Too Lean?

ujslost · 06-26-2005, 08:01 AM

Ok i remember Lee had a post about a popping out the intake and tail pipes talking about which meant it was lean and or rich.
Ya said that popping tail pipes was lean
and the intake was rich correct.
Well my air fuel ratio guage tells me that when idle mine is off the scale lean, and when driving its in the stoich area, but when its cold the bastard wants to buck and pop out the tail pipes(not backfireing popping). After it warms up it quits popping but still never goes rich when i am beating on this thing even at full or part throttle. So my question is this. Should I possibly need to up the fuel pressure some?
Now I havent had a chance to put my FPG on the rail yet to see what its set at now, Which i will do today, and then edit this post. But with a 24lb injector and gt40 heads headers TFstage1 cam and typhoon intake, I am going to start out at 40-42 psi. Does this sound good to you guys? And then probly pull the timing up also, i had it set at 16* and it was detinating, so I have it turned down to around 14* now.
Opinions and tech help appreciated.

QWKSNKE · 06-26-2005, 08:48 AM

I believe its the other way around. Popping out the exhaust is 'rich' and backfiring out the intake is lean/ timing off.

ujslost · 06-26-2005, 08:57 AM

i got to thinking about that after i posted that, Thanks Lee. Popping could be an exhaust leak also. I know i got a collector leaking a little.

QWKSNKE · 06-26-2005, 09:09 AM

yep. Mine was doing it because base timing was set around 4 degrees and under boost I was going to about 16 degrees retarded

Shorty · 06-26-2005, 10:34 AM

Italian LX · 06-26-2005, 12:05 PM

I recommend doing a cylinder leak-down test.

Wicked · 06-26-2005, 03:25 PM

About 36 psi should be a good starting point when you get the FP gage on.

ujslost · 06-26-2005, 05:39 PM

set fp to 42 , sucker runs and idles alot better, doesnt idle and run like a carbed car on a cold day now, cranks right up
Now a new problem
when I make a sharp right turn the car dies , like the gas goes to one side of the tank and starves the pump. This has happened 3 times now. First time I was doing a dougnut LMAO!

06-26-2005, 08:01 AM	#1
ujslost Senior Member Join Date: May 2005 Location: ALBERTVILLE, AL Posts: 498	Too Lean? Ok i remember Lee had a post about a popping out the intake and tail pipes talking about which meant it was lean and or rich. Ya said that popping tail pipes was lean and the intake was rich correct. Well my air fuel ratio guage tells me that when idle mine is off the scale lean, and when driving its in the stoich area, but when its cold the bastard wants to buck and pop out the tail pipes(not backfireing popping). After it warms up it quits popping but still never goes rich when i am beating on this thing even at full or part throttle. So my question is this. Should I possibly need to up the fuel pressure some? Now I havent had a chance to put my FPG on the rail yet to see what its set at now, Which i will do today, and then edit this post. But with a 24lb injector and gt40 heads headers TFstage1 cam and typhoon intake, I am going to start out at 40-42 psi. Does this sound good to you guys? And then probly pull the timing up also, i had it set at 16* and it was detinating, so I have it turned down to around 14* now. Opinions and tech help appreciated.

06-26-2005, 08:48 AM	#2
QWKSNKE 3v's are slow Join Date: Dec 2004 Location: Here and There Posts: 17,152	Re: Too Lean? I believe its the other way around. Popping out the exhaust is 'rich' and backfiring out the intake is lean/ timing off. __________________ 2009 Porsche Carrera S 2008 ///AMG C63.. Eurocharge Tune. RIP 2019 AMG GLC43..wife's 03 F250 SD.. Edge Evo, AFE Stage 1 CAI 08 GT. JBA axle back, FRPP springs, FRPP swaybars.. daughter's 01 Cobra vert... wife's I need a new toy

06-26-2005, 08:57 AM	#3
ujslost Senior Member Join Date: May 2005 Location: ALBERTVILLE, AL Posts: 498	Re: Too Lean? i got to thinking about that after i posted that, Thanks Lee. Popping could be an exhaust leak also. I know i got a collector leaking a little.

06-26-2005, 09:09 AM	#4
QWKSNKE 3v's are slow Join Date: Dec 2004 Location: Here and There Posts: 17,152	Re: Too Lean? yep. Mine was doing it because base timing was set around 4 degrees and under boost I was going to about 16 degrees retarded __________________ 2009 Porsche Carrera S 2008 ///AMG C63.. Eurocharge Tune. RIP 2019 AMG GLC43..wife's 03 F250 SD.. Edge Evo, AFE Stage 1 CAI 08 GT. JBA axle back, FRPP springs, FRPP swaybars.. daughter's 01 Cobra vert... wife's I need a new toy

06-26-2005, 10:34 AM	#5
Shorty Pr0j3ct P1mp T1t3, y0! Join Date: Dec 2004 Location: Somewhere wondering why Crimson stole my avatar Posts: 2,022	Re: Too Lean? __________________ 93 GT----225rwhp/287rwtq--------1/4 mile= (but getting better)

06-26-2005, 12:05 PM	#6
Italian LX Daddy x4 ...we're done Join Date: Dec 2004 Location: Oxford, AL Posts: 11,551	Re: Too Lean? I recommend doing a cylinder leak-down test. __________________ -Brian '86 Mustang GT Convertible '88 Mustang LX coupe '11 Odyssey TE '21 Insight Touring

06-26-2005, 03:25 PM	#7
Wicked Friends Join Date: Dec 2004 Location: Pell City, AL Posts: 1,371	Re: Too Lean? About 36 psi should be a good starting point when you get the FP gage on. __________________ 2001 Cobra 'Vert Procharged and Intercooled 455rwhp/441rwtq Work Car: 2005 Honda Odyssey 400 whp Turbo V6, 6-speed, full cage, H&R Suspension, Brembo Brakes

06-26-2005, 05:39 PM	#8
ujslost Senior Member Join Date: May 2005 Location: ALBERTVILLE, AL Posts: 498	Re: Too Lean? set fp to 42 , sucker runs and idles alot better, doesnt idle and run like a carbed car on a cold day now, cranks right up Now a new problem when I make a sharp right turn the car dies , like the gas goes to one side of the tank and starves the pump. This has happened 3 times now. First time I was doing a dougnut LMAO!