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1989 GMC Suburban 7.4L High idle in gear
Vehicle has normal idle (750 rpm) on start up when in park or [...] put in gear idle climbs from 600 rpms to 750 rpms. Idle air control counts go up. Engine idle speed when put back into park goes to 1400 rpms and will not return to a normal 750 idle unles...
FIX posted 1/24/1999
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Message Closed w/FIX
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| VIN | 1GKCR26N1K |
| Engine | 7.4 L / 8 cyl |
| Emissions | US FED |
| Symptoms | High Idle in Gear |
| Occurs | Under Load |
| Misc. | Tbi |
Message Closed w/FIX
Vehicle Data
1989 GMC Suburban
| VIN | 1GKCR26N1K |
| Engine | 7.4 L / 8 cyl |
| Emissions | US FED |
| Symptoms | High Idle in Gear |
| Occurs | Under Load |
| Misc. | Tbi |
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