The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 350 ticking noise but only at idle. What would it be?

68gmsee · 02-21-2018, 01:35 PM

Since it seems to be coming from under the vehicle and at park or idle I would use a long section of stiff garden hose (maybe 4 to 5 ft piece) as a stethoscope and see if you can pin point it that way.

I used that method to isolated a drive shaft noise by lifting one tire off the ground, shocked it really good and had someone idle the truck. Just be careful and not get under the truck. The hose should be long enough to reach the area that you suspect.

My brother had a similar noise on his car one year and it turned out to be a hairline crack on the flex plate where the bolts are.

02-21-2018, 01:35 PM	#8
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: 350 ticking noise but only at idle. What would it be? Since it seems to be coming from under the vehicle and at park or idle I would use a long section of stiff garden hose (maybe 4 to 5 ft piece) as a stethoscope and see if you can pin point it that way. I used that method to isolated a drive shaft noise by lifting one tire off the ground, shocked it really good and had someone idle the truck. Just be careful and not get under the truck. The hose should be long enough to reach the area that you suspect. My brother had a similar noise on his car one year and it turned out to be a hairline crack on the flex plate where the bolts are. __________________ 68 GMC 250/3 speed Saginaw p/b p/s 69 Chevy 350/350 currently in pieces still lookin for a cab 06 Trailblazer I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive...