chassis well, plus any and all cables that may conncet at this point. Then look for and find every ground cable on the engine....some are under and near the engine mounts, some at rear of cylinder heads...each one needs to be cleaned very well....remove the bolt, clean the area and the connectors with sandpaper until shiny then reassemble. The temp gauge issues are pointing to bad grounds... Erratic readings of temp will cause the ECM to provide incorrect fuel mixtures and spark timing... Finally, remove both battery cables from the battery and clean the ends of each cable and the mounting points to the battery...
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03-17-2021, 05:57 PM | #3 | |
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Join Date: Oct 2011
Location: Eastern Shore of MD
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Re: back with another issue
Quote:
Thanks for the detailed reply on where I should be looking. I am hoping to get it all taken care of tomorrow or Friday.
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Members I have met. Dually Jams, OlBlue60, ScottH, Tommyboy24, Dujobo, Warbucket, 2003 Silverado, Notsolo, my90k5, 6t727t2, Special-K ,Jack_71C10, tabarcus,72blazer_mud_bogger,pwdcougar,RSavage,EricSean,1Rippen6,invicta455,tennaragtop71,arks, Kendal,Bennett68C10, Perpendicular, Chainsawman, McGeesCustomMinis,ShortbedClayton,longblue72,6768chevylover,Tim71,Travisarmenta,Ol' Drippy,fleetmitch,georgieb51,Dave,bcnya2,Dadsburb https://paypal.me/6772GMtruckparts Most women like the strong, silent type… Fortunately for me, my wife prefers the out-of-shape, mouthy type. |
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03-17-2021, 11:32 PM | #4 |
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Join Date: Dec 2011
Location: Moraga, CA
Posts: 809
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Re: back with another issue
Aussie nailed it.
One more grounding issue that bit me once in my '84 S10 was a bad ground to the dash. Erratic gauges and flickering gauge lights. Luckily it was an easy fix and I was super lucky because I accidentally bumped the wire with my leg and that forced the problem to be repeatable with the wiggling of the wire. It was a small ground strap that attached at the left-hand side bottom of the dash, right by the little bracket that attached it to the left kick panel. The vehicle was only about a year old at the time when I started noticing it, so probably loose from the factory. I only mention this because it's one more possible ground.
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(Very) Slow-Going Build Thread: Stock 1970 Short Step with Stock 1970 LT-1 http://67-72chevytrucks.com/vboard/s...d.php?t=567340 Last edited by mattfranklin; 03-17-2021 at 11:53 PM. |
03-19-2021, 05:28 PM | #5 |
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Join Date: Oct 2011
Location: Eastern Shore of MD
Posts: 9,922
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Re: back with another issue
I do believe this is my issue. The original one down where it attaches to the side of the engine block is loose it in the connector and the braided one that leaves there and goes to the frame is totally green with corrosion. I will pick up a new one in the morning. That bad boy is $50 While under there I also noticed the oil cooler lines have a lot of rust on the pipe sections so gonna go ahead and replace them as well.
Gotta wonder sometimes what engineers are thinking though, of all the places to mount the ground to the engine they pick directly behind the AC compressor. I hope the bolt is not longer than the gap. .
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Members I have met. Dually Jams, OlBlue60, ScottH, Tommyboy24, Dujobo, Warbucket, 2003 Silverado, Notsolo, my90k5, 6t727t2, Special-K ,Jack_71C10, tabarcus,72blazer_mud_bogger,pwdcougar,RSavage,EricSean,1Rippen6,invicta455,tennaragtop71,arks, Kendal,Bennett68C10, Perpendicular, Chainsawman, McGeesCustomMinis,ShortbedClayton,longblue72,6768chevylover,Tim71,Travisarmenta,Ol' Drippy,fleetmitch,georgieb51,Dave,bcnya2,Dadsburb https://paypal.me/6772GMtruckparts Most women like the strong, silent type… Fortunately for me, my wife prefers the out-of-shape, mouthy type. |
03-25-2021, 12:54 PM | #6 |
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Join Date: Jul 2015
Location: Warrenton VA
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Re: back with another issue
Check inside the protective covering of the positive cable. My old d-max had weird issues and I found at one of the batteries corrosion had built up inside and behind the bolt and contact surface. Had to hit it with a pick to notice what it was, clean em up really good and took care of my problems.
