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Need some help with my 4.3 CPI
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<blockquote data-quote="ain&#039;tstuckjustresting" data-source="post: 1434594" data-attributes="member: 18302"><p>I did the procedure as stated, jumping the aldl, key on, unplug IAC, key off, remove jumper, start engine.</p><p></p><p>This is a bolt in IAC. The pattern is just a hair different that the TBI manifold I have in the shed so I don't think you can screw it up.</p><p></p><p></p><p>So this is what I tried: I created a metered vacuum leak (Booster line and clamp) and closed it down to achive the lowest smooth idle w/o surging (about 900rpms). I put my finger over the IAC port and can't feel any vaccum so the pintle must have closed. I open the throttle a bit and can feel the IAC start to pull vacuum on my finger. It must be reacting to the TPS command and allowing more air in to increase rpm. If I continue to block the IAC port with my finger and open the throttle more it will pull even harder through the IAC port. In a correctly operating system this is what you would expect right?</p><p></p><p>So now I guess I need to figure out why the hell so much fuel is being commanded at idle. I don't think the IAC can add enough air to keep it running w/o the idle reving up. As soon as the idle increases the IAC trys to get back to base rpms and the engine floods. :scratchhead:</p></blockquote><p></p>
[QUOTE="ain'tstuckjustresting, post: 1434594, member: 18302"] I did the procedure as stated, jumping the aldl, key on, unplug IAC, key off, remove jumper, start engine. This is a bolt in IAC. The pattern is just a hair different that the TBI manifold I have in the shed so I don't think you can screw it up. So this is what I tried: I created a metered vacuum leak (Booster line and clamp) and closed it down to achive the lowest smooth idle w/o surging (about 900rpms). I put my finger over the IAC port and can't feel any vaccum so the pintle must have closed. I open the throttle a bit and can feel the IAC start to pull vacuum on my finger. It must be reacting to the TPS command and allowing more air in to increase rpm. If I continue to block the IAC port with my finger and open the throttle more it will pull even harder through the IAC port. In a correctly operating system this is what you would expect right? So now I guess I need to figure out why the hell so much fuel is being commanded at idle. I don't think the IAC can add enough air to keep it running w/o the idle reving up. As soon as the idle increases the IAC trys to get back to base rpms and the engine floods. :scratchhead: [/QUOTE]
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Need some help with my 4.3 CPI
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