155 - down on power
I went out in my friends Fiat Brava HGT the other day and it pulled like a train in every gear upto about 110mph (when he slowed up) which impressed me alot, he told me it had 152hp and was a brand new engine, but it made me a little disappointed about the performance of my 2.0 litre twinspark. My engine has done 115k but i wouldn't have expected the performance to drop so significantly, it is afterall just 10 years old. I have change the oil regularly and the plugs were changed by the previous owner less than 20k ago. The engine revs freely, however, there is a distinct 'pause' in the power at about 2500rpm and further up the rev range when i'd expect the variable valve timing to produce a small (or large) kick in the pants!, there is nothing.
Any ideas what the problem might be?, i've read that mass air flow sensors can be a problem or could it be the coil packs or spark plug leads?