I got my '87 back on the road about a month ago with a different engine. I'm having some issues.
The engine I swapped in needed an IP so I put on a different one I had. I'm sure I didn't move the drive gear when I had the pump off.
I had the IP set about where the old one was. When I started it the first time it would chug and smoke badly (blue) and hardly run, it wouldn't even idle. I decided to mess with pump timing. I turned the pump almost as far to the drivers side as it would go, engine was running smooth and quiet then. Still a light blue haze. for a while.

Every time the truck is cold started it will chug badly (sounds like not hitting on all cyls) and smoke up the whole driveway. After about 30 seconds of feathering the throttle it will finally idle on it's own, but barely. After a few minutes it runs smooth and the smoke starts to go away. I first suspected it might have something to do with cold advance, but I unplugged it to no avail.

The truck also doesn't have the get-up-and-go it had with the old, knocking engine. I was towing a '28 gooseneck with a truck on it today, what a joke:mad:. I got it up to 55, but after a hill knocked me down to 40, it wouldnt go over 45 after that.

Any ideas? Think my timing gear is off a tooth? IP shot?

I never get black smoke, unless I have it wound almost to the governor in 3rd then it will smoke black a little.

Maybe the timing chain is stretched too much for Ip timing to compensate. If advancing ALL THE WAY helped some then that would be my guess.

did you check the compression?

Compression test?
Generally, moving the pump timing that much is too much, just a bump at a time is all it takes.
This "different" pump, did it come from your junk pile, or are you sure its good?
The only times I'VE ever had a prob with black smoke, the timing was retarded. I'm sure that's not the only cause for black smoke, but if you say it's advanced as far as it is and you're getting black smoke it leads me to believe that you jumped a gear during installation.
Try to get the "cold engine" info out of the mix for now. Get the engine to temp, diagnose, deal with cold start issues next. That's how I would start.
Dang, now you guys got me thinking about my timing chain! maybe that's the prob with my rig.

Does it run better when the cold advance is activated? Blue smoke can be improper fueling caused by a clogged fuel filter, bad injectors, or pump.

just a bump at a time is all it takes. That's what I always thought too.
The first day I had it going I turned the pump little by little to the drivers side until it would finally idle on it's own (but just barely- chug chug chug). The I adjusted while running- I turned about 3/16" to the drivers side and then it smoothed out and was idling perfectly.
I'm sure that's not the only cause for black smoke, but if you say it's advanced as far as it is and you're getting black smoke it leads me to believe that you jumped a gear during installation. All the other 6.2s I have owned would smoke black lightly if you stomped on the pedal while going down the road- this one does not. I got it to smoke when I had it wound tight accelerating with the trailer yesterday.

The pump on this engine came off another engine I never should have sold:banghead: I never did hear it run though.

My cold advance doesn't work, I could try jumping it with a wire, that would help me decide if it's time for a timing chain.

Try to get the "cold engine" info out of the mix for now.
It runs great when warmed up, but doesn't have the power (if you can associate that word with a NA 6.2) that the truck had before.
When it's cold it runs like s***.
I can take a video tomorrow morning, but I'm hauling a load of scrap before school, then going 50 miles away to pick up a flatbed I bought today (all towing a '28 goosneck:p:)

Just curios, ( for my info and the prob I'm having) what number is on your pump after the 2829?
You say "almost as far as it would go", does this mean the lines are stopping you, or are you almost bottomed out on the bolts?
Did you try going farther by loosening the lines? (PIT%$@ because you have to remove the manifold to do this) . Does it run better if you go farther to the drivers side?

BTW my rig doesn't blow any black smoke ever.

I'm almost bottomed out on the bolts, I was able to coax the lines to go that far.
I was going to change fuel filter just so it's done but I'm flat-broke now.
The truck seems to start lacking power around 30 MPH in 3rd, then it comes back just after 35 (but then it's time to shift)

I will make a cold start vid in the morning, and get it posted on here sometime. I can't really do much to the truck though, it's my only insured vehicle, I have to drive it.
Once I get something else on the road I will tear into this (the 460 Ford F250 is good to go- just needs plates but it's not cheap to drive:cool: sure is fun though)

If there is a surge in power i would definetly think air in your lines.

that is weird. im wondering if the timing chain jumped a tooth if its really screwed up.

Take a look at the advance arm and see if that moves with throttle and if the pin is stuck in. Whatever it is I'd guess timing in some way or another. Are you still driving it advanced all the way?

Are you still driving it advanced all the way?
Yes, If I turn the pump even 1/16" back to the center the engine dies instantly.

Here's how it starts and runs when cold.
http://www.youtube.com/watch?v=KB7uFrMKmqc

Jump to 2:00 to hear it idling warmed up
http://www.youtube.com/watch?v=Zg0dGPrKozM&feature=channel

It runs great warmed up but I think the old engine had more power, this one feels pretty sluggish for 4.10 gears.

vid 1- you've checked all injectors? the passenger side didn't seem to be blowing near as much smoke.

vid 2- I agree that starter is toast!!! Are you related to Corvairwild?

Sounds like it idles pretty harsh. Real clackitty

that 6.2 thats in the brown 87 was screaming"MORE HIGH IDLE REVS PLEASE!" lol. that would mask the problem a bit when its cold untill you have time to fix it. also if that brown truck run any better in the second video itd be mine! lol. why did it run so flawlessly there and like poop ever other time?

vid 1- you've checked all injectors? the passenger side didn't seem to be blowing near as much smoke.

vid 2- I agree that starter is toast!!! Are you related to Corvairwild?

Sounds like it idles pretty harsh. Real clackitty
I would like to replace injectors, but the engine is an '82 and I think it still has coarse thread heads on it. My other spare engine has coarse threads but those injectors are shot too. I can't afford to get these rebuilt or I would just to know that it's not the problem.

To me, it doesn't idle any louder than my other 6.2s have.

also if that brown truck run any better in the second video itd be mine! lol. why did it run so flawlessly there and like poop ever other time? I assume you're talking about the GMC and not the '91? It always runs that good after it warms up.

After watching the video a 2nd time I agree it idles normal