1990 GMC V1500 Suburban 5.7L Excessive Emissions
This vehicle will lose vacuum under load and NOX is failing. Tire size is 10 to 12" over factory spec. It is useing Thorley headers with 3" exhaust. Have tried 1.5", 2" and 2.5" restrictors in exhaust. 2" is best for loss of vacuum under load. NOX is still hig...
FIX posted 5/22/2008
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Message Closed w/FIX
Vehicle Data1990 GMC V1500 Suburban
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Message Closed w/FIX
Vehicle Data
1990 GMC V1500 Suburban
VIN | 1GKEV16K7L |
Engine | 5.7 L / 8 cyl / GAS |
Trans | 4-speed Automatic |
Delivery | FI / TBI |
Emissions | CA. |
Symptoms | Excessive Emissions |
Occurs | Always, Under Load |