High Idle
Thread Starter
Newbie
Joined: Dec 2008
Posts: 31
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From: hawaii
High Idle
Hi,
My name's Gary and I've been a lurker here for the past year and a half or so now. I got my Evo 8 back in December of 2009. It already had GSC cams, 3" piping from the downpipe back with cat delete, HKS RS intake, and a street tune from Dynoflash. EvoM has saved me a few times and helps me to learn about and love my car more and more.
This is where the problem starts. I had just replaced my throttle body shaft seals yesterday with the ones from Works and cleaned out the entire throttle body also. I had reinstalled the spring and TPS everything back to the original positions before removal. After reinstalling everything, I turned on the car and drove it around or a bit. Everything seemed fine. Idle was were it was supposed to be (apparently, Al from Dynoflash had set the car to idle are 1020/1030 RPM during the tune to even out the idle due to the aftermarket cams), oil pressure, temp, everything was fine and running properly.
Later that evening, after browsing through this forum, I decide to put my new found knowledge to use and check the positioning of the TPS. I used the multimeter and checked the voltage to the TPS and saw that it was reading 0.47v. I saw that factory specs are supposed to be between 0.535v-0.735v, so I adjusted it till it read 0.58v. I had unplugged the battery afterwards to mess around with my stereo. After I'm done, I reconnect the battery and leave it for the night.
This morning, when i start up the car and let it warm up everything seemed fine, and the idle seemed normal. After I start driving it around, the idle starts to rise. I notice something wrong so look and see that the car idles between 1230RPM and 1540RPM. I have a feeling that this problem is due to me messing with the TPS, but what I don't understand is why this is happening when i set it so that it was within factory specs.
Will it stay like this or is there some type of learning curve for the ECU where it takes some time to relearn the proper idle speed? Or should i just put the TPS back to the original position even though the voltage reading to it is lower than what the factory manual says? I've driven for about 25 miles since this started happening now. But it's still the same. Thanks for looking and sorry about the long essay.
My name's Gary and I've been a lurker here for the past year and a half or so now. I got my Evo 8 back in December of 2009. It already had GSC cams, 3" piping from the downpipe back with cat delete, HKS RS intake, and a street tune from Dynoflash. EvoM has saved me a few times and helps me to learn about and love my car more and more.
This is where the problem starts. I had just replaced my throttle body shaft seals yesterday with the ones from Works and cleaned out the entire throttle body also. I had reinstalled the spring and TPS everything back to the original positions before removal. After reinstalling everything, I turned on the car and drove it around or a bit. Everything seemed fine. Idle was were it was supposed to be (apparently, Al from Dynoflash had set the car to idle are 1020/1030 RPM during the tune to even out the idle due to the aftermarket cams), oil pressure, temp, everything was fine and running properly.
Later that evening, after browsing through this forum, I decide to put my new found knowledge to use and check the positioning of the TPS. I used the multimeter and checked the voltage to the TPS and saw that it was reading 0.47v. I saw that factory specs are supposed to be between 0.535v-0.735v, so I adjusted it till it read 0.58v. I had unplugged the battery afterwards to mess around with my stereo. After I'm done, I reconnect the battery and leave it for the night.
This morning, when i start up the car and let it warm up everything seemed fine, and the idle seemed normal. After I start driving it around, the idle starts to rise. I notice something wrong so look and see that the car idles between 1230RPM and 1540RPM. I have a feeling that this problem is due to me messing with the TPS, but what I don't understand is why this is happening when i set it so that it was within factory specs.
Will it stay like this or is there some type of learning curve for the ECU where it takes some time to relearn the proper idle speed? Or should i just put the TPS back to the original position even though the voltage reading to it is lower than what the factory manual says? I've driven for about 25 miles since this started happening now. But it's still the same. Thanks for looking and sorry about the long essay.
Thread Starter
Newbie
Joined: Dec 2008
Posts: 31
Likes: 0
From: hawaii
Damn! I totally forgot about that because i remember reading on here not to mess around with that. Can't remember the reason why... silly me. Well, i just did that and lowered the idle. I originally had it idling with it jumping between 980 and 1030 (with an occasional drop to about 920) and it ran fine, but noticed my oil pressure gauge reading had dropped to about 12psi so i messed with the idle a little more till i got it to idle between 1020 to about 1080 sometimes, and my oil pressure gauge reading was at 14psi. Does this sound ok? sorry about the noob questions...
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