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Misfire cylinder 5, about to pull open engine as last resort!
04-10-2017, 12:22 PM,
Post: #11
RE: Misfire cylinder 5, about to pull open engine as last resort!
(04-10-2017, 12:14 PM)willisodhiambo Wrote:  
(04-10-2017, 09:43 AM)JarsaR Wrote:  Hey,

I see you have tried with second hand injector,
but what if you change this cylinder 5 injector to other cylinder? thinking
Injector is quite a common problem on this N53.
Is the chain timing OK?

Not bothered with that yet. We have been reasoning that timing would affect all cylinders, not just one. Will swap injectors all over and retest.

By the way, timing is via gears and chain. How exactly can it slip? I have never understood how such a thing can happen at all on a car with steel chain

Hey,

modern car`s chain is usually that light made, so it stretches out,
And eventually slip. Worst case breaks the whole engine.
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04-10-2017, 18:35 PM,
Post: #12
RE: Misfire cylinder 5, about to pull open engine as last resort!
(04-10-2017, 12:14 PM)willisodhiambo Wrote:  By the way, timing is via gears and chain. How exactly can it slip? I have never understood how such a thing can happen at all on a car with steel chain

You are very wrong. A worn chain is very common.
On some engines, replacement is needed through 100K. devil

Put all the measured parameters here. More values are needed.
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04-10-2017, 19:03 PM,
Post: #13
RE: Misfire cylinder 5, about to pull open engine as last resort!
Are you sure engine is N52??? On a F10? Give me VIN please.
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04-10-2017, 19:49 PM,
Post: #14
RE: Misfire cylinder 5, about to pull open engine as last resort!
If it is a n 52 engine and the only fault you get is the misfire cyl 5. you should put the valvetronic system in limp mode or fully open the valves and see if still misfires..
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05-10-2017, 07:04 AM, (This post was last modified: 05-10-2017, 07:19 AM by willisodhiambo.)
Post: #15
RE: Misfire cylinder 5, about to pull open engine as last resort!
(04-10-2017, 19:03 PM)solidss Wrote:  Are you sure engine is N52??? On a F10? Give me VIN please.

happy N52 indeed, preLCI C549399

(04-10-2017, 19:49 PM)olaf Wrote:  If it is a n 52 engine and the only fault you get is the misfire cyl 5. you should put the valvetronic system in limp mode or fully open the valves and see if still misfires..
How exactly do I do that, pull out motor plug?

Update. It now moved to cylinder 4! This is after we opened up intake to look for anything abnormal, air leaks e.t.c. but jumbled up coils and plugs when putting it back together!!!!!

I think this is a good sign. Asked the owner to thrash it for a day or so so we see if it sticks in cylinder 4 or moves about and whether it moves about in bank 2 or makes excursions into bank 1.

Will update after next encounter. I think it is an ignition problem but not ruling out injection entirely either!. I want to spend an afternoon with it (office work interferes a lot) and follow through the following in quick succession, each followed by a test drive and diagnosis,

1. Swap coils around, drive, diagnose. If changes recorded, replace all coils
2. Swap plugs, drive, diagnose, If changes occur and 1 above was negative, replace plugs
3. Swap injectors, drive, diagnose, If changes occur, replace injectors, if negarive and 1 and 2 also negative...
4. Pull out oxygen sensors, drive and diagnose. If misfire stops, replace these if misfire present proceed
5. Pull out valvetronic motor plug, drive and diagnose (Is that how to put it in limp mode) If misfire still occurs sit down, take a deep breath and drink some beer as we think of the next steps....which leave us with intake, airflow meter and DME
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05-10-2017, 09:39 AM,
Post: #16
RE: Misfire cylinder 5, about to pull open engine as last resort!
(04-10-2017, 12:14 PM)willisodhiambo Wrote:  
(04-10-2017, 09:43 AM)JarsaR Wrote:  Hey,

I see you have tried with second hand injector,
but what if you change this cylinder 5 injector to other cylinder? thinking
Injector is quite a common problem on this N53.
Is the chain timing OK?

Not bothered with that yet. We have been reasoning that timing would affect all cylinders, not just one. Will swap injectors all over and retest.

