Granted, the PSS will only help the original idle, bringing it down by 100rpm to improve that.
I'm wondering if there is wear on the TPS tracks, but I would expect that to be a problem with and without the ISCV connected, which points at the ISCV, but we're still not running as we should with that disconnected. I don't believe the throttle stop was adjusted, but as we're a slight hybrid might this need adjusting? Having googled for an image of the OBD2 connector I can confirm that's the one on the loom. Regards, Steve -- www.h4-turbo.co.uk www.quantumowners.co.uk www.quantumcars.co.uk www.quantumheritage.co.uk On Tuesday 01 Jun 2010, Jim Hearne wrote: > The power steering switch makes a very small difference to the RPM, it > won't be causing your problem, or the road speed sensor, it doesn't make > that much difference. > > The throttle pot maybe. > > The reason i asked about the throttle stop is when my Mondeo was messing > about at idle because it had fast road cams in it, i tried increasing > the idle speed by adjusting the throttle stop on the throttle body > (which everything warns you not to do). > The effect i got then was a faster idle when you started it but as soon > as you pressed the throttle the idle jumped up to 2000 rpm and stayed > there, if you pressed the throttle again is jumped up to 2500 rpm. > The ecu was obviously getting very confused. > So i put it back where it was. > > Has the loom got the OBD2 diagnostics connector ? > > Jim > > On 01/06/2010 13:33, Steve Kodz wrote: > > We can check the other faults, but reading the links Gary sent sound > > promising too. > > > > The talk about the power steering switch needing to be a closed circuit > > is useful as that'll drop the revs by 100rpm. The most likely source > > could be the Throttle Position Sensor (TPS) as this has caused similar > > faults on these forums, but it doesn't explain why disconnecting the > > ISCV improves things. > > > > Geoff will also have to make sure that the vehicle speed sensor has > > clean contacts. > > > > How do you read faults on these ECUs, as they have a large connector > > that is the interface and I assume that's where you get the fault code > > from. > > > > Regards, > > Steve > > -- > > www.h4-turbo.co.uk > > www.quantumowners.co.uk > > www.quantumcars.co.uk > > www.quantumheritage.co.uk > > > > On Tuesday 01 Jun 2010, Jim Hearne wrote: > >> Sorry, have you checked for fault codes ? > >> > >> Jim > >> > >> On 01/06/2010 12:29, Steve Kodz wrote: > >>> We're getting a very bad idle with the Zetec in Carole's 2+2. With > >>> the idle speed control valve connected from cold it will idle nicely > >>> at around 1000rpm, if just left to idle and warm through. However > >>> if you rev, or drive that car the best idle to can get is between > >>> 2-3,000 rpm, which isn't great :( The car also drives badly, having > >>> hesitation and then you fight the engine on the over run. > >>> > >>> It is a lot better with the ISCV disconnected, but still not great. > >>> The idle is still a bit high, being around 1,200 rpm and it still > >>> doesn't drive that great. > >>> > >>> We've tried resetting the ECU to re-program it and Geoff's cleaned > >>> all the electrical contact and the ISCV. Any ideas what else needs > >>> to be done to get this ready before the HHII? > >>> > >>> Regards, > >>> Steve > >>> -- > >>> www.h4-turbo.co.uk > >>> www.quantumowners.co.uk > >>> www.quantumcars.co.uk > >>> www.quantumheritage.co.uk -- You received this message because you are subscribed to the Google Groups "Quantum Owners Group" group. To post to this group, send email to quantumowners@googlegroups.com To unsubscribe from this group, send email to quantumowners-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/quantumowners?hl=en IMPORTANT NOTE: All information presented herewith is provided on an "As Is" basis, without warranty or the implication thereof. Neither the Quantum Owners Club nor the individuals associated with the Quantum Owners Club or in the preparation of the above information shall have any liability to any person or entity with respect to liability, loss, or damage caused or alleged to be caused directly or indirectly by the instructions contained within this or related message(s).
