First run on the dyno and It sucks

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Apr 22, 2007 | 11:53 PM

killerinparadise

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First run on the dyno and It sucks

Need some serious tuning any ideas why I am running so lean?? Car has 62k on it and to my knowledge there has been no previous tuning, my current mods are in the sig, I think my O2's may have been bad at the time so replaced them but I still don't feel any significant change, what else should I look into? we only ran it once on the dyno and I don't want to drive it around till I get this fixed, should I get a dyno tune or is there any better way to look into this, If anyone around the Buffalo, MN area has a wideband I could use to see if the 02's helped I would greatly appreciate it. FYI that's 17+:1 A/F ratio

I thought I read somewhere that at WOT it is the MAF that controls fuel should I look into this?

Last edited by killerinparadise; Apr 22, 2007 at 11:59 PM.

Apr 23, 2007 | 09:56 AM

DANOZ28

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From: MPLS MN

sorry i'm probably zero help but cant u have doug rippie adjust A/F ratio? if thats too expensive maybe mail order tune to get close however my mail order tune got me to 13.8 :1 still to lean. tpis, hi tech will all be expensive but do you want it done right? good luck

Apr 23, 2007 | 10:29 AM

LostCauseZ06

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clogged catalytic converters???? thatd be my bet.... there is no way in hell your car is running that lean... it would have been popping/detonating to high hell on the dyno....

Apr 23, 2007 | 10:52 AM

WS6FirebirdTA00

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From: North Carolina

MAF sensor, check for codes. I have seen them do this before, yet not throw codes also.

Apr 23, 2007 | 02:21 PM

killerinparadise

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Quote:

Originally Posted by LostCauseZ06

clogged catalytic converters???? thatd be my bet.... there is no way in hell your car is running that lean... it would have been popping/detonating to high hell on the dyno....

I thought so too it barely moved his sensor from the highest it can read, I've bought some new plugs incase I f'd the ones in there right now from running so lean, I'm going to pull the plugs, do some compression tests look for any leaks in the exhaust, pull the cats see if there clogged, clean the MAF and maybe run some fuel injector cleaner through it, hopefully I'll figure out whats the deal after all of that, if not it's off to the shop, anyone know how I can test the MAF without a tuning program?

Apr 23, 2007 | 06:01 PM

GreenBlood

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From: Schiller Park (NW burb of Chicago)

hope you get it straightened out so that you can enjoy all of the performance...

May 5, 2007 | 07:43 PM

ryanisfast

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From: Tacoma, WA

Yeah, might be the catylitic converter. Happened to me once on an old car i had and made a huge difference. I just kept driving the sh** out of and it finally blew a bunch of honey comb lookin stuff out the tailpipe. Then I had my power back and a little more top end power from the loss of it. Although...I did notice that when my catalytic converter clogged a had a lot more low end torque, but after 2500rpm, it would barely climb the rpms.