Vapor lock
redashi
Jeeper
Greetings,
Recently started having vapor lock issues. A little background. The cj was running rough, rebuilt the stock carb and lost spark while tuning it, alternator was putting out 16+ volts and fried the computer. Did a nutter bypass and upgraded to weber carb since I couldn't get the carter to run good at idle with the stepper motors and replaced ignition components, ICM, coil, etc. Ran good for a couple months, then started idling bad again, then occasional stalls at a light. Noticed the exhaust manifold gasket near the carb was bad blowing exhaust right on it, thought that was the issue, didn't fix the vapor lock. Heard the aftermarket ICM are , changed again with no love.
Now the problem is worse. I can idle in the driveway all day with no issues, but when it is under load and the thermostat kicks in, it vapor locks but intermittently. Drive in the morning, good. Afternoon or evening, it dies but randomly. I live in Washington state, not real warm right now. Tonight it backfired flames after it died from vapor lock. Timing is at 8 btdc, carb idle is halfway between where it runs rough. Replaced and rerouted fuel lines away from heat sources, plus insulated the lines. I'm at a loss. Vacuum or electrical maybe? Hopefully someone smarter than me can point me somewhere.
Recently started having vapor lock issues. A little background. The cj was running rough, rebuilt the stock carb and lost spark while tuning it, alternator was putting out 16+ volts and fried the computer. Did a nutter bypass and upgraded to weber carb since I couldn't get the carter to run good at idle with the stepper motors and replaced ignition components, ICM, coil, etc. Ran good for a couple months, then started idling bad again, then occasional stalls at a light. Noticed the exhaust manifold gasket near the carb was bad blowing exhaust right on it, thought that was the issue, didn't fix the vapor lock. Heard the aftermarket ICM are , changed again with no love.
Now the problem is worse. I can idle in the driveway all day with no issues, but when it is under load and the thermostat kicks in, it vapor locks but intermittently. Drive in the morning, good. Afternoon or evening, it dies but randomly. I live in Washington state, not real warm right now. Tonight it backfired flames after it died from vapor lock. Timing is at 8 btdc, carb idle is halfway between where it runs rough. Replaced and rerouted fuel lines away from heat sources, plus insulated the lines. I'm at a loss. Vacuum or electrical maybe? Hopefully someone smarter than me can point me somewhere.