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The FD changes a fair bit between 1992 and 2002, and this is an attempt to document some of these changes. there is another thread with the turbos (N3A1, N3C1 and N3G1) and i'm working on one for the lower intake manifolds too.
We are all familiar with the top of the thing, and this stays the same, its the bottom that changes
We begin with the US intake, as this is what most of us started with, N3A1-13-23XC. The US manifold is weird as it has provisions for the AWS (accelerated warmup system) valve. The valve and pipe for it are basically dead center.
The next one is the early non AWS version, N3A7-13-23XB. Everything is the same as the AWS version, except it does not have the AWS stuff machined. These cars have the same throttle body elbow as the US cars but it has a "rubber" cap on the hose barb.
The next version is after Mazda stops exporting the car, the AWS is no longer needed and the casting goes away. N3A7-13-23XC (probably)
Then the final version occurs in 1996 with the advent of the magic box instead of the 92-95 solenoid rack. the Purge Solenoid gets moved to the upper intake. N3F1-13-23X
There are also 2 or 3 versions of the lower intake manifold as well. Main differences is EGR/no EGR and the 96+ don't have the 4 vacuum lines that go through the manifold, they go around the manifold.
US cars got rid of EGR in 95. The system was worthless anyhow - Mazda made the gasket with a TINY pinhole that would immediately clog up.
Dale
^I've often wondered why Mazda has added and then removed EGR from its rotaries in the US market several times over the years. For example, the S4 turbos ('87 - 88) had it; S5 turbos (89 - 91) did not. Then it came back on the FDs, perhaps because of more stringent federal emissions requirements, only to be deleted in '95 before FD sales in the USA ended.
Yeah it is a mystery. It may be that they required it with a new model then when they could demonstrate that it would pass the tests without it they could drop it or something.
Australian cars....and I'd assume UK market as they were pretty much the same, got AWS, if meaning that and talking about the UIM?
EGR is described in the local workshop manual, which might just be a result of it being a common english language market publication with different illustrations. Did get the pre-cat too, can't say I've seen a local delivery 92 LIM to see if they whacked the silly valve on though.
The European catalog shows it, this catalog is LHD, so its Europe, but not the UK (France, Germany, Italy, etc), its the EGR valve without the sensor, like a Ferderal 1993 car, they also get the precat
Ebpotia is Ukrainian for Europe, so we learn a little there too
The European catalog shows it, this catalog is LHD, so its Europe, but not the UK (France, Germany, Italy, etc), its the EGR valve without the sensor, like a Ferderal 1993 car, they also get the precat
Ebpotia is Ukrainian for Europe, so we learn a little there too
Originally Posted by arghx
ah so continental/left hand drive europe spec is similar to US Fed spec. Makes sense.
I have a 92 FD, European model (Swedish), I did not have EGR on mine.
06-30-21, 09:52 AM
