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starting problem
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<blockquote data-quote="mwolson" data-source="post: 14147406" data-attributes="member: 16006"><p>Idle is like balancing on a knife edge. It can be really tricky to get right, and you can easily screw it up. Most people don't realize that the PCM uses the IACV to do coarse control of idle but it uses spark to do fine control of idle. When they start changing idle air, due to leaks and/or changing the throttle stop screw, it can really throw the idle off.</p><p></p><p>If there are no other issues, you can change the throttle stop screw some and it won't throw off your idle, but your IACV will not have the range it has with the stock setting. You can see that in the datalogs for the IACV duty cycle. If it gets lower than 30-35%, it can't cut down on air flow to slow things down. if it gets higher than 35%, it has less headroom for speeding things up.</p><p></p><p>Encased may be right, and you may get lucky and get your idle to work, but if not, you will need to get access the right tools to get this set up right.</p><p></p><p>You need access to an SCT handheld or a scanner in order to datalog the things you are trying to fix. I know how to do it with SCT, but have not used a scanner. If you know anyone with an SCT handheld, and they will let you use it, download Livelink from SCT's website and you can datalog all the parameters you will need.</p><p></p><p>If not, maybe you can find someone local with a scanner who can help you.</p></blockquote><p></p>
[QUOTE="mwolson, post: 14147406, member: 16006"] Idle is like balancing on a knife edge. It can be really tricky to get right, and you can easily screw it up. Most people don't realize that the PCM uses the IACV to do coarse control of idle but it uses spark to do fine control of idle. When they start changing idle air, due to leaks and/or changing the throttle stop screw, it can really throw the idle off. If there are no other issues, you can change the throttle stop screw some and it won't throw off your idle, but your IACV will not have the range it has with the stock setting. You can see that in the datalogs for the IACV duty cycle. If it gets lower than 30-35%, it can't cut down on air flow to slow things down. if it gets higher than 35%, it has less headroom for speeding things up. Encased may be right, and you may get lucky and get your idle to work, but if not, you will need to get access the right tools to get this set up right. You need access to an SCT handheld or a scanner in order to datalog the things you are trying to fix. I know how to do it with SCT, but have not used a scanner. If you know anyone with an SCT handheld, and they will let you use it, download Livelink from SCT's website and you can datalog all the parameters you will need. If not, maybe you can find someone local with a scanner who can help you. [/QUOTE]
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