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New Delay In Throttle Response
Topic Started: Apr 24 2010, 07:06 PM (793 Views)
SilentOne
Stock
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Hey all,

Looking for some insight and things to rule out.

Since doing my headers it's introduced a huge delay from kicking the peddle to moving off the line so to speak. Most noticable when from a stand still.
Also slightly noticeable delay with the 5AT down changes too :/

Common thing would be to clean the MAF sensor - will do that tomorrow but it had a clean when the headers were done not so long ago and I noticed it a few days after having them in.

Is it possible an air temp sensor could be at fault? I had to replace one due to the thread being rusted into the old headers.

Also thought TPS but have no idea where this is in the engine bay and how to test it.

Any other thoughts out there?
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Soiled Altezza
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...
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Doesn't sound like the TPS, it's found on the right hand side of the throttle body when looking from the front of the car. I have a spare one if it does end up being that though.

Could it just be that it's not tuned to the new headers?
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Garage: http://altezza.dualzdesigns.com/viewcar.ph...wner=17&frmpg=0
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Leiden
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NZ, Whangarei
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Did you get the O2 sensors in the right bungs? 5AT's have two and if you got them around the wrong way it would mess with the Closed Loop part of the map, hence why your pressing the throttle down so hard to get any go...

Try swapping them around and doing a ECU reset,
Project Thread
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lonestar
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Im CEO ... B*tch
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I had a similar thing with mine.. turned out there was an air leak and the O2 sensor was giving false readings
TEZHER|00 Qualitat| F1 Eagles| Full Qualitat Body Kit| TRD Radiator Cap| TRD Billet Oil Cap| TRD Valve Caps| TRD Leather Auto Gear Shift Knob| TRD Fuel Cap| TRD Front Tower Strut Bar| +10KW of Bling
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SilentOne
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Cheers all, about to wander out and try a few things. will check the easiest stuff first :D

Lonestar, where was the airleak?
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SilentOne
Stock
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Leiden,Apr 25 2010
11:13 AM
Did you get the O2 sensors in the right bungs? 5AT's have two and if you got them around the wrong way it would mess with the Closed Loop part of the map, hence why your pressing the throttle down so hard to get any go...

Try swapping them around and doing a ECU reset,


Hmm after checking, the 2x O2 sensors have different plugs so there's no way to get em around the wrong way.

Was hoping it was something that easy.

Cleaned MAF and reset ECU - still no joy.
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evilmrk1
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Soccer Mom
[ * ]
i have the same problems delayed throttle but i have 6 speed
:wacko:
RS200 6mt low n loud
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Leiden
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NZ, Whangarei
[ *  *  *  *  *  *  * ]
SilentOne,Apr 25 2010
03:01 PM
Leiden,Apr 25 2010
11:13 AM
Did you get the O2 sensors in the right bungs? 5AT's have two and if you got them around the wrong way it would mess with the Closed Loop part of the map, hence why your pressing the throttle down so hard to get any go...

Try swapping them around and doing a ECU reset,


Hmm after checking, the 2x O2 sensors have different plugs so there's no way to get em around the wrong way.

Was hoping it was something that easy.

Cleaned MAF and reset ECU - still no joy.

I mean't you put the O2 sensors in the wrong pipes, physically swap them over because each one does two banks of cylinders and fuel trims are based on those banks and if its trimming fuel on the wrong bank of cylinders its going to mess things up, for the ECU reset did you pull the EFI, ETCS, and ECU B1 fuses in the Relay box by the battery?
Project Thread
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SilentOne
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Leiden,Apr 25 2010
05:44 PM

I mean't you put the O2 sensors in the wrong pipes, physically swap them over because each one does two banks of cylinders and fuel trims are based on those banks and if its trimming fuel on the wrong bank of cylinders its going to mess things up, for the ECU reset did you pull the EFI, ETCS, and ECU B1 fuses in the Relay box by the battery?

Yup, all 3 fuses

Will try the physical swap (if I can manage to get em out!) - swapping the ball-joints at some stage this week so will do it then, don't think I'd be able to contort my arm + a spanner to get the 2nd sensor from the top.

Cheers for the info too btw
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AltezzaFanatic
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Stock
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Folks,
I have a similar problem.

My ride is 2003 3SGE 5AT. Recently my Cat convertor was leaking so I change the down pipe to RSR. header is stock. My low end torque is weak and at times while driving when I press the accelerator the engine hesitates for 2 seconds. My car is 100% stock with internal K&N. I have cleaned my MAF sensor and the throttle body. But still
no improvement. I don't mind the loss of low end torque cos my mid and top end has wild. The annoying part is the hesitation.

Appreciate if you can share if you have encountered similar issue.

I might look for used cat and put it back and sell of the RSR downpipe.

