why now, sudden decrease in mpg???
Race Director
Joined: Feb 2005
Posts: 16,100
Likes: 17
Maybe your state has switched to ethenol blend fuel..that will do it for sure...even worse if blend is the E85...a few states are at E20....
How is it running? Can you stand on it without any hesitation ?
Rich
How is it running? Can you stand on it without any hesitation ?
Rich
Thread Starter
Instructor
Joined: May 2006
Posts: 122
Likes: 1
From: hazlet township nj
4 of the plugs are new and the air cleaner is also new. Slight stumble from a stop. Other than that it runs very strong. I use sunocco 93 or Exxon 93 here in Jersey. Not sure about the ethanol content.
Race Director
Joined: Feb 2005
Posts: 16,100
Likes: 17
Originally Posted by 77 zz4
4 of the plugs are new and the air cleaner is also new. Slight stumble from a stop. Other than that it runs very strong. I use sunocco 93 or Exxon 93 here in Jersey. Not sure about the ethanol content.
Why just 4 new plugs ? I'd check plugs...then tune engine..
Rich
Drifting
Joined: Nov 2005
Posts: 1,795
Likes: 1
NJ is now at 10% ethanol.
im also curious as to why only 4 plugs? and only thing i can think of
is did you check the replaced plugs for proper gap?
i know a lot of people that think they are gapped from the factory
and just throw them in.
im also curious as to why only 4 plugs? and only thing i can think of
is did you check the replaced plugs for proper gap?
i know a lot of people that think they are gapped from the factory
and just throw them in.
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Team Owner
Joined: Jul 1999
Posts: 65,492
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From: Orange Park Florida
Have you loosened the reset the timing lately?? if so, and it was off a decent bit, two things to check, that the harmonica balancer is not slipped on it's rubber damper....and then, IF the timing was seemingly 'retarded' a fair amount when you set it, you may be fighting a slipped timing chain....engine will run kinda rough but still run with reset timing at the dist, which in fact only masks the fact of the cam timing being way in hell off, and it looks 'normal'.....when reset....
Burning Brakes
Joined: Jul 2003
Posts: 1,072
Likes: 1
From: San Antonio Texas
Originally Posted by rihwoods
Maybe your state has switched to ethenol blend fuel..that will do it for sure...even worse if blend is the E85...a few states are at E20....
Race Director
Joined: Feb 2005
Posts: 16,100
Likes: 17
Originally Posted by TheDarkKnight
Not true. E10 has been found to provide a slight improvement if any change is statistically significant. If he ran E85 by mistake, the engine would sputter like crazy depending on how much E85 was in the tank. The more the E85 the worse it would be as it would run horribly lean. Of course, if he was running FI the effects would be less. On my C5 I show an approximate 5-9% better MPG than straight gasoline.
Burning Brakes
Joined: Jul 2003
Posts: 1,072
Likes: 1
From: San Antonio Texas
Originally Posted by rihwoods
I think results are much different with pre-1988 cars...
Not likely. The energy content of E10 is less than 5% difference. The normal variation of base gasoline is greater than that. A drop from 14 to 18 is a lot more than 5%, or even 10%. That's about a 42% drop.
I ran my 74 Hornet on E10/G100 with no noticable difference. Granted my tests back then were not as rigorous as they are now. But no noticable difference is still no noticable difference.
There is no way E10 can be the cause of a 42% drop in fuel economy.
