Engine not idling right

[Jezza_hr]

Ok, I've done some more tests today:

- Cam belt is all perfectly aligned

- Spark plugs are perfectly fine, look strong and arc nicely (although spark total in the MAP screen does jump, which might be down to the engine having to adapt the engine's run speed)

- Fuel quality should be perfect, I fully drained the tank and gave it brand new fresh fuel. The fuel that came out did look pretty nasty.

- Adjusted the fuel trims and timing in the MAP screen with little to no noticeable changes apart from a raise in engine speed

- Return fuel line is working and not blocked. I squeezed the pipe which caused the engine to stall. can also hear bubbling in the tank if blown into

- Engine is fully grounded all around, so it shouldn't be a bad earth.

Things to note:

- There is no real change in the engine operation when removing any singular HT lead

- There is also no noticeable change in the idle when removing the brake booster line, but the engine drops out when removing the vacuum line to the FPR

- The engine still wants to keep running after switching it off, popping out of the intake as it splutters to a stop

- The spark plugs do have a fair amount of carbon deposits on them, leading me to believe they are getting sufficient amounts of fuel. Plus the distinct smell of fuel coming out of the exhaust.



I think this covers most of the things I can think of. If anyone can deduce something from this, to give me more of an answer as to what else I should be checking, then please do.

I will be checking on the brake booster tomorrow (to see if the pressure is released in the pedal when I switch on the engine) for air leaks and I will do some more tweaking on the fuel trims. If I can get a proper fuel pressure tester to see if there is something wrong there, I will.

Anything I could be missing?