Where is this knock coming from? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

Reply
 
 
 
Thread Tools Search this Thread
Old 04-18-2005, 12:29 PM   #1
Senior Member
True Car Nut
Thread Starter
 
Join Date: Oct 2002
Location: Genoa, Illinois
Posts: 4,013
Thanks: 0
Thanked 0 Times in 0 Posts
Allmachtige is on a distinguished road
Default Where is this knock coming from?

Sometimes I'll be cruising along at 60mph, punch it, can get maybe .3 KR. Other times I'll punch it can get a moment of insane KR upwards of 12 points! When this happens I can hear the engine hesitate for a split second as if I tapped the gas once, then floored it a second time, when in reality I just floored it from the get-go.

This has gonna be KR or something is banging. I'm beginning to suspect that oversize waterpump pulley I have is hitting the really close motor mount so I'm gonna get a lightweight stock sized one for the time being, but any other ideas what could cause this? Yes recently I did put in the 3.2" to test her out, but I can't see how going from 3.3 to 3.2 would cause speratic KR spikes.
Allmachtige is offline   Reply With Quote
Old 04-18-2005, 12:48 PM   #2
Senior Member
Certified Car Nut
 
Join Date: Jun 2003
Posts: 15,928
Thanks: 0
Thanked 0 Times in 0 Posts
BonneMeMN is on a distinguished road
Default

Fuel delivery, maybe filter or FPR? I know you're obsessed with plugs so i assume those are golden...
BonneMeMN is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
knock knock knock L27Buick 1992-1999 7 09-17-2004 04:23 PM
Knock Knock continued (spun bearing) Spiral 1992-1999 5 05-25-2004 09:57 AM
Knock Knock, engine knock? Spiral 1992-1999 5 05-23-2004 10:08 PM
KR without Knock> Not even false knock? streetracer Performance, Brainstorming & Tuning 1 08-18-2003 02:08 PM
Knock Knock Tamara 1992-1999 11 01-31-2003 05:26 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 11:57 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.