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Ford Fiesta Ghia revving problem (Read 5865 times)
EscortMan
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Ford Fiesta Ghia revving problem
06.01.08 at 15:33:44
 
Hi all,  I must admit that I HAD noticed that my daughter's Ford Fiesta Ghia (R reg) had started to rev a lot on start-up and then settle down.  (Funny, I thought - a bit like a sticky automatic choke ??)   She's just called in and tells me that it is now revving whilst changing between gears.  Apparently it "only" gets to about 3000 RPM max, and the effect dissappears after about 20 minutes of driving.   I've now looked at the Haynes manual and realised that fuel injection systems don't HAVE automatic chokes !!!!!   Any ideas about how to persue this ?
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Nobster
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Re: Ford Fiesta Ghia revving problem
Reply #1 - 06.01.08 at 16:15:26
 
What's the engine 1.25 1.3 or 1.4? Undecided

Could be the TP sensor(Throttle Position) check it's not dirty or corroded.
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EscortMan
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Re: Ford Fiesta Ghia revving problem
Reply #2 - 06.01.08 at 16:19:01
 
Nobster wrote on 06.01.08 at 16:15:26:
What's the engine 1.25 1.3 or 1.4? Undecided

Could be the TP sensor(Throttle Position) check it's not dirty or corroded.


Oooops  !!!  (Forgot that little detail !!!) 1.25 Zetec
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muckymit
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Re: Ford Fiesta Ghia revving problem
Reply #3 - 06.01.08 at 16:19:29
 
vehicle speed sensor i think , to check unplug the triangular shaped plug at the nsr of bulkhead. Wink
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EscortMan
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Re: Ford Fiesta Ghia revving problem
Reply #4 - 06.01.08 at 16:20:59
 
muckymit wrote on 06.01.08 at 16:19:29:
vehicle speed sensor i think , to check unplug the triangular shaped plug at the nsr of bulkhead. Wink

Hi MuckyMits !  A happy new year to you !  What do I look for ?
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muckymit
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Re: Ford Fiesta Ghia revving problem
Reply #5 - 06.01.08 at 16:27:31
 
Quote:
muckymit wrote on 06.01.08 at 16:19:29:
vehicle speed sensor i think , to check unplug the triangular shaped plug at the nsr of bulkhead. Wink

Hi MuckyMits !  A happy new year to you !  What do I look for ?

happy new year matey  Wink, ok nsr of njin bay , you should find a triangular shaped plug ,unplug it , its meant to hold the rpms through gearchange but often stick,easiest thing to check mate ,unplug it ,run it and report back bud .
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EscortMan
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Re: Ford Fiesta Ghia revving problem
Reply #6 - 06.01.08 at 16:32:42
 
muckymit wrote on 06.01.08 at 16:27:31:
Quote:
muckymit wrote on 06.01.08 at 16:19:29:
vehicle speed sensor i think , to check unplug the triangular shaped plug at the nsr of bulkhead. Wink

Hi MuckyMits !  A happy new year to you !  What do I look for ?

happy new year matey  Wink, ok nsr of njin bay , you should find a triangular shaped plug ,unplug it , its meant to hold the rpms through gearchange but often stick,easiest thing to check mate ,unplug it ,run it and report back bud .


Don't have access to the vehicle at the moment, so can't do anything !  What should I expect when I unplug it ?  What goes wrong with this sensor then ?  Can it be rectified, or is it a replacement job ?
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Re: Ford Fiesta Ghia revving problem
Reply #7 - 06.01.08 at 16:38:15
 
Quote:
muckymit wrote on 06.01.08 at 16:27:31:
Quote:
muckymit wrote on 06.01.08 at 16:19:29:
vehicle speed sensor i think , to check unplug the triangular shaped plug at the nsr of bulkhead. Wink

Hi MuckyMits !  A happy new year to you !  What do I look for ?

happy new year matey  Wink, ok nsr of njin bay , you should find a triangular shaped plug ,unplug it , its meant to hold the rpms through gearchange but often stick,easiest thing to check mate ,unplug it ,run it and report back bud .


Don't have access to the vehicle at the moment, so can't do anything !  What should I expect when I unplug it ?  What goes wrong with this sensor then ?  Can it be rectified, or is it a replacement job ?

replacement usually, most people leave em unplugged  Roll Eyes the idle should return to normal, failing that i would go for iscv  Wink
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EscortMan
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Re: Ford Fiesta Ghia revving problem
Reply #8 - 06.01.08 at 16:44:18
 
muckymit wrote on 06.01.08 at 16:38:15:
Quote:
muckymit wrote on 06.01.08 at 16:27:31:
Quote:
muckymit wrote on 06.01.08 at 16:19:29:
vehicle speed sensor i think , to check unplug the triangular shaped plug at the nsr of bulkhead. Wink

Hi MuckyMits !  A happy new year to you !  What do I look for ?

happy new year matey  Wink, ok nsr of njin bay , you should find a triangular shaped plug ,unplug it , its meant to hold the rpms through gearchange but often stick,easiest thing to check mate ,unplug it ,run it and report back bud .


