Rough Idle Flashing Cel

[Charles.waite]

Did you get the dipstick tube fully seated? I had to give mine a few solid taps with a hammer and a block of wood to get it to properly snap in.

[daihashi]

go back and look at the PCV. It's next to the dipstick tube; chances are that either that or the hoses that lead up to it are pooched.

Valve cover gasket and CCT leaks have a tendency to wander and end up in places you wouldn't expect.

[b7a4GT30]

Did you get the dipstick tube fully seated? I had to give mine a few solid taps with a hammer and a block of wood to get it to properly snap in.

Yes i tapped in a bunch of times with a rubber mallet!

go back and look at the PCV. It's next to the dipstick tube; chances are that either that or the hoses that lead up to it are pooched.

Valve cover gasket and CCT leaks have a tendency to wander and end up in places you wouldn't expect.

Ok, but if it was the PCV valve then wouldn't the oil cap be hard to take off when the engine is running?

[Charles.waite]

Yes i tapped in a bunch of times with a rubber mallet!



Ok, but if it was the PCV valve then wouldn't the oil cap be hard to take off when the engine is running?

A failed PCV valve should make it EASIER to take the oil cap off. But I've learned thats generally not a foolproof sign its the PCV, there can be a number of reasons that the block isn't under sufficient vaccum at idle to suck the oil cap down a little bit.

It could be the PCV, and that's honestly the likeliest culprit, but it could also be a failed check valve somewhere in the vacuum system or the Suction Jet Pump.

Heres a link for some of the PCV breather hose info: http://www.audizine.com/forum/showth...=1#post6016725

They often snap but since they're buried behind a bunch of stuff, its hard to spot...

[waldo1324]

Suction Jet Pump.

change that -- mine was completely clogged

oh and chec your Diverter Valve line. mine was cracked and was robbing -5 in Hg and gave me hard starts and idle.

if Charles hasnt suggested it , check your injector seats. if they are grimy, clean em or replace

Engage.

[waldo1324]

WALDOOOOOOOO WTF is up with ur avatar now!!! hahahahaha! i was like who the hell just posted 3 times in a row looks like something waldo would do and it was you even before i saw it. lmfao!

yes go forth and be blessed now my son

[b7a4GT30]

Ok i will check all the above!

[b7a4GT30]

OK i went over everything and it still has the same problem. Only now i can hear a loud very pronounced hissing sound (which means a leak) towards the back of the engine bay coming from the area right dead center back of the engine bay. In this pic http://www.google.com/imgres?q=b6+a4...9,r:1,s:0,i:74 (it is located right in front of the engine wall right around the area of the diverter valve looking piece [im not sure what this is called]). Anyways, that is where the loud hissing sound is coming from.

Any ideas?

[a44mark]

Sounds like it could be your pancake valve (PRV)... take a look at this link: http://www.audizine.com/forum/showth...-n00bs-like-me. It's #1 in the list.

Or, maybe even more likely, the 3-way breather hose right next to it. I've had that go bad on me twice...

Even though I don't have any bad symptoms yet, I haven't replaced any of these, so I'm going to work my way down the list as preventive maintenance (well, as preventive as one can be with nearly 165k on the clock...)

-Mark

[b7a4GT30]

Ok i will look into this today. Is there a solid way of testing to see if the PCV Valve is the culprit other than starting the engine and taking the oil cap off? I did that last night at it wasn't easy to take off while the engine was idling.

[onceover]

A failed PCV valve should make it EASIER to take the oil cap off. But I've learned thats generally not a foolproof sign its the PCV, there can be a number of reasons that the block isn't under sufficient vaccum at idle to suck the oil cap down a little bit.

Not always true. When one of the check valves died in my breather system it was nearly impossible to remove the cap while the engine was running. With a properly operating PCV the cap should "dance" on top of the valve cover

[Charles.waite]

Not always true. When one of the check valves died in my breather system it was nearly impossible to remove the cap while the engine was running. With a properly operating PCV the cap should "dance" on top of the valve cover

Interesting. My PCV system is bascially all new (034 Silicon kit) and all my check valves are new as well. Could the somewhat suspect 034 billet PCV valve be an issue? Might have to order up an OEM one and see if it changes anything...

[b7a4GT30]

Solved the problem!!!! It was the PVC valve and the three way breather hose. I swapped them right out cleared the codes and the car is back to normal!! Thanks for all your help!