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Stern90LX · 05-03-2008, 07:58 PM

*sigh* Sorry, I can longer lurk on these forums, I have to comment on this subject.

Why do people keep doing write up's on this subject that outline adjusting the TPS? Measure it's voltage at idle, if it's between .7 and 1.0 vdc the computers happy with it and all is well with it. It [the EEC-IV] is self adjusting for all intents and purposes, it'll adapt unless it is outside that range.

Also 99% of surging idle issues happen after airflow has been increased(anything from adding a bigger MAF, TB, heads, intake, or cam). There is a point were the EEC-IV simply cannot adapt to the increased air-flow. The other 1% is a Vac leak or a failed sensor.

Guess what, the correct answer is to fix the EEC-IV and make it understand there is more air flow now via the "Thottle Body Air Flow" Scalar, it's measured in Kg/Hr. Increase it in .1 intervals until the surge goes away. And while your at it input the correct MAF Transfer Tables and the Injector Slope High and Low values(= to injector rating +/- .25)
Everything else is quick and dirty fix which tricks the computer at best. So stop screwing around with these hoaky fixes and FIX the cause, not the symptoms with an EEC-IV tuner. If you wanna play with big EFI horse power parts your gunna have to pay.

05-03-2008, 07:58 PM	#5
Stern90LX Join Date: Sep 2006 Posts: 11	RE: Surging idle sticky!!!! Here it is!!! sigh Sorry, I can longer lurk on these forums, I have to comment on this subject. Why do people keep doing write up's on this subject that outline adjusting the TPS? Measure it's voltage at idle, if it's between .7 and 1.0 vdc the computers happy with it and all is well with it. It [the EEC-IV] is self adjusting for all intents and purposes, it'll adapt unless it is outside that range. Also 99% of surging idle issues happen after airflow has been increased(anything from adding a bigger MAF, TB, heads, intake, or cam). There is a point were the EEC-IV simply cannot adapt to the increased air-flow. The other 1% is a Vac leak or a failed sensor. Guess what, the correct answer is to fix the EEC-IV and make it understand there is more air flow now via the "Thottle Body Air Flow" Scalar, it's measured in Kg/Hr. Increase it in .1 intervals until the surge goes away. And while your at it input the correct MAF Transfer Tables and the Injector Slope High and Low values(= to injector rating +/- .25) Everything else is quick and dirty fix which tricks the computer at best. So stop screwing around with these hoaky fixes and FIX the cause, not the symptoms with an EEC-IV tuner. If you wanna play with big EFI horse power parts your gunna have to pay.