Misfire help
02-09-23, 03:27 PM
#16
Driver School Candidate
Thread Starter
Any leaks in the air supply between the MAF sensor to the throttle body could cause this. Has your intake manifold ever been removed? Perhaps one of the manifold-to-head seals is leaking after the heads heat up.
When cold, the richer fuel air mixture could be masking a possible vacuum leak. Then, when the engine heats up, the leak could cause a "too lean" condition.
Just spit-balling here. Good luck!
When cold, the richer fuel air mixture could be masking a possible vacuum leak. Then, when the engine heats up, the leak could cause a "too lean" condition.
Just spit-balling here. Good luck!
See that crack in the box, couldn’t detect any leaks there but thoughts?
02-09-23, 03:35 PM
#17
Pole Position
Do you drive on dirt roads a lot? The air box looks filthy!
02-09-23, 11:35 PM
#18
Driver School Candidate
Thread Starter
just found this also, I replaced valve cover gasket a couple weeks ago and didn’t see any pieces in there
02-10-23, 01:45 PM
#19
Pole Position
02-11-23, 10:21 AM
#21
Pole Position
I would replace the cap...just due to my perfectionism.
One more idea on your misfire. Make sure your cooling system is bled properly, with no trapped air in the head.
One more idea on your misfire. Make sure your cooling system is bled properly, with no trapped air in the head.
02-19-23, 11:50 AM
#24
Pole Position
I'd be curious to know if others have had the same trouble as I did when changing the filter. One wants to believe an air filter change is a piece of cake...undo the three snap clamps, lift the lid, remove old filter and insert new, and re-clamp, as with most vehicles. However, the air filter box does not allow one to do this. Each time after struggling with it, I've had to completely remove the top of the box, which entails removing the large hose between the box and the throttle body. Only then can I get the box properly seated with the new element. It seems like a design error to me. On the other hand, it gave me a chance to clean the throttle body.
02-19-23, 12:14 PM
#25
Driver School Candidate
Thread Starter
thanks, good to know the gap is normal
I replaced my ES350 engine air filter yesterday. This gap is normal.
I'd be curious to know if others have had the same trouble as I did when changing the filter. One wants to believe an air filter change is a piece of cake...undo the three snap clamps, lift the lid, remove old filter and insert new, and re-clamp, as with most vehicles. However, the air filter box does not allow one to do this. Each time after struggling with it, I've had to completely remove the top of the box, which entails removing the large hose between the box and the throttle body. Only then can I get the box properly seated with the new element. It seems like a design error to me. On the other hand, it gave me a chance to clean the throttle body.
I'd be curious to know if others have had the same trouble as I did when changing the filter. One wants to believe an air filter change is a piece of cake...undo the three snap clamps, lift the lid, remove old filter and insert new, and re-clamp, as with most vehicles. However, the air filter box does not allow one to do this. Each time after struggling with it, I've had to completely remove the top of the box, which entails removing the large hose between the box and the throttle body. Only then can I get the box properly seated with the new element. It seems like a design error to me. On the other hand, it gave me a chance to clean the throttle body.
02-20-23, 06:47 PM
#27
Pole Position
I'm curious about the fuel filter. Are you speaking of the screen on the fuel intake for the fuel pump, inside the gas tank? It was my impression there isn't a fuel filter other than this, and certainly not one in identified in the maintenance schedule.
02-28-23, 12:30 AM
#28
Driver School Candidate
Thread Starter
correct, the fuel strainer it’s called
I doubt O2 sensors could cause misfire codes. That said, I have no experience troubleshooting misfire codes on my wife's ES as it has performed flawlessly for 12 years.
I'm curious about the fuel filter. Are you speaking of the screen on the fuel intake for the fuel pump, inside the gas tank? It was my impression there isn't a fuel filter other than this, and certainly not one in identified in the maintenance schedule.
I'm curious about the fuel filter. Are you speaking of the screen on the fuel intake for the fuel pump, inside the gas tank? It was my impression there isn't a fuel filter other than this, and certainly not one in identified in the maintenance schedule.
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