Tahoe Timing? or something completely different?

[jrsavoie]

On the 95 Tahoe 244,000 miles, I do not think it was ever timed after installing the chain and gears. It has a fluidamper & 97 air box.

It has been down on MPG's for a while. Quite a while. I noticed after the chain and gears were installed.
There was quite a span in time between when I drove it before the timing chain and gears and started driving it immediately after the change when I noticed there was a problem. So I do not know how it was running or what milage it was getting before the change.
Some people don't notice things like that. Or even when the brake pad is worn completely gone and they are using the caliper - they say it never made a sound - or maybe they had the radio up to cover that obnoxious noise.

It also had rebuilt injectors at the same time as the chain and gears -

It blows a lot of black smoke when you punch it.
And seems to be slightly down on power.
Other than that it seems to run fine.4

Are there other things other than timing I should check?
Something next if it is not the timing?

I did the paper clip between A and B and got no codes.

Thanks

http://www.thetruckstop.us/forum/showthread.php?t=22232&highlight=timing+OBD1

 

[ak diesel driver]

It certainly can't hurt to time it. Also sounds like you boost system isn't working correctly.

 

[WarWagon]

It certainly can't hurt to time it. Also sounds like you boost system isn't working correctly.

X2.
Do you have a boost gauge installed? This is the most cake gauge to put in.
Or just start with lack of boost troubleshooting then move on to timing. Still need a gauge for that...

 

[buddy]

Id start with getting GMTDScanTech! Its the best tool ever and in abscense of gauges tell you everything pertinent, other than EGTs.

But timing it correctly is a good start. recent loss of power though and black smoke sound like boost issue though, like a cracked vacuum line, easy fix. Just need to do some vacuum diagnostics, also easy.

 

[jrsavoie]

Didn't get to doing much today other than found out I need upper and lower ball joints on the right side.

Scanned it and had no codes

I did have history codes
#33 input mapp
#78 turbo wastegate solenoid
Don't know if that tells me anything before I start.

 

[buddy]

33 is an EGR code, low vacuum. So you have/had a vac leak sometime, and that would cause turbo not to work right and the DTC78