e39 523i misfiring, wont accellerate properly
- Thread starter DannyW
- Start date
Soldato
[TW]Fox;16125832 said:
Surprised it's not run on red diesel (Danny would find a way!).
you need to come on the forums and ask if its 'spark plugs'?
in the time you switched the pc on, picked your nose during startup, posted this.. you could have had a couple out by this point already!
and it would have been a crankshaft sender, and if its been replaced its unlikely to be involved in your missfire.
are you sure its missfiring and not something else? go listen to the exhaust to make sure
in the time you switched the pc on, picked your nose during startup, posted this.. you could have had a couple out by this point already!
and it would have been a crankshaft sender, and if its been replaced its unlikely to be involved in your missfire.
are you sure its missfiring and not something else? go listen to the exhaust to make sure
Soldato
Another week then?
Permabanned
I thought he worked in a garage or his dad had one?
was early hours of morning couldnt find a garage open
It's bloody annoying in the new BMWs though, the whole dash goes yellow if the range is under 50km.
It cuts off the clock, date, radio station/cd track, etc..
Cancel it and it comes back within 8 seconds
Irritating to say the least when you're in a rush and want to know the time without having to look at your watch..
With it being a straight six, surely there's only the one?
Soldato
Soldato
[TW]Fox;16125133 said:
hahaha
Caporegime
good point. Forgot the BMW was a straight 6.
![[TW]Fox](/data/man-of-honor/2009.png){kind=avatar}
Well the Spark Plug interval is approximately 60,000 miles.
You are so amazing at fault finding.
Soldato
In addition to the stuff mentioned, leaking vac hoses leading to the manifold will create these symptoms as the engine wont know what do do with all the unmetered air going in.
When I changed my manifold on my older 525i I misconnected a vac hose and it was very much like this.
When I changed my manifold on my older 525i I misconnected a vac hose and it was very much like this.
Caporegime
to be fair you've got to start somewhere. I know its cool to hate dannyw, but thats the way you solve things like this on your own. Replace things one by one till you've ruled them out. Given the plugs were on 30k they could do with being replaced anyway.
No the way you solve things is read the damn fault codes.
Plugs are changed every Inspection 2 - depending on the cars usage profile this could be anything up to between 50-80,000 miles.
Soldato
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This happened with my dads 2l mondeo, his fault was the fuel pump so that could be a culpret 
Soldato
[TW]Fox;16130181 said:
What's to say there is a fault logged? That motor is from before misfire detection was implemented, so a fault with the coils or plugs (which I think is most likely) probably won't show a fault.
Even when you do get faults logged, it's by no means a clear indication of the problem, just a source of information for your diagnosis.
For example only: My car can be misfiring and showing errors for the MAF and lambda sensor, yet the actual fault is that the coils which share a supply with those sensors aren't getting good power.
So no, the way you actually solve things is to acknowledge all the symptoms, read fault codes if there are any, then consult your experience and/or the workshop manual until you identify a fault that matches the symptoms and explains the fault codes. Reading the codes isn't a requirement.
For another example: If you have a misfire and a colder exhaust header (read with an laser temp gauge). You move that coil to another cylinder and the colder exhaust header goes with it, you replace the coil, no need to add code reading to the customer's bill.
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Well its the obvious first step before you buy replacement parts, given that half the things which can trigger this sort of problem with an E39 will flag up fault codes.