The Patient: 1992 FJ80 3-FE 302K
I started a new thread since the previous one I have been working on is so much different than the new symptoms. A brief history, after a failed distributor situation, I had the head gasket replaced and completed an engine "refresh". Engine has not been running well since.
This situation is a little unusual and I did not find any other threads which related to this. The first drive of the day, when the engine starts cold, the truck runs perfect. Tons of power (for a 3-FE), and continues to run great for the duration of the trip, even after the engine is warm.
Once I turn the engine off and let it sit for a couple of minutes, if I turn it back on again it runs like a complete dog. The next day, or several hours later after it has cooled, this starts all over again.
This afternoon I started it up and drove to the store (drove great), left the store (drove like crap), then went to the car wash to power wash the engine grease off. After I washed the engine, which cooled off probably all the sensors and stuff on the outside of the engine, it ran great on the way home. Let it sit for 3 mins, restarted...ran like crap.
Confirmed no vacuum leaks. Unlike a bad temp sensor, which from reading other threads, would likely start to run like crap as soon as the engine became warm, this is fine until it is turned off. To me this acts like a bad relay, which when cold works and stays closed, but hot cannot function. Can anyone think of anything that would behave this way?
EFI Relay is brand new.
I started a new thread since the previous one I have been working on is so much different than the new symptoms. A brief history, after a failed distributor situation, I had the head gasket replaced and completed an engine "refresh". Engine has not been running well since.
This situation is a little unusual and I did not find any other threads which related to this. The first drive of the day, when the engine starts cold, the truck runs perfect. Tons of power (for a 3-FE), and continues to run great for the duration of the trip, even after the engine is warm.
Once I turn the engine off and let it sit for a couple of minutes, if I turn it back on again it runs like a complete dog. The next day, or several hours later after it has cooled, this starts all over again.
This afternoon I started it up and drove to the store (drove great), left the store (drove like crap), then went to the car wash to power wash the engine grease off. After I washed the engine, which cooled off probably all the sensors and stuff on the outside of the engine, it ran great on the way home. Let it sit for 3 mins, restarted...ran like crap.
Confirmed no vacuum leaks. Unlike a bad temp sensor, which from reading other threads, would likely start to run like crap as soon as the engine became warm, this is fine until it is turned off. To me this acts like a bad relay, which when cold works and stays closed, but hot cannot function. Can anyone think of anything that would behave this way?
EFI Relay is brand new.
