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Revs Hunting 2000-2500

hunting hunt revs 2000 2500 high fuel power loss

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#1 tigacatch

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Posted 26 January 2014 - 04:10 PM

In need of some help please

My ford focus 2003 1.6 zetec SE has developed a problem.
Started of last year in the winter when car suddenly woudnt start but after many atemps started eventually.
But ever since revs have been hunting between 2000-2500.
It also appears to have lost power in that band range.
Also fuel consumption higher too as this was confirm when the car was close to failing emissions test as it had high reading. I have since replaced throttlebody and idle control sensor.
Also the vacuum hose at the intake with a new one. Dont what to keep replacing stuff.
Thats why i need help

Btw idle is fine when cold or warm, the problem is band specific

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#2 ben1191

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Posted 26 January 2014 - 06:02 PM

Do you mean rev shunting lol?

#3 tigacatch

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Posted 26 January 2014 - 06:11 PM

Can't keep them steady between 2000-2500
Eratic

#4 jeebowhite

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Posted 27 January 2014 - 04:38 PM

Could be something as simple as a dirty MAF / MAP sensor, these will not be detecting the correct amount of airflow and as such will be instructing the ECU to fluctuate the fuel direction as appropriate.

 

Start by cleaning these with Electrical contact cleaner, check all hoses and pipes to ensure there are no breakages, slits, or leaks, and reset the car by disconnecting the battery (ensuring you have your radio code).

 

Then see if the issue comes back afterwards.



#5 tigacatch

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Posted 27 January 2014 - 07:21 PM

I will attempt doing this at the weekend but don't understand how the map sensor could be at fault as the car is fine at below 2000 and above 2500. Wouldn't this indicate that the map sensor works as intended ?

#6 jeebowhite

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Posted 28 January 2014 - 12:50 PM

MAP sensor could well be fine in that case, its just the airflow that needs to be queried.



#7 bt_cav

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Posted 28 January 2014 - 01:40 PM

Could be something as simple as a dirty MAF / MAP sensor, these will not be detecting the correct amount of airflow and as such will be instructing the ECU to fluctuate the fuel direction as appropriate.

 

Start by cleaning these with Electrical contact cleaner, check all hoses and pipes to ensure there are no breakages, slits, or leaks, and reset the car by disconnecting the battery (ensuring you have your radio code).

 

Then see if the issue comes back afterwards.

How long should the battery be disconnected for to reset the ecu? 

:-)



#8 jeebowhite

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Posted 28 January 2014 - 01:59 PM

20 minutes is often enough, anywhere between there and an hour...



#9 bt_cav

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Posted 28 January 2014 - 02:08 PM

Cheers James  :)



#10 tigacatch

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Posted 31 January 2014 - 05:45 PM

Hope this is not a daft question, located map sensor but how do I remove it. Any tips as it looks like I real tough on to get too. I think I see 2 screws but unsure. Any help welcome
Cheers

#11 slartibartfast

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Posted 31 January 2014 - 07:53 PM

Do you mean rev shunting lol?

surely hunting is the correct term to use? :rolleyes:



#12 jeebowhite

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Posted 06 February 2014 - 12:05 PM

I think its just an unscrew sensor isnt it?



#13 tigacatch

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Posted 06 February 2014 - 06:57 PM

Yes it will be a 4 wire sensor that unscrews. But I think with it being on exhaust I'll be having to heat it up a little to get it off.
Gonna attempt it on Saturday depending on weather lol = Scotland = rain pmsl

#14 tigacatch

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Posted 06 February 2014 - 07:03 PM

BTW is the post lambda sensor I think might be at fault !! Managed to get an obd2 thing and bank 1 sensor 1 graph goes up and down the way it should ( I think) but bank2 sensor 1 sitting at 1.2 volt constant !!! No flucuation at all. Can anyone confirm that this sensor (post cat) should read approx the same as bank 1 sensor 1 ??

#15 jeebowhite

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Posted 07 February 2014 - 02:28 PM

it could well be that the sensor is stuck or its shorted out. Might be worth disconnecting it and cleaning it up with electrical contact cleaner and seeing what it does after that.



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Also tagged with one or more of these keywords: hunting, hunt, revs, 2000, 2500, high fuel, power loss

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