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Problem With Revs Dropping Off Them Going Back To Normal Every 5 To 6 Seconds

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#1 cardblower

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Posted 09 September 2012 - 01:49 PM

Hi All,

I have a 2001 Ford Focus 1.8 Zetec (petrol).

I'm new to this forum and have searched a great deal but only seem to turn up topics that refer to idle issues.

The idle is (usually) pretty stable at around 750-800, so I've not got an issue with that.

Also, I've checked the fault codes and there are none.

But, the car is using a lot of fuel and if you rev the engine (whether hot or cold) it revs well and then in a 5 to 6 second cycle will drop the revs by around 15% and sounds like its being staved, then revert to normal for 5 to 6 seconds, then then start this cycle again....

There does seem to be an audible "click" when this happens, so it's very odd.


The only thing that's been changed is a new clutch, I dont know whether it had the fault before as the car was my parents and I didn't drive it before the clutch change. they hadn't noticed the fault, but then they didn't drive it much - its only done 36K miles.

Would anybody have any ideas for this please, as I'm about to take it to a garage to get them to investigate, I just wanted to save some money and time if the knowledgeable folks on this forum had some ideas/pointers.

many thanks in advance.

Andy.

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#2 ChrisH

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Posted 09 September 2012 - 05:44 PM

When did it last have a really good service?

#3 cardblower

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Posted 09 September 2012 - 05:49 PM

When did it last have a really good service?


It's been serviced each year which is effectively every 3000 miles. I don't know what was involved in the service I'm afraid.
Could there be something that was missed?

Thanks for your reply.


#4 artscot79

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Posted 09 September 2012 - 07:20 PM

doesnt sound unusual for the mk1 if im honest due to the way it regulates emissions it sounds normal once the cars driving it should be fine its just reducing the idle emissions

#5 cardblower

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Posted 09 September 2012 - 07:32 PM

doesnt sound unusual for the mk1 if im honest due to the way it regulates emissions it sounds normal once the cars driving it should be fine its just reducing the idle emissions


Unfortunately it's very apparent when accelerating as well, it also is noticeable while cruising at 70 on the motorway.

I'm sure that's why fuel economy is around 200 miles per tank.


#6 artscot79

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Posted 10 September 2012 - 05:09 AM

diagnostics it will be could be anything from the coil pack to leads to plugs to pcv valve or hose to maf sensor to temp sensor

#7 cardblower

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Posted 10 September 2012 - 07:28 AM

diagnostics it will be could be anything from the coil pack to leads to plugs to pcv valve or hose to maf sensor to temp sensor


thanks mate, when you say "diagnostics" do you mean take it to a garage or dealer and get them to check?
As I mentioned, there's no error codes showing.

#8 artscot79

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Posted 10 September 2012 - 09:42 AM

yeah the dealer can test each sensor there may be codes stored in the car thats only accessible with a code reader

#9 cardblower

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Posted 10 September 2012 - 09:45 AM

yeah the dealer can test each sensor there may be codes stored in the car thats only accessible with a code reader


cheers mate, thats my next port of call then.


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