Oh no - stepper motor problems again!!!
Discussion
Hi all,
I have a minor problem with the M12. It kinda reminds me of my TVR RV8 days when the stepper motor needed cleaning.....
The engine runs great when it's warm but occasionally when warming up or starting hot the idle speed has just started to drop down to 400 - 500 RPM and has actually stalled a couple of times.
As I said, it reminiscent of the old TVR stepper motor problem which needed a good clean every so often.
Is there an equivelent part on the FV6?
what else could cause this?
Could it be a blocked fuel filter?
Maybe it's because I put 95 RON in the tank by mistake the other day (although I'm told it should run on the cheap stuff)?
Any advice greatfully accepted.
Ta
Plipton
I have a minor problem with the M12. It kinda reminds me of my TVR RV8 days when the stepper motor needed cleaning.....
The engine runs great when it's warm but occasionally when warming up or starting hot the idle speed has just started to drop down to 400 - 500 RPM and has actually stalled a couple of times.
As I said, it reminiscent of the old TVR stepper motor problem which needed a good clean every so often.
Is there an equivelent part on the FV6?
what else could cause this?
Could it be a blocked fuel filter?
Maybe it's because I put 95 RON in the tank by mistake the other day (although I'm told it should run on the cheap stuff)?
Any advice greatfully accepted.
Ta
Plipton
Well, it happened again this evening
Luckily I caught it on camera. Sorry guys it's a 26 meg file so if you download it, it'll take up to 5 minutes on ADSL and forever on dial up. Best right click and save as....
As you can see, starting up when warm (stood an hour) it occasionally struggles to keep running. Then when I give it a few revs it clears itself after a few seconds and runs fine.
When the engine's warmed up it's not a problem, just starting up from cold or after standing for a while.
My thoughts so far..
Could it be the throttle position sensor? The fault seems to clear after it's revved. I've checked connections and they seem fine - I've also WD40d every electrical connection I could find.
Is the TPS a standard Ford part?
How does it work? Rheostat? on/off switch? something else?
Can someone try theirs to see how it works please (if a rheostat, what resistancees should it give at idle, just off idle, 1/2 and full throttle positions)?
The vacuum hoses all seem intact. If they weren't it'd be a more consistent problem I would think.
Could the engine be choked up? It's used in traffic mainly and rarely gets to rev much.
It started playing up after I washed it on Tuesday. I don't think I got any electricalbits wet, but the engine bay is semi open the the elements (and I use the car come rain or shine)
Any other thoughts? Anyone else had this problem or seen it and know the cure?
I'm sure it's something simple (and cheap I hope) to fix.
Cheers
Rick
>> Edited by plipton on Friday 26th May 20:19
Luckily I caught it on camera. Sorry guys it's a 26 meg file so if you download it, it'll take up to 5 minutes on ADSL and forever on dial up. Best right click and save as....
As you can see, starting up when warm (stood an hour) it occasionally struggles to keep running. Then when I give it a few revs it clears itself after a few seconds and runs fine.
When the engine's warmed up it's not a problem, just starting up from cold or after standing for a while.
My thoughts so far..
Could it be the throttle position sensor? The fault seems to clear after it's revved. I've checked connections and they seem fine - I've also WD40d every electrical connection I could find.
Is the TPS a standard Ford part?
How does it work? Rheostat? on/off switch? something else?
Can someone try theirs to see how it works please (if a rheostat, what resistancees should it give at idle, just off idle, 1/2 and full throttle positions)?
The vacuum hoses all seem intact. If they weren't it'd be a more consistent problem I would think.
Could the engine be choked up? It's used in traffic mainly and rarely gets to rev much.
It started playing up after I washed it on Tuesday. I don't think I got any electricalbits wet, but the engine bay is semi open the the elements (and I use the car come rain or shine)
Any other thoughts? Anyone else had this problem or seen it and know the cure?
I'm sure it's something simple (and cheap I hope) to fix.
Cheers
Rick
>> Edited by plipton on Friday 26th May 20:19
brav said:
Wow plipton - cant really tell, due to audio quality, but sounds like you have a lot of valve/lifter noise. You might want to check your oil level/pressure.
Hi Brav,
It sounds bad on the video as the audio is crap - tinny little microphone on my sony DSC. It seems to amplify the high pitched sounds. While I was recording it all I could hear was the exhaust.
Car was checked out by Vegantune only a few weeks ago. Oil etc are fine. Thanks for the feedback, though.
It's the hunting I'm more bothered by. Strange how it goes away when the engine's warm!
Ah, well thats good news then. I had a similar issue. Is your AC on when you are doing this? You can change the idle with a laptop and the noble software (at least we can in the states). Do you have a 3R? Maybe check air filters, fuel filters, etc.
My 3R never idled well. I had to turn it up to about 1100 or so. And even at that, sometimes its at 900, others at 1300. the TB does not have a separate idle adjustment, all done by computer. Maybe they can adjust the idle mixture.
My 3R never idled well. I had to turn it up to about 1100 or so. And even at that, sometimes its at 900, others at 1300. the TB does not have a separate idle adjustment, all done by computer. Maybe they can adjust the idle mixture.
AFAIK there is no stepper motor in the Noble throttle body assembly. An idle adjustment (increase) might help and can be tried very simply w/o using a laptop--all you have to do is ensure that the ECU is reset to the new setting by turning the ignition switch from off to fully on (no engine start) 10 times in succession. I have found that a 50 rpm change in idle speed can make a big difference in idle speed stability. Another potential fix is an ECU reflash, and Roush should be able to help with that.
JLSELAN said:
AFAIK there is no stepper motor in the Noble throttle body assembly.
I couldn't see one - it's just so similar to that fault i wondered if it could be related
JLSELAN said:
An idle adjustment (increase) might help and can be tried very simply w/o using a laptop--all you have to do is ensure that the ECU is reset to the new setting by turning the ignition switch from off to fully on (no engine start) 10 times in succession. I have found that a 50 rpm change in idle speed can make a big difference in idle speed stability.
I'll try that in the morning. Thanks
JLSELAN said:
Another potential fix is an ECU reflash, and Roush should be able to help with that.
I hope it's not required. Roush is over 200 miles and a 2 1/2 hour ferry crossing from here
Thanks for the ideas so far everyone
Rick - I had a similar though slightly more extreme issue when my car was just a few days old. When warm -couldn't hold revs and without throttle being applied. So when coming up to a R/bout, lift-off to change down and revs just dropped like a stone and stalled. Made it quite intresting going round a mini r/b with limited braking and no power-steering! Problem was faulty throttle control valve. Replaced and all was hunk-dory.
If you get no joy elsewhere and you can live without the car running for a few days, you could post the ECU to us for checking. No guarentees, though, as faults aren't stored on the ECU - they can only be checked on the car. It does sound like a sensor issue, though.
And as others have pointed out, the cars do not have a stepper motor.
YellowShed
And as others have pointed out, the cars do not have a stepper motor.
YellowShed
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