Crank sensor

[Swimmer8366]

Can I replace my crankshaft position sensor in my 2002 6.0 with out doing a relearn after words. For a couple days till my scan tool comes in?

 

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[Jsdirt]

I hear it's a crapshoot - some will run, some won't, and some run very poorly.

 

I'm not much of a gambling man, so if it were me, I'd wait a couple days.

[Swimmer8366]

They won't run? Never heard that one. I would think I just wouldn't have misfire data.... and if it doesn't run after replacement than how would I crank relearn. It has to be running no?

 

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[Jsdirt]

Heard that on the net, so don't take that as gospel. Someone probably bought one at Advance Auto and was defective out of the box, more than likely.

 

Yes - it does need to be running to do a crank relearn. If it's not running you'd have to figure out why.

 

Nice of GM to make these things so simple for us, ain't it?

 

 

I've always been told a crank relearn was needed whenever the timing cover or sensor is disturbed. I put a new sensor AND cover on a '96 Tahoe once, and once we figured out the junkyard had sold us a computer that wasn't flashed for a V8 engine, the truck ran perfect. No cam/crank correlation codes either. Hopefully you have the same luck with this one.

[Swimmer8366]

One can only hope it's in hope of fixing this damn p0300

 

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[Swimmer8366]

It has all the signs of a bad crank sensor, longer crank on start up, hesitating during acceleration, stumble at idle, misfire. Just no damn crank sensor codes.

 

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[Jsdirt]

If the crank sensor, or even the cam sensor was truly bad, you'd be parked with a no-start.

 

Lots of things can cause the 0300 - intake leaks are one of the most common causes, MAF sensor would be a close second. Really bad o2 sensors can do it too, but both would have to be bad at the same time - you'd have known a long time ago when the first one was failing, so not as likely.

 

I would get a scan tool on there and check your fuel trims with a cold engine vs. a warm engine - if they're reading high, then get better as the engine warms up, that's a classic intake gasket leak. Can confirm it by spraying water along the gasket surface and listen for it getting sucked in.

 

Worn plugs, and old wires, (and cap/rotor if equipped), a bad fuel pressure regulator, or a failing fuel pump will cause extended crank times too.