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Why does the engine run better when you unplug the egr solenoid on your 1991 gmc ck1500 5.7 tbi and is this harmful?
Wiki User
∙ 12y ago
EGR valve is probably all clogged up with carbon so an incorrect amount of exhast gas is being mixed in, you could try taking it off cleaning the ports of excess carbon then giving a good shot of WD40 into the vacumn port and manifold of the EGR valve, ya know, just clean it up good and make sure the diaphragm moves freely. Worked for me once on an 88 Dodge Aries, idled rough so I cleaned the EGR valve up and reinstalled it, car idled perfectly afterwards.
The downside of disconnecting the EGR valve is higher emissions and a small drop in fuel economy.
Wiki User
∙ 12y ago
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