How to diagnose rich running on Jaguar XJ6?
How to diagnose rich running on Jaguar XJ6?
Diagnosing rich running on the fuel injected 4.2L engine, covers checking of the coolant temperature sensor, fuel pressure regulator, oxygen sensor, fuel injectors, cold start circuit, fuel changeover system, air flow meter (AFM), and ECU. This information pertains to the Jaguar XJ6 Series II-III models with the fuel injected 4.2 engine.
What causes rich fuel mixture on EFI XJ6?
The coolant temp sensor is a common culprit. The main purpose of this sensor is to “tell” the ECU that the engine is cold so that a richer mixture, required with a cold motor, will be provided. In this sense it is similar in intent to an automatic choke on a carbureted engine.
What kind of engine does the Jaguar XJ6 have?
This information pertains to the Jaguar XJ6 Series II-III models with the fuel injected 4.2 engine. However, in a broader sense, many of the items mentioned apply to other fuel injected models as well.
Where are the return valves on the XJ6?
The return valves are located in the rear wheel wells behind semi-rectangular sheet metal covers. Turn the key “on”, select the right tank, and using your test light check for voltage at the white/purple wire for each valve. Your light should show 12 volts at all three valves. Now, select the left tank and make the same voltage tests.
Diagnosing rich running on the fuel injected 4.2L engine, covers checking of the coolant temperature sensor, fuel pressure regulator, oxygen sensor, fuel injectors, cold start circuit, fuel changeover system, air flow meter (AFM), and ECU. This information pertains to the Jaguar XJ6 Series II-III models with the fuel injected 4.2 engine.
This information pertains to the Jaguar XJ6 Series II-III models with the fuel injected 4.2 engine. However, in a broader sense, many of the items mentioned apply to other fuel injected models as well.
The coolant temp sensor is a common culprit. The main purpose of this sensor is to “tell” the ECU that the engine is cold so that a richer mixture, required with a cold motor, will be provided. In this sense it is similar in intent to an automatic choke on a carbureted engine.
Where is the fuel vapor cannister on a XJ6?
If this happens, excess fuel can be drawn into the fuel vapor cannister (in front of the right front tire) and, from there, is drawn by engine vacuum directly into the engine. A fuel drip in the area of the front wheel is an obvious indicator.
If this happens, excess fuel can be drawn into the fuel vapor cannister (in front of the right front tire) and, from there, is drawn by engine vacuum directly into the engine. A fuel drip in the area of the front wheel is an obvious indicator.
