Ok, my new to me 2000 blazer has a p0300 code. After searching this topic for awhile i came up with a hypothisis. I decided to start with the distributor drive gear. The first thing i did was remove the cap and give it a little wiggle. I was strangly happy with the results. It would rotate a little back and forth. It would also move up and down about 3/16". Do to the fact that its a helical gear, as it moved up it also rotated even more. In all almost 10°! So i orderd a new delco distributor drive gear from www.autopartstomarrow.com. My new favorite parts store. Free next day air delivery for orders over $50!! gear was only 20 somthing so i grabed a few other things too. So i get the gear replaced and and had to fight a little to get my marks lined back up right. The oil pump shaft down in the hole had to be rotated a bit. Thats not easy in a blind hole. I used CLEAN flat file. I thought it was better than a screwdriver.


IT'S FIXED!!!!

No more hesitations, jerking, sputtering, misses, loss of power, or anything you wanna call it.

Oh and the rotor didn't have all the movment that it had prior to the fix.

 

Very good finally someone did there homework and got successful results

 

I read in a post somewhere that after the distributor is changed or gear in this case, that you gotta plug in a scan tool to recalibrate some things before its RIGHT. My idle is a little rough. Could that be why?

 

yea bring it to a shop and let them do that i do hope you replaced your old parts with ac delco. these trucks are picky for those kind of parts . all other market parts make the truck run a little rough too

 

Yeah it was a delco gear. The cap, wires, & plugs were replaced just before i got it from a buddy. He didn't use delco for them.

Does anyone have any experience with the cheap scan tools from harbor freight? Im tempted to get one

 

congrats!! Hopefully after a few miles the problem won't come back. But if it does then you're only firing off 5 cylinders instead of all 6.