Oh brother.. I'm still waiting for the misfire to come back. Haven't changed the old wires out yet.

 

Wow I'm so sorry to see that you are still having problems. I think you are on the right track. When my MAF was failing it would run fine for a few minutes when cold then start all of the hijinks you describe. New MAF was an instant cure.

 

And I did get the Amazon MAF for 33 bucks or whatever. It works for me.

 

Well I have it narrowed down, but not fixed yet.

Still rocking P0300 and P0307.

New MAF is in, and misfires only when not under load. Took it to a friendly shop down the street, we plugged a Matco into it, and have narrowed it down to a fuel injector.

The only other thing it might be is a smoked CAT. No rattles though....

Idling, it misfires. cruising, it misfires, under acceleration, no problems.

????

MAF is the amazon one, $35 ish, and works fine. For the cost, I'm not complaining.

The #7 plug was dry fouled pretty bad, so it's getting some fuel, just not at the right time.

Valves seem to be OK, no issue there. Sound fine.

So, my debate is to take it in for a heavy duty fuel system cleaning, or pull injectors and rebuild.

I'm thinking a $50 deep clean would be worth a shot before I tear off the IM, kill my knuckles and my weekend.

That, or just use about 8 bottles of seafoam through it, but hell, that's the same cost anyway..

Any more thoughts guys/gals? I'm working on stumped here.

 

If you know it's the injector why mess around? In your shoes I would gather the funds.. and replace it. That money you spend on seafoam may not fix the problem. Replacing the injector will. I'm just not a fan of doing things twice is all.

 

I replaced my injectors... Fortunately I had my original, clean, dealer maintained engine to swap from. Atl, I had a lot of practice but you can get the upper IM off in 20 minutes. The fuel rail is a little hard to get off but after that you in green pasture. I'd go straight to the source and replace the offending injectors. A tip, have a piece of cardboard handy to put over the passenger exhaust area. You can leave the throttle cables and vacation tunes attached and just pivot the IM to the cardboard.

My phone is retarded. English is my first and only language. Please translate... Too hard to correct on phone screen.

 

Thanks guys.

Did a double dose of seafoam on about a quarter tank last night.

Ran a little better.....but....climbed under the truck at idle and think it spat a steel marble into my cat on the driver side. Guess that was only a matter of time.

So today is welding practice day. fortunately, welding pipe is something I've been practicing a lot, so after the y-pipe comes off, it'll be easy.

Thank goodness universals are cheap. I thought about deleting them, but in the end, not worth it.

I'm seeing this prize fight through to the 10th round, bloody or not. I refuse to be defeated by a 1960's buick block masquerading around in a stylized pseudo-military vehicle wearing a prom dress. Refuse.

Nothing like spending half a saturday in a leather getup and a mask.....

 

When you figure out which cats will you shoot me a link? I have flex pipe where my cats were and it sounds pretty awful. I bought a couple and they were the wrong diameter fittings so I resold them (at a profit) and just sort of petered out.

 

Good luck! I will be doing this soon as well. Please let us know what universal cats you end up with. I'm going to tack and then take to the muffler shop for a proper (I hope) job.

 

Further Update:


^-welded these in^ Old one's weren't all that bad, but probably not helping either.

Had coil pack tested by a friendly shop. #7 terminal is non-functioning. Great.

Got new coil pack from O'reilly auto, and will tear down IM/etc to get it swapped out.

If this doesn't fix it, I'm going out in the desert with some beer, high explosives, and a video camera, and this SOB is getting a Viking Funeral with a side of dynamite. I'll post it on youtube and giggle enough to warrant the purchase price. I mean, what's $3K....right?