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2008135i 2008135i is offline
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Default Cracked intake manifold? - 04-22-2019, 03:26 PM

I've been battling cylinder 5 issues for a few months and I'm being to think either a cracked intake (or blown intake gasket) or a cracked piston...

Issues started with car smoking from exhaust and smells like its running rich. Pulling spark plugs showed cylinder 5 plug full of soot. I replaced that injector (all index 12), installed fresh plugs gapped to .024 and PR ignition kit (also re flashed tune).

After replacing that stuff, the smoking went away even after flashing a custom (Trebila, full e85 / 25psi) tune it was fine for about 2 weeks, now its smoking again. This time it's also misfiring on cylinder 5 randomly.

I pulled cylinder 5 spark plug again, and found it looks melted (like it ran lean). The engine oil also smells like fuel (normal if running straight e85?). I installed a fresh plug only to have cylinder 5 misfire again. So far to correct the issue I have replaced:

-Valve cover and gasket (small leak near cylinder 5)
-Change plugs and install PR ignition coil kit
-Check Mosfits (although in MSD81, they all check ok)
-Replaced cylinder 5 injector with new
-Replaced all vacuum lines

Im at a point where I feel like either I have a cracked intake / bad cyl 5 gasket (causing the one cylinder to run rich) or a cracked ring land resulting in misfires and odd engine oil smell. Ive attached a few pictures and logs (misfire log was short as I let off once it happened), any help is appreciated.
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Attached Files
File Type: csv 2019-04-21 09_41_43_Map-6 misfire.csv (5.9 KB, 17 views)

Last edited by 2008135i; 04-22-2019 at 03:47 PM..
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Vorsprung_CJB Vorsprung_CJB is offline
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Default 04-22-2019, 05:07 PM

I've heard of the individual intake manifold gaskets getting blown out in rare cases. How many miles, did you ever remove the manifold for intake valve cleaning?
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2008135i 2008135i is offline
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Default 04-22-2019, 05:11 PM

Quote:
Originally Posted by Vorsprung_CJB
I've heard of the individual intake manifold gaskets getting blown out in rare cases. How many miles, did you ever remove the manifold for intake valve cleaning?

Car has 80k miles... Yes,I did a valve cleaning about 5000, miles ago.
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Default 04-22-2019, 05:29 PM

Did you replace the gaskets?
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2008135i 2008135i is offline
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Default 04-22-2019, 05:39 PM

Quote:
Originally Posted by Vorsprung_CJB
Did you replace the gaskets?

Yes all 6 intake gaskets and the throttle body gasket.
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Default 04-23-2019, 12:26 AM

At this point I’d start with a compression / leakdown



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Default 04-23-2019, 04:02 PM

Quote:
Originally Posted by Dave @ BMS/Fuel-It!
At this point Iíd start with a compression / leakdown
Yes, I just ordered a leakdown test kit, although compression test came back good. Also going to try and pressure test / check intake manifold...
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Default 04-23-2019, 09:32 PM

Quote:
Originally Posted by 2008135i
Yes, I just ordered a leakdown test kit, although compression test came back good. Also going to try and pressure test / check intake manifold...
Good idea.

Glad your taking this approach vs blindly throwing $ and parts at the car.

Hoping leakdown comes back positive



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2008135i 2008135i is offline
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Default 04-28-2019, 01:06 PM

Compression and leakdown results are interesting...


Compression, leakdown
Cly1= 200psi. . 20%
Cyl2= 195psi. . 20%
Cyl3= 197psi. . 5%
Cyl4= 190psi. . 27%
Cyl5= 182psi. . 26%
Cyl6= 198psi. . 20%
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Default 04-28-2019, 09:21 PM

Quote:
Originally Posted by 2008135i
Compression and leakdown results are interesting...


Compression, leakdown
Cly1= 200psi. . 20%
Cyl2= 195psi. . 20%
Cyl3= 197psi. . 5%
Cyl4= 190psi. . 27%
Cyl5= 182psi. . 26%
Cyl6= 198psi. . 20%
Iíve seen a few cars pass compression / fail leakdown...



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Default 04-29-2019, 03:44 AM

Quote:
Originally Posted by Dave @ BMS/Fuel-It!
Iíve seen a few cars pass compression / fail leakdown...

Would you consider this a fail? Just seems odd that the only cylinder having problems is 5, yet 4 other cylinders test almost exactly the same (both compression and leakdown wise).
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Default 04-29-2019, 05:08 AM

The plastic intake manifolds are pretty cheap and easy to replace.
If you do suspect that then just pick up another and fit it. Some people are giving them away, going to aftermarket intakes.


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Default 04-29-2019, 12:44 PM

Quote:
Originally Posted by 2008135i
Would you consider this a fail? Just seems odd that the only cylinder having problems is 5, yet 4 other cylinders test almost exactly the same (both compression and leakdown wise).
Eh- I wouldnít think this is a fail, given how close the values are.



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2008135i 2008135i is offline
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Default 04-29-2019, 05:22 PM

that was my thinking also... Bought stuff to pressurize the charge ***** and intake to (hopfully) find the leak.

Last edited by 2008135i; 04-29-2019 at 05:43 PM..
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Default 04-29-2019, 08:54 PM

Quote:
Originally Posted by 2008135i
that was my thinking also... Bought stuff to pressurize the charge ***** and intake to (hopfully) find the leak.
The n54 can be great, but so frustrating too.

Keep me posted- interested



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