Weird Idle,and didnt pass smog. help? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

BoostWanted · 03-15-2012, 09:02 AM

When i start my car it idles at bout 1100 then drops down to about 800. And when I sit there with it idling sometimes it makes like a puffing sound and you can feel the car shake.

Onto my smog, I failed the hc by about 20 and my no by about 300. Maybe I have a vacuum leak? How do i check? Sorry for not exact numbers. I dony have my smog paper right now.

Also another thing is when I'm driving and I put the car in neutral to coast to a light or something it stays at about 1100rpm until I come to a complete stop.

Edwin562 · 03-15-2012, 09:32 AM

Sounds like a vacuum leak. let your car on for a bit (at idle), spray some carb clean on possbile vacuum leak areas. if idle changes then yes you have a vacuum leak.

BoostWanted · 03-15-2012, 09:35 AM

Would that fix smog too?

Edwin562 · 03-15-2012, 09:45 AM

No, that will help you find the vacuum leak if you have one. High HC(Hydrocarbon) mostly indicates your burning too much fuel or oil.

BoostWanted · 03-15-2012, 09:46 AM

How can I fix that? I ran 91 with denaturated alcohol for the smog.

Edwin562 · 03-15-2012, 09:54 AM

Post info on your car.

BoostWanted · 03-15-2012, 09:56 AM

its a 95 S14. Has like 235k on the chassis and the last owner said the rebuilt engine has 90k on it. Uhh.. what else do you want to know? 5 speed..

03-15-2012, 09:02 AM	#1
BoostWanted Zilvia Junkie Join Date: Jan 2012 Location: Vallejo, CA Posts: 352 Trader Rating: (5) Feedback Score: 5 reviews	Weird Idle,and didnt pass smog. help? When i start my car it idles at bout 1100 then drops down to about 800. And when I sit there with it idling sometimes it makes like a puffing sound and you can feel the car shake. Onto my smog, I failed the hc by about 20 and my no by about 300. Maybe I have a vacuum leak? How do i check? Sorry for not exact numbers. I dony have my smog paper right now. Also another thing is when I'm driving and I put the car in neutral to coast to a light or something it stays at about 1100rpm until I come to a complete stop.

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03-15-2012, 09:32 AM	#2
Edwin562 Post Whore! Join Date: Nov 2009 Location: Whittier (562) Age: 35 Posts: 4,721 Trader Rating: (35) Feedback Score: 35 reviews	Sounds like a vacuum leak. let your car on for a bit (at idle), spray some carb clean on possbile vacuum leak areas. if idle changes then yes you have a vacuum leak.

03-15-2012, 09:35 AM	#3
BoostWanted Zilvia Junkie Join Date: Jan 2012 Location: Vallejo, CA Posts: 352 Trader Rating: (5) Feedback Score: 5 reviews	Would that fix smog too?

03-15-2012, 09:45 AM	#4
Edwin562 Post Whore! Join Date: Nov 2009 Location: Whittier (562) Age: 35 Posts: 4,721 Trader Rating: (35) Feedback Score: 35 reviews	No, that will help you find the vacuum leak if you have one. High HC(Hydrocarbon) mostly indicates your burning too much fuel or oil.

03-15-2012, 09:46 AM	#5
BoostWanted Zilvia Junkie Join Date: Jan 2012 Location: Vallejo, CA Posts: 352 Trader Rating: (5) Feedback Score: 5 reviews	How can I fix that? I ran 91 with denaturated alcohol for the smog.

03-15-2012, 09:54 AM	#6
Edwin562 Post Whore! Join Date: Nov 2009 Location: Whittier (562) Age: 35 Posts: 4,721 Trader Rating: (35) Feedback Score: 35 reviews	Post info on your car.

03-15-2012, 09:56 AM	#7
BoostWanted Zilvia Junkie Join Date: Jan 2012 Location: Vallejo, CA Posts: 352 Trader Rating: (5) Feedback Score: 5 reviews	its a 95 S14. Has like 235k on the chassis and the last owner said the rebuilt engine has 90k on it. Uhh.. what else do you want to know? 5 speed..