Monday, June 11, 2007 - 07:37 am, by: James Brodie(Soarer987)
gidday
having some idle problems with my soarer.
i have pulled the idle air control valve off the motor and checked the bearings and they are fine and roll like new ones.
i bridged out the fuel pump by shorting b+ to fp on the diganostic port on the motor and then the car idled as it should.
so i then got a second hand fuel ecu and fitted that and then reset the computers in the car and for the first day it worked great.
then it played up again so i briged out the fuel pump and drove the car around for a couple days and now with the bridge in the idle is playing up.
when you first start the car it revs to about 2000 rpm for a min or so and then drops back to 1300 then straight up to 2000 again and will do this for as long as its left in neutral. put it in gear and its holding revs at about 1300 but the idle dose not flutuate.
this is driving me crazy trying to find out what is wrong with the car.
Monday, June 11, 2007 - 07:45 pm, by: Steven Farmer(Farmsci)
This sounds very similar to an ongoing problem with my Soarer, I found if I left the car in drive and left it to its own devices it would accellerate itself up to about 65kph with no throttle input and displayed all the same symptoms as yours. My car ended up spending two weeks with Neil and no solution could be found. The closest to a fix that was found was to put a clamp on the idle control valve hose to keep idle speed back in a sane region.
If you do find a solution please post it up because I had no luck whatsoever tracing the source of this problem, and we even went as far as to swap ecu's with another car and eveything!
Not much help I know but at least we know it isn't an isolated incident.
Monday, June 11, 2007 - 09:01 pm, by: Tim Pike(Keydecoder)
Steven Farmer wrote on Monday, June 11, 2007 - 07:45 pm:
The closest to a fix that was found was to put a clamp on the idle control valve hose to keep idle speed back in a sane region.
Haha, thats the same fix that Lew did to my car as well. Makes it a real pain to drive early in the morning or with the aircon on or when the air-suspension kicks in. I have to take back to Lew sometime (when I get time) so that hopefully it can get sorted out, probably need to take it to a auto-elec to get the temp sensors for the idle checked too, at least thats the current theory.
Andrew Ferres DieHard WA '86 Cressida V8, '84 Soarer V8, '90 C-F Celsior V8
Tuesday, June 12, 2007 - 03:36 pm, by: James Brodie(Soarer987)
i have not tried another ecu as i dont have one that i can put my hands on at the moment.
steven said that he and lew tried that on his car and still no luck.
could it be the coolent temp sender not reading properly??.
i have done the lew fix which is hose clamp the hose that goes to the idle air valve to restrict the flow of air to the valve to keep me going at the moment.
Andrew Ferres DieHard WA '86 Cressida V8, '84 Soarer V8, '90 C-F Celsior V8
Tuesday, June 12, 2007 - 07:02 pm, by: Andrew Ferres(Peewee)
If the coolant sensor was that far out of whack to cause 2000rpm idle, surely the ecu would throw a code?
If the TPS is registering an IDL contact, the ecu will cut fuel at ~2000rpm, and then cut back in about 1500rpm. This will keep cycling constantly. Normally this happens when the TPS is put back on incorrectly, and thus the throttle plate is jammed open.
If the throttle plate is fully closed, then all the air is going through the ISCV (which sounds like the issue), then I doubt its the TPS.
To me, this puts it either down to a faulty ecu, or a faulty ISCV. Try a different ISCV, then try a different ECU.
Sunday, August 26, 2007 - 09:33 am, by: James Brodie(Soarer987)
i am still fighting with this car and this problem. i have got my hands on another idle air control valve and fitted that and still no good.
i will try an ecu but i dont have one that i can borrow to try.
i have tried to put the car into diagnostic mode as there is a fault code coming on the dash "electrical system" but i cant get the car into the diagnostic mode.
Sunday, August 26, 2007 - 10:29 am, by: Rich O'neil(Kiwiinaus)
Seeing as you have tried everything else , how about having a look at the temp sensor , this tells the ECU what temp the engine is at and it does have an effect on the idle speed . Don't know for sure but know of two people who have swapped this unit and it has fixed the problem ?? Thing is it's not a difficult or expensive thing to do , I would certainly be checking that the resistance is within spec's .
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