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Car surges at speeds above 40 mph check engine light on changed camshaft sensor and crank sensor

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  • 2,019 Answers

If the engine light is on, that means there is a code waiting to be read. Let a place like Autozone tell you what the code is.

But surging means a fuel problem, and probably too lean.
A weak pump is one possibility, so you can check pressure with a gauge.
Another possibility is a sensor is bad.
There are air mass, air temperature, engine temperature, throttle position, oxygen, etc., sensors.
They can all be checked with an ohmmeter, and while methods vary, bad ones usually are 0 or infinite ohms.
Air mass and oxygen sensors can get coated and need cleaning.

Posted on Aug 29, 2010

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Posted on Jan 02, 2017

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