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trop-a-cal's avatar
trop-a-cal
Explorer
Oct 20, 2013

1997 454 GM vortec motor problem with EGR Valve

I noticed the idle down lower than normal and a weak start. Then a pinging, and loss of power after a full up when tank was almost empty. I was told the exhaust system has a valve, that recycles exhau...
ScottG's avatar
ScottG
Nomad
Oct 20, 2013
Those are classic EGR failure symptoms.
Sometime when it's acting up, unplug the vacuum line to the EGR valve and cap it off - you might have to tap on it a few times to make it seat properly. If it runs fine after that then you've found your culprit. Don't leave it that way too long though as it will cause detonation you may not hear esp on hills.

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