Hi All, Ok a bit of an update.
I have reset the ecu by disconnecting the battery overnight and the as Jim said I let it to tickover until the fan kicked in. It appears to have made little difference. I took it for a spin yesterday when the engine was warm and the slight Hesitation past 7/8ths throttle was still present a bit like a mid range flat spot but at the top end. This morning I went out in the car and from cold the judder was still there. Once the car had warmed up I disconnected the MAF sensor and as Jim said it seem to make not a lot of difference. The only difference I could note was that after pulling up at the traffic lights and when I also pulled onto my driveway. The engine momentarily struggled to settle into a tickover i.e. the engine revs hunted very low, almost to stalling before settling down. Many Thanks Trevor On Aug 29, 6:06 pm, "Susan and Martin Scott" <[email protected]> wrote: > ISTR the fuel enritchment is via the temp sensor, so if the enrichment wasn't > happening due to poor/no signal reading could this be the cause? Over to JIm? > > > > ----- Original Message ----- > From: Critter > To: [email protected] > Sent: Wednesday, August 29, 2012 2:53 PM > Subject: [Quantum Owners] Hesitation on acceleration > > Hi All, > > I am experiencing a judder when accelerating away from cold on partial > throttle, including when the outside temperature is mild but the engine is > cold. This only last for approx 200 yds (M) If I floor the throttle the car > pulls away fine. I just look an idiot either pulling away from home like a > kangeroo or like a boy racer. > > When the car is warmed up, acceleration is great from partial to 7/8ths > open, but if I open up full throttle it feels like the engine is holding > back, but not miss firing. i.e. Hesitant. > > I have swopped the Idle control valve for a good spare and also the > throttle position sensor for the same. > > I was thinking of disconnecting the battery to reset the ECU but any other > suggestions? > > The car is a H4 with a RS1800 zetec all currently standard. > > It has done this for a few months now and I have bought fuel from various > garages so I don't think its fuel and as the cold fault disappears when its > warm I don't think its a loose connection. > > Any suggestions would be gratefully received. > > Kind regards > > Trevor > > -- > You received this message because you are subscribed to the Google Groups > "Quantum Owners Group" group. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected] > For more options, visit this group > athttp://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). > ------------------------------------------------------------------------------ > > No virus found in this message. > Checked by AVG -www.avg.com > Version: 10.0.1424 / Virus Database: 2437/5233 - Release Date: 08/29/12 -- You received this message because you are subscribed to the Google Groups "Quantum Owners Group" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] 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).
