Does that Explain the Rough idle on my car?


Asked by Mar 10, 2013 at 01:03 AM about the Nissan 300ZX

Question type: Maintenance & Repair

I just Bought this Car and I'm comparing it to my friends car and i believe i am missing that hose
piece. what does that do? Pls. anyone help me!

23 Answers

I believe the piece you are talking about is the PCV or positive crankcase ventillator tube, what allows crankcase air to go on a one way street up into the intake----if it's missing, you'll be suckin' air and puffin out with oil smoke-

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Best Answer

one of these?

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Omg You Guy are a BIG HELP for Beginners like me! God Bless you GUYS!!!! Nissan 300 RULES!! haha

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hmmmmmm.Now i am really Confused :(

Whoa...I certainly did not mean to cause confusion, I was only re~affirming Bob. he has it. What confuses you? I would be happy to help set things straight..


I think i don't have either of these too. hmmmm. Im going to check it now. crap... it's cold outside :-s

You must have them, in on variety or another. If the hose for the PCV valve is missing, not anything hooked up to the vacuum source you will have a massive vacuum leak, very bad, you would be able to hear it, and the idle will be very rough if it idles at all. What is that picture of?


I don't know what Bob or David are seeing but in the picture it looks like the arrow is pointing to a bushing on the throttle linkage.

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If i am not mistaken it's this one i am missing?

Yep TS I enlarged it and you are absolutely correct, it is.

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Bow on that bottom picture, it's hard to tell..but it looks like that is not a vacuum source, but being right behind the water pump it may be a heater hose. Does your heater work?


I Never Been So Thankful in ALL MY LIFE working on a Car Project! Thank You sooo much sir! Thanks to Bob nueske and tenspeed too! I hope the parts i'll be needing wont cost me much :( Happy Sunday God bless you all!

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hmmmm heater works. but i'm not really sure.. For sure the guy that i bought the car from said AC isn't working..

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I wish the Site will allow us to post 10 sec videos :(

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The PCV valve itself is about $20, and hoses not real expensive

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I can see it in the second picture. The arrows are pointing at the gold towers not the throttle linkage. It does look like it's missing a pair of hoses from the cam cover to the intake. Probably positive crank case vents.

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I'm Going to Check My local Auto Shop for it.

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Good idea farrell. Now this is from another parts house.. A1 CARDONE MASS AIR FLOW SENSOR, REMANUFACTURED -- A high quality, direct fit OE replacement mass air flow sensor; With A1 Cardone's 1-year or 18,000-mile warranty.

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If you want to post a video, put it on YouTube and then give us the link

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We do our best effort farrell, all of us do. Thanks for the acknowledgment .but that MAF image was meant for another question about a Venture, I was on the wrong place

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