Unsteady air/Fuel ratio causing overloading

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Unsteady air/Fuel ratio causing overloading

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Mitsubishi Forums >> Tech Help and Information >> PCM & Fuel Systems >> Unsteady air/Fuel ratio causing overloading

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Unsteady air/Fuel ratio causing overloading - 8/10/2007 11:54:59 AM

GREDDY_GST

Posts: 19
Joined: 5/8/2006
Status: offline

So, i have a 98 gst with greddy 18g turbo and safc-2 and many other upgrades, my problem is that my car is not keeping a steady air/fuel ratio, it will go lean for like 2 seconds then it will stick and rich for 2 and then back again and it is causeing fuel overload and is running like crap, so if anyone has dealt with something like this please let me know it would help alot thanks.

Post #: 1

RE: Unsteady air/Fuel ratio causing overloading - 8/10/2007 3:58:39 PM

silvercoupe97

Posts: 3008
Joined: 11/10/2006
Status: offline

Is this reading from a wideband? If this is from you narrowband, that doesn't say anything to me. It almost sounds like an idle issue. Listen to your car and besides stating that it runs like crap, tell us how it sounds, what it's doing, blah, blah.

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Thanks,
John
6 bolt/2g head,1G rods/2G pistons,FPBig28,MBC,Forge 1G DV,alky inj,AFPR,255lph,780cc, 3" turboback,Centerforce,4 spider,FMIC, Prosport Boost&EGT gauges,AEM wideband,DSMlink, AGX/Skunk2

(in reply to GREDDY_GST)

Post #: 2

RE: Unsteady air/Fuel ratio causing overloading - 8/15/2007 6:45:29 AM

1ViciousGSX

Posts: 132
Joined: 7/27/2007
From: MitsuStyle.com
Status: offline

Which BOV and bosst controller do you have? Have you checked for boost leaks?

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RE: Unsteady air/Fuel ratio causing overloading - 8/15/2007 10:18:20 AM

TheEngineer

Posts: 10261
Joined: 1/25/2006
Status: offline

when is it doing this. At what rpms or is it just at idle that you have the problem. Need some more info. On a norrowband it is supposed to go back and forth at idle

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ORIGINAL: pilsenblue
Even tho My car looks great It will never be fast. Kinda like a hot girl that dosent give it up

(in reply to GREDDY_GST)

Post #: 4

RE: Unsteady air/Fuel ratio causing overloading - 8/15/2007 4:11:44 PM

ComposeEvo

Posts: 322
Joined: 10/4/2006
From: Sunny Miami
Status: offline

sounds like idling issues of your reading through a narrow band. way to vague of details.

and what do you mean running like crap? bogging, not enough boost? too rich? feels like it sputurs?

let us know so that we may help

Gus

(in reply to TheEngineer)

Post #: 5