I was able to remove the hold down bracket with a long screwdriver and just carefully pry it off the dizzy while still installed in the motor. I just ovalled out the bolt hole a bit and was able to get plenty of adjustment out of it that way.

 

Another valid strategy. Just goes to prove there is often more than one way to accomplish the same thing. In fact I like elongating the bolt hole in the bracket better! Wish I would have done it on mine that way.

 

I'll give that a shot. Is the hold down shaped like a two pronged fork? If rex was able to remove it while in place with a screwdriver, it must be. then I guess I can elongate the hole. Makes sense to me, I shouldn't need much adjustment anyways.

 

Yup that's what you want to remove and modify!

 

It's funny, my ses came on this morning after the jerking and oddly high rpms ( 2200@ 70 mph, 1850@ 60) But, my handy dandy blue tooth adapter is in my garage, where I was showing it off to some people last night. probably a p0300, but why come on and go off? Also, as I got closer to work, the truck settled down and rpms seemed to be back to normal with the ses on?

 

Have you seen this one for how the SES light reacts to P030x?
https://blazerforum.com/forum/diagno...4-5-6-a-35153/

I tend to leave my bluetooth plugged in all the time (doesn't run the battery down even when sitting a week). That way I can whip out my phone and check stuff at whim. Even gas mileage with Torque Pro. Let us know what you are experiencing (per the scanner) and we will go on. Did you get the cam retard set yet?

RPMs were probably the difference between TCC enabled and TCC disabled, after the PCM recognized a malfunction.

Here is a good article that illustrates what one can be up against with a misfire code, and the reason why one needs to systematically validate the fuel and ignition systems on a Blazer before getting into the oddball stuff during a P030x. Blazers have a single coil crank triggered ignition system as well as known fuel system issues - these are both known trouble areas.

http://www.underhoodservice.com/diag...-as-a-symptom/

 

Sorry for the delay guys, been dealing with life. Haven't done anything to the blazer yet. I did scan it on the way to work, fuel trims (st) stayed around -1.5 to + 5% @ 2000 rpms 70 mph. they'd go up when I slow down to town speed, but the thing I'm seeing the most is the number 4 cylinder seems to suffer the most misfires, especially when it's not up to temp. I should be able to check it all out this weekend and post some more useful data. Btw, thanks Les, those links you sent are exactly the kind of information I like to see and study on.

 

You are welcome. Let us know when you are ready.

 

lesmyer I just got the hand-dandy bluetooth adapter and the car gauge pro, how do I tell the cam retard on it?

 

Hey, guys, a small update. I got the time to check a few things out. The fuel pressure tests, as per the Captain, all specs were good. I have misplaced the paper that I wrote everything down on, of course or I would post the numbers. I went back to re-verify the distributor and did indeed find slop in the rotor. so, I'll order a new gear and carry on. Maybe that'll fix it. At any rate, I don't see the point of further diagnoses until I can rectify the distributor slop. Any additional advise would be welcome. Thanks so much!