Found why I had no power at Diagnostic port, Some one prior had installed an Alarm or a Payment Device, that used a jumper (Obd2 male to Female) that scavenged Power and ground from the Obd connector, had come unplugged from the vehicle harness. I still have an issue with the engine running like it is in limp mode, will rev to around 2000 rpm and then fade and pulse, I have rechecked timing and I have ohm'ed out all sensors and replaced the IAC valve and have also checked the Compression, 190-193 on all cyl. Fuel pressure is around 65 psi at idle and did not drop when revved,
I plan on replacing the maf and Cam position sensors. I have read on another forum that a bad oil pressure check valve could cause the Hydraulic lifters to hold the valves open and cause lack of compression when revved, I have had the Vacuum line off of the brake booster, to check vacuum and when revved the vacuum drops and will Blow when the engine starts to fade at higher rpm,
Any thoughts or suggestions?
Tuesday, December 8th, 2015 AT 11:06 PM