Short term fuel trims?

[strengthrehab]

Ok because car is buried in a garage right now.

I'll try loading an alternate tune tonight.

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[strengthrehab]

Swapped and then reloaded tune. Learn flag was at 0 and I wasn't able to take it for a drive/top-off yet. It was still running rough and same exhaust smell in the garage.

Anyone know the part numbers for the O2 sensors?

Any way that this is being caused by some catastrophic thing like compression loss? valve/timing issue?

I would think if those were a possibility, then the CEL/DTC would be apparent.

 

[Dr. Norts]

Pull your MAF and clean it. A dirty MAF will cause high STFT readings. It's easy enough to do and definitely can't hurt.

 

[strengthrehab]

Pull your MAF and clean it. A dirty MAF will cause high STFT readings. It's easy enough to do and definitely can't hurt.

Yeah, I realized there was some fine "debris" from grass in my airbox and filter.

 

[BmacIL]

Swapped and then reloaded tune. Learn flag was at 0 and I wasn't able to take it for a drive/top-off yet. It was still running rough and same exhaust smell in the garage.

Anyone know the part numbers for the O2 sensors?

Any way that this is being caused by some catastrophic thing like compression loss? valve/timing issue?

I would think if those were a possibility, then the CEL/DTC would be apparent.

Did you check for vacuum leaks on the bank that's showing high STFT?

 

[strengthrehab]

Did you check for vacuum leaks on the bank that's showing high STFT?

I've checked all vacuum lines. Didnt spray anything though.

 

[strengthrehab]

Cleaned MAF without change. I then unplugged bank 2 o2 sensor (first one) and had no change in readings.

I'd think that means it may be bad.

 

[Nuked]

Log the O2 readings on both banks and compare. They should be about the same. 1.00 lambda at idle, give or take a couple hundredths.

 

[strengthrehab]

Log the O2 readings on both banks and compare. They should be about the same. 1.00 lambda at idle, give or take a couple hundredths.

Yeah they are

 

[Nuked]

Yeah they are

Do they stay consistent while cruising? If so and they are both reading then I wouldn't think it is a bad o2, possibly one lazy but it should show a different reading.

 

[strengthrehab]

Did compression test. Then did leakdown test. Cylinder 6 had 100% leakdown and air escaped out throttle body.

What is weird is the #8 plug was completely bent (electrode).

What's even weirder? Not a single code or DTC.

 

[Jay-rod427]

Ruh Roh

 

[strengthrehab]

Hopefully just an intake valve issue. Boroscope showed good pistons with no evidence of damage.

Taking cam cover off tonight.

 

[strengthrehab]

Boroscope of 6. Piston looks good.

 

[strengthrehab]

Another view3

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