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The Terminator
Engine/Tuning
Throttle position sensor reads 19% at idle. What's going on?
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<blockquote data-quote="TheFleshRocket" data-source="post: 4503378" data-attributes="member: 48535"><p>I recently picked up an Auterra (<a href="http://www.auterraweb.com" target="_blank">www.auterraweb.com</a>) and have been using it to monitor my Cobra's vitals. All of the sensor readings seem to be accurate, with the exception of the throttle position sensor, which reads 19% when the car is at idle with my foot off the gas. When I accelerate, the throttle position climbs correspondingly. For example, when I'm cruising at 50 or 60mph, the TPS reads around 24-25%. At that point, I'm most likely at about a 5-6% throttle opening, so it appears accurate. The only thing inaccurate is the idle reading. (I haven't tried going WOT to see if it goes to 100% properly but will do that this afternoon.)</p><p></p><p>Drivability is fine for the most part, although the engine sometimes feels like it has a misfire at idle. I'm wondering if the inaccurate TPS reading is causing the ECU to inject too much fuel, possibly causing the misfire. And if it's injecting too much fuel at idle or part throttle as as result of the incorrect TPS reading, that's most likely hurting my gas mileage. </p><p></p><p>I have tested the Auterra on my GF's car and it accurately reads 0% from the TPS at idle, so I have no reason to suspect the Auterra is at fault.</p><p></p><p>My questions:</p><p></p><p>The car has a custom tune, but I'm assuming that the tune wouldn't try to fool the ECU by misreporting the throttle position. Is that a safe assumption?</p><p></p><p>Is the TPS adjustable? IE, is it possible that it is just installed a bit "off" and needs to be corrected?</p><p></p><p>I'm pretty sure that the previous owner had an Accufab throttle body installed at some point, so is it possible that he screwed up something with the TPS when he put the stocker back on?</p><p></p><p>Thanks everyone!</p></blockquote><p></p>
[QUOTE="TheFleshRocket, post: 4503378, member: 48535"] I recently picked up an Auterra ([url]www.auterraweb.com[/url]) and have been using it to monitor my Cobra's vitals. All of the sensor readings seem to be accurate, with the exception of the throttle position sensor, which reads 19% when the car is at idle with my foot off the gas. When I accelerate, the throttle position climbs correspondingly. For example, when I'm cruising at 50 or 60mph, the TPS reads around 24-25%. At that point, I'm most likely at about a 5-6% throttle opening, so it appears accurate. The only thing inaccurate is the idle reading. (I haven't tried going WOT to see if it goes to 100% properly but will do that this afternoon.) Drivability is fine for the most part, although the engine sometimes feels like it has a misfire at idle. I'm wondering if the inaccurate TPS reading is causing the ECU to inject too much fuel, possibly causing the misfire. And if it's injecting too much fuel at idle or part throttle as as result of the incorrect TPS reading, that's most likely hurting my gas mileage. I have tested the Auterra on my GF's car and it accurately reads 0% from the TPS at idle, so I have no reason to suspect the Auterra is at fault. My questions: The car has a custom tune, but I'm assuming that the tune wouldn't try to fool the ECU by misreporting the throttle position. Is that a safe assumption? Is the TPS adjustable? IE, is it possible that it is just installed a bit "off" and needs to be corrected? I'm pretty sure that the previous owner had an Accufab throttle body installed at some point, so is it possible that he screwed up something with the TPS when he put the stocker back on? Thanks everyone! [/QUOTE]
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Throttle position sensor reads 19% at idle. What's going on?
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