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cold start knock / detonation?

 
Old 10-08-2017, 10:04 AM
  #11  
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Get a stethoscope (or hold a screwdriver up to your ear) and place it on various parts of the engine and find exactly the area the noise is coming from.
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Old 10-08-2017, 12:42 PM
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Crank it over with the fuel pump deenergized. First with plugs in it.. Usually you can tell if a cylinder has low compression by an inconsistent cranking cycle noise. Can’t explain over typing. But thats if you don’t have compression gauges. Then crank it over without plugs. If that noise comes back. It’s probably mechanical. . Sounds like detonation to me. A really bad detonation at that. But it’s hard to tell. Feel the motor and see if you can pin point it by vibration.
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Old 10-08-2017, 11:04 PM
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I'd check your rocker assembly ASAP.. I'm confused how it can go away when warm, but I've heard that noise with a lopey idle before and it was a roller bearing on the rocker assembly that had grenaded, didn't go away when warm though.
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Old 10-30-2017, 06:16 AM
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Running the motor without accessory belt it idles much better @ start up. Less idle surging, no knocking.

Put the belt on it surges and knocks just like in the video. With stethescope the sound comes from the block/head.

Deleted A/C running 45" belt now, changed alternator. everything spins freely. I'm at a loss for how the drag from the accessories causes knock and surging idle for cold start.


Good thing its winter here so i can put this turd in storage!
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Old 10-30-2017, 07:07 PM
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upload new video
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Old 10-31-2017, 11:17 AM
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Originally Posted by StocS2k View Post
upload new video

https://youtu.be/3X-llwRWXdc

So exciting to watch.
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Old 10-31-2017, 11:47 AM
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Originally Posted by StocS2k View Post
upload new video

https://youtu.be/3X-llwRWXdc

So exciting to watch.
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Old 01-08-2019, 08:32 AM
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member messaged me about this so I figured I would add a conclusion for anyone searching.


I figured it out... kinda. Nothing mechanical. I'm running e85 only. I think that as temps drop and the e85 fuel blend changes it was unhappy on cold start. I drained fuel added the most quality e85 I could find locally and it ran fine. Part of the problem with the tune is probably associated with me telling my tuner that the injectors were ID1000cc which I thought they were. I ran out of fuel long before power goals were met and it seems like the injectors much smaller than 1000, but had no markings to determine size. I'm kinda assuming this plays a role as I used a very competent tuner. picked up some new injectors for retune
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Old 01-08-2019, 02:58 PM
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Just a thought, could a injector be leaking or flowing enough to come close to hydrolocking just one cyl ?

ROD
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