adjusted tps sensor and idles better, car still backfires and struggles at wot..

[dwnshfter]

ok, so i loosened the TPS sensor and twisted it a little and now it idles better. it doesnt die, but it doesnt seem perfect. in first at wot it kinda flatlines before it should. like it just gets into boost and then WHAM!, no power errrrrrr. 2nd is a lot better but still cuts out, and third on up no issues. i ran a can of seafoam through and noticed nothing. i did run it in the fuel cell, and not the brake booster. i will list my mods in the sig in just a few moments. could the TPS be the problem still, or is there something else? i just replaced the spark plugs a few days ago and the old ones were pretty bad, and it runs a lot better with that done.....any help is appreciated.
Modified by dwnshfter at 3:01 PM 9/15/2008

[Minuszero]

do you have a safc neo or any kind of piggy back?

[Kansei240sx]

Go look at the FSM, read how it says you're supposed to adjust the TPS instead of just jumping in blind, you'll never fix anything with those style of methods.

[dwnshfter]

do you have a safc neo or any kind of piggy back?

no, just the rb ecu.....i have a megasquirt 2, but bought it second hand and dopnt know how to install it....

[dwnshfter]

Go look at the FSM, read how it says you're supposed to adjust the TPS instead of just jumping in blind, you'll never fix anything with those style of methods.

well i know that your supposed to do it with a volt meter, but mine is packed away cause i just moved here a few days ago, and this way was better than nothing.

[kevwa]

i know this wont help you now - but i just got my MegaSquirt2 so i will be starting to build it and install this semester at school - so i could probably help you out with yours if you still were going to use it

[dwnshfter]

i would LOVE to use it, but the guy i bought it from was kinda shady and owed me money and thats the only reason i took it. i know NOTHING about it.

[kevwa]

well i am actually just starting soldering components to the board tonight so its going to be a while before its done - anyway if you are serious about using it check out these sites and start reading up on it.

http://www.diyautotune.com http://www.megamanual.com

also if you give me your email i will forward you an email between myself and Matt - one of the tech guys from DIYautotune

[Joe]

well i know that your supposed to do it with a volt meter, but mine is packed away cause i just moved here a few days ago, and this way was better than nothing.

wow. brilliant.

do you set your timing by feel too?

jesus christ...

[240z4u]

wow. brilliant.

do you set your timing by feel too?

jesus christ...

I set my timing by blinking my eyes as fast as I can.

[Kansei240sx]

I set my timing by blinking my eyes as fast as I can.

lmao

[dwnshfter]

is the tps that sensitive? i will go dig out my volt meter if its that big a deal. how exatrcly do i set it?

[kevwa]

with the ignition on, back probe the signal wire and it should read .45 volts with the throttle closed i believe

[dwnshfter]

what is back probing? i assume it will read higher or lower depending on where it sits.....is that right? so just twist it till it sits at .45V?

[Joe]

.4-.5 volts is acceptable, as long as it reads 4.5v+ at WOT

backprobing is the method of getting voltage at a plug by sticking something in the connector from the backside (like a pin, paperclip, etc) alongside the wire.

[dwnshfter]

so i want it to read .4-.5 at WOT not closed? so just have a friend hold it full open while i read right? and have him twist it a little at a time till it sit perfect?

[dwnshfter]

another problem i am having is after i turn the car off and pull out the key it still runs for about 5 seconds, kinda like a turbo timer, but i dont have it installed yet. do i need to replace the FPR, or what? is my T-Rex pump to much for the stocker? usually i just rev it a little and it stops faster.

[kevwa]

at WOT it should read 4.5 volts, in order for it to read 4.5 volts at WOT it will read somewhere between .4 and .5 volts at closed throttle. hope that clears it up for you

[dwnshfter]

ahhh, that makes it MUCH better, lol. so basically it's only changing when throttle is applied. which wire do i test this on?

[kevwa]

im not sure what the wires are on yours - i have an RB25 - but you should have 3 wires: 1 will be reference voltage of 5V, 1 will be ground, and then 1 will be the signal - so its really easy to figure out which wire is the signal

[dwnshfter]

awesome, any insight on the running after key removed issue?