Crank shaft sensor?

I had very similar history many years ago, replacing similar components, now chasing cause for two backfire like big band events.

I have a 02 s10 4.3 same thing changed everything even the ecu an mine will throw a po304 random misfire my pipes are turning black so I'm thinking I have a harness problem now as well

Todd, when I lifted the body on my 05 to replace my engine, I found a bunch of damaged loom and burnt wire. I went through and repaired it all and it solved all of my ghosts and gremlins!

So you just guessing

Good catch outta left field... If you don't have a nick name I'll call ya Ken Griffey Jr😮

Im checking this tomorrow!!!!

"Started to doubt my technical abilities " You sound more like a cannon launcher than anything.

I swear I hope this is the issue with my 2000 Astro. If I see my fuel gauge bouncing around after I start the van I know I'm in for some misfiring. If its bad I smell something electrical. I also hear some clicking that sounds like sparks where your problem was. Is there a new harness that I could buy?

Great job on fixing that vehicle! You are awesome! A real professional! You're lit.

Nice 👍💪🫡

I guess I'll have to check this too. My 2000 Astro just had a new Jasper engine and all the rebuild kit installed but it misfires badly in wet conditions. It's driving me nuts.

Never did find out the problem and sold the van.

Holy shit

Holy shit

crank shaft sensor

Only the Great ones Lose Sleep, Great Job my Dude!

Way to persevere bro!

Thank you for sharing! An intermittent misfire is aggravating. You change this or that but still, misfires. Only on D, ok on N or R. I have the same problem. I will start looking for a short somewhere! Glad you found it, Todd.

I also am in the midst of being in this rabbit hole,I will check on this right away. Thanks for sharing with the GM Community cheers.

nice found thanks for the video hi from oaxaca mexico body

Voila! Sob omg wtf I'm with ya all the way yep harness same spot same shit I put foam black around it 2dollar fix

thank you very much.

I have 2001 Jimmy 4.3 L and it misfires random under load or high revs. I give up. I am not going to get the parts cannon out and shotgun this POS. I will keep driving. I may change the cap and rotor but that's it. My blazer had the same problem Also during damp or high humidity times. I did notice you never mentioned replacing the ICM. I might try that.

That's crazy! Can't believe you found that.

Neat

25hrs.. man that a bill i wouldnt want to pay. for finding out its only a wire... lol

nice work!!!!

Phantom misfire 💀💀💀

Thank you for this video! I have a Oldsmobile bravada 1999 4.3 liter and I'm having a similar problem.

I have an '01 Jetta. For 5 years I would intermittently lose my AC compressor function. Checked compressor, pressure switches, dash switch, fan relay (it's all routed together), etc. fan temp switch, ambient temp sensor etc. I tell my tech I'm frustrated with the problem so just change anything that was still original. He goes to check the fan/radiator temp switch and compressor kicks on. There was hidden corrosion back from the terminal. Road vibration would make the circuit open and close at random. fixed that wire and I've had no trouble for past 10 years. what a hassle it was dealing with that.

Thanks buddy I appreciate your video

Good find. I really don't like shit like that either. If I had thought about it when I was 15 years old and started working on vehicles in a shop back in 1988 and wrote down all the goofy crap like this that I have repaired, it would be an encyclopedia. You obviously have the patience, determination, dedication and knowledge to call yourself a true professional. You and I are the type of guys that have forgotten more things about repairing automobiles than most so called mechanics will ever know. Just in writing this now is bringing back so many memories of silly shit it's making my brain hurt. Good job and don't ever give up! We're among the last of a dying breed.

Thank you for the good detective work. I will keep that in mind!

Good one that's F^#&up great video

Thank you I have the same problem in my 2000 safari random misfire and I can not for the life of me figure it out.

Gracias por la information

astro van is pain in the ass

WOW. What a PITA to figure out. Great work!

Great job! Now that's a real mechanic that doesn't give up.

My 2000 Blazer is doing the exact same thing! Should I check the main wiring harness from the PCM to the engine?

I just bought a 98 and have a multiple miss on all cylinders, I don't believe it's the engine as it sounds like an ignition miss,.I haven't thrown any parts at it but will start with inspection of the harness

Having the same problem I can move the harness above air intake it will start running funny I will start looking in the morning thanks

I've been driving/repairing these vans for 28 years and have not heard of this issue before. Thank you for the video adding a bit more Astro knowledge to my repair arsenal.

Good detective work. I will check my 2000 astro for a similar problem.

I had a misfire at idle 2years ago. I replaced plugs wires icm, cap & rotor. No change but while driving without the dog house i noticed the engine moving & shaking along. I found & replaced the left side engine mount. Problem went away,now 2 years later misfire came back. While driving without the dog house I see I've got another broken motor mount. This is crazy but I wonder if vibration of the engine hitting the frame could be triggering the knock sensor? I haven't replaced it yet due to weather but am crossing my fingers.

did you change the whole harnes or just isolated and soldered the cable?

GREAT VIDEO OF REAL HELPFUL INFORMATION! UNTIL YOU SHOWED THAT WIRE, I TOO WAS LIKE WTF!!!

Hey Todd. Do you still do side work. I have a 2011 Ford Fiesta and need to have the TPMS module programmed. I put in a used module and now have a VIN mismatch. I’m having a recall done next Wednesday at 2 PM at Schmit Bros and wondered how much you would want to flash the module for me with the IDS?

It just great for this sharing thks