E85 Ethanol Petrol mix...

Reply Subscribe

Thread Tools

Search this Thread

Apr 2, 2016 | 04:15 AM

#21

JagV8

Veteran Member

Joined: May 2009

Posts: 27,534

Likes: 4,916

From: Yorkshire, England

Quote:

Originally Posted by Grio

The car was sort of have a higher surge like rev even when at rest.

Watch fuel trims, hot engine. Do them as it surges as well as at idle and 2000-2500rpm. Could be an air leak but either way you need data it seems to me.

Apr 2, 2016 | 08:54 AM

#22

Mikey

Joined: Oct 2009

Posts: 11,057

Likes: 2,272

From: Perth Ontario Canada

Quote:

Originally Posted by Grio

The car was sort of have a higher surge like rev even when at rest. Jag dealer mechanic said it was due to the different fuel formulations and said it was the butane. I found a huge list of gasoline components.

For over 100 years, mechanics have blamed 'the fuel' rather than admitting they don't know. An excessive amount of butane in gas might (very slight might) have an effect on a carbureted engine in extremely hot weather, but not a fuel injected engine during cool or any other weather.

Apr 2, 2016 | 09:00 AM

#23

Box

Veteran Member

Joined: May 2015

Posts: 1,101

Likes: 648

From: Up, Planet Earth

Understanding the cracking process used in the production of fuel may give you a better understanding. Butanes, propanes and other lighter products created during the cracking process are re-introduced as lighter petrochemical additives to heavier stocks in the creation of gasoline.

Cracking and related refinery processes