Depends on the GVWR - for example, my 2001 F250 is OBD-I because it's over 8500GVWR.

 

Pull the plugs on the side with that O2 sensor acting weird. I wonder if you have a stuck/leaky injector.

 

Like, while it's running, disconnect one injector at a time? That's how I got my injected engine for the Sammi. White smoke and raw fuel out the tailpipe. Pulled one injector ata time until we hit one that was stuck open. The other three would almost kill the engine as sonn as they were disconnected, the one the engine would still run, then get better, then it would almost die. Plenty of power on highway. But, it also didnt ping. It's a SOHC 16-valve.

 

spark plugs. a pain, I know.

 

I must be missing something...if I pull the spark plugs out, or just disconnect the COPs, there won't be anything for the sensor to read, and it would only be running on 5 cylenders? Just trying to understand.

 

As a side note, while taking down the live data, it appered to me that the engine timing is based on throttle position and perhaps vacuum? Even still, while sitting still in shop hitting throttle by hand, timing was never below like 5* and never went above 8*. And I was goosing it up to around 2500 trying to get the timing to change more than 3*...

 

Alrighty people...another slightly winded update:

Replaced the 02 sensors. Pulled the plugs. All 10 were fuel soaked (not wet, but black and stunk of unburnt fuel). Ran a compression test. Cylinders 2 and 4 gave me some issues. I had to turn it over 15 revs (compression strokes) to get to the pressures listed. All numbers listed are the AVERAGE of three runs on each cylinders. The other eight cylinders only took 5 strokes to get up to pressure. I was surprised how much fuel I was smelling while running the compression test....

1:166
2:147
3:150
4:125
5:145

6:157
7:134
8:163
9:155
10:160

Cylinder 2:
Did NOT release pressure between stroke batches. I DID release pressure between 'sets'.
First 'set': 5 strokes=90, 10=125, 15=135.
Second 'set': 5=140, 10=148, 15=150.
Third 'set': 5=150, 10=155, 15=155.
Average of the final numbers from each set = 147.

Cylinder 4:
Did NOT release pressure between stroke batches. I DID release pressure between 'sets'.
First 'set': 5 strokes=142, 10=145, 15=WAY lower (didn't write it down...battery ran down). Charged battery (at 40A) for 30 min and re-ran. 5 strokes=100, 10=108, 15=battery, again?!?!? Another 30 min charge. 5 strokes=125, 10=125, 15=125. Got 125 on all other batches on this cyl.

All the other cylinders only required five strokes to get to their max pressure.

My Haynes manual states the "lowest cylinder must be within 75% of the highest cylinder." Going by the numbers, cylinder 4 is only .5 above that. 7 isn't very encouraging either, compared to the other 8 that is.

Stuffed the plugs back in, with new plug boots this time.

Runs (in shop) WAY better. Not NEAR as rich smelling. Still has some hesitation when I blip the throttle. 02 sensor data looks MUCH better now, and they both match pretty close. Took her for a drive. Yup, still has a hesitation that wasn't there when I drover her the first time. Still pings bad. Not as bad as the last test drive, but still not right. Pulled back into shop, no CEL. Disconnected both batteries, and dumped some fuel system treatment in the tank. Tomorrow I will get some new live data written down to compare to the old.

The straws are getting shorter and shorter. I may just have to resort to some seafoam...

McMechanic

 

Quick question: Did you open the throttle when doing the compression check?

 

No, I didn't....

 

I figured 125psi was kindof low, but it was a consistent 125 over the three runs, and tbat was the lowest cyl. All the ones that were in the higher ranges were also consistent, but with only 5 strokes, not 15.

 

During a compression check, throttle plates must be open.

 

So i gotta pull the plugs. Again. Damnitall. But it has drive by wire...? If I hold the pedal down while cranking will that keep the plates open?

Considering how (relatively) even the numbers were, you think i should do it over? Only two of the cyl,were funky. All the others were within 5psi on the first set of cranks. So when I say average, there was only a 5-10psi differnce between each of three cranking sessions on each cyl.

Could a compression issue (low due to ring issues or high due to carbon) cause the pinging?

And what else could cause the excessive fuel on tbe plugs? The one bank with the bad 02, I expected, but the other bank with the good 02 looked and smelled exactly like the 'bad' 02 side....

 

Thankfully, we are between harvests so I do have a little time luxury. Anything else I should be doing/looking for while I have the plugs out this time?

 

Don't bother doing it over, those numbers are fine for the throttle being closed. I suspect your numbers might be all over the place because fuel is in the cylinders while you're doing this.

When you were cranking it, did you unplug the injectors or anything else to stop the injectors from firing?

 

All the injectors were disconnected. No way fuel was getting in there. I even pulled the fuel pump fuse. Thats why i was surprised as to the amount of fuel i was smelling. I figured after the first two cylinders testing she should have been blown out. If the fuel pressure regulator is on its way out, could that be a cause of too much fuel or do they go lean when tbey fail? Im gonna hook up the batteries and get her warmed up, take down more live data info, and take her for another drive.