Cant Wont Accelerate past 3000rpms

PKRWUD · 09-10-2001, 06:04 PM

5ohCOUPE-
You are very lucky if you haven't experienced any problems yet, but you will. The ECM uses the TPS voltage to understand many things, including driver intent. When the TPS reaches 1 volt, the ECM believes you are no longer sitting at idle, but are attempting to drive. It will make adjustments trying to compensate for this, which will give you an unstable idle rpm and mixture. This will lead to eventual clogging of the cats, dilution of the oil, and accelerated wear and tear. I'm not sure where you bought your car, but I have never seen a factory TPS spec at .997 vdc. It's way too close to 1 volt, and as the TPS starts to wear, it will reach 1 volt. There was a popular rumor that ran around for a while in which the thinking was that the closer you could get your TPS to 1 volt, the snappier your throttle response would be. This is based in truth, but exagerated. There is not a human alive that can tell the difference in throttle responsiveness when the TPS is set at .95 vs. .999. In fact, 5.0 MA SEFI Mustangs have a minimum setting of .39 vdc, and a recommended setting of .601 (+/- 3%).

Obviously, you can set yours however you like, but why risk the trouble for no gain???

Take care
~Chris

------------------
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MustangNet

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09-10-2001, 06:04 PM	#20
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	5ohCOUPE- You are very lucky if you haven't experienced any problems yet, but you will. The ECM uses the TPS voltage to understand many things, including driver intent. When the TPS reaches 1 volt, the ECM believes you are no longer sitting at idle, but are attempting to drive. It will make adjustments trying to compensate for this, which will give you an unstable idle rpm and mixture. This will lead to eventual clogging of the cats, dilution of the oil, and accelerated wear and tear. I'm not sure where you bought your car, but I have never seen a factory TPS spec at .997 vdc. It's way too close to 1 volt, and as the TPS starts to wear, it will reach 1 volt. There was a popular rumor that ran around for a while in which the thinking was that the closer you could get your TPS to 1 volt, the snappier your throttle response would be. This is based in truth, but exagerated. There is not a human alive that can tell the difference in throttle responsiveness when the TPS is set at .95 vs. .999. In fact, 5.0 MA SEFI Mustangs have a minimum setting of .39 vdc, and a recommended setting of .601 (+/- 3%). Obviously, you can set yours however you like, but why risk the trouble for no gain??? Take care ~Chris ------------------ Retired Moderator MustangNet My site: JimPorterRacing RACECAR spelled backwards is RACECAR HEY !!! Are you ASE Certified ??? If you are, ask me about iATN. The best tool you'll ever have, and it's free !!!