Sequential fire or Batch Fire?
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Rising emissions standards is the reason, and it's not just CA and MA that got these trucks it's all the others and Canada too. CA and MA have stricter state emissions standards then the Federal Govt so they often got these trucks a year before everybody else, for example there are OBD-2 trucks with a '95 build date in Cali.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Ok I did some research over on the TRS forum and it would appear the 4-cyl MAF Rangers were indeed batch fired not sequential just like the Turbo car engines... cylinders 1&4 together and 2&3 together. The switch to sequential injection corresponded with the switch to the more powerful OBD-2 system which occured as early as '94 in California it would seem.
Posting Guru
Joined: May 2007
Posts: 1,208
Likes: 2
From: North Reading Mass
The Commonwealth of Massachusetts decided that new vehicles sold here would comply with California Emission standards back around 2000. I think some other states are also adopting the stricter California standards.
regards
rikard
regards
rikard
Fleet Mechanic
Joined: Nov 2011
Posts: 1,823
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From: New York
OBD2 was a federal mandate required on vehicles starting in model year '96 but Ford rolled it out to a few product lines (nation-wide) in '95 since it was ready. The Ranger was one of those, making the '95 model desirable to some tuners since it has OBD2 but is not tested as such from an emissions standpoint.
Posting Guru
Joined: Sep 2008
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In other posts I have read there doesn't seem to be a LARGE performance gap between SD and MASS Air. Was the government's push to MASS Air all based on inflated numbers they thought would help emissions or is the difference between SD and MASS Air that noticeable?
Lead Driver
Joined: Jul 2007
Posts: 7,868
Likes: 9
From: Rhode Island
The government/EPA did not push mass-air. There are still speed-density cars being made today, some of them with quite high performance engines too.
Ford for whatever reason felt that it was easier for them to meet the EPA's tightening emissions standards and their customer's ever increasing NVH standards with SEFI and Mass-Air.
Ford for whatever reason felt that it was easier for them to meet the EPA's tightening emissions standards and their customer's ever increasing NVH standards with SEFI and Mass-Air.
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