Heat Riser knocking - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Phuloi68** · 05-26-2005, 08:41 AM

Got what sounds like a knock coming from the heat riser on an 85 truck with a 305 engine. I have sprayed wd40 on it thinking that would help but it still knocks. it seems like it is free but i don't know how it is supposed to work.
At first I thought it was a rod knocking but it is the heat riser. Haven't a clue what causes it and what to do. I am hoping someone on this board has had this happen and knows what to do. I thought about disconnecting it but don't know if that is a good move or not.
Any suggestions?

05-26-2005, 08:41 AM	#1
Phuloi68 Senior Member Join Date: Dec 2003 Location: Valparaiso, In Posts: 1,114	Heat Riser knocking Got what sounds like a knock coming from the heat riser on an 85 truck with a 305 engine. I have sprayed wd40 on it thinking that would help but it still knocks. it seems like it is free but i don't know how it is supposed to work. At first I thought it was a rod knocking but it is the heat riser. Haven't a clue what causes it and what to do. I am hoping someone on this board has had this happen and knows what to do. I thought about disconnecting it but don't know if that is a good move or not. Any suggestions? __________________ Phuloi68 Indy survivor Norwood survivor Big Sandy survivor for those who fight for it... F R E E D O M has a price the protected will never know.

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