Maybe it is more suitable with a use of Apexi power FC for Turbo or supercharged.
2003 RS200 6MT.
Toda 268 Deg Cam.
K&N Panel Filter
Apexi Power FC EL Version
TRD Yellow ARB.
Endless Basic Rotors
Endless SS-Y Pads Front and Back.
Toda Power Lightweight Flywheel.
OZ Racing Ultraleggera 17x8 +48
HKS Silent Hi Power
FGK 4-2-1 Extractor and downpipe
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evilmrk1
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Soccer Mom
[ * ]
oh cat converter mine has been removed
RS200 6mt low n loud
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AltezzaFanatic
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Stock
[ *  * ]
Folks,
I want to check if my two O2 Sensor in the correct hole?.
The top most connector... if i follow the wire is attach to right hand pipe?
The bottom connector is attach to the left hand side of the pipe.

Is this correct.?

I took a picure but to large for me to load here.... :o
2003 RS200 6MT.
Toda 268 Deg Cam.
K&N Panel Filter
Apexi Power FC EL Version
TRD Yellow ARB.
Endless Basic Rotors
Endless SS-Y Pads Front and Back.
Toda Power Lightweight Flywheel.
OZ Racing Ultraleggera 17x8 +48
HKS Silent Hi Power
FGK 4-2-1 Extractor and downpipe
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SilentOne
Stock
[ *  *  * ]
OK common theme is the removal of the stock CAT, mine's an aftermarket hi-flo one.

Wonder how much the added back pressure is accounted for by the stock ECU? I didn't remove mine so I don't know if there was a sensor in it like in some other types of cars I've seen (ie dash light shows up when it's knackered)

AltezzaFanatic - by RSR do you mean resonator? Also, if you haven't changed the headers then there's little chance the sensors have been inserted in the wrong holes.

On that note the car still accelerates etc, there's just a delay that wasn't there before. I will check the sensors this week when I'm under the car but I don't think that's the issue based on your guys similar issues.



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AltezzaFanatic
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Hi SilentOne,
RSR is the brand of the downpipe.
I removed the Cat and installed a RSR downpipe. No modification need.
Direct bolt on. There is 2 hole in the downpipe for the O2 sensor.
My header is stock. Center Box is stock and rear muffler is also stock.
Now the only issue is sometime at low RPM when I accelerate there is a 2 second hesitation. Or when I a do brutal take off then yes there is hesitation in low rpm. Just wondering if anybody experience the same afer removing the cat.

Anyway going to the garage now to find out more. will update soon.

Posted Image
2003 RS200 6MT.
Toda 268 Deg Cam.
K&N Panel Filter
Apexi Power FC EL Version
TRD Yellow ARB.
Endless Basic Rotors
Endless SS-Y Pads Front and Back.
Toda Power Lightweight Flywheel.
OZ Racing Ultraleggera 17x8 +48
HKS Silent Hi Power
FGK 4-2-1 Extractor and downpipe
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SilentOne
Stock
[ *  *  * ]
AltezzaFanatic,Apr 26 2010
01:33 PM
Now the only issue is sometime at low RPM when I accelerate there is a 2 second hesitation. Or when I a do brutal take off then yes there is hesitation in low rpm. Just wondering if anybody experience the same afer removing the cat.

Anyway going to the garage now to find out more. will update soon.


Ah righto - I've always mis-associated down pipes with turbos so in that case, headers and down-pipe swapped on mine long with the CAT.

Anyways, exactly the same symptoms as mine in both situations.

Will post once I've had a play tomorrow night with the O2 Sensors.
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AltezzaFanatic
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Hi
Update. When to the tuner yesterday and nothing much can be done about the hesitation problem. Need to put back the cat.

Apparently later model ( 2002 model onwards use computer box no 89661-53161) doesnt adapt to modification well. I installed Dynoject Powercommander hoping it will
settle the hesitation but it did not help.

Anyway will dyno my car again after installing the cat back in the car. Previously stock managed to get 115KW on Ron 97 fuel.
Now with dynoject fuel controller hoping to raise it 10 more hp. fingers crossed.
2003 RS200 6MT.
Toda 268 Deg Cam.
K&N Panel Filter
Apexi Power FC EL Version
TRD Yellow ARB.
Endless Basic Rotors
Endless SS-Y Pads Front and Back.
Toda Power Lightweight Flywheel.
OZ Racing Ultraleggera 17x8 +48
HKS Silent Hi Power
FGK 4-2-1 Extractor and downpipe
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SilentOne
Stock
[ *  *  * ]
Hmm mine's a '99. Interesting the advice was to put the CAT back. To do with Back pressure then??

Also, the Dynoject - I thought they were just for bikes?
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