1993 Chevrolet K1500 - 5.7
it recently has developed a constant issue where it only runs with the set timing connector disconnected (while I set it to 0 degrees of timing as indicated by the manufacturer)
It all started when I went to do some maintenance on the truck
I replaced the spark plugs and spark plug wires and also replaced the old exhaust manifold gaskets with a new copper set
went to go turn it on and at first it wouldn't even fire up (mind you i never loosened the distributor so i didn't rotate it)
found that it was way advanced so I disconnected the set timing connector and set timing to 0 degrees and it ran great
turned it off, plugged the connector back, turned it on, ran like hairy nuts again
went to go check the timing with the connector connected and it was wayyyyy advanced again
I'm talking like 20 degrees advanced so the truck spit and sputtered then eventually died
Here's a list of parts I have replaced so far
Distributor shaft (tried 2 of these)
Ignition Module (tried 2 of these)
Ignition Rotor (tried 3 of these)
Ignition Cap (tried 3 of these as well)
Ignition Coil
MAP Sensor
EGR Valve
IAC Valve
Rechecked the gap on plugs and made sure they were the right ones
Coolant temp sensor (Both of them)
Fuel Filter
And New Oxygen Sensor
It also has a refurbished engine from power torque with less than 5k miles on it
After all of this, the problem still persists and I have not noticed any improvement with any of the parts I have changed (timing still advances to 20+ degrees with set timing plugged in after all the changes)
it recently has developed a constant issue where it only runs with the set timing connector disconnected (while I set it to 0 degrees of timing as indicated by the manufacturer)
It all started when I went to do some maintenance on the truck
I replaced the spark plugs and spark plug wires and also replaced the old exhaust manifold gaskets with a new copper set
went to go turn it on and at first it wouldn't even fire up (mind you i never loosened the distributor so i didn't rotate it)
found that it was way advanced so I disconnected the set timing connector and set timing to 0 degrees and it ran great
turned it off, plugged the connector back, turned it on, ran like hairy nuts again
went to go check the timing with the connector connected and it was wayyyyy advanced again
I'm talking like 20 degrees advanced so the truck spit and sputtered then eventually died
Here's a list of parts I have replaced so far
Distributor shaft (tried 2 of these)
Ignition Module (tried 2 of these)
Ignition Rotor (tried 3 of these)
Ignition Cap (tried 3 of these as well)
Ignition Coil
MAP Sensor
EGR Valve
IAC Valve
Rechecked the gap on plugs and made sure they were the right ones
Coolant temp sensor (Both of them)
Fuel Filter
And New Oxygen Sensor
It also has a refurbished engine from power torque with less than 5k miles on it
After all of this, the problem still persists and I have not noticed any improvement with any of the parts I have changed (timing still advances to 20+ degrees with set timing plugged in after all the changes)