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 Posted: Sun Jan 04, 2015 12:22 pm |
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Joined: Jul 01, 2014
Posts: 43
Trade Rating: 0
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Hello.
My HDI has never done more than 80mph on a flat road.
Recently i have had an issue where the power will shoot to more than ever for about 30 seconds before returning to normal
Any ideas what would be causing this?
Should I unclip the EGR Valve? Could it be the fuel pump?
Obviously i would like to utilize this higher power as the car is capable of producing it.
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Last edited by MattBurrows on Wed Jan 21, 2015 10:30 am; edited 4 times in total
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Posted: Sun Jan 04, 2015 12:44 pm |
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Joined: Feb 07, 2010
Posts: 729
Trade Rating: 0
Location: Norfolk
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Get the ecu fault codes read..
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Posted: Sun Jan 04, 2015 12:49 pm |
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Joined: Jul 01, 2014
Posts: 43
Trade Rating: 0
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do you think disabling the EGR Valve would be a good idea anyway? and is it easy to do?
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Posted: Sun Jan 04, 2015 1:02 pm |
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Joined: Jan 29, 2011
Posts: 6526
Trade Rating: +10
Location: Westhoughton, Lancashire
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I would stop driving the car immediately as you cannot control the speed of the engine and therefore the car is not in safe working order for use on the public road.
Did the engine revs increase when the car suddenly had an increase of speed? Go off the noise from the engine, not what the dash said.
Has the EML illuminated?
What year is the car?
Any Peugeot service history?
Intermittent faults are always difficult to find and sods law says that as soon as you start looking for it, it won't happen. Stop looking for the fault and it will happen all the time.
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Posted: Sun Jan 04, 2015 1:05 pm |
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Joined: Dec 04, 2012
Posts: 543
Trade Rating: 0
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| MattBurrows wrote: |
| do you think disabling the EGR Valve would be a good idea anyway? and is it easy to do? |
Get the codes read first, then speak to southwestchap.
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Posted: Wed Jan 21, 2015 10:27 am |
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Joined: Jul 01, 2014
Posts: 43
Trade Rating: 0
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On closer inspection, the back box was rusting away, the connection to the main pipe was splitting and causing the surges in power.
I have now fitted a straight thru exhaust and had the cat piped off.
It now runs great.
Thanks guys : )
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Posted: Wed Jan 21, 2015 1:50 pm |
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Joined: Feb 07, 2010
Posts: 2720
Trade Rating: +6
Location: UK
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Are you sure? Can't see how that would cause a power surge
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Posted: Thu Jan 22, 2015 9:26 am |
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Joined: Jul 01, 2014
Posts: 43
Trade Rating: 0
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yeah, when the join started to crack, exhaust gasses would escape, back pressure would decrease and off it would go.
when the join cracked apart completely, the backbox was no-longer connected and i had loads of power.
After getting the decat and thru pipe fitted, back pressure is at a minimum and it flies along.
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Posted: Thu Jan 22, 2015 1:11 pm |
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Joined: Feb 07, 2010
Posts: 2720
Trade Rating: +6
Location: UK
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I ran mine with no back box for a month. Made no difference to power. It's getting pressure from the turbo anyhow
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Posted: Thu Jan 22, 2015 1:20 pm |
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Joined: Jul 01, 2014
Posts: 43
Trade Rating: 0
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Whats your engine size...
This definatly made a difference. Top speed was 80, now it's above 110, but Im not sure exactly!
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Posted: Thu Jan 22, 2015 1:41 pm |
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Joined: Feb 07, 2010
Posts: 7093
Trade Rating: +11
Location: Suffolk
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This shoudl make no difference unless you backbox completely collapsed in on itself which i doubt.
Probably a vacuum leak
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Posted: Thu Jan 22, 2015 2:06 pm |
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Joined: Feb 07, 2010
Posts: 2720
Trade Rating: +6
Location: UK
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Mine was a 2 litre. I was going to suggest turbo surging
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