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Mk1.5 Focus Will Not Rev When Warm


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#31 jeebowhite

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Posted 11 December 2013 - 05:41 PM

Not bad at all!



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#32 Blackie_No1

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Posted 11 December 2013 - 05:46 PM

If its cured, yes lol

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#33 Blackie_No1

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Posted 14 December 2013 - 06:18 PM

Ok, not cured. I put £30 of fuel in the car after it was worked on which took it to just below half full. I've driven 96.6 miles and it has gone just below a 1/4 full again and it's started all over again, though this time I didn't switch the car off, just let it idle for a few mins. Bit of a scattery vid here but hopefully you get the point. At the start before I put the hazards on the accelerator is flat to the floor! It then gets to the point where it nearly dies, so I stop the car and get out and try to get a clip of the exhaust note.

#34 Blackie_No1

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Posted 15 December 2013 - 01:00 PM

I'm going down wase16ll's route and going to dismantle the exhaust system today. The cat I've been told is hollowed out, but I'll find out for sure later, though I'm not so sure based on the evidence of a blowout between the manifold and the cat.

#35 Blackie_No1

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Posted 15 December 2013 - 03:10 PM

First off, the cat, well not so much off as in dropped from manifold, defo not it, it has indeed been hollowed out due to it collapsing in the past:

DA0D9F45-23A3-4EB2-8EE2-E7CC1F16A2D5_zps

Had to stop as I'm working outside and the rain has got just to much :(

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#36 wase16ll

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Posted 15 December 2013 - 05:45 PM

as i understand it...you had 02 sensor changed, drove 90 miles before problem reoccured

 

was that in a single journey?

 

also, this time, you didnt switch off, let it idle for few minutes, then found the power returned?

 

blockage is still a possibility, so still worth carrying out checks for it...but if you can get hold of a tester, may be worth carrying out a fuel pressure test, you might have a problem with the pump



#37 Blackie_No1

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Posted 15 December 2013 - 05:52 PM

No it was from Wednesday to yesterday, to and from work mainly, 13+ miles each way.

Yea, I just let it tick over for a while before driving on.

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#38 wase16ll

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Posted 15 December 2013 - 06:57 PM

exhaust blockage or fuel pressure problems, including a blocking filter, could give you these symptoms without flagging any codes/faults

could also be a problem with maf sensor, but would be unusual for that to happen and not flag anything.

 

may also be worth testing throttle position sensor, reasonably easy test if you have a voltmeter



#39 Blackie_No1

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Posted 15 December 2013 - 07:17 PM

Nope but can get my hands on one easy enough, what shouldmi be doing with it?

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#40 Blackie_No1

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Posted 15 December 2013 - 08:08 PM

Got the front pipe separated from the middle exhaust section. I was able to see up the first (essentially straight through silencer) to the bend and no sign of blockage, not sure of the second silencer yet, but I have a feeking it isnt blocked.

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#41 wase16ll

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Posted 15 December 2013 - 09:01 PM

problem with the silencers is you wont see through them anyway...ideally to test for blockages is what i wrote a few posts back or find someone with a back pressure tester.

 

if you can get hold of a fuel pressure tester, you connect it to the schraeder valve on the fuel rail and read the pressure at idle with pressure regulator vacuum disconnected..should read approx 4 bar, with vacuum connected and assuming the vacuum is good (approx 5psi) pressure should read approx 3.5 bar

 

the TPS should be a 3 pin sensor...disconnect and connect an ohm meter to the outer pins (1 and 3) of the sensor, approx just under 4k ohms

connect ohm meter to pins 2 and 3

with butterfly closed..approx 4.2k ohms, butterfly fully open, approx 1,2k ohms...but its vitall that the resistence reading is a smooth curve from closed to open and back, so operate the butterfly slowly and watch for any sudden jumps/drops in readings as that will indicate a faulty sensor.

 

may pay to renew the fuel filter anyway, but at least diconnect the filter and drain it to see if the fuel is coming out clean



#42 Blackie_No1

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Posted 15 December 2013 - 09:03 PM

Yea, gonna replace the filter just to see as you say

#43 Blackie_No1

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Posted 17 December 2013 - 09:13 PM

Someone has suggested a coil pack, what's your thoughts wase16ll?

#44 wase16ll

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Posted 19 December 2013 - 09:27 PM

going by the fact you believe there is no misfire when power drops, its unlikely.

if there is a misfire thats bad enough to virtually bring the engine to a halt, will almost certainly have set a code and flagged a light



#45 Blackie_No1

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Posted 19 December 2013 - 09:31 PM

Yea that's sort of what I was thinking. No miss firing or hesitations at all, just a sudden loss of power and will not accelerate/rev.

I can't get anyone here in N.ireland who can pressure test the exhaust, but I stuck an airline down it and there felt like a good flow, so I don't think it's it.

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