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Mk1.5 Focus Will Not Rev When Warm


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#1 Blackie_No1

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Posted 07 December 2013 - 11:03 AM

Hi all, so I've had my mk1.5 Focus 1.8 petrol for a few weeks now and as of last night it has developed a problem. When the engine gets up to normal operating temp(half way indicated on the temp gauge) it starts to loose power and will not rev. Sometimes it cuts out altogether sometimes it will continue to idle, but will not rev. If you leave it for a few minutes it will run again, but only for a couple of miles and then back to this. The longer you leave it not running, the longer it drives as normal until it starts again. Other info, not sure of its relevance; No EML, when's diagnostic scanner is plugged in its showing no faults either, but it is only a basic scanner. Fuel level is just below a qtr of a tank. Before this there was an intermittent fault of p0133, slow response O2 sensor bank 1 Sensor 1. Can anyone offer any help?

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#2 mick85

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Posted 07 December 2013 - 11:27 AM

That fault could be fuel pressure meanin new pump,map sensor or possible intake leak I would be betting on fuel pump if u can get pressure check should be 3.8 bar

#3 Blackie_No1

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Posted 07 December 2013 - 11:31 AM

I had a tiny thought in my head it could be that, but then quickly put it outta my head!

Fairly expensive I'd imagine?

Is there such a thing as a fuel pressure tester or how would I check the pressure?

#4 Blackie_No1

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Posted 07 December 2013 - 11:55 AM

Oh, I'm guessing it would need to be tested whilst the problem is occurring?

#5 mick85

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Posted 07 December 2013 - 11:58 AM

U can buy I pressure tester but doubt they cheap test is pretty easy do to car pumps not cheap for genuine but u can get cheaper ones

#6 Blackie_No1

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Posted 07 December 2013 - 01:04 PM

A friend of mine has a snap on scanner and is going to check the live data for the fuel pressure :)

#7 Blackie_No1

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Posted 10 December 2013 - 05:59 PM

Anyone else have any further ideas?

#8 mick85

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Posted 10 December 2013 - 06:01 PM

Have u checked anything yet to rule out stuff

#9 Blackie_No1

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Posted 10 December 2013 - 06:25 PM

Had a look round the intake area and the fuel hoses at the engine, but nothing obvious

#10 wase16ll

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Posted 10 December 2013 - 09:36 PM

all the symptoms you have given point to an exhaust blockage



#11 Blackie_No1

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Posted 10 December 2013 - 09:42 PM

It has a full s/steel system except for the cat, seems to be good pressure from the tail pipe? I had a mk1 1.8 Mondeo that had a blocked cat and it was different as in it had no power at all, neither warm nor cold

#12 wase16ll

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Posted 10 December 2013 - 09:45 PM

is that a new system, or old

not saying this is your problem, but the symptoms perfectly match a blocked exhaust



#13 Blackie_No1

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Posted 10 December 2013 - 09:46 PM

Ah right, the system has been on the car for a while, a few years as far as I am aware

#14 wase16ll

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Posted 10 December 2013 - 09:58 PM

unless new, the fact its stainless is immaterial, blockages will be internal.

gasses are escaping, but not fully, hence why car runs ok when cold, as engine warms up the pressure builds up to the point its creating back pressure, when thatr happens, car loses power to the point it doesnt rev or dies.

leave the car for a few minutes, some of that pressure gradually releases...hence you can then drive a short distance before problem recurs...longer you leave the car, further you will get.

the code that was flagging previously was an early sign of the problem

 

most common areas of blockages is the cat or the rear silencer...though blockages can occur anywhere in the system

if the cat has broken up, it can send pieces further down the system so it may even be blocked in the pipework between silencers.

by the way...blocked/collapsed cats dont always give themselves away with the rattling



#15 Blackie_No1

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Posted 10 December 2013 - 10:07 PM

That sounds logical enough! Will start removing it bit by bit from the rear then :)

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