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71 c-10 Long Bed, under the knife for a No Limit Engineering Wide Ride Chassis Pack and coil over static drop. 07 Silverado Classic 2wd 95 Camaro 427SBC/TH350 |
03-25-2021, 04:51 PM | #7 |
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Join Date: Oct 2011
Location: Eastern Shore of MD
Posts: 9,922
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Re: back with another issue
I think the bottom of the negative cable is what the issue was. Here are a couple pics of what I took off. I am going out on the maiden drive in the morning and hope to have no issues.......but I know my luck and history with the truck lol
Biketopia there are no covers on the cable ends due to having the 35' boom on the truck. Several leads are run to the battery so the boots were in the way and removed
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Members I have met. Dually Jams, OlBlue60, ScottH, Tommyboy24, Dujobo, Warbucket, 2003 Silverado, Notsolo, my90k5, 6t727t2, Special-K ,Jack_71C10, tabarcus,72blazer_mud_bogger,pwdcougar,RSavage,EricSean,1Rippen6,invicta455,tennaragtop71,arks, Kendal,Bennett68C10, Perpendicular, Chainsawman, McGeesCustomMinis,ShortbedClayton,longblue72,6768chevylover,Tim71,Travisarmenta,Ol' Drippy,fleetmitch,georgieb51,Dave,bcnya2,Dadsburb https://paypal.me/6772GMtruckparts Most women like the strong, silent type… Fortunately for me, my wife prefers the out-of-shape, mouthy type. |
03-28-2021, 03:04 PM | #8 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,921
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Re: back with another issue
The 6.0L in my '06 Silverado was doing something similar, and it ended up being the crank position sensor.
Gary
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'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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05-08-2021, 07:08 AM | #9 |
Equal opportunity joke ofender
Join Date: Oct 2011
Location: Eastern Shore of MD
Posts: 9,922
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Re: back with another issue
thought I would come back and update this in case someone else runs into a similar problem. It ended up being the temperature sender wiring right near the plug. For some reason both wires had been cut at some point and were just twisted together with not even tape over them. Over the course of time, I assume from bouncing around, one of the wires was loosened up and I guess making intermittent contact. I bought a new pigtail from Rock auto and used heat shrink and it has not had any symptoms since. Now if Baltimore would fix their potholes so i quit losing hub caps ..............
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Members I have met. Dually Jams, OlBlue60, ScottH, Tommyboy24, Dujobo, Warbucket, 2003 Silverado, Notsolo, my90k5, 6t727t2, Special-K ,Jack_71C10, tabarcus,72blazer_mud_bogger,pwdcougar,RSavage,EricSean,1Rippen6,invicta455,tennaragtop71,arks, Kendal,Bennett68C10, Perpendicular, Chainsawman, McGeesCustomMinis,ShortbedClayton,longblue72,6768chevylover,Tim71,Travisarmenta,Ol' Drippy,fleetmitch,georgieb51,Dave,bcnya2,Dadsburb https://paypal.me/6772GMtruckparts Most women like the strong, silent type… Fortunately for me, my wife prefers the out-of-shape, mouthy type. |
05-08-2021, 09:09 AM | #10 |
Registered User
Join Date: Jan 2007
Location: vernon b.c.
Posts: 3,022
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Re: back with another issue
A old mechanic told me you have to be a electrician now to fix new cars and trucks
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05-13-2021, 11:56 AM | #11 | |
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Join Date: Dec 2011
Location: Moraga, CA
Posts: 809
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Re: back with another issue
Glad you found it. Thanks for closing the loop.
Quote:
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(Very) Slow-Going Build Thread: Stock 1970 Short Step with Stock 1970 LT-1 http://67-72chevytrucks.com/vboard/s...d.php?t=567340 |
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