Woowee. What a little event I had with my '07 4.2 on the way home from the beach yesterday.
Driving on the highway about 60 mph suddenly I felt the engine lose power, followed the Check Gauges light and CEL coming on (could have been more but again, was driving 60 on a highway and was in a curve), a low pressure oil warning shortly after on the text display (gauge was solid at 50 psi) and then within 2 seconds everything was back to normal except that the tach was reading 0. Truck kept driving normally for a few minutes after so I decided to keep going to home (about 6 miles).
Got home. Shut her off, let sit for a minute and restarted the truck and tach was still at zero. Now a CEL was showing so broke out the OBDII reader but realized I hadn't paired it with my new phone yet, so shut her off, brought stuff from car inside and went back out after about 5 minutes. I restarted the car after pairing the OBDII and read a P-0335 code. Uh oh. Shut her down and did some reading. Restarted her again and checked wiring harness at PCM.
Later in day left for grocery shopping and after start-up CEL cleared. No issues starting, no issues with misfires or other odd engine behavior.
Any thoughts? From what I read this could be anything from an ignition harness issue (plausible as I do have a remote starter installed...yes all the connections are soldered), to a loose ground somewhere or it could be the CKP or it's harness or a damaged reductor wheel. The initial randomness of problem with the dash lights makes me think a harness issue but I guess that if the PCM saw a CKP fault it could have caused a cascading set of issues? Curious on peoples thoughts.
FYI: Currently 146k miles. I do have front hubs set on my to-do list that occasionally cause mild vibrations when turning so maybe something got loosened?
Driving on the highway about 60 mph suddenly I felt the engine lose power, followed the Check Gauges light and CEL coming on (could have been more but again, was driving 60 on a highway and was in a curve), a low pressure oil warning shortly after on the text display (gauge was solid at 50 psi) and then within 2 seconds everything was back to normal except that the tach was reading 0. Truck kept driving normally for a few minutes after so I decided to keep going to home (about 6 miles).
Got home. Shut her off, let sit for a minute and restarted the truck and tach was still at zero. Now a CEL was showing so broke out the OBDII reader but realized I hadn't paired it with my new phone yet, so shut her off, brought stuff from car inside and went back out after about 5 minutes. I restarted the car after pairing the OBDII and read a P-0335 code. Uh oh. Shut her down and did some reading. Restarted her again and checked wiring harness at PCM.
Later in day left for grocery shopping and after start-up CEL cleared. No issues starting, no issues with misfires or other odd engine behavior.
Any thoughts? From what I read this could be anything from an ignition harness issue (plausible as I do have a remote starter installed...yes all the connections are soldered), to a loose ground somewhere or it could be the CKP or it's harness or a damaged reductor wheel. The initial randomness of problem with the dash lights makes me think a harness issue but I guess that if the PCM saw a CKP fault it could have caused a cascading set of issues? Curious on peoples thoughts.
FYI: Currently 146k miles. I do have front hubs set on my to-do list that occasionally cause mild vibrations when turning so maybe something got loosened?
