Does AWS cause the 3k rpm stumble?
08-20-03, 06:58 PM
#1
Speed Mach Go Go Go
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Does AWS cause the 3k rpm stumble?
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.
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.
08-21-03, 08:57 PM
#4
built my own engine
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
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
08-21-03, 08:58 PM
#5
No it's not Turbo'd
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...
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...
08-21-03, 10:06 PM
#7
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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?
Does anyone with block off plates still have the 3k hesitation?
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08-21-03, 10:40 PM
#8
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Originally posted by GoRacer
Does anyone with block off plates still have the 3k hesitation?
Does anyone with block off plates still have the 3k hesitation?
08-21-03, 10:59 PM
#9
built my own engine
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
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 righthehe
08-21-03, 11:05 PM
#10
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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
-pete
08-21-03, 11:59 PM
#14
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.
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.
08-22-03, 12:04 AM
#15
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^ 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?
Have you ever removed the plates for the double throttle out of the throttle body?
08-22-03, 12:36 AM
#17
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^ 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?
08-22-03, 01:05 PM
#19
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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
. That's the "brain" if you will for the ignition coils.The fuel pressure regulator is located on the secondary fuel rail.
Dale
08-22-03, 02:33 PM
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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?
08-22-03, 03:20 PM
#21
Originally posted by byrden
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?
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?
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.
08-22-03, 03:47 PM
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Originally posted by Mahjik
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.
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.
08-22-03, 03:56 PM
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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).
08-22-03, 04:31 PM
#25
Originally posted by byrden
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).
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).
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