Knock sensor !!

[Goose]

I am guessing this is either a fuel issue or something like the O2 sensor.. the difference in power is the giveaway.. I travel from 5280 ft to 9300 ft elevation every day. and when the power is down you can tell..

[AMX69PHATTY]

As I understand the O2 sensor is the primary fuel mixture "determiner" and they can be "sensitive" to carbon build up. They only function in a narrow temperature range and have to heat up to like 700 or 800 degrees before they even start working. When started up cold, the ECU runs on a pre-determined fuel curve until the O2 heats up and kicks in. They can be checked with a multimeter for proper function I think but sometimes they're only like $30 or so, but they can also be pretty pricey. Saw a local ad where they were on sale at PepBoys.

[Goose]

yea this thing is wierd.. I wouldnt have thought being built in/for Canada would make it that different.. but this truck has day time running lights.. as well as the wierd engine controls.

[mrtazwrench]

I'm not sure how yours would be set up, but some of this new junk does not compensate as you go up in elevation while driving, some of them need a restart at your new elevation, I think this is mostly on fords but being here in the flatlands that is something I don't deal with.

[Goose]

Well to complete the saga, I began a scientific diagnoses of the problem (translation after 3 beers and about an hour staring at it like a chimp studying the space shuttle I unplugged, wiggled and replugged every sensorish looking device..) and presto.. no more pinging.. hows that for dumb luck..

[ironman_gq]

Thats the only true way to diagnose a problem Usually seems to satisfy curiosity and it only cost you a few beers which never hurt anyone anyway.

[Goose]

Well It just shows the old Computer advice is always best.. Reboot it!