The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Terrible idle, difficult start, and smoke!

geezer#99 · 10-20-2016, 02:05 PM

Too high up for head gasket.
Look in the rad when it's idling and look for bubbles. That's how to tell if it's a head gasket.

Also your coolant temp sensor is right there. Could be leaking a bit. Or a valve cover gasket leaking.

Plugs aren't too bad. Gapped a bit too much though. Set them at .045.

10-20-2016, 02:05 PM	#22
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,785	Re: Terrible idle, difficult start, and smoke! Too high up for head gasket. Look in the rad when it's idling and look for bubbles. That's how to tell if it's a head gasket. Also your coolant temp sensor is right there. Could be leaking a bit. Or a valve cover gasket leaking. Plugs aren't too bad. Gapped a bit too much though. Set them at .045.