What happens when you put too much fuel in the engine?
What happens when you put too much fuel in the engine?
It can cause serious mixture problems regardless of engine temperature. The fuel pump is capable of producing 80-100 psi of fuel pressure but the engine is designed to run with much less – usually no more than 36 psi. Excessive pressure literally pushes extra fuel into the engine when the injectors open.
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.
Where is the fuel vapor recovery system on a Jaguar XJ6?
The Series III XJ6 Jaguar has a fuel vapor recovery system, which captures excess fuel vapors inside the charcoal canister located in the front right fender. Sometimes this system gets clogged or a pressure valve malfunctions, leading to a substantial vacuum in the fuel tank.
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.
It can cause serious mixture problems regardless of engine temperature. The fuel pump is capable of producing 80-100 psi of fuel pressure but the engine is designed to run with much less – usually no more than 36 psi. Excessive pressure literally pushes extra fuel into the engine when the injectors open.
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 a fuel injector to leak over the engine?
So, the most common cause of leaky injectors is; the failure of the O-ring, where the injector meets the fuel rail. The O-ring can become, hard and brittle, from the heat of the engine. If it breaks, then fuel can leak out, over the engine. The other way an injector will leak is if, the injector body or nozzle cracks.
The Series III XJ6 Jaguar has a fuel vapor recovery system, which captures excess fuel vapors inside the charcoal canister located in the front right fender. Sometimes this system gets clogged or a pressure valve malfunctions, leading to a substantial vacuum in the fuel tank.
