anybody know anything about adjusting the A/F ratio on SR20's - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

justeno_heat · 05-01-2005, 04:07 PM

I'm having a small problem with my SR. It seems that it is running a little lean on gas and I'm not sure how to adjust it. It blows out black smoke and it backfires a little when I give it a little bit of rev. Also it bogs when I first start it up but then when it warms up it goes away.

Flybert · 05-01-2005, 07:52 PM

How do you know it's running lean? What's your timing set too? Throwing any codes? What is your spark plug gap?

*fliprayzin240sx* · 05-01-2005, 10:51 PM

last i checked, back firing isnt a sign of leaning...its rich. Like flybert said, check your timing and gap your plugs to .028. Also, do you have an open air bov? That could be one of your issue or a leak somewhere in your pipings.

sideview_180sx · 05-02-2005, 12:13 AM

check for leaks and if your recirculating your BOV. also black smoke means air/lean = fuel/rich IOW you are running rich. Bogging on the start is due to a cold start. your engine runs rich when its cold to allow it to warm up quicker. once the engine is up to temp all is well, usually.

05-01-2005, 04:07 PM	#1
justeno_heat Leaky Injector Join Date: Mar 2003 Location: Denver, PA Age: 37 Posts: 125 Trader Rating: (0) Feedback Score: 0 reviews	anybody know anything about adjusting the A/F ratio on SR20's I'm having a small problem with my SR. It seems that it is running a little lean on gas and I'm not sure how to adjust it. It blows out black smoke and it backfires a little when I give it a little bit of rev. Also it bogs when I first start it up but then when it warms up it goes away. __________________ '91 Nissan 240sx Redtop SR20DET Stock T25 8 PSI Bomex body kit B&M short shifter ADR 17" rims 2 10" JL Audio W3's with Kenwood head unit Erebuni carbon fiber hood Koyo aluminum radiatior 240 down for the Summer FROWNING If NISMO stands for Nissan Motorsports, wouldn't Honda Motorsports be HOMO?

05-01-2005, 10:51 PM	#3
fliprayzin240sx Man w/ CTSV & a Car Seat Join Date: Aug 2002 Location: Tampa Posts: 17,998 Trader Rating: (19) Rides Gallery: fliprayzin240sx Feedback Score: 19 reviews	last i checked, back firing isnt a sign of leaning...its rich. Like flybert said, check your timing and gap your plugs to .028. Also, do you have an open air bov? That could be one of your issue or a leak somewhere in your pipings. __________________ If you think Zilvia has too many assholes... CLICK HERE!!!

05-02-2005, 12:13 AM	#4
sideview_180sx Zilvia FREAK! Join Date: Apr 2005 Location: somewhere north of mexico Posts: 1,538 Trader Rating: (3) Feedback Score: 3 reviews	check for leaks and if your recirculating your BOV. also black smoke means air/lean = fuel/rich IOW you are running rich. Bogging on the start is due to a cold start. your engine runs rich when its cold to allow it to warm up quicker. once the engine is up to temp all is well, usually. __________________ feel the rythym. feel the ride. get on up. it's bobsled time. COOL RUNNINGS!!! formerly sideviewcivic Save a Horse. Drift This Cowboy. AirBag Club Member #0014

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05-01-2005, 07:52 PM	#2
Flybert Post Whore! Join Date: Mar 2003 Location: none Posts: 3,862 Trader Rating: (7) Feedback Score: 7 reviews	How do you know it's running lean? What's your timing set too? Throwing any codes? What is your spark plug gap?