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Mach 1
03 mach 1 chasing idle surge gremlins...
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<blockquote data-quote="texas_snake" data-source="post: 15929071" data-attributes="member: 11539"><p>Found the issue!!!</p><p></p><p>May not be the last one, but at 75k miles, this factory throttle body is shot. When I cleaned it I could see pitting and the surface could just not fully clean. And I had noticed the plates seemed more open than normal. Remember I just bought this 1 month ago and I knew it had a high idle issue. Recently I found the throttle plate screw had been advanced quite a bit. I set it back and was having a worse issue with high idle (really became undrive-able for safety). It was also running lean at idle with long trim stats. Today started it and had the issue right off the bat (normally seemed more when warm).</p><p></p><p>So I decided to get out and press on the throttle in the direction of closed. idle came right down. Rev hard, no issue, rev light, high idle. Sooo........... the issue is a sticking throttle plate (100% certain). When gentle throttle, it does not return to the setting most of the time and can be as high as 3k. When hard throttle it mostly returns/snaps back. This also explains why the genius before me turned up the screw. They tried to avoid the sticking at the last part of throttle travel. But in doing that, they threw off the IAC and computer control and it drove with hesitation and stick would stick sometimes. A/C on only slight improved the idle coming down.</p><p></p><p>So I am ordering a new throttle body. Sadly 2 weeks back I suspected the throttle body, but only from inspecting it. Did not think it was sticking, but now proved it. I even tested it with the gas pedal and cruise disconnected since it has the zip tie mod on the gas pedal. But still sticks. So this is my issue. Hoping this is the last problem for the throttle response. So far new mass air (1 of the 2 screws was broken off) and now new throttle body. </p><p></p><p>Fingers crossed I am done...</p></blockquote><p></p>
[QUOTE="texas_snake, post: 15929071, member: 11539"] Found the issue!!! May not be the last one, but at 75k miles, this factory throttle body is shot. When I cleaned it I could see pitting and the surface could just not fully clean. And I had noticed the plates seemed more open than normal. Remember I just bought this 1 month ago and I knew it had a high idle issue. Recently I found the throttle plate screw had been advanced quite a bit. I set it back and was having a worse issue with high idle (really became undrive-able for safety). It was also running lean at idle with long trim stats. Today started it and had the issue right off the bat (normally seemed more when warm). So I decided to get out and press on the throttle in the direction of closed. idle came right down. Rev hard, no issue, rev light, high idle. Sooo........... the issue is a sticking throttle plate (100% certain). When gentle throttle, it does not return to the setting most of the time and can be as high as 3k. When hard throttle it mostly returns/snaps back. This also explains why the genius before me turned up the screw. They tried to avoid the sticking at the last part of throttle travel. But in doing that, they threw off the IAC and computer control and it drove with hesitation and stick would stick sometimes. A/C on only slight improved the idle coming down. So I am ordering a new throttle body. Sadly 2 weeks back I suspected the throttle body, but only from inspecting it. Did not think it was sticking, but now proved it. I even tested it with the gas pedal and cruise disconnected since it has the zip tie mod on the gas pedal. But still sticks. So this is my issue. Hoping this is the last problem for the throttle response. So far new mass air (1 of the 2 screws was broken off) and now new throttle body. Fingers crossed I am done... [/QUOTE]
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03 mach 1 chasing idle surge gremlins...
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