S2 C34 Stagea That's Hard To Start

[QWK32]

Hugh, just a couple of thoughts. what is the TPS voltage with the throttle closed? And at fully open? When you apply the throttle is it a linear increase in voltage from the TPS? you can check this with a multimeter or through a consult interface.

Also check the throttle open/close switch. It is the second plug off the TPS. It's either voltage on or off, depending on if the accellerator is pressed or not. This is the one I'd say is more lickly to give you idle problems, i think the ecu uses it to know when to use minimum theoretical injector pulsewidths, which roughly means at idle atleast X amount of fuel must be used. If this switch isn't switching to let the ecu know when no throttle is being used, it will assume you are using the accellerator, therfore ignoring the minimum limits and use the AFM load, which will be very low at 600rpm, to govern the fuel used. This will also explain why giving it a boot helps get it going.

You can also check ths with a multimeter or sone consult interfaces will show it.

Edited February 5, 2010 by QWK32

[ssshonky]

air filter is clean yeh?

[Stinky Rooster]

Timing has always been crap. CAS is current in 'stock' position, timing gun and diag computer say idel is 0 deg. make sense of that !?

timing belt lines up with gear markings.

Woah

back up a bit. What do you mean when you say timing is 0 deg at idle? Are you looking at static timing or advance? Because at static timing (idle) you should have about 12-15 deg, and then advance should be pulling about 10-12 deg in after that.

If it was an old distributor engine you could set the timing up (via the balancer marks) and then ratchet the dizzy about with a multimeter attached to the coil until you can pick up the primary field collapsing. Its not perfect, but it is usually enough to get it idling and you can put the timing light on it. Now, any consult guru's out there know how we can try the same thing on an Neo RB?

Another thing that will complicate this is the Neo's "constant" variable valve timing. You will need to make sure any timing adjustment is done with the VVT module disconnected. (When doing the timing on an S1 you can just keep it under 4500rpm, and as full advance is gained by about 3000rpm usually its not an issue)

Also, the marks on the belt are for cam timing, not ignition timing. While cam timing (when variable) has an effect on ignition timing, its not the same thing.

[Mr GTS4]

maybe it's still stuck in the closet if you know what i mean... lol

[Whooby]

Here's another issue to add to the list.

Had to drive around some dickheads which then decidied they wanted to turn left from the RIGHT lane meaning i had to brake quickly and downshifting at the same time to pull the car up. Went to go again and there was nothing. The damn thing had stalled!!!! I've noticed the last week or so when sitting at lights waiting to go the rev's seem to be a little low. If i move it to N and then back to D the revs go back to where they should be or if i accelerate a lil to creep fowards and stop the revs are fine again.

So the question is:- TPS getting closer to dying???

Hugh.