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  1. #1
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    Default Engin surge at idle

    My 98 C5 has just started a slight engine surge when idling and when slowing down approaching stop lights, etc, A very slight increase followed by decrease in rpm. Engine runs fine otherwise. Does this sound like a throttle position sensor problem? Any advise appreciated. Thanks.

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    Member LLC5's Avatar
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    Quote Originally Posted by wholmes98 View Post
    My 98 C5 has just started a slight engine surge when idling and when slowing down approaching stop lights, etc, A very slight increase followed by decrease in rpm. Engine runs fine otherwise. Does this sound like a throttle position sensor problem? Any advise appreciated. Thanks.


    Not really, that will usually set a code and turn on the CEL. Check your DIC for any stored codes. It could be false air (vacuum leak) entering the intake. Common areas are the pcv hose by the right valve cover, also check for any rodent damage in the engine bay, even if garaged.
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    Quote Originally Posted by LLC5 View Post
    Not really, that will usually set a code and turn on the CEL. Check your DIC for any stored codes. It could be false air (vacuum leak) entering the intake. Common areas are the pcv hose by the right valve cover, also check for any rodent damage in the engine bay, even if garaged.
    Had that with the PCV hose coming from the right valve cover on my 99. Good advice.

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