backfire at low idle? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

sairaag · 04-25-2005, 02:36 PM

hello just wondering if anybody experience alot of back fire when yoru on low idle for examlbe I can be driving my car and I will be in 2nd doing 20 or so and the car will back fire when I let go of the gas and the car idles low. mods on car are

sr20det engine
apex n1 exhaust
3" downpipe no cat
tubular headers and o2 housing
fmic
elec fan and radiator
tial BOV
stage 3 exedy puck clutch
turbo xs controller running at 11 psi

the back fire is not once in a while happends quiet often but only at low idle not at high rpm or while I am driving only when I let go of the gas.

s13gonwild · 04-25-2005, 02:40 PM

happends all day long to me...but im KA..But i also have no cat, So im assuming thats the reason why. Dont loose anysleep over it haha its nothing major.

sairaag · 04-25-2005, 02:42 PM

Quote:

Originally Posted by s13gonwild

happends all day long to me...but im KA..But i also have no cat, So im assuming thats the reason why. Dont loose anysleep over it haha its nothing major.

yeah was just checking to see if it's normal on the sr20det to do that. don't want my valves to bend or some crazy stuff like my eclipse did hehehe.

the head · 04-25-2005, 03:09 PM

rather common with an atmoed BOV if you recirc it that helps because the car wont run rich when the bov opens

m0rex · 04-26-2005, 01:06 AM

How about on an NA? My ka backfires like bitch at low rpms im not running a cat either.

the head · 04-26-2005, 08:07 AM

probably because you are not running a cat

sairaag · 04-26-2005, 10:15 AM

Quote:

Originally Posted by the head

probably because you are not running a cat

true but when I did emissions and I put my cat on it backfire also not sure if it was less or more now.

the head · 04-26-2005, 10:44 AM

Quote:

Originally Posted by sairaag

true but when I did emissions and I put my cat on it backfire also not sure if it was less or more now.

do you have a recirced BOV?

drew935 · 04-26-2005, 12:24 PM

sounds like an exhaust leak to me. This happened to my friend with her Jetta. We found out that it was the exhaust that had a leak in the b-pipe near the muffler. It sucks up air, creating a vacuum when you let off the gas pedal. And PoP

drew935 · 04-26-2005, 02:26 PM

I was reading through the FSM and saw this.

Diagnostic Procedure 21 - Backfire through the Exhaust
Check Engine Coolant Temperature Sensor and its circuit. If No Good (N.G.) then replace or repair. Inspection End.

ref: EC & EF-89

We need to read through the FSMs more. It answers a lot of questions

nissan_driver24 · 04-26-2005, 02:48 PM

happens to my car all the time, it sounds like a gun shot on my car cause i have a straight pipe.... and it's the bov that makes it happens.... my s-afc kinda helps it not be as loud...

04-25-2005, 02:36 PM	#1
sairaag Zilvia Member Join Date: Mar 2005 Location: new milford, ct Posts: 153 Trader Rating: (0) Feedback Score: 0 reviews	backfire at low idle? hello just wondering if anybody experience alot of back fire when yoru on low idle for examlbe I can be driving my car and I will be in 2nd doing 20 or so and the car will back fire when I let go of the gas and the car idles low. mods on car are sr20det engine apex n1 exhaust 3" downpipe no cat tubular headers and o2 housing fmic elec fan and radiator tial BOV stage 3 exedy puck clutch turbo xs controller running at 11 psi the back fire is not once in a while happends quiet often but only at low idle not at high rpm or while I am driving only when I let go of the gas.

04-25-2005, 03:09 PM	#4
the head Nissanaholic! Join Date: Jul 2002 Location: in a dark room mastering the art of typing with one hand Posts: 2,164 Trader Rating: (3) Feedback Score: 3 reviews	rather common with an atmoed BOV if you recirc it that helps because the car wont run rich when the bov opens __________________ I never knew you could do that with an eggplant

04-26-2005, 08:07 AM	#6
the head Nissanaholic! Join Date: Jul 2002 Location: in a dark room mastering the art of typing with one hand Posts: 2,164 Trader Rating: (3) Feedback Score: 3 reviews	probably because you are not running a cat __________________ I never knew you could do that with an eggplant

04-26-2005, 12:24 PM	#9
drew935 Zilvia Addict Join Date: Nov 2003 Location: Silver Creek - San Jose Posts: 996 Trader Rating: (0) Feedback Score: 0 reviews	sounds like an exhaust leak to me. This happened to my friend with her Jetta. We found out that it was the exhaust that had a leak in the b-pipe near the muffler. It sucks up air, creating a vacuum when you let off the gas pedal. And PoP __________________ I'm driving fast -drew

04-26-2005, 02:26 PM	#10
drew935 Zilvia Addict Join Date: Nov 2003 Location: Silver Creek - San Jose Posts: 996 Trader Rating: (0) Feedback Score: 0 reviews	I was reading through the FSM and saw this. Diagnostic Procedure 21 - Backfire through the Exhaust Check Engine Coolant Temperature Sensor and its circuit. If No Good (N.G.) then replace or repair. Inspection End. ref: EC & EF-89 We need to read through the FSMs more. It answers a lot of questions __________________ I'm driving fast -drew

04-25-2005, 02:40 PM	#2
s13gonwild BANNED Join Date: Jan 2005 Location: cali Posts: 466 Trader Rating: (0) Feedback Score: 0 reviews	happends all day long to me...but im KA..But i also have no cat, So im assuming thats the reason why. Dont loose anysleep over it haha its nothing major.

04-26-2005, 01:06 AM	#5
m0rex Zilvia FREAK! Join Date: Sep 2004 Location: Nebraska Posts: 1,070 Trader Rating: (0) Feedback Score: 0 reviews	How about on an NA? My ka backfires like bitch at low rpms im not running a cat either.

04-26-2005, 02:48 PM	#11
nissan_driver24 Zilvia Junkie Join Date: Oct 2002 Location: Sacramento, CA Age: 39 Posts: 451 Trader Rating: (2) Feedback Score: 2 reviews	happens to my car all the time, it sounds like a gun shot on my car cause i have a straight pipe.... and it's the bov that makes it happens.... my s-afc kinda helps it not be as loud... __________________ --240sx Driver Since 2002 to 2013--

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