# knock on cold starts? **URL:** \ **Category:** NYSpeed Automotive\ **Created:** [April 13, 2006, 8:35pm UTC](https://forums.speedlife.net/t/knock-on-cold-starts/10749 "2006-04-13T20:35:38Z")\ **Posts on this page:** 18\ **Page:** 1
**Author:** ![newman](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/newman/32/7569_2.png) [@newman](https://forums.speedlife.net/u/newman)\ **Post date:** [April 13, 2006, 8:35pm UTC](https://forums.speedlife.net/t/knock-on-cold-starts/10749/1 "2006-04-13T20:35:38Z")
Last 2 times i started the elise (after sitting for 2+ days) it would knock pretty badly for about 1 second. Sounds like rod knock. However, it goes away and the car runs fine, sounds fine after about one second… however, it didn’t do this before. the engine is bone stock, but the oil pan is coming off tommorow… Should i pull the rod caps while i am down there? ---
**Author:** ![TgDn32](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/tgdn32/32/7360_2.png) [@TgDn32](https://forums.speedlife.net/u/TgDn32)\ **Post date:** [April 13, 2006, 8:36pm UTC](https://forums.speedlife.net/t/knock-on-cold-starts/10749/2 "2006-04-13T20:36:22Z")
I think my diesel truck is knocking, it sure does make a lot of fucking noise when I drive it. ---
**Author:** ![Choda](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/choda/32/7347_2.png) [@Choda](https://forums.speedlife.net/u/Choda)\ **Post date:** [April 13, 2006, 8:36pm UTC](https://forums.speedlife.net/t/knock-on-cold-starts/10749/3 "2006-04-13T20:36:26Z")
run thicker oil ---
**Author:** ![nitroinsane](https://avatars.discourse-cdn.com/v4/letter/n/d26b3c/32.png) [@nitroinsane](https://forums.speedlife.net/u/nitroinsane)\ **Post date:** [April 13, 2006, 8:37pm UTC](https://forums.speedlife.net/t/knock-on-cold-starts/10749/4 "2006-04-13T20:37:58Z")
piston slap? ---
**Author:** ![newman](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/newman/32/7569_2.png) [@newman](https://forums.speedlife.net/u/newman)\ **Post date:** [April 13, 2006, 8:39pm UTC](https://forums.speedlife.net/t/knock-on-cold-starts/10749/5 "2006-04-13T20:39:30Z")
it doesn’t sound like piston slap. I was going to put thicker oil in it after i reinstall the pan… Thoughts on accusump? The car is going down for some parts installs… Should i get it? ---
**Author:** ![newman](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/newman/32/7569_2.png) [@newman](https://forums.speedlife.net/u/newman)\ **Post date:** [April 13, 2006, 8:55pm UTC](https://forums.speedlife.net/t/knock-on-cold-starts/10749/6 "2006-04-13T20:55:07Z")
[http://www.on-trackperformance.com/canton%20accusump.htm](http://www.on-trackperformance.com/canton%20accusump.htm) would be about 350 all said and done… what do you guys think?.. ---
**Author:** ![Maksim2000](https://avatars.discourse-cdn.com/v4/letter/m/dec6dc/32.png) [@Maksim2000](https://forums.speedlife.net/u/Maksim2000)\ **Post date:** [April 13, 2006, 8:59pm UTC](https://forums.speedlife.net/t/knock-on-cold-starts/10749/7 "2006-04-13T20:59:04Z")
Could it be the HLAs/Liftes pumping up ? Edit: or chain tensioner ? ---
**Author:** ![Jack](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/jack/32/7613_2.png) [@Jack](https://forums.speedlife.net/u/Jack)\ **Post date:** [April 13, 2006, 9:00pm UTC](https://forums.speedlife.net/t/knock-on-cold-starts/10749/8 "2006-04-13T21:00:45Z")
those pumps are allright. I researched em before for some project i had going on ---
**Author:** ![Onyx\_Z32](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/onyx_z32/32/7581_2.png) [@Onyx\_Z32](https://forums.speedlife.net/u/Onyx_Z32)\ **Post date:** [April 13, 2006, 9:14pm UTC](https://forums.speedlife.net/t/knock-on-cold-starts/10749/9 "2006-04-13T21:14:31Z")
My forged poop knocks for a bit when the motor is still cold. I don’t know anything about your motor - does it have any forged poop in it? ---
**Author:** ![Viper966](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/viper966/32/7268_2.png) [@Viper966](https://forums.speedlife.net/u/Viper966)\ **Post date:** [April 13, 2006, 10:17pm UTC](https://forums.speedlife.net/t/knock-on-cold-starts/10749/10 "2006-04-13T22:17:15Z")
its cuz all the oil drains out of the mains and it takes a second to bring up pressure… just wirr the starter for a second ---
