Question about 2002 GMC Sierra 1500

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GMC Sierra 2002 4.3 V6 P1345

I just bought this truck about 2 months ago. Just recently the SES light came on. Had it read. Turns out to be a P1345 code. I have replaced both the cam and crank sensors. Since then when first accelerating at very low rpm's I can feel the misfire. Or at high speeds(70-75) around 2000rpms the same misfire happens. I got off the highway when this happened. Had the truck scanned again. Same code P1345 and a misfire code. I have recently(past 2weeks) changed the plugs wires cap and rotor(same time as the cam sensor).

With the recent plugs wires cap rotor and cam sensor the truck ran fine for a couple of days then the P1345 came back. The truck ran fine. Had the scan tool hooked up and it cycled and no misfires. About 4 days later the light came back on again(each time it was cleared). Scanned again and it was not cycling. Changed the crank sensor. Now cycled a random misfire after the truck had been running about 20min, but then the computer cleared the misfire(no code thrown). Drove the truck around and about 3 hours later when I started the truck the SES came back on. Drove it around and could feel it misfiring again but only at low speeds(didnt want to push it on the highway).

I need help because this is starting to **** me off.

I did read online that when I replaced the cap rotor and cam sensor that the distributor possibly might be off a bit and could cause this.

I did get all of the repair reciepts when I bought the truck and one of them was the distributor was replaced through a recall.

Any help?

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  • Anonymous Mar 19, 2014

    poor gas milage but runs good blew disstriber cap rotor and all screwes backed out but gear worn past shaveing with peeled off too new distributor rotor cap and wires but new distributor don't come with paint mark to match intake paint mark!!!



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I just fixed my problem with all the same symptoms!!!! It took me 3 years of dealing with this problem with 4 different dealers and shops all taking their opinions on it... It should be your distributor gear. Pull the distributor and look at the cam gear, if it is worn then the cam position sensor is not getting an accurate read of where the engine is at (causing misfires, crank and no starts, etc). Also u should be able to shake the distributor up and down and hear a click sound, it's the rotor shaft moving up and down, that's because the bearings in the plastic shaft are SHOT! A new distributor from summit racing will fix your problems and only costs 150. Just be sure u know how to align the motor to TDC and u are good! As for the previous post above me, if u have a V8 the same symptoms occour when your intake is leaking. But this should fix your problem... The stock Chevy V6 distributor is JUNK and riddled with problems... Worse is that Chevy knows it and has SEVERAL TSB (Technical Service Bullitons) on its flaws...

Posted on Aug 01, 2012

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Intake gasket i had the same problem with my truck

Posted on Mar 09, 2009


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