Pop Quiz Time!

RamTech · Aug 1, 2011

Ok, here's a little diagnostic head scratcher for anyone interested. An '03 Dakota with a 3.9 V6 with 84k miles is in for a misfire. The source of the misfire has been identified as a worn out secondary ignition and vacuum leak from a plenum pan gasket. During the diagnostic process, a compression test was performed with the following results. cylinders 1,3,4,5 & 6 are showing between 120-140 lb. psi. Cylinder #2 is showing 180 lb. psi. Anyone want to venture a guess as to the cause of the unusually high reading on #2?

wermbang · Aug 1, 2011

I am guessing something cool and ******** all in one

RamTech · Aug 1, 2011

Not really, but it's pretty simple and makes perfect sense.

Musclemckeester · Aug 1, 2011

Where's choices A, B, C, and D?

RamTech · Aug 1, 2011

No hints just yet!

The Assassin · Aug 1, 2011

I'm going to bet it's something stupid simple...

sullivan · Aug 1, 2011

build up of carbon on cylinder 2 piston? Faulty decompression cam?

RamTech · Aug 1, 2011

BigHorn 4 Life said:
I would say it has something to do with the leak.

Nope. Nothing to do with the vacuum leak.

truckin151 · Aug 1, 2011

Carbon build up

Bigtman07 · Aug 1, 2011

I think we should have question of the day!!! lol Hmmmmm let me think about this.

RamTech · Aug 1, 2011

truckin151 said:
Carbon build up

We have a winner! Carbon buid up on the #2 piston caused the compression to be higher than the average. Upon removal of the intake, a sludge trail was found in the intake runner for #2 and a borescope confirmed my suspicion.

Bigtman07 · Aug 1, 2011

Wow! Never would have guessed that!!

truckin151 · Aug 1, 2011

sullivan said:
build up of carbon on cylinder 2 piston? Faulty decompression cam?

Technically he won since he posted it first....... but his was a question, mine was an answer :Wedgie:

The Assassin · Aug 1, 2011

Any pix? This is cool Randy...I agree we should have a QOTD!

dodgeman70592 · Aug 1, 2011

What does the winner get?

sullivan · Aug 1, 2011

I was shooting those out as possible reasons with a "is it this"

RamTech · Aug 1, 2011

The Assassin said:
Any pix? This is cool Randy...I agree we should have a QOTD!

No pics for this one since I had already cleaned up the sludge in the runner before I came up with the pop quiz idea and trying to take a pic of the borescope screen didn't work. I dunno if I could come up with something good like this everyday but perhaps nce a week? If anyone else wants to post up something, that would be great.

RamTech · Aug 1, 2011

dodgeman70592 said:
What does the winner get?

Hearty congratulations? It's too bad we don't have a prize vault, huh?

sullivan · Aug 1, 2011

QOTD would rock, I love figuring stuff out.

wermbang · Aug 1, 2011

winner gets one nana :party36:

Pop Quiz Time!

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