By the way, timing is via gears and chain. How exactly can it slip? I have never understood how such a thing can happen at all on a car with steel chain

Swapping the suspected faulty injector into another cylinder and re-testing would surely narrow your diagnosis down and save you a lot of ball ache stripping the engine downwink
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05-10-2017, 11:54 AM,
Post: #17
RE: Misfire cylinder 5, about to pull open engine as last resort!
(04-10-2017, 08:46 AM)willisodhiambo Wrote:  
(04-10-2017, 04:39 AM)nguyennhatquang Wrote:  1. Faulty DME => u should reflash it again first
3. Faulty harness => it should set fault code of miss communication
2. Worn or faulty compression ring => do a compression test or cylinder leakage test..that is the best method before take it a part

Compression test has shown all OK, DME flash will be included. Someone also suggested faulty head gasket but I would expect that to show up in compression test or coolant consumption.

If a car has blow head Gasket it will start loosing coolant...
can u Measure the Radiator pressure to verify it...

Did u do both Dry compression test & wet compression test to identify faulty Piston Ring.. The best is doing the cylinder leakage test.

Please hit Reputation button if u think my info is helpful.
Regards
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06-10-2017, 09:08 AM,
Post: #18
RE: Misfire cylinder 5, about to pull open engine as last resort!
I know the problem. That is ecu problem. I sent pm how can you repair
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06-10-2017, 13:18 PM, (This post was last modified: 06-10-2017, 13:25 PM by willisodhiambo.)
Post: #19
RE: Misfire cylinder 5, about to pull open engine as last resort!
(05-10-2017, 11:54 AM)nguyennhatquang Wrote:  
(04-10-2017, 08:46 AM)willisodhiambo Wrote:  
(04-10-2017, 04:39 AM)nguyennhatquang Wrote:  1. Faulty DME => u should reflash it again first
3. Faulty harness => it should set fault code of miss communication
2. Worn or faulty compression ring => do a compression test or cylinder leakage test..that is the best method before take it a part

Compression test has shown all OK, DME flash will be included. Someone also suggested faulty head gasket but I would expect that to show up in compression test or coolant consumption.

If a car has blow head Gasket it will start loosing coolant...
can u Measure the Radiator pressure to verify it...

Did u do both Dry compression test & wet compression test to identify faulty Piston Ring.. The best is doing the cylinder leakage test.

Unfortunately it was others who did the test. I think Ill repeat just to be sure. I believe wet test is spurting some oil into the cylinder and cranking engine to see how it compares to dry state? If dry test show significant lower compression to wet test then we can conclude a poor oil ring?

(06-10-2017, 09:08 AM)semihmutcali Wrote:  I know the problem. That is ecu problem. I sent pm how can you repair

Thanks. Opening the DME is a whole different propositionsweating I guess though that it may explain the strange behaviour. Thanks. Will definitely deal with DME as last resort, opening engine seems not to make any sense as problem is most likely electrical. Thought of DME too but asked myself why one cylinder
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07-10-2017, 07:52 AM,
Post: #20
RE: Misfire cylinder 5, about to pull open engine as last resort!
(06-10-2017, 13:18 PM)willisodhiambo Wrote:  
(05-10-2017, 11:54 AM)nguyennhatquang Wrote:  
(04-10-2017, 08:46 AM)willisodhiambo Wrote:  
(04-10-2017, 04:39 AM)nguyennhatquang Wrote:  1. Faulty DME => u should reflash it again first
3. Faulty harness => it should set fault code of miss communication
2. Worn or faulty compression ring => do a compression test or cylinder leakage test..that is the best method before take it a part

Compression test has shown all OK, DME flash will be included. Someone also suggested faulty head gasket but I would expect that to show up in compression test or coolant consumption.

If a car has blow head Gasket it will start loosing coolant...
can u Measure the Radiator pressure to verify it...

Did u do both Dry compression test & wet compression test to identify faulty Piston Ring.. The best is doing the cylinder leakage test.

Unfortunately it was others who did the test. I think Ill repeat just to be sure. I believe wet test is spurting some oil into the cylinder and cranking engine to see how it compares to dry state? If dry test show significant lower compression to wet test then we can conclude a poor oil ring?

(06-10-2017, 09:08 AM)semihmutcali Wrote:  I know the problem. That is ecu problem. I sent pm how can you repair

Thanks. Opening the DME is a whole different propositionsweating I guess though that it may explain the strange behaviour. Thanks. Will definitely deal with DME as last resort, opening engine seems not to make any sense as problem is most likely electrical. Thought of DME too but asked myself why one cylinder

Think the parts like fuse. every part controlling one cylinder if one of them stucked, your one cylinder stuck smile
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