Posted by bille on September 17, 2009, 6:09 pm, in reply to "Re: Over fueling what to do????"
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Well, Vehicle has done 120klm and fair bit of stop start in traffic and problem hasn't raised it's ugly head so it looking good that it might just have been a earth problem...but I'd like to know for sure --Previous Message-- : Patrick thanks for that, I had another look at : it this morning and tried to find a ID : number on the coil, but to get it out of the : bracket I had to unbolt it and noticed there : is a heavy earth strap using the one of the : bolts, I cleaned that up (Was pretty clean : anyway)and tightened the bolts again, drove : about 2 klm until it warmed up then left it : idling in the drive for 1.5 hours and it : seems like it's back to it's old self and : drives fine. : : Not sure if that is the "Final : fix" for this particular problem but I : guess the next day or so will tell. : : --Previous Message-- : Hi Bille. : Fast idle can be caused by a number of : things, I have had the problem occure on a : number of occasions, I would suggest you : start with checking all your vaccum hoses : paying particular attention to the small : hose connecting to the the idle control : "air by-pass valve" at the rear of : the plenum chamber. It would be a good idea : with a vehicle of your age to replace all of : them, then check to see if the problem still : exists, this is a cheap way of eliminating a : potential fast idle problem. Next I would : check the idle or "air by-pass : valve" coil wiring for correct : continunity. Then the "temp : sensor". Then the "throttle : potentiometer" (throttle position : sensor mounted on housing). Then the : "road speed transducer" mounted on : the chassic rail under the front passenger : seat near the transmission. Then "the : distributor module". and finally the : "airflow meter" as this is the : most expensive of items listed to replace. : Hope this helps. : Regards:- Patrick M. : : --Previous Message-- : ’93 Rangie, V8 auto EFI located in Perth WA. : : In the past few weeks sometimes it idles a : bit fast after the engine has reached : operating temperature about 1100rpm but not : always usually about 750 to 800rpm. : : Sometimes it will take me somewhere and it’s : fine but when I try to start it, it acts : like it has a gut full of fuel and is pretty : hard to start unless left to cool down for : 15 minutes, then it will start with the : throttle wide open but still idles fast when : the throttle is backed off, next day it : starts fine idles fine. : : Acts bit like a carburetor engine with the : choke on and only appears to happen when it : is doing the fast idle thing. : : I’m not a mechanic but I’m thinking it is : something to do with the engine temp : sensor/s not sure which ones but probably : the one that tell the ECU that the engine : has warmed up and less fuel is required. : : Can anyone confirm that I’m on the right : track and if so point me toward the : offending sensor…I notice there are several : sensors screwed into the engine at the top : just forward of centre of the engine. : : Thanks for reading and thanks in advance for : any help offered. : Edit/Delete Message : : : : :