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Old 08-22-2011, 10:36 AM   #1 (permalink)
dmax9
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please help, crankshaft position sensor 8.1l

I have an 2002 8.1 and I finally got my old crankshaft sensor out and purchased a new one from a NAPA store. The new one looks a little different, it has one o-ring at the top, instead of two like the original one and the part where the plug goes in turned in a different direction, just wondering if this is what its supposed to look like, I really donít want to put it in if itís the wrong one. Also did you guys put anything on that bolt that holds it in place, like a glue or anything, I thought I read that somewhere. thanks
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Old 08-23-2011, 12:29 AM   #2 (permalink)
CHEVYHD496
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call gm and have the PN cross referenced. i know the CKP sensor was updated. and i believe you use blue loctite on the bolt.
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New 8.1 with Raylar heads: build in progress

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Old 08-23-2011, 01:31 PM   #3 (permalink)
Manic Mechanic
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This is the one you should have from NAPA:
https://www.napaonline.com/Catalog/C...215905818&An=0

If it has the same overall size and the plug connects the same you can use it. There's only one sensor in GM like the 8.1's. Some things on this particular sensor like number of o-rings and angle of connector aren't critical as long as it still fits properly and works right. Make sure the harness is clear of anything after installed and pluged in allowing for 1 inch of movement in any direction.

Vernon
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Last edited by Manic Mechanic; 08-23-2011 at 01:33 PM.
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Old 08-24-2011, 09:23 AM   #4 (permalink)
dmax9
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Thanks guys, I got it back in last night and it started right up and ran fine on my test drive. Ive seen on other forums that they say you have to get it re-flashed by a dealer. Is this true? if so can a local auto repair shop re-flash or do I have to take it to a dealer. It seems to be running fine and there are no warning lights on or anything so Im wondering if that has to be done?
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Old 08-24-2011, 10:57 AM   #5 (permalink)
CHEVYHD496
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when you replace the CKP sensor you are supposed to do a crankshaft variation relearn. but most dont and get away with it. if the shop has a tech II scan tool or efi live, those can do it.
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02' Chevy 2500HD 496/Ally,EC/LB,4x4,3.73,07 tow mirrors,3" lift, 33" BFG,EFI LIVE self-tuned, AirRaid CAI,180' t-stat, .045 A/C Irridiums,MSD plug wires,Comp Cams 1.72:1 Roller-Tip rockers,Trick-Flo push rods,SW 1 7/8 LongTube Headers,Magnaflow Tru-X muffler,Magnaflow high-flow cats,dual 3" with 4" Silverline tips,Mag-Hytec diff cover and tranny pan,Detroit Trutrac Posi in rear, BBK TB back in the box-for now
New 8.1 with Raylar heads: build in progress

94' Chevy S10 2.2L/5spd RC/LB 2WD
71' Chevy C-10 402BBC/T400 RC/LB 2wd
72' Chevy C-20 402BBC/T400 RC/LB 2wd Cheyenne Super

Bigger Bore. Longer Stroke. Chevy Big Block
U.S. Marine Corps
0331 Infantry Heavy Machinegunner 06-14 OIF VET

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Old 08-24-2011, 11:02 AM   #6 (permalink)
freecableguy
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Quote:
Originally Posted by dmax9 View Post
Thanks guys, I got it back in last night and it started right up and ran fine on my test drive. Ive seen on other forums that they say you have to get it re-flashed by a dealer. Is this true? if so can a local auto repair shop re-flash or do I have to take it to a dealer. It seems to be running fine and there are no warning lights on or anything so Im wondering if that has to be done?

A CASE Relearn is required. EFI Live can do it. Scan tools that are capable of sending commands to the ECM/PCM can do it (ones that monitor or retrieve stream information only cannot). The dealer can do it for sure; but you'll pay for an hour of labor if you go there.

You need to get it done though. Although it won't cause any problems per se, failure to do so can result in less-the-optimum misfire detection by the emissions system.
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Old 08-24-2011, 01:01 PM   #7 (permalink)
dmax9
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My buddy says he has a tech 2 scan tool, so hopefully that'll do it. I really dont want to pay the stealership to do it, since it shouldve been recalled in the first place!
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Old 08-24-2011, 11:29 PM   #8 (permalink)
Manic Mechanic
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Quote:
Originally Posted by dmax9 View Post
My buddy says he has a tech 2 scan tool, so hopefully that'll do it. I really dont want to pay the stealership to do it, since it shouldve been recalled in the first place!

Ha, it was.

Vernon
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2001 Siverado 2500 HD SBCC in Black
GM Vortec 8100, Allison, 3.73, 4X4
Show mods: Goodmark SS cowl hood, Ranch Hand bumpers, black toolbox, full tint, 10" subs, amps.
Go mods: E85 fueled, Volant with home made ram air, BBK 80mm TB, Granetelli MAF, Marine Injectors, Hypertech, Bosch Fusion Iridium Plugs, Magnaflow 3" dual in X-path dual out muffler and tail pipes, Goodyear Wranger ATS 275's on 17" H2's, Velvet Ride Shackles, Helwig rear anti-sway bar. Complete frame up front end rebuild with Cognito: Leveling Kit, HD tie-rods, P&I arm braces, sway-bar links. Rancho shocks, Energy suspension control arm bushings, Napa Chassis steering components, Specialty Alingnment Products pins & adjusters, GM torsion crossmember bushings.
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Old 08-25-2011, 11:07 AM   #9 (permalink)
dmax9
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Quote:
Originally Posted by Manic Mechanic View Post
Ha, it was.

Vernon
I thought it was only for the 2001 model year? i know I sure have never received anything in the mail about a recall but the truck was 4 years old when I bought it so maybe the previous owner received something. I did call the dealership when this all started and they said there was no open recalls on my truck. But I dont know how long they keep recalls open, but you'd think on something like this it would always be there, but apparently not.
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2002 Silverado 2500HD
496 BB
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BROTHERHOOD OF HANDSHAKERS CLUB #121
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John Deere 4640
John Deere 6620 Turbo
Farmall 200-grandpa's
A lot of other GREEN equipment
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Old 08-25-2011, 12:16 PM   #10 (permalink)
Manic Mechanic
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If I remember correctly somebody on the forum said it was 2001-2002-1/2. I just looked it up and you're right, it was a 2001 only recall. How many miles did yours have on it? They all should be replaced every 100K in my opinion as maintainence.

By the way, your truck with 8.1 and ZF 6-speed is really rare. Enter your VIN at this web site to see what I mean. It's a GM VIN decoder with production figures. I don't know about 2002 but on in 2001 less than 800 6-speed HD's were built with the majority being 6.0's. Hang onto it.
http://www.compnine.com/vid.php

Vernon
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2001 Siverado 2500 HD SBCC in Black
GM Vortec 8100, Allison, 3.73, 4X4
Show mods: Goodmark SS cowl hood, Ranch Hand bumpers, black toolbox, full tint, 10" subs, amps.
Go mods: E85 fueled, Volant with home made ram air, BBK 80mm TB, Granetelli MAF, Marine Injectors, Hypertech, Bosch Fusion Iridium Plugs, Magnaflow 3" dual in X-path dual out muffler and tail pipes, Goodyear Wranger ATS 275's on 17" H2's, Velvet Ride Shackles, Helwig rear anti-sway bar. Complete frame up front end rebuild with Cognito: Leveling Kit, HD tie-rods, P&I arm braces, sway-bar links. Rancho shocks, Energy suspension control arm bushings, Napa Chassis steering components, Specialty Alingnment Products pins & adjusters, GM torsion crossmember bushings.
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