Okayyy, this is driving me crazy. 97 FZJ80
One peaceful afternoon I started the truck, the motor is shaking and I was like that is a misfire, so I drove it in the neighborhood until the check engine light comes up.
Turns out it is p0304, number 4 cylinder misfire.
The symptoms when I drive it was interesting, I rev it up couple times, then the misfire go away, when it rest back to idle speed then I try to speed up like 2-3k rpm, the misfire comes back. Basically, the misfire happens under load or when the truck is moving.
So far the spark plug is good, plug is good, I thought it was the injector so I change all of them to Bosch 4 hole injector, still no luck, idle good, when I started driving, the misfire comes back.
Same symptom happens.
I have an another ECU just laying around I got from a parts car, plug in, no luck.
I check the wiring harness behind the glove box all look good.
I peel open the wiring harness at the egr which I deleted about a 2 years ago, all look good.
What is wrong with this truck?
One peaceful afternoon I started the truck, the motor is shaking and I was like that is a misfire, so I drove it in the neighborhood until the check engine light comes up.
Turns out it is p0304, number 4 cylinder misfire.
The symptoms when I drive it was interesting, I rev it up couple times, then the misfire go away, when it rest back to idle speed then I try to speed up like 2-3k rpm, the misfire comes back. Basically, the misfire happens under load or when the truck is moving.
So far the spark plug is good, plug is good, I thought it was the injector so I change all of them to Bosch 4 hole injector, still no luck, idle good, when I started driving, the misfire comes back.
Same symptom happens.
I have an another ECU just laying around I got from a parts car, plug in, no luck.
I check the wiring harness behind the glove box all look good.
I peel open the wiring harness at the egr which I deleted about a 2 years ago, all look good.
What is wrong with this truck?