Posted by Bille on October 12, 2009, 11:35 am, in reply to "Re: Over fueling what to do????"
124.169.102.168

OK vehicle has now done 400K, problem hasn't raised it's head again and local ambient temperature has been up for a lot of the time so I can probably assume it was the Temperature sensor telling the ECU the motor was still cold. Now that's out the way I'm going to do new plugs, leads etc.etc. Thanks again for the interest and suggestions. --Previous Message-- : UPDATE roblem returned last Saturday after 9 : days Bugger!!! : : Over long weekend in Perth I checked all : vacuum hoses (All good),plus I cleaned up : anything else that looked like it could be a : problem, one of my sons called in while I : was scratching my head and thinking whether : I should relocate the ignition module away : from the dizzy or just replace it as it was : before and whether I really had a choice : because the parts dealers were shut until : Tuesday anyway. : : We started it up to get it warm to the point : it would fail, he got the hose and trickled : a bit of cold water onto the block where the : Temperature sensor screws into the block : (The vertical one) and it seemed to correct : the problem. : : I replaced both the sensors, the horizontal : one as well ($55 for the two) but not at the : same time, I did the horizontal one first : then tested it (Made no difference) then : replaced the vertical one, seems to be : running much better and not cutting out and : judging by the fumes at the rear of the : vehicle to be running much leaner than : before and the engine isn't 'hunting' now. : : After the problem came back last Saturday : after 9 days of thinking it was solved I'm a : bit wary of saying it's solved this time but : I hope this is the last of it, I will post : an update in a 100klm or so for those : interested. : : Thanks to all for the interest and : suggestions to date. : : Bill : : --Previous Message-- : OOps, did I forget to mention earth : connections? : Good on you Bille. : Regards:- : Patrick M. : : --Previous Message-- : 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 : : : : : : : : : : :