I was reading the manual at work to kill time and noticed it said the AWS restricts airflow to prevent a momentary lean condition when the throttle is suddenly depressed. Well that's pretty close (put manual away).

Does anyone with block off plates still have the 3k hesitation?

Has anyone just removed the coins (round gold plates) inside the throttle body to get rid of the AWS. McGyver told me to do it.

 

Why would it? The car didn't roll off the showroom floor with a 3k hesitation and AWS enabled....

 

 

if you have the 3k hesitation, try this....

take out your fuel pump resistor (located below your brakebooster, looks like a heat sink, 4" long, 1" wide approx..)

cross the wires that goto it, drive your car

if it disappears....i'm right

 

Not that I know of, typically it's a grounding issue, and / or a fuel map hole that exists once you hit 32 K or whatever the breakin period is on the ECU...

For me adding a touque brace, or Cleaning the contacts between the engine and the body, helped, and then installation of a mappable ecu cured it completely....

From what I heard it's an ignition hole in the map that is worsened by a bad ground...

 

grounds don't do Sh*t for the 3k hesitation. I got like 10 grounds on my car and i still get the same thing.

 

Has anyone noticed that it goes away after the car has been driven for 10-15min (fully warmed)? So maybe the AWS kicks in when the 2nd turbo prespools or it could be the AWS not working correctly. Is anyone an original owner? ...did it have it when new?

Does anyone with block off plates still have the 3k hesitation?

 

I have blockoffs and still have the 3k hesitation (or violent bucking in my case) sometimes. No upgraded grounds though.

 

my personal theory is that is has to do with the fuel pump transition from low duty to high duty

eliminate the fuel pump resistor and force it into high speed mode and if you still have it, prove me wrong until then, i am right

hehe

 

Had it for 6 months. Blocked off the EGR, problem went away. I'm not saying this is the fix, just that I'm glad I don't have to worry about it anymore. Like someone said before, it only happened when it was cold.

-pete

 

Is this it? I always thought it was the fuel pressure regulator.

 

Nevermind, i found it it's further down with only 2 wires connected. I guess that IS the FPR.

 

All I did was change my plug wires and it went away. Weird huh? So many fixes for different cars.

 

You seem to be confusing the AWS and DTC (double throttle control). The AWS is just a solenoid that allows air to bypass the throttle plates.

AWS has nothing to do with 3k rpm hesitation. I've had 13 FDs they've all had the 3k rpm hesitation. It only happens when the car is warming up. When fully warm it doesn't happen.

 

^ yes, I thought they were both the same. So the question should be: "Is the double throttle the cause of the 3k stumble?"

Have you ever removed the plates for the double throttle out of the throttle body?

 

mine are gone and I still have a hesitation when it is cold.

Also, don't go removing the plates from the TB, the double throttle plates are in the UIM.

 

^ huh? there behind the primary plates. Staring at the throttle body with the elbow takin off there are two circular gold plates on top and one below. Behind the two top ones are two more just before the UIM. Are these not the double throttle plates?

 

Yes you are correct, I was just responding to this.

 

The box circled in the pic is the ignitor, not the fuel pressure regulator . That's the "brain" if you will for the ignition coils.

The fuel pressure regulator is located on the secondary fuel rail.

Dale

 

I tried jumping the fuel pump resistor with no luck. This hesitation issue drives me nuts. Is the most sucessful fix for this hesitation to get a programable ECU like the Apexi Power FC? I've had the car about 2 months now and the PO mentioned that the car had a factory reprogramed computer. Anyone heard of this and what was it supposed to fix?

 

Did the previous owner mention who reprogrammed the computer? Reprogramming the computer, basically they add a daugherboard to use differently programmed chips for increased performance.

Yes, some people have fought the 3k hesitation by purchasing a programmable ECU such has the Power FC. However, IMO, that's a bandaide not a fix. While the hesitation may be not noticeable, it may still be there.

We know the cars didn't come off the assembly line with the 3k hesitation. Also, not all cars exhibit this problem (mine doesn't). The stock ECU didn't reprogram itself over the course of the years so replacing that to fix the problem should be a last resort (unless that's what you really want).

The problem is that various fixes have helped different cars. Some fixes work for some cars, other fixes don't. If I had the problem, I would look into my stock grounding locations first. Next, I would check my coils followed by the flow rate of my injectors... basically things that wear over time but aren't necessary replaced when a new engine is installed.

 

damnit, that means i'm wrong

 

 

I got the impression from the PO that there was updated Mazda software that was programed into the stock ecu, I guess by a dealer. My impression was that he didnt know much about cars so he might not know what he was talking about. I asked him if it was infact a stock ecu and he said yes. My car is a '93 base, and the only mods on the car when I bought it are a downpipe and a catback (and a boost gauge ofcourse).

 

Ok, it was probably just a recall or TSB done on the car. I seem to remember a problem that called for an ECU replacement but for some reason the TSB list isn't working right now or else I would point you to it.