Quote:
Originally Posted by richard2717
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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I have found the biggest issue with these around your mileage is poor grounds and or corroded connectors especially the ECM ground wire that attaches to the chassis down under the radiator support along with the main battery ground cable....
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...
