TPS and timing

[einherjar]

Hi,

When i drive with the TPS unplugged, the car drives great, but when i plug it in, the timing seems off, car is underpowered, small backfires as it revs down. I dont want to play with the timing, will the ECU eventually compensate and adjust timing with the TPS pluged in?
Things to note: I have just replaced the TPS because the old one was broken, and i adjusted it to 0.450v at idle.

If i do have to play with the timing, is there anything wrong with the method of adjusting timing by setting to TDC, removing valve cover and re aligning CAMS? , or even easier, rotate CAMS until she feels normal again?

[Flybert]

Adjusting base timing by rotating the cams? Where did you learn that? If you want to adjust your base timing by popping the valve cover, you need to do this. http://www.store.yahoo.com/phase2motorsports/howtosetcaso.html

I'd double check it by checking the timing with a timing light afterwards. Read the FSM on how to do it that way. Shit, even the method above is in the FSM.

Read your FSM next time or do a search.

[einherjar]

double ouch, yes i read the FSM, yes i searched quite extensively, and i found the phase 2 motortrend way, but i also found countless others mentioning to do like phase 2 then bust out a timing light and use it aswell. I do not have a timing light, nor have riged up a setup to use it on the coil packs of the SR, so i was asking if there was anything wrong with just removing the valve cover and doing it that way. And yes you can adjust the timing by rotating the CAMS, lots of people frown on this because its not exact, but again, asking if there was anything really bad about it.

But anyways, the main part of my post was regarding the ECU, the TPS and the computer adjusting timing. Why is my timing fine when the TPS is unplugged, and then goes off when unplugged, obviously the ECU is doing something, but should i keep driving around till it fixes, or do i need to adjust my base timing. Ive tried resetting the ECU, but no dice. ... fuck it, ill just check the timing, if that doesnt fix it, ill drive around till its fixed.

[ledzeppelin240]

First of all you don't adjuct the TPS voltage. You adjust the idle switch otherwise you engine does not know when to control the idle. When the TPS is unplugged the ECU really does't know what is going on, and when it is plugged in you idle switch is set wrong so it doesn't return to base timing...

You need to set the idle switch to come on between 850 & 1150RPM with an Ohm meter. Then adjust your idle to spec, and then adjust you timing.