I've taken on Jamesy12345's 460 Turbo and to a certain extent eggs is eggs, so I'm asking around here if anyone's any ideas as it kinda has me and James stumped!
So... Cold starting is fine and it settles down to a nice steady idle.
However, once warm the idle stays a little high and because it's an auto, surges and almost tugs against the gearbox when stationary in drive, to the point that it'll do around 15mph on it's own and when held stationary and knocked into neutral the revs will kick up to almost 2k, it's fighting so hard.
Needless to say, it's making manouvers almost an impossibility.
At the same time, warm starting is really bad, getting worse with a hotter engine.
When warm, it will start straight away and idle a little rough for a few seconds, then be ok.
When hot, it will fire immediately, then cut straight out, then need cranking for around 15-20 seconds (a long time on the starter when you think about it) then it will start to a horrible, lumpy, up and down idle for around a minute and it absolutely stinks of unburnt fuel.
Also, while cruising and coming off the throttle, the engine seems to surge slightly, almost like it's hunting back and forth repeatedly between 2 gears. It seems to do this toward the bottom of the rev range in each gear.
Fuel economy is a hilarious 11mpg too pottering around town, but not too bad on a run.
So, mine and James' first thought was a bad Lambda, so I've changed that for a nice Bosch number.
I've reset/adjusted the AMM to standard spec. (both with an ECU reset)
Idle valve is fairly new and Bosch if memory serves.
Does the same on regular or super unleaded. Not tried it on diesel just yet!
As far as I can tell, the car is mechanically sound.
One thing I have noticed is that the indicated engine temperature hovers around 73-75°c when cruising, but goes up fairly quickly to around 88°c when stationary for a couple of minutes.
When I turn the ignition on a moment after a hot shut off, it reads around 93°c, dropping quickly to around 88°c after starting.
I was thinking maybe my coolant temp sensor is a bit wonky??
I only thought of this because my fan has kicked in at an indicated 73°c before now! (my 2.0 Celebration doesn't until gone 90°c)
Perhaps that doesn't hold water though, because it would still start ok if it was reading at 90-odd degrees, as it wouldn't be trying to start on choke as was my train of thought.
Hmm...
Any ideas anyone??
Sorry for the long-assed post!!
Thanks,
Steve
you need to judge it correctly though otherwise I pulled up short and looked like a bit of a twerp