Don't have access to the vehicle at the moment, so can't do anything !  What should I expect when I unplug it ?  What goes wrong with this sensor then ?  Can it be rectified, or is it a replacement job ?

replacement usually, most people leave em unplugged  Roll Eyes the idle should return to normal, failing that i would go for iscv  Wink


O.K.  Thanks !
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EscortMan
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Re: Ford Fiesta Ghia revving problem
Reply #9 - 21.01.08 at 12:35:50
 
Hi all, Having got Christmas and New Year out of the way, plus a dose of 'flu, I have now managed to get hold of my daughter's car to try and sort this problem out !   Disconnected the flying lead to the VSS at the triangular plug, as previously suggested - still revs to 3000 RPM when cold.  Prodding the accelerator makes the revs rise a bit further but settles back to 3000 RPM.  Disconnected the idle air control valve - it was fully closed - I pushed a screwdriver agains the valve head and it moved inwards slightly (I assume that I was looking for the valve to be somewhat open when cold to give rise to the excess revving).  Both connector this connector and the VSS connector didn't show any signs of corrosion.  (The revving does remain whilst changing gear, but eventually does disappear after a few miles of driving).   So what do I look at next ?
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EscortMan
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Re: Ford Fiesta Ghia revving problem
Reply #10 - 22.01.08 at 08:48:29
 
Noticed last night whilst driving the car, that even after quite a bit of "warming up", if you let her free-wheel at speed and bring the revs up to 3000 'ish, it still "sticks" there.   It's as though the air valve in the throttle body is binding - but then why would it be so prevalent at start-up? (I'll check the throttle action anyway)  Anybody got any other ideas ?  Roll Eyes
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Re: Ford Fiesta Ghia revving problem
Reply #11 - 22.01.08 at 10:31:18
 
Quote:
Noticed last night whilst driving the car, that even after quite a bit of "warming up", if you let her free-wheel at speed and bring the revs up to 3000 'ish, it still "sticks" there.   It's as though the air valve in the throttle body is binding - but then why would it be so prevalent at start-up? (I'll check the throttle action anyway)  Anybody got any other ideas ?  Roll Eyes


When you say it stays there do you mean it won't drop down at all or it takes a couple of seconds to drop back down. I had a similar problem on my Focus with the revs hanging, I replaced my clutch pedal position switch and it cured it. Ford utilise a system to aid smoother gear changes that make the revs hang for a couple of seconds (so I've been told).
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EscortMan
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Re: Ford Fiesta Ghia revving problem
Reply #12 - 22.01.08 at 12:25:10
 
Southgate wrote on 22.01.08 at 10:31:18:
Quote:
Noticed last night whilst driving the car, that even after quite a bit of "warming up", if you let her free-wheel at speed and bring the revs up to 3000 'ish, it still "sticks" there.   It's as though the air valve in the throttle body is binding - but then why would it be so prevalent at start-up? (I'll check the throttle action anyway)  Anybody got any other ideas ?  Roll Eyes


When you say it stays there do you mean it won't drop down at all or it takes a couple of seconds to drop back down. I had a similar problem on my Focus with the revs hanging, I replaced my clutch pedal position switch and it cured it. Ford utilise a system to aid smoother gear changes that make the revs hang for a couple of seconds (so I've been told).


No, it won't drop down at all (certainly not within 15 secs - as long as I tried !)  Honestly, it makes me wonder how cars EVER operated in the past without all these Ford "goodies" to complicate life !!!  Grin Grin Grin
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chris123
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Re: Ford Fiesta Ghia revving problem
Reply #13 - 26.04.10 at 08:53:16
 
Hi

I have the same problem.
As going along, when in neutral, or as i bring the clutch down (only while moving) it will rev to between 2k and 3k revs.
When i break and am fully stopped moving it will sit back at idle.
Mine is a 1.25 Zetec (V reg)
It has been in the garage twice and he has replaced the speed sensor and then the air inlet valve i believe, but it is still doing it.

Only other bit of info is that it only started doing it straight after i picked it up from the garage last time (did it on the way home) when he had replaced the thermostat as the housing for that had been leaking!
Could these be linked?

