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By the way, thanks to everyone who have helped me over the years. I think I can finish stitch welding lower cab and rockers. I refuse to-weld on something that won’t run. Im probably gonna trial this to Toronto 800M round trip. If it runs well on next trip about 60 miles, with no hiccups, Im...

Sorry for confusion. With a new flight system pmd, it runs now isolating either. My known good pmds that were failed and one failing. The problem with a known good pmd, is that it’s good till it isn’t. I did that wacky stuff to weed out the failing pmd. I got a lot of years out of those flight...

Runs with cps off now, smoking but runs. Clears up upon adding plug. The tensioner was badly needed and was slipping. It was loose enough to rub material off the flat of the belt. Everything new that rotates, including Leroy billet pulley and fluiddampner.. Took a 20 mile jaunt, no fishbiting...

Today the belt and tensioner are getting changed. The belt has cracking in the v grooves and the tensioner is out of spec. The spring is worn out, and I think it is chinezeum and got a gm one off parts shelf.

I’ll report back on that.

A lot might be too strong an expression. It’s the only sensor that goes bad on truck. I’ve probably changed it twice since 2012. It’s the one code the ecm throws, that is trusted.

With OS unplugged it starts, but anything but smooth, I am glad cps works though, as I go through lots of those over the years.

What intent did I miss AK. Do you think optical sensor is bad? I am checking the wiring and signal today. I ferreted out what I thought was a working PMD. I believe an issue still exists. The IP is new from GM. What did I miss. Sometimes I can’t see the forest because of the trees.

With a known good pmd plugged on bumper/heatsink. I have to unplug easy to access sensors along with optical sensor. It will start and be a little smoky. Then I plug all the sensors in and it runs properly. I think the next ride I will bring my Polaris atv and ramps. Hopefully I can move on to...

The problem with truck is multiple issues. I found and re replaced a factory splice going to blue ecm plug. Then with a pmd mounted at plug by block. No start, I removed optical sensor and nothing . I removed the ait and maf plugs. It acts like it reset itself and wants to run off crank values...

I have a question for you, you ask this question in other posts. What ecm pin is the power, so I can monitor

I found a failing pmd on bumper, they are suspect always, so I try each test with known good pmd. Does anyone know what ecm wire is power, I need to monitor that circuit.

I thought I left a post here, but it might be on similar thread. I am targeting the plugs at ecm and studied pinout. One question, what pin is power in? Still stalling at temperature.

Thanks for info. I ordered a new Gm ffm to IP. I think that’s only original hose left, but out of caution, it’s getting replaced

One last thing, Biofuel is nonexistent in my neighborhood, but this truck is going to be in Canada again. Is2% biofuel going to melt my fuel line?

Today, I got the patience to get the pump timed, and got the electronics to gather data, I could use. The speedometer issue is next, besides carpet and headliner install

I have 2 pmds mounted to bumper with heat sinks, both on harnesses. I tried “extra” new one and plugged in by pump. Nothing.

I replaced the cps, and the old one is fine. When it started with optical sensor off, it had a bare wire from pinching. I think another one is pinched., will look. The fuel shutoff solenoid should be level for static, if I remember correctly. I also see me replacing the starter soon , as it is...

Update, still have a shutdown at operating speed, it needs to be retimed. Does anyone have a picture of the static pump scribe marks. The military mark makes no sense. Also, the speedo runs crazy fast , I put a new sensor in, but no change. I can’t believe it drove to Toronto last month...

One last point, the internet is littered with these posts, and nobody ever admits what was wrong.