455 running rough, video
May 24th, 2021, 09:58 AM
#1
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Join Date: Apr 2009
Posts: 118
455 running rough, video
Need some help on diagnosing this engine. Runs rough and I can't figure out which direction to go with it.? Any input would be appreciated. Thanks
455
performer intake
Cutlassefi cam 226/230
Holley sniper
Edelbrock heads
May 26th, 2021, 11:40 AM
#3
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Join Date: Jan 2010
Location: central Indiana
Posts: 5,401
That might be nothing more than big aggressive cam rough idle. The vacuum gauge is steady, it seems to idle like a rowdy cam should. I’m at work (it’s pretty loud in hear, I can’t hear anything on the video).
May 26th, 2021, 03:31 PM
#5
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Location: Poteau, Ok
Posts: 41,052
With all of the noises on your video it's hard to tell specifically what your asking about. The low vacuum can be symptom of the cam and is normal. What you want to see is a steady needle with minimal fluctuation.
May 26th, 2021, 04:00 PM
#6
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Location: West Hartford, CT
Posts: 1,497
I don’t listen to a lot of engine running vids but my first impression is that it sounds “ticky.” Could be exhaust leaks, could be valve adjustment, could be engines tend to sound like that in a phone vid.
If there are exhaust leaks, fix them first so you can hear any other noises first. It might also make sense to check valve adjustment and correct if warranted. Valve maladjustment could give you a variety of noises based on tight/loose and that might be something the vac gauge is indicating. These would be two basics that I would start with based on what I can guess from vid.
As mentioned, a vid of exhaust sound at tailpipes might be helpful for people here to give a listen.
If there are exhaust leaks, fix them first so you can hear any other noises first. It might also make sense to check valve adjustment and correct if warranted. Valve maladjustment could give you a variety of noises based on tight/loose and that might be something the vac gauge is indicating. These would be two basics that I would start with based on what I can guess from vid.
As mentioned, a vid of exhaust sound at tailpipes might be helpful for people here to give a listen.
July 13th, 2021, 10:25 AM
#7
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Thread Starter
Join Date: Apr 2009
Posts: 118
I don’t listen to a lot of engine running vids but my first impression is that it sounds “ticky.” Could be exhaust leaks, could be valve adjustment, could be engines tend to sound like that in a phone vid.
If there are exhaust leaks, fix them first so you can hear any other noises first. It might also make sense to check valve adjustment and correct if warranted. Valve maladjustment could give you a variety of noises based on tight/loose and that might be something the vac gauge is indicating. These would be two basics that I would start with based on what I can guess from vid.
As mentioned, a vid of exhaust sound at tailpipes might be helpful for people here to give a listen.
If there are exhaust leaks, fix them first so you can hear any other noises first. It might also make sense to check valve adjustment and correct if warranted. Valve maladjustment could give you a variety of noises based on tight/loose and that might be something the vac gauge is indicating. These would be two basics that I would start with based on what I can guess from vid.
As mentioned, a vid of exhaust sound at tailpipes might be helpful for people here to give a listen.
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