Any help appreciated

Thanks
Chris
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Re: Ford Fiesta Ghia revving problem
Reply #14 - 26.04.10 at 11:49:44
 
chris123 wrote on 26.04.10 at 08:53:16:
Hi

I have the same problem.
As going along, when in neutral, or as i bring the clutch down (only while moving) it will rev to between 2k and 3k revs.
When i break and am fully stopped moving it will sit back at idle.
Mine is a 1.25 Zetec (V reg)
It has been in the garage twice and he has replaced the speed sensor and then the air inlet valve i believe, but it is still doing it.

Only other bit of info is that it only started doing it straight after i picked it up from the garage last time (did it on the way home) when he had replaced the thermostat as the housing for that had been leaking!
Could these be linked?

Any help appreciated

Thanks
Chris

I'd suggest the idle-control valve is sticking,  but these sympoms do suggest a VSS fault.

These cars are really bad for it, generally very reliable but when the revs start misbehaving,  they can be a complete nightmare. I doubt the thermostat housing is linked with your fault.

Regards,
Andy
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rhubarb
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Re: Ford Fiesta Ghia revving problem
Reply #15 - 26.04.10 at 11:50:31
 
Unplug the VSS and see if it behaves
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Re: Ford Fiesta Ghia revving problem
Reply #16 - 26.04.10 at 12:28:51
 
seen people faff for ages on this one and never cure properly as it can be a control unit fault Undecided
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EscortMan
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Re: Ford Fiesta Ghia revving problem
Reply #17 - 26.04.10 at 13:58:04
 
Hi Chris123
Sorry, I should have updated this thread with how the problem was eventually resolved (hold on to your Y-fronts, it's NOT good news !!).   I took the car to our local garage (I trust them implicitly !) for a scan, and they diagnosed a duff TPS.   I got a replacement from P***co which looked O.K.   However, the revving problem still occured.   Getting to the end of my wits, I took the car back to the garage - they soon told me that it was the wrong TPS, as the potentiometer worked backwards to that required (still don't understand that one !!  Cheesy Cheesy)   Anyway, they had the car for a full week and eventually called in a car electrician to look at the problem.   They did loads of work on it, but eventually took it to another place and had the ECU reprogrammed.   The bill at the end of all that was circa £550  Cheesy Cheesy Cheesy, but the fault WAS fixed and has been fine ever since. Wink  So, probably not the best news for you .........................  Roll Eyes
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Forkingabout
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Re: Ford Fiesta Ghia revving problem
Reply #18 - 26.04.10 at 14:06:02
 
Quote:
Hi Chris123
Sorry, I should have updated this thread with how the problem was eventually resolved (hold on to your Y-fronts, it's NOT good news !!).   I took the car to our local garage (I trust them implicitly !) for a scan, and they diagnosed a duff TPS.   I got a replacement from P***co which looked O.K.   However, the revving problem still occured.   Getting to the end of my wits, I took the car back to the garage - they soon told me that it was the wrong TPS, as the potentiometer worked backwards to that required (still don't understand that one !!  Cheesy Cheesy)   Anyway, they had the car for a full week and eventually called in a car electrician to look at the problem.   They did loads of work on it, but eventually took it to another place and had the ECU reprogrammed.   The bill at the end of all that was circa £550  Cheesy Cheesy Cheesy, but the fault WAS fixed and has been fine ever since. Wink  So, probably not the best news for you .........................  Roll Eyes


Pots can either start low & go high OR they start high & go low  Wink

Newer pots like fitted to the Reflex reach truck in the picture below are even more confusing  Grin

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Re: Ford Fiesta Ghia revving problem
Reply #19 - 26.04.10 at 18:23:11
 
Quote:
Hi Chris123
Sorry, I should have updated this thread with how the problem was eventually resolved (hold on to your Y-fronts, it's NOT good news !!).   I took the car to our local garage (I trust them implicitly !) for a scan, and they diagnosed a duff TPS.   I got a replacement from P***co which looked O.K.   However, the revving problem still occured.   Getting to the end of my wits, I took the car back to the garage - they soon told me that it was the wrong TPS, as the potentiometer worked backwards to that required (still don't understand that one !!  Cheesy Cheesy)   Anyway, they had the car for a full week and eventually called in a car electrician to look at the problem.   They did loads of work on it, but eventually took it to another place and had the ECU reprogrammed.   The bill at the end of all that was circa £550  Cheesy Cheesy Cheesy, but the fault WAS fixed and has been fine ever since. Wink  So, probably not the best news for you .........................  Roll Eyes

difficult one to diagnose unless carefull testing Roll Eyes
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