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EGR Systems
Ford Expedition XLT
Chevy El Camino

If the hose is pulled from the EGR valve on a 1987 El Camino and the hesitation and surging problem disappears is this proof that the EGR valve needs to be replaced?

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Wiki User
2015-07-16 18:21:09
2015-07-16 18:21:09

I would say so. The EGR operates directly with manifold vaccum so when they sick open they can kill the idle. The car will run fine without it hooked up as it only functions during warm-up for emissions.

You may all so have carbon biulded up under it.It happen to me on a 73 Nova

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I have the same problem, and there are a few sensors that do the same thing on vehicles now days. a bad tps sensor will cause: transmission shift issues, bucking, jerking, idle surging, engine cutoff, hesitation on take off, surge while cruising down highway. all of these symptoms do not have to be presant. a problem code does not light up if problem is not severe, even if codes do not come up you can still have a bad sensor. I have a 2000 Malibu 3.1, the tps is on side of throttle body at throttle plate, it is black and round, I believe the elec, connection has 3 wires!! take out 2 screws holding the tps in, pull off of throttle plate arm, when putting back on make sure you use a new o ring. when putting it on make sure that the throttle plate is closed. HOPE THIS HELPS, CARL

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