somehow when i set the TPS to .5v at close throttle the motor starts up and dies quickly... the lowest i can set the tps at close throttle is .7v ..... the WOT is at 4.5v which i think it's normal.... what do u guys think it could be? this is on a stock internal b20v with upgraded TB,manifold, and header... and it's running on a p28 chipped ecu and i dont know what program.

 

bump for some answers

 

How does it act at .7v closed?

 

Sounds like the idle screw isnt screwed out all the way, try that

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by gibsanez &raquo;</TD></TR><TR><TD CLASS="quote">How does it act at .7v closed?</TD></TR></TABLE>

it idles around 700-750 rpm with a bog... kinda like backfiring...

 

bump for help!!

 

i'm having a similar problem
do you have a little bog when you give little hits of gas, and do you find your car backfires and runs a little rich?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 97coupecivic &raquo;</TD></TR><TR><TD CLASS="quote">i'm having a similar problem
do you have a little bog when you give little hits of gas, and do you find your car backfires and runs a little rich?
</TD></TR></TABLE>

that is the same exact problem im having!!! if i give it a little tap of gas from the pedal, it bogs, and when i try to keep a steady rpm say like 2500rpm i hear it backfiring, and i smell gas rich buring from the tip of my exhaust pipe!!

I also have been trying to adjust the TPS back and forth with no luck, where ever i set the Volts at on the TPS it doesnt stop the bogging or backfiring... the idle on this motor is not all that good too!! it stays right at 700-800rpm but keeps on going from 700-800 like it's having hard time idling, if i rev it up to like 2000rpm or so, it falls back down pass 600rpm like it's going to die before the rpm goes back up! I want to dyno tune the motor but im not sure if it's gonna fix this problem....

Somebody Help!!

 

.62v Closed throttle


4.55v WOT

this is how the motor idles on normal operating temperature and the TPS is set to .62v closed and 4.55v WOT... I also tryed .5v closed still idles the same as the .62v closed....


BTW, i am using a 94 civic CX OEM TPS sensor on the Professinal product 68mm tb

 

when I set TPS's I only focus on being exactly 4.50v at WOT. Far as I can tell, the ECU is fine with lower than 0.5 closed because 3 of my cars were lower than that out of the factory.

If you're having a bog, I would guess there's an airflow problem. Make sure your idle screw is where it should be and that your fuel system can keep up with all the extra air a 68mm TB lets in.

 

[QUOTE=kalm_traveler] Far as I can tell, the ECU is fine with lower than 0.5 closed because 3 of my cars were lower than that out of the factory.
QUOTE]

what about if it's at .6v closed?? will the ecu still be okay with it?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kalm_traveler &raquo;</TD></TR><TR><TD CLASS="quote">

If you're having a bog, I would guess there's an airflow problem. Make sure your idle screw is where it should be and that your fuel system can keep up with all the extra air a 68mm TB lets in. </TD></TR></TABLE>

My idle screw is all the way closed, i am running a GSR fuel pump and obd2 b20b fuel injectors.... do u guys think a dyno tune will solve this problem??

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b20vtech &raquo;</TD></TR><TR><TD CLASS="quote">
what about if it's at .6v closed?? will the ecu still be okay with it?</TD></TR></TABLE>
If that's where you need to be for normal idle speed then you're fine. A Civic I tested OEM was at like 0.38v so .6 isn't that surprising.

I thought about this some more and a bog would be too much fuel, not air. A tune may be exactly what you need. How's your timing?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kalm_traveler &raquo;</TD></TR><TR><TD CLASS="quote">


I thought about this some more and a bog would be too much fuel, not air. A tune may be exactly what you need. How's your timing? </TD></TR></TABLE>

it smells rich from my exhaust. Timming is a little off on the Intake cam(retard), i think it's due to the head being resurfaced before.