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1997 K3500 454 Work Horse

Will L.

Well-Known Member
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Location
Boulder City Nv
Yeah, i need to go back and reread it. Something is WAY off.

That weak, and a new-to-you truck, i would start with a compression test. Then hook up
A vacuum gauge to the manifold and do that check- do you know what to watch for?
If those two aren’t right- the fueling cant be right no matter what system.
 

tanman_2006

Just a farm kid...
Messages
5,635
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722
Location
Seiling, Oklahoma
I would exhaust everything first, then if nothing was found move to the motor..

Does this truck have a ecm? Any tunes in it? electronic injected or carb?

I read through some of the thread but not all of it...
Its a 97 vortec 454 w/ 4l80. Cleaned throttle, cleaned maf w/ maf cleaner, new iac, new ect sensor, new downstream O2 sensor. All stock as far as I know. Rebuilt engine and reman trans both with 5k on them.

To hold 55mph loaded it down shifts to 2nd alot.

Starts fairly hard cold, almost wont start after a heat soak, and idles rough
 

tanman_2006

Just a farm kid...
Messages
5,635
Likes
722
Location
Seiling, Oklahoma
Yeah, i need to go back and reread it. Something is WAY off.

That weak, and a new-to-you truck, i would start with a compression test. Then hook up
A vacuum gauge to the manifold and do that check- do you know what to watch for?
If those two aren’t right- the fueling cant be right no matter what system.
If I end up pulling spark plugs I'll check compression. What numbers should I see?

Seems to pull alot of vacuum. Used maybe 1/4 qt in 3k miles.
 

tanman_2006

Just a farm kid...
Messages
5,635
Likes
722
Location
Seiling, Oklahoma
Well I'm not really a gas person but would be curious as to what cam it has.

Is their a TV type of cable controlling the tranny? I also only do manual trannys and don't know much about autos LOL...

Any codes?

I'm more of a carb person..

Me thinks Ferm would be the one to know better..
No codes. Its all electric on the 4l80 and it shifts nice.

I assume stock cam, it was driven by an older man (60-70ish) as his work truck building houses and is a one owner truck.

The cam could be wrong but how could you get one this weak? Lol the stall would also be interesting to know too.
 

Will L.

Well-Known Member
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8,672
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8,472
Location
Boulder City Nv
On vacuum it isn’t just over all vacuum, it is reading fluctuations. I have a cheat sheet I keep With my vacuum tester, When I go back out to shop I will post a pic for ya.

To find the tc stall speed: start engine, hold brake pedal full, then throttle as hard as possible without over powering brakes, full throttle if capable. Read tachometer- that rpm is the stall speed. This doesn’t hurt anything, but does heat up the trans fluid really quickly, so never more than 30 seconds.
 

tanman_2006

Just a farm kid...
Messages
5,635
Likes
722
Location
Seiling, Oklahoma
It's only a little over a yr old reman and mayne 7k miles tops. The receipt only says reman engine written on it. I got the shop number from the PO and told him the situation, I am trying to see if he will help me with the shop and at least get me a break on repairs (don't really want to take it back for the same crap). I am hoping it is a jasper engine which is a 3yr 100k transferable warranty (and I don't like Jasper either).

Last hope is to atleast he can shed aome light on what was done so I can tell my shop.

How far can you bore out a 454 block? Lol
 
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