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HUGE idle problem -Problem resolved, thanks to all! 

 

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 Post subject: HUGE idle problem -Problem resolved, thanks to all!
Posted: Tue Dec 18, 2007 4:24 pm 
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Hey everyone, (on my late model EL) yesterday after a car wash (no engine wash) i was waiting at an intersection, waited for a good 30seconds, i revved my engine to around 3k, after which the engine started to slow down to 1k (idle) where i then stuck my foot on the clutch and the brake, after 1 second at the engine revving 1k, it launched upto 2k, i looked down in dismay to find neither of my feet touching the accelerator.

So now when i am driving the car doesnt back off properly, it sits on 2k for ten seconds or more and this is going to be a huge problem starting the car if it is going to rev upto 2k 5 seconds before the oil can circulate.

Also, even at cruising speeds, the fuel usuage (indicated by the odometer / mechanics diagnotistic menu) has risen from 4-6L's per hundred, to a staggering 18-25L'2 per hundred.

Travelling at 100kmph indicates 22-26L per hundred.
Which usually sits between 7 and 11L.

Water is the concern here, in weeks past i have washed the engine bay, to find for the next few hundred km's for it to run rough, that is you will accelerate and find it 'blips' from acceleration to nothing then back again.

Hopefully its just a solenoid or someting cheap and easy.
-Ive checked the airbox (modded to suck air in from the front) no water apparent.
The spark plug gaps are HUGE, but this has been the case for 2/3 weeks now.

FIX HERE: The problem was found at the map sensor, the pipe returning into the runners was lose at the runners end.

THanks again
Matt

 

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Last edited by -GAS-MAN- on Sat Dec 22, 2007 2:44 pm, edited 4 times in total.

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Posted: Tue Dec 18, 2007 4:48 pm 
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throttle body open? idle sensor knocked when u sprayed water?

 

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Posted: Tue Dec 18, 2007 5:34 pm 
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Actually, a week ago when i modded the airtake, which worked a treat mind you, no lag at all and it gets great mid / high revs - Apart from this, i opened the throttlebody and cleaned it with some degreaser, also when i went to start it, it backfired slightly, like a 'fluff' not a 'BANG.

REPORT: The throttlebody is fine :(

Anyway, does anyone else know what else might have caused this.

Thanks again
Matt

 

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Posted: Tue Dec 18, 2007 8:09 pm 
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did u play with the idle control?

 

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Posted: Tue Dec 18, 2007 10:56 pm 
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what sort of car are we talking about??
personally id be checking for vvacuum leaks, sounds like a pretty big one to me.. and abnormal sucking sounds around the inlet manifold?
MAP sensor hose? brake booster hose? PCV maybe?

mitch

 

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Posted: Wed Dec 19, 2007 12:27 pm 
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This is on a late model EL.
Idle control: Nah i hadn't touched it, i did yesterday though, its using massive amounts of fuel, on the 'instant fuel usuage' part of the gauge, its showing 98!!
Ill check for vacuum leaks, thanks!

 

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Posted: Wed Dec 19, 2007 7:07 pm 
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Whats the little black sensor thing on the firewall near the windscreen washer bottle?? At work we replaced it on an NA Fairlane that wouldnt idle & also on an EF Falcon that had idling issues. Might be worth a look...

 

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Posted: Wed Dec 19, 2007 7:35 pm 
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Thats the map sensor,

his pipe gets upset when theres a backfire :)

 

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Posted: Wed Dec 19, 2007 8:14 pm 
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reset the computer, change the map sensor and make sure there is no water sitting in the bay

 

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Posted: Wed Dec 19, 2007 9:55 pm 
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the same thing happend with my ute with the revs.
did it a few times revving to 2k and holding it there for about a minute.
had a service a week later and they changed the stepper motor, didn't do it again. my old ea did it my mum once holding the revs alot higher, same fix
not saying it's the cause but maybe
ben
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Posted: Wed Dec 19, 2007 10:41 pm 
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my EF has done it once or twice on a startup. i just grabbed the clutch a tad to bring the revs down and it was fine from then on.

 

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Posted: Wed Dec 19, 2007 10:51 pm 
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Great guys, thanks alot, you guys rock!
Can anyone give me an idea of what a map sensor would cost and where it is located?

Ive got a gregories guide, but its at home and i am at the missus's!

But seriously thanks again!
Matt

 

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Posted: Wed Dec 19, 2007 10:53 pm 
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i think i might have a spare.. ill have a look for ya, im sure i can send it to ya for like 3 bucks (postage cost)

 

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Posted: Thu Dec 20, 2007 3:35 am 
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-GAS-MAN- wrote:
Great guys, thanks alot, you guys rock!
Can anyone give me an idea of what a map sensor would cost and where it is located?

Ive got a gregories guide, but its at home and i am at the missus's!

But seriously thanks again!
Matt


ah, i thought it was the map sen too, till i tried that + 25 other things. it might be that, but be prepared to hunt around for the fix to it for a while.

type in MAP in to the search here and there'll be a pic in a previous thread

 

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Posted: Thu Dec 20, 2007 10:08 pm 
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Thanks guys, much appreciated !

 

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or you can be fast and reliable,but it wont be cheap

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