Misfire Cylinder 6

[nicheel8]

99 4Runner first had the P0133 code so I replaced the O2 sensor, cleaned the MAF sensor, and replaced the air filter. All was good for a couple of days.

Then I got the P0306 code and she shakes.

I have swapped the coils, checked the cables and replaced the plugs. Was running fine for about 20 miles, then all the same symptoms came back.

Should I take it in for a compression test and would you take it to the dealership to get tested?

Thanks.

 

[TheDurk]

99 4Runner first had the P0133 code so I replaced the O2 sensor, cleaned the MAF sensor, and replaced the air filter. All was good for a couple of days.

Then I got the P0306 code and she shakes.

I have swapped the coils, checked the cables and replaced the plugs. Was running fine for about 20 miles, then all the same symptoms came back.

Should I take it in for a compression test and would you take it to the dealership to get tested?

Thanks.

It would have been very nice to have looked at the old #6 plug when you replaced them. I'd pull it now (and maybe #1 to compare) and see what you have. Wet with gas? Fouled by oil? Washed clean by coolant?

 

[Kenworth]

Injector

 

[nicheel8]

It would have been very nice to have looked at the old #6 plug when you replaced them. I'd pull it now (and maybe #1 to compare) and see what you have. Wet with gas? Fouled by oil? Washed clean by coolant?

They looked ok. No oil or gas on the plugs. Since I had an extra set I just swapped them.

 

[nicheel8]

Injector

Should I get the compression checked first?

 

[poleclimber63]

99 4Runner first had the P0133 code so I replaced the O2 sensor, cleaned the MAF sensor, and replaced the air filter. All was good for a couple of days.

Then I got the P0306 code and she shakes.

I have swapped the coils, checked the cables and replaced the plugs. Was running fine for about 20 miles, then all the same symptoms came back.

Should I take it in for a compression test and would you take it to the dealership to get tested?

Thanks.

It would have been very nice to have looked at the old #6 plug when you replaced them. I'd pull it now (and maybe #1 to compare) and see what you have. Wet with gas? Fouled by oil? Washed clean by coolant?

As The Durk says...

if you check all electrical connectors, and the plugs don't show anything obvious, you could do the compression test yourself, Harbour Freight:

Compression Test Kit 8 Pc

Pittsburgh Automotive 69885 8 Piece Automotive Compression Test Kit
Compression Test Kit 8 Pc 69885 alternate photo #1
Pittsburgh Automotive - item#69885
Only: $29.99
Sale: $21.99

Also, if all else fails, above, it maybe a fuel injector. Measure the DC resistance of the injector = 14.5 ohms If you have a bad injector, they're easy to change, however, you have to remove the throttle body and plenum. There's a couple of painful steps ie removing the small coolant lines from the throttle body. You should replace the throttle body gasket, plenum gaskets, and injector seals (I used Felpro injector kit $6ea), its not bad, just be prepared.

If you're interested in the 4Runner Maintenance Manual just PM me.
Good luck!

Check everything twice.

 

[nicheel8]

So this morning I was going to get it tested.

No check engine light and no stuttering. Drove around all day and nothing. She's running fine.

After I swapped out the plugs and cables, I had a 1/4 tank of regular unleaded then I filled it up with Supreme Chevron. You think that would make a difference?

I love my 4Runner but sometimes she drive me nuts.