What do I set the TPS to for CFI engine? December 20, 2005, 10:37:16 PM I've been through my references and haven't found any actual run-through as to how to set the TPS in a CFI car.Haynes - You are too stupid to set the TPSChilton/Probst - Here is how to set the idle speed...Jumper STI to STOKey to RUNKey OFFRemove jumperSet TSAS clearance to .005"Turn TSAS 1.5 turns inAdjust ISC bracket so that 9/32" spacer passes between the throttle blade and TPSThere is a TSB stating to set the space at 7/32" instead 9/32"What I haven't read it what to set the TPS to.MPI cars use an ISC that doesn't change the throttle blade to moderate idle. The EEC uses 1.00V as the set-point between open and closed throttle. '94/95 SN95 EECs use whatever voltage there is on start-up to determine open/closed voltage. Quote Selected
What do I set the TPS to for CFI engine? Reply #1 – December 20, 2005, 10:56:42 PM .95v to 1.0v should be just fine. Quote Selected
What do I set the TPS to for CFI engine? Reply #2 – December 20, 2005, 11:06:24 PM Quote from: SLEEPER T-BIRD 87.95v to 1.0v should be just fine.At Key ON...running warm idle? cold idle? in park/drive?How does a CFI EEC determine open/closed throttle? Turning on the A/C and loading it will change the TPS reading while keeping the idle speed the same. Quote Selected
What do I set the TPS to for CFI engine? Reply #3 – December 20, 2005, 11:47:40 PM Quote from: JeremyBAt Key ON...running warm idle? cold idle? in park/drive?How does a CFI EEC determine open/closed throttle? Turning on the A/C and loading it will change the TPS reading while keeping the idle speed the same.koeo Quote Selected
What do I set the TPS to for CFI engine? Reply #4 – December 21, 2005, 12:27:14 PM .97 is the recomended so i have read. Quote Selected
What do I set the TPS to for CFI engine? Reply #5 – December 21, 2005, 12:38:49 PM INMO the whole TPS thing is blown out of porportion. As long as it does not exceed 1v at idle, where it's set makes little to no difference... I've played with mine and initally it does make some slight differences in idle, but as soon as the EEC relarns the setting it resets the A/F ratio to whats programmed for best emissions. MM&FF tried the .99999v setting at the race track and came up with nothing, of course the answer was.... but we know it works.... Quote Selected
What do I set the TPS to for CFI engine? Reply #6 – December 24, 2005, 12:52:27 AM According to the '84 shop manual the TPS itself is "not ajustable"KOEO test retracts the ISC and checks the TPS voltage with the linkage against the TSAS.If the TSAS adjustment is correct the TPS is supposed to be correct.However what I have seen is that replacement TPS's are not made to tight enough tolerances.I have a NAPA TPS that gives a KOEO code 23.The voltage between the black and green wires was .68v. too low to pass the KOEO test.The OEM TPS voltage is .8vThe resistance black to green is 640 ohms for both TPS's but overall resistance black to orange is, OEM 3.60k and NAPA 3.81k.Since it is a voltage divider you have a larger voltage across the OEM 640 ohms than you do across the NAPA 640 ohms.I believe this is why people have to file out the mounting holes to make them adjustable.Not sure how high the voltage can go before it fails the test.The voltage and resistance numbers are from some very cryptic notes of mine from several years ago but I think they are right. Quote Selected
What do I set the TPS to for CFI engine? Reply #7 – December 24, 2005, 11:25:54 AM Quote from: softtouch.I have a NAPA TPS that give a KOEO code 23.The voltage between the black and green wires was .68v. too low to pass the KOEO test.The OEM TPS voltage is .8vThe resistance black to green is 640 ohms for both TPS's but overall resistance black to orange is, OEM 3.60k and NAPA 3.81k.Since it is a voltage divider you have a larger voltage across the OEM 640 ohms than you do across the NAPA 640 ohms.Yea supposidly same sensors from different vendors do have different charistics...I am suprised yo got a code at .68v, as I've run mine down to .5 and never set a 23.... Maybe some EEC are more tolarent of different settings... Quote Selected
What do I set the TPS to for CFI engine? Reply #8 – December 24, 2005, 05:48:09 PM I checked mine between the green and black wires and not green and some other ground. With such small voltages this may make the difference. Mine will code below .75 and I don't know the high limit.Some seem to think being in the high end of the range is best. I don't know why they think that.I think if KOEO runs without a TPS code it's ok. Quote Selected
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