To those of you with mk3 ST petrols
Discussion
Ron240 said:
It does take quite a while for the gauge to move, so nothing to be concerned about. 
My journey to work is 8 miles with most of it being dual carriageway, and by the time I get there the gauge has only just started to move.
Slightly reassuring then! I thought my thermostat(s) were on their way out. For reasons unknown my mpg has taken a nosedive down to 25 and the car feels like it's holding back, especially on the overrun where instead of it rolling along quite nicely it now feels more like a diesel with an engine braking feeling. It's not bad but it's noticeable; the kind of feeling you get if your tyres are low on pressure or you're driving into a stiff headwind. It's in for service on Friday as it's 12 months since last oil and filters change. Heopfully that will fix.My journey to work is 8 miles with most of it being dual carriageway, and by the time I get there the gauge has only just started to move.
I'd say about 4-5 miles or 10-15 minutes to noticeably move and 7-8 miles or 20 mins to be fully up to temp. Obviously varies with outside temp - a nger at the moment. Is it not real then?
If any of the gauges weren't real I'd say it was coolant temp, which is straight up to the middle within a couple of minutes, where it then stays!
If any of the gauges weren't real I'd say it was coolant temp, which is straight up to the middle within a couple of minutes, where it then stays!
All that jazz said:
Slightly reassuring then! I thought my thermostat(s) were on their way out. For reasons unknown my mpg has taken a nosedive down to 25 and the car feels like it's holding back, especially on the overrun where instead of it rolling along quite nicely it now feels more like a diesel with an engine braking feeling. It's not bad but it's noticeable; the kind of feeling you get if your tyres are low on pressure or you're driving into a stiff headwind. It's in for service on Friday as it's 12 months since last oil and filters change. Heopfully that will fix.
Mine did this ford changed the inlet air temp sensor & that sorted it Cheers Neil, useful to know. It's in this Friday for oil, filter, air filter, plugs and new front pads so I'm crossing my fingers that it comes away 'fixed' although I have my doubts. It really does slow itself down when coming off the gas and my mpg has taken a real nosedive, currently sat at 24.8 which tells me there is an underlying issue as it's never been under 26.7 til now.
How did you discover that it was the air inlet sensor? Did you have EML on because main dealers usually send you away with "we can't replicate the fault" if there's no EML on. FTR my EML is not on.
How did you discover that it was the air inlet sensor? Did you have EML on because main dealers usually send you away with "we can't replicate the fault" if there's no EML on. FTR my EML is not on.
All that jazz said:
Cheers Neil, useful to know. It's in this Friday for oil, filter, air filter, plugs and new front pads so I'm crossing my fingers that it comes away 'fixed' although I have my doubts. It really does slow itself down when coming off the gas and my mpg has taken a real nosedive, currently sat at 24.8 which tells me there is an underlying issue as it's never been under 26.7 til now.
How did you discover that it was the air inlet sensor? Did you have EML on because main dealers usually send you away with "we can't replicate the fault" if there's no EML on. FTR my EML is not on.
My fuel consumption was also poor but I had an intermittent flat spot when accelerating tbh I didn't expect them to find anything as the fault was impossible to replicate but I mentioned it to the dealer when they replaced a faulty passenger mirror & when I picked it up they explained they had found the fault How did you discover that it was the air inlet sensor? Did you have EML on because main dealers usually send you away with "we can't replicate the fault" if there's no EML on. FTR my EML is not on.
There was no engine management light on but it was like a different car on the way home
No mention that the car was mapped either
neiljohnson said:
My fuel consumption was also poor but I had an intermittent flat spot when accelerating tbh I didn't expect them to find anything as the fault was impossible to replicate but I mentioned it to the dealer when they replaced a faulty passenger mirror & when I picked it up they explained they had found the fault
There was no engine management light on but it was like a different car on the way home
No mention that the car was mapped either
Nice. I read on a ford forum that you can tell if it's the intake air temp sensor by disconnecting it and driving it around for a bit. If it drives fine with it disconnected then (obviously) that's what it is so I'll definitely try that if the service and plugs don't fix the issue on Friday. There was no engine management light on but it was like a different car on the way home
No mention that the car was mapped either
k. Feels about 50hp down on power and have to mash the pedal to the floor to get it to shift whereas before pedal was really light and it went like a rocket.Hub said:
I'd say about 4-5 miles or 10-15 minutes to noticeably move and 7-8 miles or 20 mins to be fully up to temp. Obviously varies with outside temp - a nger at the moment. Is it not real then?
If any of the gauges weren't real I'd say it was coolant temp, which is straight up to the middle within a couple of minutes, where it then stays!
None of the gauges on the ST's give true readings. The gauges on the mk2 RS were the same. If any of the gauges weren't real I'd say it was coolant temp, which is straight up to the middle within a couple of minutes, where it then stays!
neiljohnson said:
All that jazz said:
Cheers Neil, useful to know. It's in this Friday for oil, filter, air filter, plugs and new front pads so I'm crossing my fingers that it comes away 'fixed' although I have my doubts. It really does slow itself down when coming off the gas and my mpg has taken a real nosedive, currently sat at 24.8 which tells me there is an underlying issue as it's never been under 26.7 til now.
How did you discover that it was the air inlet sensor? Did you have EML on because main dealers usually send you away with "we can't replicate the fault" if there's no EML on. FTR my EML is not on.
My fuel consumption was also poor but I had an intermittent flat spot when accelerating tbh I didn't expect them to find anything as the fault was impossible to replicate but I mentioned it to the dealer when they replaced a faulty passenger mirror & when I picked it up they explained they had found the fault How did you discover that it was the air inlet sensor? Did you have EML on because main dealers usually send you away with "we can't replicate the fault" if there's no EML on. FTR my EML is not on.
There was no engine management light on but it was like a different car on the way home
No mention that the car was mapped either
.All that jazz said:
Which is the inlet air temp sensor on the mk3 Focus ST? There doesn't seem to be one. The only sensor on the inlet piping is the MAF. Is it that you mean? I have disconnected mine now and initially it felt a little bit more perky but I think it was just placebo effect as it's still rather laggy and hesitant. My mechanic now thinks it could be the boost control solenoid as I'm having some rather sporadic readings on the boost dial when WOT (this was before MAF was d/c). My mpg is now down at 21mpg .
Being that I'm in the trade I'm ashamed to say I have no idea as I just haven't looked .
It is quite possible it is incorporated into the maf sensor though
Seems your ford dealer are not as efficient as mine
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