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MK 7) hunting/surging at idle, lacking power, p0089

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MK 7) hunting/surging at idle, lacking power, p0089

Postby jacko1611 » Sat Sep 18, 2010 2:02 pm

if your mk7 has any of those symptoms or cuts out/stalls at junctions or runs rough and sounds noisey chances are that the van requires a pcm recalibration/software update. this can only be done at fords or at a garage which has access to the ford diagnostic computer. after a recalibration a process called fuel pump learn needs to be carried out and then another called fuel pressure relief valve counter reset. the pressure relief valve is in the end of the fuel rail. this can sometimes activate and blow out, allowing fuel to escape the fuel rail and down the return line. this blows due to the fault in the pcm calibration, dosnt always. an easy way to tell is to pull the pipe from the end of the fuel rail (push in the red tab) start the van up and watch to see if fuel is running out the end of the rail as the van surges.

if u just replace the valve it will blow again without the pcm recalibration, pump learn and relief valve counter reset so a trip to fords is needed.

written up so i dont need to type this ever again! lol
not another E G F*****G R!
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Re: mk7 hunting/surging at idle, lacking power, p0089

Postby gary allen » Sun Oct 03, 2010 2:29 pm

thanks to Jacko 1611 for responding to my question . I will take it to my local dealer for recalibration. Many thanks.
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Re: mk7 hunting/surging at idle, lacking power, p0089

Postby g-man » Sun Oct 03, 2010 4:30 pm

i luv you techs,keep the info coming
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Re: mk7 hunting/surging at idle, lacking power, p0089

Postby cts1975 » Thu Nov 11, 2010 8:55 pm

Thanks to Jacko.
I had this done about 3 weeks ago after posting on this forum.
It drove like a different vehicle. I had an extra symtom though - mine wouldn't tick over if i started it to soon after switching off.

Sadly though all my original symtoms have returned this week. It going in to Ford tomoz for them to have a look at.
Do you have any suggestions as too why the symptoms have retruned?
Can the PCM update be done succesfully without the fuel pump learn & PRV counter reset being done?
I suspect the reason you posted the guide was to draw a line under repeating yourself again and again.
I'm just gutted as it has been driving brilliantly since the PCM and now I'm back to the original problem!
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Re: mk7 hunting/surging at idle, lacking power, p0089

Postby TIMO » Thu Nov 11, 2010 8:57 pm

should this be made a sticky ?
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Re: mk7 hunting/surging at idle, lacking power, p0089

Postby Altransit » Thu Nov 11, 2010 8:59 pm

TIMO wrote:should this be made a sticky ?

Is it not already then?
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Re: mk7 hunting/surging at idle, lacking power, p0089

Postby DEAN MACHINE » Sat Dec 04, 2010 4:47 pm

how much do ford charge for the pcm update?
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Re: mk7 hunting/surging at idle, lacking power, p0089

Postby cts1975 » Sat Dec 04, 2010 8:19 pm

£65
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Re: mk7 hunting/surging at idle, lacking power, p0089

Postby ake » Sun Dec 05, 2010 9:09 pm

DEAN MACHINE wrote:how much do ford charge for the pcm update?

Ususally one hours labour, but I'm sure if you had it added to a service it would be cheaper
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Re: mk7 hunting/surging at idle, lacking power, p0089

Postby fedup2 » Sun Dec 05, 2010 9:13 pm

Would having a map done eliminate the need for this or would it be required before hand?
I dont have any problems just noisy injectors when cold.130ps mk7
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Re: mk7 hunting/surging at idle, lacking power, p0089

Postby ake » Sun Dec 05, 2010 9:17 pm

fedup2 wrote:Would having a map done eliminate the need for this or would it be required before hand?
I dont have any problems just noisy injectors when cold.130ps mk7

Depends who does the map, Martyn can update to latest spec :)
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Re: mk7 hunting/surging at idle, lacking power, p0089

Postby fedup2 » Sun Dec 05, 2010 9:23 pm

ake wrote:
fedup2 wrote:Would having a map done eliminate the need for this or would it be required before hand?
I dont have any problems just noisy injectors when cold.130ps mk7

Depends who does the map, Martyn can update to latest spec :)


But hes 200 odd miles away,but thats what i needed
Thanks!
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Re: mk7 hunting/surging at idle, lacking power, p0089

Postby SAFtransit » Fri Jan 14, 2011 6:05 pm

I have removed my pressure relieve valve and it is in several compnents.It does not look damaged its just not on one piece.Does this mean it needs replaced?
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Re: mk7 hunting/surging at idle, lacking power, p0089

Postby jacko1611 » Fri Jan 14, 2011 7:06 pm

yes
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Re: mk7 hunting/surging at idle, lacking power, p0089

Postby SAFtransit » Fri Jan 14, 2011 7:09 pm

Thanks for the reply,

After putting it all back in I went for a drive,had to crank it a couple of times to get new fuel through.

Anyway its now not juddering when on idle.I dont quite understand why the problem had now gone away simply by taking the prv out and putting it back in.
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