Oil change/misfire

swerneck · March 13, 2012

I’ve just changed the oil of my Explorer Limited V8 2001, and the next day in the morning the engine started misfiring.
Can you see any connection of the misfire with the oil change?
Thanks!

gonenuke · March 13, 2012

Just a shoot in the dark. Could you have knocked a spark plug wire loose while changing the filter?

swerneck · March 13, 2012

No... I've checked that.
Thanks

1996BLKBauer · March 13, 2012

Does it throw any codes? if so, what are they?

swshawaii · March 13, 2012

My bet is on a loose/broken vacuum hose or a disconnected sensor wire.

swerneck · March 13, 2012

No DTC codes... Another strange thing that happened is that the EATC (temperature control) is all working, but the air from panel vents stopped. It's hard to relate all these problems, but it all started after the oil change.
Weird, no?

swerneck · March 13, 2012

swshawaii said:
My bet is on a loose/broken vacuum hose or a disconnected sensor wire.

Any suggestions where to start looking?

1996BLKBauer · March 13, 2012

swerneck said:
No DTC codes... Another strange thing that happened is that the EATC (temperature control) is all working, but the air from panel vents stopped. It's hard to relate all these problems, but it all started after the oil change.
Weird, no?

very weird, but that is when problems pop up, all at once. if the vents stopped blowing, try tapping the blower motor with a small hammer, or a but of a screw driver, and see if it comes alive, if it does, you need a new one soon.

But like stated above, a cracked, or unhooked Vacuum line will result in the problems you are having.

swerneck · March 13, 2012

1996BLKBauer said:
very weird, but that is when problems pop up, all at once. if the vents stopped blowing, try tapping the blower motor with a small hammer, or a but of a screw driver, and see if it comes alive, if it does, you need a new one soon.

But like stated above, a cracked, or unhooked Vacuum line will result in the problems you are having.

The blower motor is working, I can increase or decrease speed, but no air from panel vents, just floor and window...

Besides that, i'll check all hoses I can see if any is loose.

1996BLKBauer · March 13, 2012

swerneck said:
The blower motor is working, I can increase or decrease speed, but no air from panel vents, just floor and window...

Besides that, i'll check all hoses I can see if any is loose.

I see, use the search function, and look up blender door motor, that may be your problem. completely unrelated to the oil change, but I believe this is a some what common problem on the explorers.

bobflood · March 13, 2012

swerneck said:
The blower motor is working, I can increase or decrease speed, but no air from panel vents, just floor and window...

Besides that, i'll check all hoses I can see if any is loose.

May have lost the vacuum supply to the EATC unit. Default position is defrost; usually some leakage to floor. The vacuum supply comes from a vacuum reservoir under the pass front fender - always possible that vacuum line got messed up during oil change.

swerneck · March 14, 2012

That's it, problem solved. It was a disconnected vacuum line.

The open line caused the EATC to stop blowing air to panel vents, and the engine was behaving like a misfire... Connected it back, all normal.
Thanks all!
Sergio

Oil change/misfire

swerneck

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gonenuke

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swerneck

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1996BLKBauer

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swshawaii

swerneck

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swerneck

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1996BLKBauer

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swerneck

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1996BLKBauer

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bobflood

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