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Old August 19th, 2014, 07:38 PM   #1
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Underdrive Pulley Problem

So, I installed the Unorthodox underdrive crank pulley and have tightened the hell out of the crank pulley bolt so that shouldn't be any concern. However when I always hit 3rd gear the misfire light flashes on me.

My guess is its unbalanced? I might just take it off and put the stock back on idk...heres a video capturing it. I'm not feeling very safe with this modification on...

https://www.youtube.com/watch?v=kk49...ature=youtu.be
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Old August 19th, 2014, 07:45 PM   #2
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I have an unorthodox crank pulley on my accord as well and I dont have a problem. just an fyi.

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Originally Posted by pa1nt13aller View Post
So, I installed the Unorthodox underdrive crank pulley and have tightened the hell out of the crank pulley bolt so that shouldn't be any concern. However when I always hit 3rd gear the misfire light flashes on me.

My guess is its unbalanced? I might just take it off and put the stock back on idk...heres a video capturing it. I'm not feeling very safe with this modification on...

https://www.youtube.com/watch?v=kk49...ature=youtu.be
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Old August 19th, 2014, 08:19 PM   #3
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Originally Posted by bozos_si View Post
I have an unorthodox crank pulley on my accord as well and I dont have a problem. just an fyi.


Hmmmm okay good to know. Maybe I'll datalog and try to find out what the sensors are reading when I duplicate the scenario.
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Old August 19th, 2014, 09:56 PM   #4
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Reset the ecu
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Old August 19th, 2014, 10:04 PM   #5
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Bro, you need to scan your ECU to see if there are any codes stored, and running it hard if it keeps flashing. The light only flashes, then goes off ?
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Old August 20th, 2014, 01:38 AM   #6
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1. There's a misfire light?
2. If problems continue without resolve, send it over, will test to see if it's just the pulley :-)
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Old August 20th, 2014, 02:19 PM   #7
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Bro, you need to scan your ECU to see if there are any codes stored, and running it hard if it keeps flashing. The light only flashes, then goes off ?
Yes the light flashes then goes away after 4-5 "flashes" of the check engine light. I am familiar by this as a misfire. Ill, scan it soon yes.


@Oracle the misfire light flashes in the video I provided. The car runs very well normally, but something is going on with high cam I think...idk if its the pulley or not. I'm going to datalog tomorrow morning and see what I can find out.
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Old August 20th, 2014, 02:46 PM   #8
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Pretty sure the pulley has nothing to do misfire. From the threads I have read on here, misfires are caused by valves that are out of adjustment or a coil pack going bad
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Old August 20th, 2014, 04:27 PM   #9
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Like I already told you, I didn't have any issues like that on mine. But just some advice, I'd check the bolt tight sometime in the near future. I torqued mine to spec when I installed it and about 2k miles later when paul went to take it off, he didn't need any tools, the bolt was free spinning.
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Old August 20th, 2014, 04:39 PM   #10
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Could also be a crank or cam sensor going bad.
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Old August 20th, 2014, 04:58 PM   #11
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Pretty sure the pulley has nothing to do misfire. From the threads I have read on here, misfires are caused by valves that are out of adjustment or a coil pack going bad
+spark plugs or valve cover seals allowing oil to seep into the plug holes with the coil packs. If the smaller pulley is causing misfires, you've got bigger problems. If an engine can run without the serpentine belt (no accessories), then I wouldn't think the pulley could affect timing. It's just coincidence, i think.

Example, after cleaning and recharging my air filter, I got misfires after hitting the limiter while not under load. Reset ecu and it went away. Did check and found a little oil around one of the plugs so I cleaned it. Weeks now with no issues since.
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Old August 20th, 2014, 06:25 PM   #12
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WAIT. I just realized.....im running full synthetic. I just switched it over to full synthetic recently because I work at honda and had a lot of saved up 1Qt's of it. So i went the cheap way and used em up. I heard somewhere recently not to do that in our engines....verification anyone???
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Old August 20th, 2014, 06:44 PM   #13
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I've used full synthetic for two+ years now without this problem.
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Old August 20th, 2014, 07:13 PM   #14
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WAIT. I just realized.....im running full synthetic. I just switched it over to full synthetic recently because I work at honda and had a lot of saved up 1Qt's of it. So i went the cheap way and used em up. I heard somewhere recently not to do that in our engines....verification anyone???
Man, not to sound mean but you are throwing everything at the wall and hoping it sticks. Oil is not your problem. I bought my car with 48k miles (currently 134k) and switched to full synthetic since day one. I did this with all my vehicles. The only thing they say about switch to synthetic is that viscosity is lighter and could cause some oil to leak through old seals.

You have a misfire, its fuel or spark. Hope that helps. I suggest scanning the ECU asap
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Old August 20th, 2014, 07:44 PM   #15
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Man, not to sound mean but you are throwing everything at the wall and hoping it sticks. Oil is not your problem. I bought my car with 48k miles (currently 134k) and switched to full synthetic since day one. I did this with all my vehicles. The only thing they say about switch to synthetic is that viscosity is lighter and could cause some oil to leak through old seals.

You have a misfire, its fuel or spark. Hope that helps. I suggest scanning the ECU asap
Telling the truth isn't being mean...sorry I'm acting before I give it any thought myself. I'll look into it, scanning and datalogging. thanks everyone
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Old August 21st, 2014, 12:33 AM   #16
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i have the rz light weight pulley let me know if u fix the problem aslo what belt did u use for the pulley?
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Old August 21st, 2014, 12:40 AM   #17
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mines been running fine. i got 338k kilometers on the car.

running 5w-20 synth or 10w30 conventional for now
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