I may have figured out my detnation and lean AFR problem.....

tacbear · 01-17-2006, 07:44 PM

For those that don't know I ran 3 times at Steele and had to let off at 1100' for detonation one time and lean AFR twice. (tried 3 different tunes).

Well I just found out that the fuel pump that I installed was not a SVT Focus pump, it was a regular Focus pump. So I am running a 381.5 rwhp motor on a 90 rwhp pump. Does anyone hear think that might be my problem??

QWKSNKE · 01-17-2006, 07:48 PM

I had a guy who WORKS the parts dept at a Ford dealership try to tell me that all focus pumps were the same.

QWKSNKE · 01-17-2006, 07:50 PM

by the way, could you see your fuel pressure when making those runs?

Italian LX · 01-17-2006, 07:51 PM

If that's your problem then you should've seen a drop in fuel pressure.

The Rock 326 · 01-17-2006, 08:10 PM

When you figure out the detonation problem, let me know too!

tacbear · 01-17-2006, 08:40 PM

Quote:

Originally Posted by QWKSNKE

by the way, could you see your fuel pressure when making those runs?

I don't have a FP gauge, AFR was fluctuating back and forth from 12 to 12.9.
This is from the Ford Parts "Guru" on Modular Depot:

Quote:

part #'s are as follows> Focus SVT 3S4Z-9H307-BA which was replaced by a 3S4Z-9H307-BC
regular Focus > build date before 12/6/01 > 1M5Z-9H307-AA which was replaced by = 1M5Z-9H307-AB > then went to a 1M5Z-9H307-AC > and that went to a 1M5Z-9H307-CA
regular Focus built from 12/06/01 > 2M5Z-9H307-AA then that was replaced by a 2M5Z-9H307-AB which went to a 2M5Z-9H307-AD

ME:

Quote:

So Randy if I have the Focus Pump part#1M5Z-9H307-CA, is this for a NON SVT Focus and am I running the wrong one for a Supercharged GT??

ANSWER:

Quote:

that is correct, you have the wrong pump. please do not use that pump wth your combo.

EZ SPEED · 01-18-2006, 02:58 AM

Quote:

Originally Posted by tacbear

AFR was fluctuating back and forth from 12 to 12.9.

QWKSNKE · 01-18-2006, 03:59 AM

Quote:

Originally Posted by KB ZILLA

It would scare me just seeing the a/f run at 12:0.

The Rock 326 · 01-18-2006, 07:08 AM

Quote:

Originally Posted by tacbear

I don't have a FP gauge, AFR was fluctuating back and forth from 12 to 12.9.
This is from the Ford Parts "Guru" on Modular Depot:

ME:

ANSWER:

Did you get yours from MPH??

tacbear · 01-18-2006, 08:00 AM

Quote:

Originally Posted by The Rock 326

Did you get yours from MPH??

NO, you probably have the right one.

01-17-2006, 07:44 PM	#1
tacbear LE equipment inventor.... Join Date: Dec 2004 Location: Jasper,AL Posts: 1,751	I may have figured out my detonation and lean AFR problem..... For those that don't know I ran 3 times at Steele and had to let off at 1100' for detonation one time and lean AFR twice. (tried 3 different tunes). Well I just found out that the fuel pump that I installed was not a SVT Focus pump, it was a regular Focus pump. So I am running a 381.5 rwhp motor on a 90 rwhp pump. Does anyone hear think that might be my problem??

01-17-2006, 07:48 PM	#2
QWKSNKE 3v's are slow Join Date: Dec 2004 Location: Here and There Posts: 17,152	Re: I may have figured out my detnation and lean AFR problem..... I had a guy who WORKS the parts dept at a Ford dealership try to tell me that all focus pumps were the same. __________________ 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

01-17-2006, 07:50 PM	#3
QWKSNKE 3v's are slow Join Date: Dec 2004 Location: Here and There Posts: 17,152	Re: I may have figured out my detnation and lean AFR problem..... by the way, could you see your fuel pressure when making those runs? __________________ 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

01-17-2006, 07:51 PM	#4
Italian LX Daddy x4 ...we're done Join Date: Dec 2004 Location: Oxford, AL Posts: 11,551	Re: I may have figured out my detnation and lean AFR problem..... If that's your problem then you should've seen a drop in fuel pressure. __________________ -Brian '86 Mustang GT Convertible '88 Mustang LX coupe '11 Odyssey TE '21 Insight Touring

01-17-2006, 08:10 PM	#5
The Rock 326 Friends Join Date: Dec 2004 Posts: 908	Re: I may have figured out my detnation and lean AFR problem..... When you figure out the detonation problem, let me know too! __________________ 02 GT S/C'd 406WHP/382WTQ 94 Explorer XLT