72/68 blazer 4x4 dream/nightmare

[mud.man.rj]

I love to find hard problems like your, a good challenge, to bad I wasn't closer, just to far away up here in the North.

[Madtrucker]

With everything going on right now I wish you were closer to, I'd love some help right now. I'm getting ready to move and packed most of the tools already, so that's not making it any easier. I'm hoping it's mostly a timing issue, it's set by ear right now.

[Madtrucker]

So I feel like I'm a small step closer. I dug the timing light out and realized the distributor hold down was a little loose. I reset the timing and the carb, but I'm not sure of what the total advance is at. I also put 10 gallons of fresh 93 in, probably had 8 gallons of 87 already in it. Anyway now the 35's bark loud off the line, chirp in 2nd then it loses all power like it's going through a mud pit. Rolling at 35mph hit the gas and it barely gets out of its own way. Not sure where to go from here, not a lot of time and money with the move coming. I'd really like to put it away for the season ready to go next year.

[Madtrucker]

Figure I'll post again in hope of some good advice. Finally somewhat settled in the new house, I started trouble shooting the power issue again. I started by running a new 12g wire to a new summit hei distributor. I also added a new summit 600 carb, fuel pump, and regulator. Drained the tank and started with fresh gas. New plugs, wires and pcv valve. Checked for vacuum leaks, and double checked tdc. All this and still hasn't solved the problem. In fact it worse now because now pop back through the carb while hard accelerating and run on when I shut it down. I'm so frustrated I listed it for sale last night.
I plan to check the compression after a little more carb tuning fails. Any insight would be greatly appreciated, I have little time to work on it and would love to start enjoying it.

[mcmlxix]

Originally Posted by Madtrucker

... I'm so frustrated I listed it for sale last night.
I plan to check the compression after a little more carb tuning fails. Any insight would be greatly appreciated, I have little time to work on it and would love to start enjoying it.

Before selling it, see if you can find a local shop to look at it for you. It may be something that you just don't see. Set a dollar amount to diagnose. Maybe Someone here can help or help to recommend a shop near you. Throw out a Zip-code to narrow it down.

[ClassicStyle]

What are you asking for it? You can pm me if you want my dad might be interested in a blazer.

I'll think about your problem too, it's kind of a wierd one

[Madtrucker]

That has crossed my mind, my buddies and I always work on our own stuff and have never had the need for a shop. There's so many possibilities the shop hours would rack up fast. But if anyone knows of a reputable shop near 48185 I'm open minded at this point.

[Madtrucker]

I pulled the carb spacer off, that must have sealed a minor vacuum leak. It idles much better and a little more responsive, baby steps. It's also nice having a taller garage and being able to walk under the hard top now.

[lks dcvn]

Agree with a shop visit - sometimes the money spent is worth it to to have the problem diagnosed and then you can fix it.

Also - having the issue fixed would potentially net you more money in a sale.

[Madtrucker]

So I was offered full asking price the other day and decided to keep it. I told the guy he'd get the first call if I changed my mind again. Anyway after solving the vacuum issue I played with the initial timing a bit last night. I found that 12* made a little more improvement. Better response, more power while cruising and the run on wasn't constant. I still need to set the total timing as soon as a get a good dial back timing light and a helping foot. After 2 harbor freight lights I guess I'll stop being cheap. I've never messed with curving a distributor, I'm sure it'll be a few long aggravating trial and error days. I'm really eager to get it looking right after making it act right.

[Chulisohombre]

It's hard to get rid of something you've worked so much on. With a clocked rv cam and high lift rockers mine likes to sit around 12-15 btdc as well to get full power. I don't use the timing tab anymore though. I timed mine with a vacuum guage and timed it for best overall vacuum at 3000 rpm. Made a world of difference in power.

[Madtrucker]

I kind of suspected the tv setting for the Trans as a big portion of the problem, even though I set it as directed. I had a Trans shop reset it with the pressure gauge hooked up, they even had a hard time he said. It made a huge difference, firmer shifts, better response. It still falls off a bit after 3rd but no rediculous. Testing passing gear I found a new problem, I got in it in 3rd downshift was fine up shift seemed pretty hard then the truck started bouncing. It was like driving over a washboard at 40mph, almost like there were no shocks in the front. I'm really hoping it's not a torque converter issue, I'd think that would be more of a jitter. I stopped to inspect it and didn't see anything, it hasn't done it again but I haven't gotten into it either since.

[jondancer]

Looking for 2wd thanks

[jondancer]

madtrucker pm sent