**Author:** ![TrueBlue](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/trueblue/32/7245_2.png) [@TrueBlue](https://forums.speedlife.net/u/TrueBlue)\ **Post date:** [April 14, 2006, 7:22am UTC](https://forums.speedlife.net/t/knock-on-cold-starts/10749/11 "2006-04-14T07:22:50Z")
> [@Viper966](#): > > its cuz all the oil drains out of the mains and it takes a second to bring up pressure… just wirr the starter for a second yup. sounds normal. ---
**Author:** ![LZ1](https://avatars.discourse-cdn.com/v4/letter/l/7ab992/32.png) [@LZ1](https://forums.speedlife.net/u/LZ1)\ **Post date:** [April 14, 2006, 7:38am UTC](https://forums.speedlife.net/t/knock-on-cold-starts/10749/12 "2006-04-14T07:38:12Z")
GM Piston slap owned you. ---
**Author:** ![Fry](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/fry/32/7284_2.png) [@Fry](https://forums.speedlife.net/u/Fry)\ **Post date:** [April 14, 2006, 8:13am UTC](https://forums.speedlife.net/t/knock-on-cold-starts/10749/13 "2006-04-14T08:13:43Z")
Got a good oil filter on her? IIRC a lot of oil filters also double as check valves, preventing oil drainback while sitting. ---
**Author:** ![Inn-Tune](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/inn-tune/32/7588_2.png) [@Inn-Tune](https://forums.speedlife.net/u/Inn-Tune)\ **Post date:** [April 14, 2006, 8:20am UTC](https://forums.speedlife.net/t/knock-on-cold-starts/10749/14 "2006-04-14T08:20:57Z")
> [@newman](#): > > [http://www.on-trackperformance.com/canton%20accusump.htm](http://www.on-trackperformance.com/canton%20accusump.htm) > > would be about 350 all said and done… what do you guys think?.. I’m putting one on my car. It certainly can’t hurt especially considering the way you drive. ---
**Author:** ![newman](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/newman/32/7569_2.png) [@newman](https://forums.speedlife.net/u/newman)\ **Post date:** [April 15, 2006, 8:23pm UTC](https://forums.speedlife.net/t/knock-on-cold-starts/10749/15 "2006-04-15T20:23:24Z")
this is a new thing though… Im a bit concerned, frankly… esp with 100 more HP than stock… I need to remove the oil pan tommorow to do some other work… is there a way that i can check out the rod clearance with it still in the car? Platigauge? Or is it likely piston slap. This one has done it the last 2 cold starts… What could have changed? Could it be the weather warming up and the oil is thinning and draining? ---
**Author:** ![Carnut](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/carnut/32/7590_2.png) [@Carnut](https://forums.speedlife.net/u/Carnut)\ **Post date:** [April 15, 2006, 8:26pm UTC](https://forums.speedlife.net/t/knock-on-cold-starts/10749/16 "2006-04-15T20:26:56Z")
accusump for life ---
**Author:** ![newman](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/newman/32/7569_2.png) [@newman](https://forums.speedlife.net/u/newman)\ **Post date:** [April 15, 2006, 9:49pm UTC](https://forums.speedlife.net/t/knock-on-cold-starts/10749/17 "2006-04-15T21:49:31Z")
wow… pretty common… i am getting less concerned… [http://www.elisetalk.com/forums/showthread.php?t=5770&highlight=accusump](http://www.elisetalk.com/forums/showthread.php?t=5770&highlight=accusump) [http://www.elisetalk.com/forums/showthread.php?t=8408&highlight=accusump](http://www.elisetalk.com/forums/showthread.php?t=8408&highlight=accusump) [http://www.elisetalk.com/forums/showthread.php?t=17505&highlight=start](http://www.elisetalk.com/forums/showthread.php?t=17505&highlight=start) [http://www.elisetalk.com/forums/showthread.php?t=16163&highlight=start](http://www.elisetalk.com/forums/showthread.php?t=16163&highlight=start) ---
**Author:** ![93dx\_hatch](https://avatars.discourse-cdn.com/v4/letter/9/90ced4/32.png) [@93dx\_hatch](https://forums.speedlife.net/u/93dx_hatch)\ **Post date:** [April 15, 2006, 9:55pm UTC](https://forums.speedlife.net/t/knock-on-cold-starts/10749/18 "2006-04-15T21:55:26Z")
> [@pianomaniac](#): > > Oil is full and clean and so sweet looking, I’ve been tempted to taste it ummm, yeah