305TBI Crate Engine Swap Runs Poorly
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305TBI Crate Engine Swap Runs Poorly
I recently swapped the engine in my 1991 Chevy K1500 Scottsdale. It was a direct replacement with a remanufactured GM 305 TBI. The new motor runs, but with a few new problems that I think are linked to emissions, fuel pressure or timing. Looking for experienced opinions on what might solve the problems.
The problems that I am experiencing include
1.) a lack of power
2.) stumbling/hesitation at ~2300rpm
3.) occasional power surge when pedal is pressed, leading to a service engine code 43 (ESC malfunction/ knock sensor).
My timing is set at TDC. I have also tried to advance it 4 degrees. Still haven't done a fuel pressure check.
Here are the items which I replaced during the engine swap:
Does anybody have any thoughts on why this motor is running poorly?
The problems that I am experiencing include
1.) a lack of power
2.) stumbling/hesitation at ~2300rpm
3.) occasional power surge when pedal is pressed, leading to a service engine code 43 (ESC malfunction/ knock sensor).
My timing is set at TDC. I have also tried to advance it 4 degrees. Still haven't done a fuel pressure check.
Here are the items which I replaced during the engine swap:
- Engine (block with assembled heads),
- New block assembled
- Heads assembled
- valves adjusted according to recommendations
- Cooling
- Radiator
- thermostat
- temp sender
- Spark
- Distributor + cap
- coil pack
- new plugs and wires 10k miles ago
- Emissions
- EGR
- TPS
- MAP Sensor
- Fuel
- Fuel Filter
Does anybody have any thoughts on why this motor is running poorly?
Last edited by chinsky; Aug 4, 2021 at 6:41 PM. Reason: Didn't proof read
CF Monarch
Joined: Jul 2011
Posts: 5,920
Likes: 140
From: kevinkpk
I recently swapped the engine in my 1991 Chevy K1500 Scottsdale. It was a direct replacement with a remanufactured GM 305 TBI. The new motor runs, but with a few new problems that I think are linked to emissions, fuel pressure or timing. Looking for experienced opinions on what might solve the problems.
The problems that I am experiencing include
1.) a lack of power
2.) stumbling/hesitation at ~2300rpm
3.) occasional power surge when pedal is pressed, leading to a service engine code 43 (ESC malfunction/ knock sensor).
My timing is set at TDC. I have also tried to advance it 4 degrees. Still haven't done a fuel pressure check.
Here are the items which I replaced during the engine swap:
Does anybody have any thoughts on why this motor is running poorly?
The problems that I am experiencing include
1.) a lack of power
2.) stumbling/hesitation at ~2300rpm
3.) occasional power surge when pedal is pressed, leading to a service engine code 43 (ESC malfunction/ knock sensor).
My timing is set at TDC. I have also tried to advance it 4 degrees. Still haven't done a fuel pressure check.
Here are the items which I replaced during the engine swap:
- Engine (block with assembled heads),
- New block assembled
- Heads assembled
- valves adjusted according to recommendations
- Cooling
- Radiator
- thermostat
- temp sender
- Spark
- Distributor + cap
- coil pack
- new plugs and wires 10k miles ago
- Emissions
- EGR
- TPS
- MAP Sensor
- Fuel
- Fuel Filter
Does anybody have any thoughts on why this motor is running poorly?
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