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7 Series - E65 / E66 (2002 - 2008)
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  #1  
Old 01-25-2010, 06:50 AM
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wilson009 wilson009 is offline
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Misfire in Cylinder #1

Ok the car is all back together but I am getting a Misfire in Cylinder #1.

Codes with possible descriptions are as follows

2799
- Abort DV-adaption because of environment


274E
- misfire on several cylinders
- Misfire detection, Checksum failure
- Lambda sensor error Nernst cable VKAT bank 1


2742
- misfire Cyl. 1
- Lambda sensor heater resistance diagnostic VKAT bank 1


Here's what ive done

Swapped plugs
swapped injectors
swapped ignition coils
verified there was spark in ignition coil by using a spark tester and seeing spark
Removed sparkplug and felt compression and smelled gas
uplugging the ignition coil on cylinder 1 makes no difference in roughness while unplugging others will make it worse.

WDS reports the the DME will shut off gas to a injector if misfires are continues. I witnessed this by watching the injector start when the codes were cleared and then shutoff after the code activated.

So I know I have spark, gas, compression. Then the gas is shutoff due to the misfire. All the other cylinders seem to be running fine.

Could a vacuum leak cause all that?

Any takers?
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  #2  
Old 01-25-2010, 07:49 AM
bghubr bghubr is offline
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Try swapping the injector from cylinder 1 to another cylinder and see if the missfire moves to another cylinder. Could be a bad injector.
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  #3  
Old 01-25-2010, 08:18 AM
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wilson009 wilson009 is offline
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I did that. I swapped all the components between 1 and 5 but the misfire stays with cylinder 1
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Old 01-25-2010, 08:43 AM
bghubr bghubr is offline
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Sounds like you need to do a compression test on cylinder 1 vs another cylinder.
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  #5  
Old 01-25-2010, 09:00 AM
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wilson009 wilson009 is offline
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Yeah that's on my list of to-do's.

I think its highly unlikely. It ran great before I took the engine apart and its not smoking or anything. I will be checking that though.



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Originally Posted by bghubr View Post
Sounds like you need to do a compression test on cylinder 1 vs another cylinder.
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  #6  
Old 01-25-2010, 09:59 AM
bghubr bghubr is offline
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Also try this.


To check the injector you can get a "Noid Light" at a parts store. Unplug the injector connector and plug the noid light into the injector connector. Start the engine. If it flashes while the engine is running, then the injector electrical system is working. If it stays on steady, you have an open in the wire between the injector and the PCM or a bad PCM.
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  #7  
Old 01-25-2010, 10:16 AM
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wilson009 wilson009 is offline
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Ok will do.

Thats the one variable I"m not sure of .

I know that the injector works when I clear the codes at start up, but then stops working as it runs.

This is either because the ECU sent it a shutoff code to the injector due to the misfire, or its simply not running after it started. I personally think that the ECU is cutting it off but not sure.

btw is this any different than running a voltage check? I did check the voltage and output was the same on both injector connectors.


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Originally Posted by bghubr View Post
Also try this.


To check the injector you can get a "Noid Light" at a parts store. Unplug the injector connector and plug the noid light into the injector connector. Start the engine. If it flashes while the engine is running, then the injector electrical system is working. If it stays on steady, you have an open in the wire between the injector and the PCM or a bad PCM.
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  #8  
Old 01-25-2010, 11:12 AM
Keif Keif is offline
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It basically just tests to make sure it's getting the pulse to fire off the injector.
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  #9  
Old 01-25-2010, 11:30 AM
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wilson009 wilson009 is offline
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Ok well here's one. I called my dealership to try to get some hints

One theory that sounds pretty plausible is Timing.

He said if the timing is off even a tooth it will cause misfire and the 1st cylinder will misfire 1st. This comes down to slack in the chain.


When I timed it the first time and spun it 2 rotations it was off slightly. I made adjustments and spun again and it held. However me spinnning a few times vs. a engine rpms can't be compared. If the chain tensioners hydraulics didn't get oil pressure right away the chain slack could have affected the timing by just a hair.


The thing that bothers me about this theory is if the cam was off then why is only #1 misfiring. If it was off wouldn't 1,2,3,4 cylinders all misfire and set subsequent error codes?
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  #10  
Old 01-25-2010, 11:38 AM
bghubr bghubr is offline
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The noid lite also simulates the injector and fools the PCM to think the injector is there.
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  #11  
Old 01-25-2010, 01:45 PM
UltZeven UltZeven is offline
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I hope it's something small because you've put a lot of work into it.
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  #12  
Old 01-25-2010, 06:40 PM
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wilson009 wilson009 is offline
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I'm leaning towards it being off time. But I'm not taking it back apart till i know for sure. I'll be able to do this with my eyes closed by the time this is over......

I drove it around the block so it is driveable.

After driving I had misfires codes on all the cylinders. I reset the errors and drove again and only got cylinder 1 errors again.
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  #13  
Old 01-25-2010, 09:38 PM
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07841-tb 07841-tb is offline
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Ed, How does No. 1 plug look?
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