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Author Topic: Lower on power and down on MPG  (Read 1205 times)

Offline Alhambra King

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Lower on power and down on MPG
« on: November 18, 2018, 08:21:41 am »
Hi guys, my older 03 Alhambra 1.9Tdi has started to act up. There are no fault codes and it still drives well but is deffinately lower on power then it used to be (not dead like a dodgy MAF) just less power. The MPG is now struggling to get above 40 and there is a stronger exhaust smell. It's also taking much longer to reach operating temperature when the aux heater isnt being used.
Wondering if it's a dodgy sensor or injector?

Offline Alhambra King

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Re: Lower on power and down on MPG
« Reply #1 on: November 19, 2018, 08:13:09 pm »
Anyone? ???

Offline Chrispb

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Re: Lower on power and down on MPG
« Reply #2 on: November 19, 2018, 09:30:41 pm »
Sounds about right for this time of year.
2016 Vauxhall Insignia Elite Nav in White 2.0CDTI Manual.
2009 Kia Sedona GS In Black 2.9CRDI 183PS. 5 Speed Manual WAV.
2003 MK2 Galaxy Ghia In Solid Black 1.9 TDI 115PS. 5 Speed Automatic.

Upgraded Eberspaecher booster heater  to independent heating with 7 day timer.

With VCDS lite (full version) need a code clearing or want to scan for faults in the north kent area, PM me.
All for a pint of Strongbow.

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Offline Alhambra King

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Re: Lower on power and down on MPG
« Reply #3 on: November 22, 2018, 11:23:15 pm »
Hi Chris thanks for the reply but I've lived with this car for the last 9 years so I know it's quirks. It's not normal for mine to never get to temp and even in -4 it still used to get mid 40s on MPG so somats up!

Offline brianh

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Re: Lower on power and down on MPG
« Reply #4 on: November 22, 2018, 11:27:56 pm »
I'd wonder if your thermostat is open when it shouldn't be if its a noticeable change, could have been like that a while and not noticed it until the temperature outside has dropped, If its staying colder than it should it will increase fuel consumption. Only other simple cause that could come to mind is if the air filter is clogged up, though would imagine you've either already changed it or checked it at least. (would explain exhaust smell)

Offline johnnyroper

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Re: Lower on power and down on MPG
« Reply #5 on: November 23, 2018, 06:56:44 am »
Another vote for thermostat mine was like that post head gasket change. Turned out the thermostat was closed when I removed it to test and it opened at correct temp however it had gone weak so with water pressure behind it the stat would push off its seat. New thermostat fitted and even when boost heater was knackered warm up time was not much longer.

I would change thermostat and coolant,bleed system and then see how it goes. That would not account for the low power though.
Also check and clean EGR valve and check all vac lines make sure non are cracked.

Offline mike wilson

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Re: Lower on power and down on MPG
« Reply #6 on: November 23, 2018, 08:54:38 am »
Only other simple cause that could come to mind is if the air filter is clogged up, though would imagine you've either already changed it or checked it at least. (would explain exhaust smell)

I'm not sure that's logical on a modern, injected engine.  If less air goes in, the engine management system should detect that and put in less fuel.  There would presumably come a time when the combination of throttle position, road speed and sensed air flow would exceed parameters but that would have to be pretty high, considering all the lead-footed drivers.

Offline johnnyroper

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Re: Lower on power and down on MPG
« Reply #7 on: November 23, 2018, 10:14:53 am »
A clogged filter would still cause it to be down on power because actual fuel quantity compared to desired in relation to throttle demand would be lower.

Offline Alhambra King

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Re: Lower on power and down on MPG
« Reply #8 on: November 23, 2018, 10:30:59 am »
Thanks fellas,

The filter was changed at service around 3k miles ago but I will check it just to sure. Having chatted with the good lady I think its probably not down on power so much that I've just got used to the more powerful one I drive daily so its different to how I remember.

Will get the thermostat changed and come back to you. Thanks for the help thus far!

 

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