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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 11-09-2019, 08:22 AM
R3jus R3jus is offline
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Need help with misfires

So i found out the problem was the ccv hoses, so i took of the intake manifold, replaced the whole ccv, replaced intake manifold gasket and put everything back on everything runs fine but i still get the misfire in cylinder 6, Could this be the problem because i didnt change the throttle body gasket? Or something else is wrong?please help
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  #2  
Old 11-09-2019, 11:09 AM
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with a single cylinder fault, its very improbable the TB gasket is your issue. 4 things come to mind.....plug, coil, injector or compression for cylinder 6 in your case.
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Old 11-09-2019, 11:20 AM
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So its TB gasket?
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Old 11-09-2019, 01:38 PM
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Quote:
Originally Posted by mattmar1 View Post
4 things come to mind.....plug, coil, injector or compression for cylinder 6 in your case.
Are any one of those 4 items mentioned a throttle body gasket?
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Old 11-09-2019, 02:10 PM
R3jus R3jus is offline
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I did not change the throttle body gasket
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Old 11-09-2019, 03:09 PM
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i doubt its a Tb gasket... that gasket is a lot lest important then others like manifold (*where the crankcase pressure is a lot different )
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Old 11-09-2019, 06:49 PM
R3jus R3jus is offline
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Well i did change the intake gasket
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Old 11-09-2019, 07:53 PM
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Well i did change the intake gasket
Did you read post # 2?
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Old 11-09-2019, 07:57 PM
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did you remove the throttle body and reinstall it with the old gasket, or are you just leaving us to figure out what you did thru osmosis? we need a bit more detailed info in the future. as stated before, a single cylinder steady miss is most likely what was mentioned in post # 2.
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Old 11-10-2019, 12:26 AM
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Yes i removed the throttle body and put it back on with the old gasket
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Old 11-10-2019, 06:23 AM
R3jus R3jus is offline
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What 2 post?
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Old 11-10-2019, 10:07 AM
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post #2 above...posts are sequentially numbered
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Old 11-10-2019, 10:29 AM
R3jus R3jus is offline
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But if it was a bad coil wouldnt it always throw a check engine and misfire? It only happens at random moments... but if i had low compression what should i do then?
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Old 11-11-2019, 09:39 AM
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coils can be intermittent, or change in efficiency under differing load conditions. if low compression, go thru the normal compression check tests post fail checks to see whats causing the issue...valve, rings etc, we can "if" for days...but youve got to go thru the recommendations above to see what it is.
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Old 11-11-2019, 10:04 AM
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So i chould check comppresion? Yesterday i dropped into lower gear and it was a missfire in the 3 cylinder not in the 6
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Old 11-12-2019, 10:05 AM
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id recommend checking everything in post #2, might even add a smoke test for vac leak if the miss changes cylinders again.
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Old 11-12-2019, 11:11 AM
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Originally Posted by R3jus View Post
So i chould check comppresion? Yesterday i dropped into lower gear and it was a missfire in the 3 cylinder not in the 6
How do you know the misfire moved to cylinder 3?
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  #18  
Old 11-12-2019, 12:47 PM
R3jus R3jus is offline
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The computer told me to
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Old 11-12-2019, 05:11 PM
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so gotta ask..have you tried any troubleshooting yet?
when you say computer, what kinda hardware are you using to read the codes? if on a laptop. what software are you using?
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Last edited by mattmar1; 11-12-2019 at 05:58 PM.
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Old 11-12-2019, 11:14 PM
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No its a small computer with obd2.support i bought it like for 30 bucks just to see and delete the codes also check the data stream
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Old 11-13-2019, 12:50 AM
Bmwe39528i Bmwe39528i is online now
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Dude do what mattmar1 said...
Get compression tester and check all cylinders, write it down.
Next check your spark plugs and change them if they're bad or it's time to change them.
Then simply swap the injectors, 5 with 6 and 2 with 3.
Drive around and see if you get misfires changed to cylinders 2 and 5. If you do, then injectors are your problem.
If misfires are still occurring, swap your ignition coils from cylinders 6 to 5 and from 3 to 2.
Then drive a few more days and see if misfire code changes.
If your spark plugs were still good, swap them places as well.
Then come back and let us know what happened.

Last edited by Bmwe39528i; 11-13-2019 at 12:51 AM.
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Old 11-13-2019, 02:00 AM
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Under the lift arms
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Quote:
Originally Posted by R3jus View Post
No its a small computer with obd2.support i bought it like for 30 bucks just to see and delete the codes also check the data stream
this isnt going to work for a BMW..

I mean for basic obd2 codes yes.. BUT since BMW and every manufacture sub codes now..

you will need a more advance scanner

The foxwell NT510, which is the schaben bmw tool

INPA, or ISTA, Or reingold
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