Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
Owner of a Jaguar S-type, petrol-engine, year 2002. 3 litre.
The engine malfunction warning light (yellow) infomring me that performance is compromised frequently appears, especially when travelling over 110 m/h.
Checked all hoses and tubes and replaced all sensors.
The problem will not go away.
Any suggestions?
Do you have access to scan data? That'd be the place to start, as we could look at fuel trim data to see when the engine is running lean.
The fact that the light comes on at speed would tend to suggest a fuel issue, either with the MAF or fuel pressure. But, the trims will tell us if that's true or not.
Dear Tyler
Very grateful for your suggestions. I expect an engine data scanner to be delivered to me some time next week.
Hopefully this will identify the problem.
Thanks again
Deryck
