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  #1  
Old 06-08-2021, 02:34 AM
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Misfire Misery

2004 x5 3.0. 260,000 miles.

In a quest to solve misfire problems I have replaced:

MAF sensor
Disa valve
Cleaned idle control valve
Fuel filter
Spark plugs
All Injectors
All coil packs

Symptoms are rough idle after initial start up. Cold and warm. Crappy acceleration.

Runs better for short time after clearing codes the bad at check engine light activation.

Generic codes are
P1419
P0301
P0305
P0300

I've checked all typical vacuum leak spots.
I'm suspecting any of these below.

Wire connection from coil pack to DME. How can I check that? Disconnect on 1 has no noticable affect.
A vacuum leak
Camshaft sensor
Crankshaft sensor
Fuel tank breather valve
Vanos trouble
Intake Mainfold gasket
Vac control valve
Vac check valve

Just ordered noid checker and compression tester

I deleted ccv a year ago for oil catch can.

I could really use some help. Thinking about taking it to shop but would really like to solve it myself. Running out of money.
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  #2  
Old 06-08-2021, 10:22 AM
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If you have done the CCV "mod" as they call it, then your entire engine becomes a source for vacuum leaks. What do the P-codes translate to? It would probably be better to get a scanner that would read the BMW codes. If a compression test shows a problem though then not much else matters.
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  #3  
Old 06-08-2021, 11:06 AM
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Vacuum leak

I know what mean about entire motor being a vacuum leak. Everything seems the same in that dept though. I tried it with vac line plugged and just venting out catch can but no change. It is a unfortunate complication for diagnosing things and will be hard to explain to a shop. Compression tester here tomorrow. If need be I can go back to stock ccv. Thanks for your input.
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Old 06-08-2021, 12:10 PM
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Please define those codes for us...I am not looking them up.

what happens if you start the car with MAF unplugged? Does it runs smooth w/out misfires? If so, you likely have a vacuum leak.

You really need to smoke test it. If you don't have a tester, pay a pro to do a smoke test for you. short money...
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  #5  
Old 06-08-2021, 12:13 PM
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Hello,
I'm new to the site and wanted to help. I'll introduce myself in a separate post.
The lower three codes are misfires. The first code is probably causing the lower three misfires.

Have you cleaned the secondary MAF sensor? It's on the right fender.
Check out this video. https://www.youtube.com/watch?v=NR84c_61C9I
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Old 06-08-2021, 12:26 PM
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Okay, so I looked one code up
P1419 is related to the secondary air MAF sensor.

An '04 X5 is going to have the later secondary air system. There are no vacuum lines in the later system to cause a vac leak. OP should investigate the whether the secondary air system is working, but it is easy to test.. Does the pump come on for 30-50 seconds on a cold start? The secondary MAF may be bad. you can also remove secondary air check valve, blow thru it and see if it is clogged.
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Old 06-08-2021, 01:06 PM
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Wow thanks for all the great replies

I had tried to clean secondary air flow and pump is coming on, it sounds like a jet at start up. I was thinking that would only be a cold start issue but might as well check for clogs etc in that. Codes are for random misfire and cylinder misfire on 1 and 5. 1419 is secondary air situ. I'll check that out after work tonight. Thanks guys.
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  #8  
Old 06-08-2021, 01:31 PM
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Quote:
Originally Posted by Briansbummerbmw View Post
I had tried to clean secondary air flow and pump is coming on, it sounds like a jet at start up. I was thinking that would only be a cold start issue but might as well check for clogs etc in that. Codes are for random misfire and cylinder misfire on 1 and 5. 1419 is secondary air situ. I'll check that out after work tonight. Thanks guys.
Sounds like your pump is failing. Common problem after 100,000 miles. Mine went out and sounded just like yours. Jet taking off from my garage was loud enough for my neighbors to hear.
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Old 06-08-2021, 11:33 PM
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A misfire in a modern computer control engine is not the same as a misfire in an engine that has a carburetor and a distributor. Misfires in those old engines could be traced to spark plugs, ignition cable, point or distributor. A misfire in modern computer-controlled engines means the computer has detected that a cylinder or cylinders are not producing the same amount of power as other cylinders. The computer can see the crank rotational speed when the cylinder fires. Fuel trim data can provide you with an insight as to how the engine is performing. If the computer is adding fuel to the fuel trim, it means the cylinder(s) is running lean. You will not be able to detect this condition without a scanner that can provide real-time data. Unless you like throwing parts at the problem, I suggest that you bring it to a tech that knows what they are doing.
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Old 06-09-2021, 12:18 AM
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Unhappy Modern engines

Oh yeah excatly! For real, I'm 54 and my thinking has been from my past experience with old cars and is all wrong. This is actually the first car I've worked on with fuel injection. I was driving a friend's car home from work today and it started to dawn on me exactly what your saying. I was just getting an idea of the ECU detecting a problem then actually turning off the cylinder. So stupid. Now I feel sort of panic and like I'm in over my head. The X5 is or was my daily driver. I had just finished 3 new CV joints and bearings and put in new drive shaft about a month ago. And had just bought ball joints and other stuff to rebuild front end when she started crapping out, then all the other stuff. So about 3000 in three months. I know it's a sob story. I have my friends car for 5 more days. The compression tester is here tomorrow so I might as well follow through with that. I'm thinking of throwing in towel and try and sell it for 500 bucks, try and return the front end parts. Damn it's frustrating.
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