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1991 Ford Mustang GT 5.0L Poor Idle Quality, Surge, Cuts out, Stall, Misfire
I like to thank everyone in advance. This 5.0 has the usual upgrades you find on almost every 5.0L to include aluminum street heads, a conservative cam, and a cobra intake. This vehicle will not idle unless you open the throttle about 5%. I also noticed that i...
FIX posted 9/21/2004
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Related Documents & Media | VIN | 1FACP42E3M |
| Engine | 5.0 L / 8 cyl / GAS |
| Trans | 5-speed Standard |
| Delivery | FI / SEFI |
| Emissions | OBDI |
| Symptoms | Poor Idle Quality, Surge, Cuts Out, Stall, Misfire |
| Occurs | Always, Idle |
| Misc. | Modified |
Trouble Codes
| 12 | Idle Speed Control motor or Air Bypass not controlling idle properly. |
| 21 | Engine Coolant Temperature ECT sensor out of range. |
| 34 | PFE sensor is/was out of range. |
Message Closed w/FIX
Vehicle Data
1991 Ford Mustang GT
| VIN | 1FACP42E3M |
| Engine | 5.0 L / 8 cyl / GAS |
| Trans | 5-speed Standard |
| Delivery | FI / SEFI |
| Emissions | OBDI |
| Symptoms | Poor Idle Quality, Surge, Cuts Out, Stall, Misfire |
| Occurs | Always, Idle |
| Misc. | Modified |
Trouble Codes
| 12 | Idle Speed Control motor or Air Bypass not controlling idle properly. |
| 21 | Engine Coolant Temperature ECT sensor out of range. |
| 34 | PFE sensor is/was out of range. |
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