Anyone ever change out a crank position sensor?

1BadBowtie · Mar 25, 2017

I recently tested out my crankshaft position sensor (CPS) to see if it was working properly. I was having intermittent issues while starting and running. I am looking to replace it. I have read some posts where this can be a big pain in the a$$. Is there any hints, types or instruction in doing this? I have a 98 GMC Sierra k1500 with a 5.7L Vortec. Thanks.

Dan.

skylark · Mar 25, 2017

I've done several. The sensor is held in with one bolt. Typically you can pop them out pretty easy by just sliding a small flatblade between the timing cover and the bracket for the sensor. I use a bit of petroleum jelly on the new one and it slides right in.

1BadBowtie · Mar 25, 2017

I've been told that you have to perform a relearn on the engine. Is this true?

skylark · Mar 25, 2017

I've never needed to.

Kevmore007 · Feb 17, 2024

My 96 yukon left me stranded on the side of the hwy. The cps looks like this. I have no spark, but have fuel pressure at the test port.

Vikingdude · Feb 17, 2024

There are shims intended to get the air gap set correctly. I believe you're supposed to use a small piece of playdoh on the sensor, torque it down, and remove it to measure the gap. Check the FSM for exact details, I can't recall it offhand.

HotWheelsBurban · Feb 17, 2024

Vikingdude said:
There are shims intended to get the air gap set correctly. I believe you're supposed to use a small piece of playdoh on the sensor, torque it down, and remove it to measure the gap. Check the FSM for exact details, I can't recall it offhand.

Fortunately I have not had to reset the gap on my OBS 5.7 Burbs; changed the crankshaft position sensor on both. The O ring will hold it in snug(so it doesn't leak) but there is just one bolt on its bracket. IIRC it's a 7mm or 10mm, it's not a big bolt. Might be a bit less room to work on a 4x4; there is enough room on a 2wd.

Kevmore007 · Feb 24, 2024

It's an 8mm

HotWheelsBurban · Feb 24, 2024

Kevmore007 said:
It's an 8mm

Good to know, I knew it wasn't a real big one. I haven't had to replace it on my crew cab yet, and it's been a few years since I replaced it on the Burb.

Spareparts · Feb 24, 2024

The easiest way i found to measure the depth was with a micrometer. Measure from the timing cover where the CPS goes into it and make sure the reluctor is on one of the high points.
It's easy to measure the CPS insertable length, add a little math and you have the clearance, or lack of.

Anyone ever change out a crank position sensor?

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