UPDATE!!.....
So this afternoon checked egr system out good..... after putting it back together after testing according to book, this is what I got (video).....
Leaking injectors....
But truck running better than it has in at least a year..... was idling great..... everything looked great except injectors....I don't know what I did to cause it to straighten up but it did that's all I know lol......
then.....
I decided to crack open the oil filler cap and it immediately died and can't get a restart yet....
Here's link to video
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Hello Rustjunky67,
In the video you posted in reply #21 those injectors are definitely drooling/showing
a loss of positive fuel control. It's been awhile since I've watched a TBI in person, but
I remember healthy ones looking more like this:
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(credit: screen snap from the TBI video below.)
Check out this video, starting at 0:15. NOTE: There seems to be some visual
wagon-wheel effect due to injector cycling frequency vs video frame rate. That is,
the sound is steady, and I don't think the fuel feed is pulsating when watched
in person?
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So, before we try to troubleshoot the rest of the engine any further, it makes sense
to first regain positive control of the fuel. I looked through a handful of TBI rebuild
threads & a couple of YouTube videos, and for me 'Captkaos' gave a nice blow-by-blow
& sharp photos. (LINK)
If that was my truck, I'd buy the AC/Delco rebuild kit with the following parts in it and
see if a good cleaning & some fresh o-rings might do the trick:
(Please verify that this kit is correct for your truck!)
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(source: Summit has this kit for sale for ~$42: (AC/Delco rebuild kit)
And if you haven't already done so, make sure that you have a known-good
fuel filter installed *before* going through the trouble of rebuilding your
treasure-yard sourced injectors.
****
As for the fact that your truck seems to run for a minute & then die,
another possible explanation would be that the truck will run cold (open loop)
with uncontrolled fuel (drooling) ...but as soon as it goes closed-loop the
rest of the system isn't in a state where it can compensate for that gross
of an error? (Take this with a grain of salt -- I hate to hazard a SWAG like
this in public. :0)
At any rate, I'm not guaranteeing that curing the observed TBI fuel drool will
magically fix all ills with your motor...but if you have been living clean, most
of the time if we fix the obvious, then the exotic symptoms take care of
themselves. Just remember, open loop = linear behavior = the good old
days of working on engines...while closed-loop = non-linear behavior =
how did this over here > goof up that over there?
The good news is that your TBI setup was made to be rebuilt in the field,
instead of just being swapped out and/or requiring a calibrated test stand.
Hope this helps. Happy o-ring renewing --
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