|
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
iATN Members:
Login to view full TechHelp request Auto Repair Pros: Join iATN to read this TechHelp request Vehicle Owners: Find a nearby iATN member to repair your vehicle 10 Replies Received (View Replies)10 Replies Received (Hide Replies)
|
Message Closed w/FIX
|
10 Replies Received
10 Replies Received
Related Documents & Media | 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 |
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 |
Video