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Old 04-26-2019, 08:36 PM   #1
scg
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Bad idle after a mistake

Hi all,

I'm dealing with a rough idle and I can really use some help and advice.

To begin with, my Evo is a 2010 SE and it's completely stock. Iím logging with Evoscan and a tactrix 2.0 cable using the the MUT III ECU setting.

The issue started when I was checking lash adjuster clearances and I managed to drop one of the valve cover bolts onto the valve tappet on the exhaust side and I didnít notice. I checked the clearances on half of the engine and when I turned the engine over to check the other half, I turned it pretty hard by hand without thinking. The stray bolt marred the side of one of the cam lobes and basically bent at 90 degree angle, but didnít seem to do any real damage to anything else. Just glad they are aluminum. The scratch on the cam lobe was above any contact points, so it seemed like everything was ok. So, I put everything back together.

When I started the car it had a rough idle with a lot of popping in the exhaust. It basically sounds like a Harley at idle. I suspect valve overlap, or something like that. The RPMs fluctuate between 1.5k and 1.25k, periodically dipping down to 750 at which point it sounds like it comes close to stalling before jumping back up. It throws a P0017 CEL which is an ďCrankshaft/camshaft (exhaust) position sensor phase problem". So, I figure I did more damage than I had originally thought, so I replaced the cam sensor which didnít help. I also noticed that unplugging the exhaust sensor didnít make any difference. Running down the list of problems associated with this code, Iíve checked the timing belt tension and position and that looked fine. Pulled out the oil control solenoid and bench tested it. That checked out. Changed the oil, partly just to make sure there were no metal flakes in it. That was fine. Running down the list, the next thing to check out is the VVT sprocket and the crankshaft position sensor. I doubt itís the crank sensor and before I remove the cam shaft to check the VVT, I wanted to compare my VVT values at idle to a good set. I did notice that the exhaust side fluctuates at idle along with the movement in RPMs, so Iíd like to know whatís going on there.

I attached my log which includes the VVT readings and a few other measurements. Two things I noticed were that the VVT readings oscillated between 51 and 57 (degrees) for the most part. The reading would drop into the high 40s after a little while, 15 seconds or so, and then move up into the low 60s before settling down again. This seems to track with fluctuations in the RPMs as well. When I eased into the throttle, it would drop to -14, with a drop in RPM until I gave it more throttle. Then it comes back up to normal readings and the RPM rises. I donít know if this is normal or not. The drop in RPM certainly isnít. This is where a healthy idle would be nice to see. The other oddity I saw was that the exhaust VVT tracked perfectly with the intake VVT. Maybe this is normal under no load, but again I canít be sure without a comparison. Another possibility is that the VVT values could be the target values rather than the actual values. I'm not sure what the readings are in MUT III. I understand that a patched ROM will allow both values to be displayed. Is there a preferred ROM to use?

If anyone has any advice or sees anything of note in the log that I should look at, please let me know. I want to get back on the road!


Thanks for the help,
Scott
Attached Files
File Type: zip EvoScanDataLog_2019.04.23_09.22.32_1.zip (57.4 KB, 9 views)
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Old 04-27-2019, 03:52 PM   #2
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Quote:
Originally Posted by scg View Post
The issue started when I was checking lash adjuster clearances and I managed to drop one of the valve cover bolts onto the valve tappet on the exhaust side and I didn’t notice. I checked the clearances on half of the engine and when I turned the engine over to check the other half, I turned it pretty hard by hand without thinking. The stray bolt marred the side of one of the cam lobes and basically bent at 90 degree angle, but didn’t seem to do any real damage to anything else. Just glad they are aluminum. The scratch on the cam lobe was above any contact points, so it seemed like everything was ok. So, I put everything back together.
That sucks, nothing is easy is it.
Taking a step back... why were you checking your valve lashing if you are 100% stock?

There is a chance your MIVEC phaser is broken, and you would be able to see it not tracking correctly in the logs target vs actual. Step 1 should be updating to RAX logging. I have RAX logging enabled and at idle my VVT-Target = 0 and my VVT-Actual = ~0.3. Get RAX enabled, there is a sticky on one of these forums and the instructions are still accurate. Then upload your new log to Datazap. It makes reading and sharing these a lot easier.



Have you checked compression yet?
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Old 04-28-2019, 09:47 AM   #3
MR. EVO MR
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If you still have it, open up the oil filter and double check for shavings there too.
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Old 04-29-2019, 08:05 PM   #4
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I'll check the oil filter, I think I still have it. Hopefully nothing in there. I'm working on getting the ROM updated as well. Taking a little while because of limited time, but I'll get it. I was just checking the lash adjuster gap as part of the 60k checkup. No signs that there were any problems. I did a compression check as part of the checkup, but I can do another one now and make sure that looks good.

Thanks everyone,
Scott
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Old 05-03-2019, 11:17 PM   #5
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I had a little time to work on this during the week. First thing I want to do is backup the currently installed ROM on my ECU. I tried reading it with ECUFlash but it's complaining that there is no definition found. It seems like it should find it with all the definitions that came with ECUFlash. I would think it would fit one of the 2010 USDM SST definitions, but no luck. Is there a way to determine the id associated with the ROM? Despite the fact that it's called OpenECU, ECUFlash doesn't appear to have any open source code so I can't figure out what ROM binary looks like. I tried reading out everyone location of the binary as a 32 bit integer, both signed and unsigned, but nothing was in the right range. The definitions that came with ECUFlash have 55580005 and 55580006 for my year, market and transmission type but I also found a 55580009 rom somewhere without a definition. I'm wondering if that is the one I have. I'll keep at it and figure this out but I'm wondering if anyone has any suggestions?

Scott
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Old 05-04-2019, 05:48 AM   #6
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Found the ROM ID. It's 55580010. Looks like the 2010 SE had it's own ROM.
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