kornshadow097
Newbie
- Joined
- May 4, 2022
- Messages
- 5
- Points
- 1
- Make
- Toyota
- Model
- Highlander hybrid limited
- Year
- 2008
- Miles
- 300000
- Engine
- 3.3l
So after battling for several months. My 08 hihy is still misfiring when cold. On cyl 2 and 4. It did on cyl 6 as well before the headgasket was changed by an unreliable mechanic before I moved out of state.
I tested compression. All passed. I changed injectors on all 3 cyl, changed spark plugs, changed coils, replaced the bank 2 AFR sensor and even swapped components around with no changes.
I changed the oil and cleaned the maf sensor.
Fixed vacuum leaks and my mpg went up.
It all started when I had a blown headgasket and burned water, it would shake at start up n misifire mostly only when cold. Some mechanic replaced the gasket and I got a valve job and the heads checked and they passed. it worked fine for a few days then started misfiring on the same cylinders.
Runs smooth with minor misfires when hot, but cold especially at start up it adds up several and the check engine turns on after I turn off the engine and restart it later.
I bought a fpr and partsgeek was wrong about it being on the fuel rail... Cuz a diagram a friend showed me showed my exact part is by the pump in the tank..
N Id think if it was the fpr it would make several random cyl misifire not just the same 2 everytime..
Only possible culprits I can think of are:
FPR
ECM
wiring harness somewhere (fuel or ign)
CPS (crank and/or Cam position sensors)
Bank 2 sensor 2 AFR sensor
I'm out of ideas and am running out of money to toss at this problem.... I'd like educated guesses...
I tested compression. All passed. I changed injectors on all 3 cyl, changed spark plugs, changed coils, replaced the bank 2 AFR sensor and even swapped components around with no changes.
I changed the oil and cleaned the maf sensor.
Fixed vacuum leaks and my mpg went up.
It all started when I had a blown headgasket and burned water, it would shake at start up n misifire mostly only when cold. Some mechanic replaced the gasket and I got a valve job and the heads checked and they passed. it worked fine for a few days then started misfiring on the same cylinders.
Runs smooth with minor misfires when hot, but cold especially at start up it adds up several and the check engine turns on after I turn off the engine and restart it later.
I bought a fpr and partsgeek was wrong about it being on the fuel rail... Cuz a diagram a friend showed me showed my exact part is by the pump in the tank..
N Id think if it was the fpr it would make several random cyl misifire not just the same 2 everytime..
Only possible culprits I can think of are:
FPR
ECM
wiring harness somewhere (fuel or ign)
CPS (crank and/or Cam position sensors)
Bank 2 sensor 2 AFR sensor
I'm out of ideas and am running out of money to toss at this problem.... I'd like educated guesses...