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Thread: po343 code and 8.1l
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12-27-2008, 09:57 AM #1
- Join Date
- Oct 2005
- Location
- liberty,tx
- Age
- 46
- Posts
- 9
po343 code and 8.1l
I have a 2001 chevy 2500hd with the 8.1L with allison. Service engine light came on and replaced the camshaft position sensor and the fuel filter. Code still comes back.
Truck idles fine and has power to 3000 rpm while driving in drive.
Truck will not go over 3000 rpm in park. I can get over 3000 rpm when manually shifting through the gears. Truck will start fine when cold but have to hold gas pedal to start to when warm. There is no black smoke or smell of fuel. Truck does not die or idle like it has skipped timing.
Any suggestions would be appreciated.
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07-18-2012, 08:22 PM #2
- Join Date
- Jul 2012
- Location
- La Plata, MO
- Posts
- 1
Hello, I have a truck with the exact problem, did you happen to figure it out?
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09-01-2012, 03:14 PM #3
When you replace either the cam or the crank position sensor, you need to run the relearn proceedure, that is both the sensors need to be in relationship to each other, so the timing will be correct. I believe it has to do with finding "top dead center" on #1 cylinder.
In order to run the relearn proceedure you need a special machine, I believe it is called a "Tech II" or equivilant.
I had my cam sensor replaced, and the local mechanic ran the relearn proceedure for me.
SteveCLast edited by SteveC; 09-01-2012 at 03:16 PM.
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09-01-2012, 09:48 PM #4
- Join Date
- Jun 2011
- Location
- Branchville, NJ
- Posts
- 3,111
Silver & Blue- 02 Camaro SS, 04 GTO
It just goes to show that car manufacturers do not want us under the hood. They want the vehicles back at the dealerships to help out the franchise owners. Thank God for companies like Snap On who make these special tools that allow us to make a choice for repairs. The only time your vehicle should go back to the dealer is for warranty work or to be traded in. JMO.
My ride is a 2002 Camaro SS SLP #3296 with 30k, LTH, 3" Y, CME, Frost tune, K&N, ported TB, Blackwing lid, Bellows, MSD, Denso Iridium, and 85mm MAF, Bilsteins, Eibach springs, SLP strut brace, Adj. Panhard, TA Girdle, UMI, Pro 5.0, Nitto NT555
My wife has a 2004 GTO with the rare SAP, 18" wheels, K&N Cold Air System, MSD, Ported TB, Frost tune, Denso Iridium, Flowmaster cat-back, 3200 Yank, 75k
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09-02-2012, 04:20 AM #5
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09-02-2012, 05:27 AM #6
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09-04-2012, 06:14 PM #7
I cant remember how many threads I've read where people got on one of these boards and ended up throwing a ton of parts at a problem, spending alot more than it would have been if they had just taken it to a qualified dealer tech who could diagnose it for a flat fee. And not everyone has the means or the skills to fix their newer car. Do some people get screwed? Yep. But not all dealerships are like that.
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