Hi the other one ;-) Sure sounds rich, OK first please check out the basics (I am guessing you have but guessing gets me into trouble), air filter OK? Plugs and Leads OK?....just thinking you would have picked up a cylinder down but an intermittent misfire can (if its the sparks that are going) cause a rich mixture.
>From Memory Colin yours is a pre GEMS car? is that right?.....if so there was a problem that presents itself just as you explain, it was caused by wear in the distributor base plate pivot. When the vac advance starts to work the wear in the pivot allows the base plate to tip slightly and a misfire occurs, the simple and quick diagnostic for this is to pull off the Vac advance pipe from the distributor and see if the misfire goes, this is a very old problem from SD1 days and was there all through the years. Fix is a new base plate or recon dissy (of course irrelevant if yours is a GEMS car as it has no distributor. If it is a GEMS car then suspect the coil packs and leads, a known issue and someone like RPi in Norwich can supply a much better lead set and any LR/RR dealers a coil pack. If its not electrics I would then have a look at the fuel filter, when was it changed? Thing is though if its part blocked it causes a low fuel pressure and the system tries to adapt and eventually goes outside of the adaptive shift on the weak side not the rich, for rich you would look for an increase in line pressure so maybe a kink in the fuel return line or an air leak on the fuel regulator valve meaning its holding too much line pressure. In a garage I would check the fuel line pressure (any LR/RR dealer can do this and compare with the spec for a LR/RR)...after all that I guess your into air mass meter tests and Lambda values but your now deep into test kit. First things first, basics, basics, basics.....have you got reliable sparks to burn whats going in? what system do you have and lets go from there. BR Colin On 24 May 2012 08:42, Colin Mackay <[email protected]> wrote: > Hi Guys, especially the other Colin**** > > ** ** > > My +8 is running poorly with occasional stuttering when on acceleration > (even gentle) **** > > It seems to have a miss at higher revs (2500+), much more thirsty 24.5 vs > 29+ mpg as expected by the modest style of driving these miles. (My first > 200 miles was a gentle 60mph motorway trip which should have yielded 30+mpg) > **** > > Also the exhaust is black suggesting it is running rich and to make > matters worse is due for an MOT early next month.**** > > ** ** > > It stood for some months whilst waiting to be repaired and I thought that > it may have needed the chip re-trained so to speak, but after some 500+ > miles in the last week it is still not back to its former self. **** > > ** ** > > I realise there is little that can be done with injection systems but any > ideas would be appreciated!**** > > Something has to give!**** > > ** ** > > Colin Mackay**** > > View posts on The Mail Archive > http://www.mail-archive.com/[email protected]/ > Modify<https://www.listbox.com/member/?&;>Your Subscription > <http://www.listbox.com> > ------------------------------------------- View posts on The Mail Archive http://www.mail-archive.com/[email protected]/ [http://www.mail-archive.com/[email protected]/] Modify Your Subscription: https://www.listbox.com/member/?member_id=22459785&id_secret=22459785-4a39ddf8 Powered by Listbox: http://www.listbox.com
