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1990 Chevrolet G 7.4L Excessive Emissions
Hi [...] 1990 chevy truck with 7.4 litre motor,fail the california emission for high HC at [...] only way I can bring the HC DOWN IF i leave the blk and tan (TIMING BY PASS) wire [...] timing is in spec. harmonic balancer is [...] we control pcm spark timing w...
FIX posted 11/14/2000
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Message Closed
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| VIN | 2GBJG31N4L |
| Engine | 7.4 L / 8 cyl |
| Emissions | T.B.I WITH KNOCK SENSOR |
| Symptoms | Excessive Emissions |
| Occurs | Idle |
Message Closed
Vehicle Data
1990 Chevrolet G
| VIN | 2GBJG31N4L |
| Engine | 7.4 L / 8 cyl |
| Emissions | T.B.I WITH KNOCK SENSOR |
| Symptoms | Excessive Emissions |
| Occurs | Idle |
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