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Mk1.5 Focus Will Not Rev When Warm


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#16 Blackie_No1

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Posted 11 December 2013 - 06:10 AM

Oh, just thought, sometimes when trying to get the car to rev there would be the odd backfire, could this happen with a blocked exhaust?

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#17 mick85

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Posted 11 December 2013 - 08:14 AM

Yes definitely I think Wase right say ur cat stuffed an backfire dead give away ouch not cheap fix

#18 Blackie_No1

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Posted 11 December 2013 - 09:52 AM

The only thing that bugs me about this theory is if it was blocked to that extent, why would it still tick over at normal idle speed? Surely if the engine was being choked that much it would die altogether?

#19 Blackie_No1

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Posted 11 December 2013 - 10:18 AM

This is her on tick over at cold:





#20 Blackie_No1

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Posted 11 December 2013 - 10:25 AM

Just checked the vacuum hose from the manifold to under the coil pack and yes it is closed over, but opens under throttle

#21 mick85

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Posted 11 December 2013 - 11:17 AM

We'll u did say at times it can cut out so it not completely blocked but more u drive it will just keep gettin worse like has it just been gettin worse over last few months

#22 jeebowhite

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Posted 11 December 2013 - 11:53 AM

Like anything, the less work the easier it is!

 

So when you sit at idle, the car is ticking over, no real pressure going in or out, just enough to keep it ticking. Then as you run the car, the more revs, the more work the car does, the more work, the more pressure of combustion and exhaust gasses going out. Your then creating a bottle neck effect!

 

Imagine this. You get on a bus, everyone casually walks on or off as they see fit. No pressure, everyone moves, no bottle neck. now, set one of the seats on fire. All of a sudden you have increased the pressure, everyone is running to the door trying to get off the bus before you all cook. All of a sudden there is a bottleneck and no one can get out.

 

This is pretty much whats happening it seems!



#23 wase16ll

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Posted 11 December 2013 - 12:23 PM

Easy to test for
All you need to do is remove the front sensor, keep the electrics connected and tie it up out of harm's way...
Way I would do it, is loosen the sensor then just nip it back up...take for run till symptoms develop, when still hot taking the necessary precautions, remove the sensor but keep it plugged in, tie it out the way and run again, if power returns you have a blocked exhaust.

Be warned though, doing this makes exhaust a tad noisy :)

#24 Blackie_No1

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Posted 11 December 2013 - 01:58 PM

Just back from my local mechanics who plugged I his snap on diagnostic computer and it was the no1 o2 sensor :)

#25 wase16ll

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Posted 11 December 2013 - 02:43 PM

very unusual symptoms of just a bad 02 srensor (though suggestion earlier you found split in vacuum hose too, so the combined might give something like your experiencing)

 

be interested to know if this has cured all the problems, not easy diagnosing over www, can only be suggestions...but those symptoms you originally typed scream a blockage in exhaust, a blockage will damage 02 sensors so i would take this for a long test run because if it does turn out to be a blockage, you could ruin the new sensor if not dealt with sooner rather than later.



#26 Blackie_No1

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Posted 11 December 2013 - 02:51 PM

No split in hose, just collapsed under idle but opens under throttle. The mechanic and I took it out a good run (has to do a minimum 6 mile test cycle on his diagnostic machine)
And no further codes found. We then came back and did a key test (key in, engine not running) and still no codes.

I'm currently on a run with a 18mile round trip, and so far so good.

Yea it can be tough to diagnose over the web, but suggestions where what I was after as I was baffled going on my own knowledge of cars and what my little scanner was telling me.

Thanks to all your input guys.

#27 wase16ll

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Posted 11 December 2013 - 02:55 PM

hope its sorted, but a strange set of symptoms for a bad sensor...



#28 Blackie_No1

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Posted 11 December 2013 - 03:18 PM

As do I wase, thanks again for your help

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#29 jeebowhite

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Posted 11 December 2013 - 05:05 PM

What was the total bill then?



#30 Blackie_No1

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Posted 11 December 2013 - 05:07 PM

Mates rates!! £60 sorted it, including fixing a radiator hose that decided to blow in his yard! Lol He had to cut about 1.5 inches of the end of the hose as it was dozed/rotten.

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