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1994 GMC K2500 Suburban SLE 7.4L Excessive Emissions
Posted to GM Driveability on 11/5/2007 8 Replies

HEY GUYS! THIS TRUCK CAME IN FOR SMOG FAILURE,(NOX)AND TIMMING OFF [...] set to 0. Reset timming to 4"before. failed 15mph at 1337ppm/ failed 25mph at 1012ppm. lambda test results were 1.001 at both speeds. we replaced cat.(w/ heavy duty [...])now tested again...

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car Vehicle Data

1994 GMC K2500 Suburban SLE

VIN 1GKGK26N7R
Engine7.4 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI / TBI
EmissionsCAILF,OBD1
SymptomsExcessive Emissions
OccursHot, Under Load
Misc.4X4
Message Closed w/FIX

car Vehicle Data

1994 GMC K2500 Suburban SLE

VIN 1GKGK26N7R
Engine7.4 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI / TBI
EmissionsCAILF,OBD1
SymptomsExcessive Emissions
OccursHot, Under Load
Misc.4X4