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SN95 Cobras
advice? ping/thermostat
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<blockquote data-quote="RED 97 COBRA" data-source="post: 6529466" data-attributes="member: 26719"><p>Check the egr valve and it's vacuum lines. The black cap on the egr vacuum control solenoid pops off and there is a foam sponge filter inside. This filter gets plugged with dirt and prevents the valve from equlizing internaly so it can close when not in use. This can cause the egr valve to hang open slightly. This will allow exhaust gas to recirculate into the engine when it is not supose to and build carbon deposits on the valve further agrivation the situation. This can can a lean misfire condition. Since egr is inert the O2 sensors can't read the displaced oxygen condition and the computer reacts by leaning out the a/f ratio. </p><p></p><p>Just something else that can be a problem area on these engines.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="RED 97 COBRA, post: 6529466, member: 26719"] Check the egr valve and it's vacuum lines. The black cap on the egr vacuum control solenoid pops off and there is a foam sponge filter inside. This filter gets plugged with dirt and prevents the valve from equlizing internaly so it can close when not in use. This can cause the egr valve to hang open slightly. This will allow exhaust gas to recirculate into the engine when it is not supose to and build carbon deposits on the valve further agrivation the situation. This can can a lean misfire condition. Since egr is inert the O2 sensors can't read the displaced oxygen condition and the computer reacts by leaning out the a/f ratio. Just something else that can be a problem area on these engines. David [/QUOTE]
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