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        General >> Problems >> Throttle Problem
        
(Message started by: Octavian_P on May 29th, 2005, 2:52pm)
Title: Throttle Problem
Post by Octavian_P on May 29th, 2005, 2:52pm
First i want to say hello to everyone,
it's been a while with none of my posts  ;D

I need advice on a thing. I have a throttle delay, if i push the accelerator quick, the engine tends to stop for a moment then revs normaly. Under load when i accelerate quick and keep constant throttle the engine revs after a while to speed, and sometimes it doesn't rev constantly.

I have cleaned the MAF, and Throttle body today and gave it another try. In the first 20 - 30 seconds it worked perfectly, no delay, no unusual reving. After that period it retuned to it's previous state.

Despide all of this the engine has power, and pulls nicely, if i don't give it to much acceleration at once.

The car is a 96 2.3L 16 V DOHC engine with Manual gearbox.
Title: Re: Throttle Problem
Post by scorpio_man on May 29th, 2005, 5:19pm
hi there

you can check the throttle sensor with a volt meter. set it for 5 volts. it should be a smooth track. i can't remember if the voltage goes up or down, though.

another thing to do is clean the throttle body. see http://www.btinternet.com/~madmole/HowDoI/Howdoi.html#Modify%20the%20Throttle%20Body
you don't need to do everything, though. i just opened the throttle butterfly and cleaned with carb cleaner and a rag.

hth
Title: Re: Throttle Problem
Post by Octavian_P on May 29th, 2005, 8:52pm

on 05/29/05 at 17:19:16, scorpio_man wrote:
check the throttle sensor with a volt meter. set it for 5 volts. it should be a smooth track. i can't remember if the voltage goes up or down, though.

another thing to do is clean the throttle body

hth


The throttle position sensor has 3 wires ??? where should i maesure betwen them. I have cleaned the throttle body.

The amazing thing is that it worked for 30 seconds, which before it didn't.

cheers
Title: Re: Throttle Problem
Post by scorpio_man on May 29th, 2005, 9:07pm
hi there

not really sure. :-/ the white and  the yellow? just push the probes into the back of the multi-plug until you find the right combination. remember to have the ignition on and the meter set to 5 volts. then as you open and close the throttle the volts will rise/fall smoothly. if not then the tps is at fault.

hth
Title: Re: Throttle Problem
Post by Octavian_P on Jun 2nd, 2005, 6:44am
The volts will rise fall smoothly, now everey time the engine is cold it works great (30-40 seconds), after that problem re-apears. Any other ideeas
Title: Re: Throttle Problem
Post by scorpio_man on Jun 2nd, 2005, 7:05am
hi there

one of the temp sensors? see http://www.fordscorpio.co.uk/ho2smonitor.htm
Title: Re: Throttle Problem
Post by Octavian_P on Jun 4th, 2005, 11:04am
I haven't had time to measure the temp sensor & lambda's but searching for wires (looking for troble  ;)) i found that the thin hose of the top of the EGR valve was broken, may this brought me the problem ??? i haven't fixed a new one yet.
Title: Re: Throttle Problem
Post by dart on Jun 4th, 2005, 9:33pm
Been reading this with intrest!
      Just cleaned engine compartment today and found the broken brittle plastic pipe to the ERG! Iv'e had a simlar problem with the reving and lag, but mines only a 2.0l 8v so it may not be effected to a greater extent as yours.what you reckon Scorps? :)
Title: Re: Throttle Problem
Post by Octavian_P on Jun 5th, 2005, 12:45pm
Had "tunned" my scorp with a cooper pipe (like the one from the brakes) instead of the plastic one, same problem, to be honest i don't know eaven if it does someting, althrough at higher revs it's a slight improve (maybe my imagination), but same long delay. In this morning (engine cold) i have tested the new "pipe-work", for 20-30 second i was a happy man, no delay, after that old habbit returned.  >:(
Title: Re: Throttle Problem
Post by Octavian_P on Jun 27th, 2005, 9:02pm
Hello to all !

Long time has passed and still no fix for my delay. Trying to find a fault. I turned on the engine and as i was reving in short shots i heard a strage noise. It sounds as like air is sucked in the trotle body from outside. I have checked the intake system once agin, no leaks. If i put the hand on the intake pipe it generates a great vacuum and the hose that conects the air filter to the throttle body shrinks. So what could produce that noise. Also i mention that the noise happens exactly at hard acceleration....when the engine dies. Another thing i tryied, is to remove the thin pipe from the egr and try to cover it with a finger, but it seams that there's no vacuum. Checked agin all the hoses and the DPFE ( as i remeber to be named)....no aparenty leaks. Can anyoane give me another ideea to try something elese.

Thanks
Title: Re: Throttle Problem
Post by martin_rowe on Jun 28th, 2005, 8:41am
how have you checked for leaks ?, try squirting carb cleaner or cold start around the inlet manifold with the engine idling, you will hear a rust of air on throttle snap from idle, the noise you here when the engine dies is perhaps the ICV opening to try & maintain engine speed, has the 2.3 got a MAP sensor, oil in pipe ect ??
Title: Re: Throttle Problem
Post by Octavian_P on Jun 28th, 2005, 7:45pm
The ICV beside of keeping the engine at iddle speed does it have another role like acceleration pump. Or does the scorp has someting like this, maybe it doesn't supply enough fuel. But this still does not explain  the behavior at cold, when it runs fine ( for about 30 seconds ).
Title: Re: Throttle Problem
Post by scorpio_man on Jun 29th, 2005, 5:55am
hi there

when cold, the engine runs 'open loop'. after 180 seconds it then starts using all it's sensors for fueling.

have you checked the lambda sensor voltage yet? 0-1 volt.

hard to tell what's happening without an obd-2 scan :-/
http://www.fordscorpio.co.uk/fuelreg.htm
Title: Re: Throttle Problem
Post by Octavian_P on Jun 29th, 2005, 11:01am
I hope that in this week end i'll have time to measure the lambdas.


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