Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: ffcgary1 on 22 March 2015, 18:07:27
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As per title no idle on 2.5 v6 after a dis pack change, have had the plenum off twice now and checked for air leaks and split vac pipes, found no splits or air leaks.
I have also removed the intake manifold and cleaned everything to within an inch of life and checked all seals and refitted all very carefully.
Car runs and idles lovely untill warm at which point it then hunts and eventually dies.
Car starts first time every time but refuses to idle.
VERY CONFUSED. :-\
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Fast idle "choke" not cancelling? Temp sensors working or disturbed?
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Idle contol valve properly plugged in?
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Temp sensors both plugged in and secure, idle control valve a bit loose in the rubber plug but appears not to be leaking. swapped icv for a substitute same symptoms.
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Chris what is the fast idle choke? havent heard that term before. ::)
Gasket to the egr vave/plenum replaced as well.
breathers cleaned and new breather box seals fitted.
Throttle body cleaned and seals replaced.
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Will it run with minimal throttle? (To replace the idle function)
Throttle position sensor plugged in?
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When mine did this, it was the MAF. Checking is easy, disconnect the MAF and see if the problem improves. It will put the MIL on, but that resets as soon as everything is reconnected.
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Will run with slight throttle
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Chris what is the fast idle choke? havent heard that term before. ::)
When cold it ticks over a bit faster. Should settle to 550 rpm once warm. But if the ecu still thinks the engine is cold, due to missing sensor info, it might still run rich and bog down.
That was my thinking anyway. Not saying my thinking is correct mind.
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Maf disconnected and will not idle at all. so no change.
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Paper clip test for codes :)
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I've read that guide several times and have tried it as well, but the readings i get mean jack according to the code lists on here. ;D dont worry the guide is fine its the operator.
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will get codes somehow and post up.
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My 3l did this after a cam gasket change.It'd start and run for a few minutes or if revs were kept up it'd keep running but try to let it idle and it'd die.Then you coul start it straight back up again and same would happen.Turned out that when the guy had done the gasket change he'd not quite pushed the connector home for the crank sensor at back of head.Just saying like!
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I did check all the plugs at the back when the intake manifold was off, found nothing disconnected plus i would have thought that if the cs was unplugged it would not start.?
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When you looked at plug on mine it seemed right but although put together the two halves hadn't been pushed fully home,so I suppose giving a weak connection.Once properly "clicked" together I had no further problems until cs packed in altogether some months later
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Excuse me for suggesting that there might be an elephant in the room, but is the fuel light on?
Just asking, like ;)
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full tank of fuel AL. Runs loverly until idle speed. revs cleanly and no miss fire. on the road drives fine but wont idle.
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So this paper clip test.... ? :)
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How is your 4 bar pressure regulator plumbed in?
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Cam shaft sensor ?
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sjc the pressure regulator is a direct replacment of the original in the factory fit location.
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woolley, do they ever fail?
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Now and then ;D
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UPDATE,
Well after reading the codes via a paperclip test and failing to show any codes it finally got plugged into a tech 2 at my buddys dealership, again no codes stored and nothing showing of any concern on the live data whilst the engine was running with the aid of a little throttle. Plenun removed again and intake removed to check again for any spilit pipes and hoses including the brake servo pipe, all good. Replaced the icv valve rubber holder and plenum seal as i had bought it to replace a sloppy fit but no change in symptoms, wont idle when hot.
So decided to change the crank sensor with a new gen vx part fron vx, fitted said part and the car is now cured, idle rock solid for over an hour, so happy that it was the CS.
Seems i have found a new symptom of failing CS to add to the others that are known about.
VERY happy bunny.
Gary.
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:y
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And never never ever any code for the failed CS
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It is amazing how many strange symptoms are cured by a CS change on the V6's. Almost worth changing these first to eliminate! :-\ :-\ :-\