What have you done to your square lately??

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AyWoSch Motors

The Parts Guy
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Location
New Mexico
First Name
Ayden
Truck Year
1986
Truck Model
K1500 Sierra
Engine Size
350ci V8
Picked up the newest member of the squarebody family today. 1987, custom deluxe K20 (V20), TBI 350, sm465, nice ranch bed, a free set of 8 lug rims, and a bunch of new parts in the cab. Not even the tiniest spec of rust anywhere. $800.
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Runs and drives, but the power signal to the injectors cuts out randomly, so I'll probably swap in a carburetor instead.
I also have sitting at my house, a set of nice doors, nice fenders, a nice hood, a new grill, and new rims and tires that I'm going to probably throw on there to clean it up a bit.
 

bucket

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Truck Year
'77, '78, '79, '84, '88
Truck Model
K5 thru K30
Engine Size
350-454
Picked up the newest member of the squarebody family today. 1987, custom deluxe K20 (V20), TBI 350, sm465, nice ranch bed, a free set of 8 lug rims, and a bunch of new parts in the cab. Not even the tiniest spec of rust anywhere. $800.
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Runs and drives, but the power signal to the injectors cuts out randomly, so I'll probably swap in a carburetor instead.
I also have sitting at my house, a set of nice doors, nice fenders, a nice hood, a new grill, and new rims and tires that I'm going to probably throw on there to clean it up a bit.

Might just need an ignition module. They can take out injector pulse when they are failing.
 

AyWoSch Motors

The Parts Guy
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Location
New Mexico
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Ayden
Truck Year
1986
Truck Model
K1500 Sierra
Engine Size
350ci V8
Might just need an ignition module. They can take out injector pulse when they are failing.
You mean there little module in the back of the distributor? I changed that out on this truck already.
I replaced the fuel pump, fuel filter, fuel pressure regulator, fuel pressure sensor, fuel pump relay, ignition module, and replaced the injectors with a set out of a running TBI. No luck.
Sometimes itll start up and run great for a little while, then without warning, itll just die. And I've watched the injectors when it happens. One minute they're spraying, then they stop, then the engine dies. If you bottle feed it, itll stay running.

After all that, my boss just gave up on it, so that's why I bought it. I know I can just throw a carb intake and a mechanical pump on and solve the issue. But if you have any insight to fix the TBI, please do..
 

bucket

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Engine Size
350-454
You mean there little module in the back of the distributor? I changed that out on this truck already.
I replaced the fuel pump, fuel filter, fuel pressure regulator, fuel pressure sensor, fuel pump relay, ignition module, and replaced the injectors with a set out of a running TBI. No luck.
Sometimes itll start up and run great for a little while, then without warning, itll just die. And I've watched the injectors when it happens. One minute they're spraying, then they stop, then the engine dies. If you bottle feed it, itll stay running.

After all that, my boss just gave up on it, so that's why I bought it. I know I can just throw a carb intake and a mechanical pump on and solve the issue. But if you have any insight to fix the TBI, please do..

Yep, sounds like it's troublesome, lol. Do you have another ECM to swap in for a trial?
 

gmbellew

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Kansas city
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glen
Truck Year
1990
Truck Model
suburban 1500
Engine Size
350
maybe the ECM is bad? I don't think that is very common, but sounds like you covered a lot of bases already ....

yeah, what Bucket said! too slow on the response here....
 

AyWoSch Motors

The Parts Guy
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Location
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Ayden
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1986
Truck Model
K1500 Sierra
Engine Size
350ci V8
Yep, sounds like it's troublesome, lol. Do you have another ECM to swap in for a trial?
No, sadly I dont.
Have a ECM out of an 84 Corvette for a crap-fire injectors, haha.

I figured that had to be the last option, cant think of anything else.
 

WFO

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Texas Panhandle
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Dan
Truck Year
1986
Truck Model
K20
Engine Size
350
I had to put a new Delco ignition module in my truck the other day.
Been drivin cars and trucks with HEIs for 45 years, and this was the first one to give up the ghost.
Someone before me had put in an Accel module in it.
 

CRM

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Location
Pasco, Washington
First Name
Casey
Truck Year
1985
Truck Model
K2500
Engine Size
350 CI
Got a lot of parts delivered today. Installed the new tail light assemblies, mirrors, tstat, and tstat housing. The gauge lens showed up broken and the air filter showed up crushed. Cleaned and painted the air filter housing.
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Ken B

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indiana
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ken
Truck Year
81
Truck Model
c10
Engine Size
250
I got new window motors to install. I am going to clay mitt the glass before install.
Any seasoned vet have any helpful hints on reinstall of window regulator and motor...
 

justhorns

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Location
Denver
First Name
Lee
Truck Year
81
Truck Model
C10
Engine Size
250
Original seat coming out for new foam and vinyl. 42 years of wear and one crappy cover. Anybody want the Carhardt cover?
 

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1STLS1

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Location
West Phoenix AZ
First Name
MIchael
Truck Year
1985
Truck Model
K10
Engine Size
350
You mean there little module in the back of the distributor? I changed that out on this truck already.
I replaced the fuel pump, fuel filter, fuel pressure regulator, fuel pressure sensor, fuel pump relay, ignition module, and replaced the injectors with a set out of a running TBI. No luck.
Sometimes itll start up and run great for a little while, then without warning, itll just die. And I've watched the injectors when it happens. One minute they're spraying, then they stop, then the engine dies. If you bottle feed it, itll stay running.

After all that, my boss just gave up on it, so that's why I bought it. I know I can just throw a carb intake and a mechanical pump on and solve the issue. But if you have any insight to fix the TBI, please do..
I would verify powers and grounds. I would have a test light on the tank pump to verify it's powered when it's cutting out. Then the distributor. Clean and check all the grounds are attached, to the core support and the frame along with the back of the head. Do a shake test to the harness while it's running. I have been wrong dozens of times in the past but generally if it was an ECU, it works or it doesn't.
 

CRM

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Location
Pasco, Washington
First Name
Casey
Truck Year
1985
Truck Model
K2500
Engine Size
350 CI
Morning session:

Glued down the floor liner and set the mat down. I won't make the mat permanent yet.Temporarily installed the rear speakers.

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FireTruck1984

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Location
Michigan
First Name
Ted
Truck Year
1984 and 1984
Truck Model
High Sierra K1500 350. Sierra Classic C1500 305.
Engine Size
350, 305
Original seat coming out for new foam and vinyl. 42 years of wear and one crappy cover. Anybody want the Carhardt cover?
That original material and pattern is Great ! I hope you have it Upholstered with the original design.
 

Ken B

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Location
indiana
First Name
ken
Truck Year
81
Truck Model
c10
Engine Size
250
today I reinstalled drivers door motor regulator and glass..pain in the A$$. reinstalled steering column, plugged in wiring to column, reinstalled wiper motor until,,,,the last screw , last "snug" the SOB snapped....3 steps forward and 1 back. Odd screw big head and small screw, might be tough to match/find
 

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