Mechanics

CHECK ENGINE LIGHT

1997 Honda Civic

Engine Performance problem
1997 Honda Civic 4 cyl Front Wheel Drive Manual 250k miles

Autozone diagnostic test came back as " engine lean fuel trim". He said no parts needed only adjustment. Can you tell me where and what to adjust or do I need to take it in for specialized fuel metering? Runs rough at idle and losing gas mileage. Was 29mpg, now 23mpg. Thanks.E
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Rikynik
April 4, 2008.



Might be nice to know what the code number was since there are two very closely related. Anyway, here is a list of things to look at.

- Air induction system (filter and breather system)
- PCV hose connection
- PCV hose
- Injector blockage
- Mass air flow meter
- Engine coolant temp. Sensor
- Fuel pressure
- Gas leak on exhaust system
- Open or short in A/F sensor (bank 1 sensor 1) circuit
- A/F sensor (bank 1 sensor 1)
- ECM

Bruce Hunt
Apr 4, 2008.