Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Hi there, I am Cam. Does your truck set any codes? Any aftermarket power up devices like a chip installed?
OK, This could be a pain to find, but I do have a couple places for you to check.First the 2 large connectors on the drivers side valve cover. those are common for wiring or connection issues in or near the connectors that could under the right circumstances cause this. Second is the temp sensor top middle beside the upper rad hose . On your year of truck I have run into poor connections at the connector and intermittent sensor readings that caused a momentary change in reading which caused a reaction much like what you describe. Third is wiring hitting the side of the power steering pulley and chaffing.
I do a pin drag test. That is where we take a new terminal and push it in each terminal, then pull it back out to feel how much resistance there is. If its loose it will make a poor contact.
That is another option as well, but given the intermittent nature of the issue it will be hard to trace down. What I would do after the pin test is graph each sensor with the scanner and see if during the issue any of the readings drop out. then from there, determine which sensors drop out and find a common point. If its isolated then its likely the sensor or wiring to the sensor. IF its systemic then possibly a ground or ecm.
yes engine computer, and they do fail, not often but its not unheard of.
If you can make it skip that easily then I really would look for loose wiring. I would even move the wiring around while idling to see if you can make the issue happen.
It can be a very small needle in that haystack, but thats why watching and knowing which sensor drops out is the key.
WE can keep chatting on this thread about this issue at no additional cost. I will say up front that I am also a paramedic and sometimes get called out, so if I don't reply, its because I am likely busy.
OK, thanks, ***** ***** at some point provide a rating. Its the rating process that I get paid from as experts are third party to the website.
That or there is a break in the wires behind the connectors. I have seen broken wires on both sides. What I do is open the harness and pull gently on each wire. See if it stretches or gives. Otherwise that pin drag test will narrow it down for you.
Yes, grease works, If you can bend the terminal back, otherwise you replace the pin connector.
Sure if you have a picture of yours, that would be good. I know about the bulletins and had those in mind when I sent you looking there.
Oh that one is on the FICM bracket.
Thats typical. Tape each wire then put a section of rubber hose to insulate that area and prevent it from happening again.