My 1999 Brava suffers from power loss. Sometimes the power is normal, sometimes weakened, regardless of weather or engine temperature. Spark plugs and lambda sensor have been replaced recently.
I took the car to an authorized fiat service center, they said computer shows bad knock sensor, but they didn't have a replacement on stock so I took the car home. The knock sensor seems well fastened. I disconnected the knock sensor and measured the impedance: 566 ohm, which should be ok. I left the sensor disconnected and took the car for a test drive. No improvement nor decline whatsoever, for some time the power was ok, then lost.
Also, it happens that idle revs are so erratic I feel the car shaking, but only with cold engine and rarely.
When I burn most of the fuel I'll try a higher octane fuel. Till then, what should I do or try next? I'd like to fix this myself because I'm short on money at the moment.
I took the car to an authorized fiat service center, they said computer shows bad knock sensor, but they didn't have a replacement on stock so I took the car home. The knock sensor seems well fastened. I disconnected the knock sensor and measured the impedance: 566 ohm, which should be ok. I left the sensor disconnected and took the car for a test drive. No improvement nor decline whatsoever, for some time the power was ok, then lost.
Also, it happens that idle revs are so erratic I feel the car shaking, but only with cold engine and rarely.
When I burn most of the fuel I'll try a higher octane fuel. Till then, what should I do or try next? I'd like to fix this myself because I'm short on money at the moment.