99 Throttle Body - Auto vs Manual
#1
99 Throttle Body - Auto vs Manual
Currently building a 99 engine to swap into my 90 shell. It's currently running on the stock ECU with a FM throttle body adapter.
I have a DIYPNP on the way, so I'd like to ditch the 90 TB in favor of one with a VTPS. It looks like any TB 94+ will work, but I'd like the 99+ for aesthetic reasons - the IACV draws from the intake tube rather than it's own pipe.
Regardless, I'm wondering if there is any functional difference between the auto and manual 99+ throttle bodies, as parts houses seem to list them differently. I'm guessing the throttle rotor is probably different, but not much else.
I have a DIYPNP on the way, so I'd like to ditch the 90 TB in favor of one with a VTPS. It looks like any TB 94+ will work, but I'd like the 99+ for aesthetic reasons - the IACV draws from the intake tube rather than it's own pipe.
Regardless, I'm wondering if there is any functional difference between the auto and manual 99+ throttle bodies, as parts houses seem to list them differently. I'm guessing the throttle rotor is probably different, but not much else.
#2
Boost Pope
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I had always assumed that only the 1.6 cars had different throttle bodies. Now that I look closely, however, the Mazda parts book does indeed list different throttle bodies for AT vs. MT in the '99. I can't figure out why- they have the same TPS and IAC valve, and the intake manifold itself is also the same for MT and AT cars. Same throttle cable as well.
The only other part in the whole system I can find that discriminates between AT and MT is a tiny little mounting bracket which secures the throttle cable near the end. That part is listed for AT only (no MT equivalent), but I can't see how that would affect the throttle body.
I would suspect that it doesn't matter which one you use.
For what its worth, the 1.8 NA lists the same TB for all applications.
The only other part in the whole system I can find that discriminates between AT and MT is a tiny little mounting bracket which secures the throttle cable near the end. That part is listed for AT only (no MT equivalent), but I can't see how that would affect the throttle body.
I would suspect that it doesn't matter which one you use.
For what its worth, the 1.8 NA lists the same TB for all applications.
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