Lack of power at high altitudes.

patrolman pete · 18th June 2012, 22:38

I'm currently on holiday in Pinoso in Spain after a very enjoyable three day drive on some great roads, especially the A23 down from Pamplona to Valencia. However as i noticed last year in Andorra the car seems to have a bit of a flat spot once up in the mountains. Even on a level road if you are under 2000 rpm she is flat and unresponsive before taking a gulp of air at just over 2200 rpm and away she goes. I have no problems back home and through France on the way down everything is spot on. Last year i changed the MAF just because it was origional but okay . Other than that no problems. Anyone else ever noticed this on your Euro Trips?

Leyland Worldmaster · 19th June 2012, 00:09

Quote:

Originally Posted by patrolman pete

I'm currently on holiday in Pinoso in Spain after a very enjoyable three day drive on some great roads, especially the A23 down from Pamplona to Valencia. However as i noticed last year in Andorra the car seems to have a bit of a flat spot once up in the mountains. Even on a level road if you are under 2000 rpm she is flat and unresponsive before taking a gulp of air at just over 2200 rpm and away she goes. I have no problems back home and through France on the way down everything is spot on. Last year i changed the MAF just because it was origional but okay . Other than that no problems. Anyone else ever noticed this on your Euro Trips?

Thinner air; the higher the altitude the lower the Oxygen levels. I had a lack of power too once; never experienced it before; just got out of the camper -having slept all the way there- and was really breathless for a minute or so. I think a recent Top Gear Challenge covered this too!

carcass · 19th June 2012, 00:24

my original maf died on me on a trip to Serra da Estrela, (mountain ~2000m, highest point on Continental Portugal) at approx.. 1500-1700m, the symptoms were as you described!

patrolman pete · 19th June 2012, 09:20

I thought that the MAF was to compensate for the altitude amongst other things. I remember years ago following a diesel Sherpa up the passes towards Andorra and it crawled at a snails pace whilsts belching black smoke from it's exhaust . Judging at the the slow pace of the other diesel cars here i'll just have to sit back and go with the flow then

FrenchMike · 19th June 2012, 09:35

It's the role of the boost pressure sensor to compensate for altitude.

Situated on the inlet manifold

18th June 2012, 22:38	#1
patrolman pete Posted a thing or two Rover 75 club se tourer CDT and a Connoisseur SE Diesel Auto Saloon Join Date: Nov 2006 Location: Houghton - le - Spring Posts: 1,436 Thanks: 618 Thanked 333 Times in 197 Posts	Lack of power at high altitudes. I'm currently on holiday in Pinoso in Spain after a very enjoyable three day drive on some great roads, especially the A23 down from Pamplona to Valencia. However as i noticed last year in Andorra the car seems to have a bit of a flat spot once up in the mountains. Even on a level road if you are under 2000 rpm she is flat and unresponsive before taking a gulp of air at just over 2200 rpm and away she goes. I have no problems back home and through France on the way down everything is spot on. Last year i changed the MAF just because it was origional but okay . Other than that no problems. Anyone else ever noticed this on your Euro Trips?

19th June 2012, 00:24	#3
carcass Regular poster Rover 75 CDTi sportpack "anniversary edition" Join Date: May 2009 Location: Lisboa Posts: 70 Thanks: 1 Thanked 0 Times in 0 Posts	my original maf died on me on a trip to Serra da Estrela, (mountain ~2000m, highest point on Continental Portugal) at approx.. 1500-1700m, the symptoms were as you described!

19th June 2012, 09:20	#4
patrolman pete Posted a thing or two Rover 75 club se tourer CDT and a Connoisseur SE Diesel Auto Saloon Join Date: Nov 2006 Location: Houghton - le - Spring Posts: 1,436 Thanks: 618 Thanked 333 Times in 197 Posts	I thought that the MAF was to compensate for the altitude amongst other things. I remember years ago following a diesel Sherpa up the passes towards Andorra and it crawled at a snails pace whilsts belching black smoke from it's exhaust . Judging at the the slow pace of the other diesel cars here i'll just have to sit back and go with the flow then

19th June 2012, 09:35	#5
FrenchMike This is my second home Rover 75 Saloon Join Date: Aug 2007 Location: Avignon Posts: 4,466 Thanks: 94 Thanked 661 Times in 554 Posts	It's the role of the boost pressure sensor to compensate for altitude. Situated on the inlet manifold