Re: 98 900s - fires...but no start - followup - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: 98 900s - fires...but no start - followup
Posted by Dean [Email] (more from Dean) on Mon, 27 Feb 2006 12:32:48
In Reply to: Re: 98 900s - fires...but no start - followup, Erik Karlsson, Mon, 27 Feb 2006 08:36:47
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No cold start injectors. The ECU controls cold start mixture and increases air flow via the idle air control valve (IAC). The IAC can get hard deposits that can be removed with carb cleaner. Search for "clean IAC" to get details.
A badly fouled IAC can stick and then air flow is incorrect. When cleaning the IAC, also clean the TB bore. With the non-turbo engine, you need to remove the plastic intake plenum to access the IAC. Be careful not to strain the PVC nylon plastic TEE that goes into the valve cover. They get very brittle with time.
Clean injectors with Techron Concentrate and pull the plugs, read the deposits and check/reset the gap or replace.
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