Trucks running werid

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1984 Chevy k20

1984 Chevy k20

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Wyatt
Truck Year
1984
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K20
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5.7L
So I built this truck when I was 14 with my dad, it has ran great with a couple of hiccups here and there with random stuff, well lately it has started to form this nasty clattering and has been more sluggish then normal, and the part that’s making this hard to pinpoint is it has good oil pressure, and runs good, other then around 3000 rpm tends to start like shaking the truck but above and below that point is find and tends to get worse or better depending on temp of engine

I’m just not sure what’s going on and why it’s being a pain
 
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Ricko1966

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fast 99 said:
did 84's have a knock sensor?
Click to expand...
If it's a 305 yes IDK about 350 or a 350 swapped in on 305 engine management. They upped the compression on the 305s early 80s and went knock sensor. Unsure what year but by 83 I'm pretty sure. LE9 came out in 81 so I'm thinking 81 would have been first year for knock sensor.
 
1984 Chevy k20

1984 Chevy k20

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It’s all old school carb, hei, and mechanical fuel pump stuff so no factory tbi anything
 
fast 99

fast 99

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Ricko1966 said:
If it's a 305 IDK about 350 or a 350 swapped in on 305 engine management. They upped the compression on the 305s early 80s and went knock sensor. Unsure what year but by 83 I'm pretty sure.
Click to expand...
Interesting, remember 305's having more in the way of emissions. Knock sensor never occurred to me.
 
1984 Chevy k20

1984 Chevy k20

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Utah
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Wyatt
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1984
Truck Model
K20
Engine Size
5.7L
Ricko1966 said:
If it's a 305 yes IDK about 350 or a 350 swapped in on 305 engine management. They upped the compression on the 305s early 80s and went knock sensor. Unsure what year but by 83 I'm pretty sure. LE9 came out in 81 so I'm thinking 81 would have been first year for knock sensor.
Click to expand...
Hmmm I didn’t know they had knock sensors in 84, this k20 was the “ camper base “ package so not quite all the gizmos of a camper special but came with a heavier duty frame, a different code 350 and other little things, so I think with it being in a heavier gvw, probably is the reason it didn’t really get any emissions to it, but I could be wrong cause I bought the truck already stripped of all emissions
 
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Ricko1966

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Okay I get tripped up by not asking year,make,model and engine again. Still could be knock sensor though. Look at the distributor does it have a 4 wire plug going from the distributor, through the firewall to a control unit behind the glove box.
 
1984 Chevy k20

1984 Chevy k20

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Location
Utah
First Name
Wyatt
Truck Year
1984
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K20
Engine Size
5.7L
Ricko1966 said:
Okay I get tripped up by not asking year,make,model and engine again.
Click to expand...
Sorry that was my bad for not providing the info

It’s a 1984 Chevy k20 with an “M” code 350 that has since been rebuilt to be a 10:1 compression aluminum headed, flat topped piston small block, still running flat tappet cam and running a 650 cfm avs 2 edelbrock, and if it is relavent at all, it has a 3500 stall ( I know way to big, I was young ) with a slightly built th400
 
1984 Chevy k20

1984 Chevy k20

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1984
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K20
Engine Size
5.7L
1984 Chevy k20 said:
Sorry that was my bad for not providing the info

It’s a 1984 Chevy k20 with an “M” code 350 that has since been rebuilt to be a 10:1 compression aluminum headed, flat topped piston small block, still running flat tappet cam and running a 650 cfm avs 2 edelbrock, and if it is relavent at all, it has a 3500 stall ( I know way to big, I was young ) with a slightly built th400
Click to expand...
4 bolt main
 
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Ricko1966

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Well rockauto seems to think they had them.
 

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1984 Chevy k20

1984 Chevy k20

Junior Member
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Sep 3, 2024
Posts
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Location
Utah
First Name
Wyatt
Truck Year
1984
Truck Model
K20
Engine Size
5.7L
Ricko1966 said:
Well rockauto seems to think they had them.
Click to expand...
Huh, that’s really werid, cause that motor didn’t even come with a knock sensor, let alone any wiring, harness, or anything for that type of thing
 
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Ricko1966

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1984 Chevy k20 said:
Sorry that was my bad for not providing the info

It’s a 1984 Chevy k20 with an “M” code 350 that has since been rebuilt to be a 10:1 compression aluminum headed, flat topped piston small block, still running flat tappet cam and running a 650 cfm avs 2 edelbrock, and if it is relavent at all, it has a 3500 stall ( I know way to big, I was young ) with a slightly built th400
Click to expand...
M code was low compression 350 HD emissions,so very doubtfully it would have knocknsensor
 
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Ricko1966

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c20
Engine Size
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1984 Chevy k20 said:
Huh, that’s really werid, cause that motor didn’t even come with a knock sensor, let alone any wiring, harness, or anything for that type of thing
Click to expand...
Yea didn't have all the info when I started typing.
 
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