help: vibrating

[ALI BABA]

I started my 1998 E39 540i today in the morning and the engine began vibrating and the rpms were going down around 400rpm...while driving i felt a loss of power and it kinda bogged and shook at take off... any help with this issue would be great. i baught this car recently and there has been no tune-up that i know of done.

[qmf]

So you bought a used 540i without inspecting it first......isn't this magical.....

[SR240SX]

Do some maintenance.

Oil change/filter
fuel/air filter
plugs
check tire pressure

[ALI BABA]

Originally posted by qmf
So you bought a used 540i without inspecting it first......isn't this magical.....
did i say i never inspected it? btw this problem just occured yesterday

oil/filter were changed like 400 kms ago
plugs/wires will be changed tommrow thnx sr240sx

[ALI BABA]

i scanned it at AutoValue and turns out it was a misfire in cyl #2
i changed the sparkplugs and no change, the car is still vibrating and the next step is the coil packs..there are no sparkplug wires so ill see what goes on

[n1zm0]

fill up gas lately?, maybe some bad gas?, we had a car at work with misfire, the lady said she filled up at some small town up north, turned out to be shitty gas

[ALI BABA]

yeah i guessed that too so will see i just droped 25 liters of 91 octane in it from empty and 2 bottles of injector cleaner so ill see if that helps but thankyou

[1-Bar]

check the coil boots before you replace the coilpacks. On my e36 I had similar issues, boots were cracked in 3/6....gl

[ALI BABA]

one of them was cracked i dont think it was cyl #2....would that cause a misfire also?

[Bimmer88]

Originally posted by ALI BABA
one of them was cracked i dont think it was cyl #2....would that cause a misfire also?

If the boots are cracked then yes it will cause a misfire but since it's in cylinder #2....

When you see a misfire happening it could only be one of two things or a bigger problem. Usually it's the sparkplugs or cracked boots. Goodluck!

[ALI BABA]

Originally posted by Bimmer88


If the boots are cracked then yes it will cause a misfire but since it's in cylinder #2....

When you see a misfire happening it could only be one of two things or a bigger problem. Usually it's the sparkplugs or cracked boots. Goodluck!

I will be changing the boot in 1 hour and the spark plugs were changed...im hoping its nothing more than that

[ALI BABA]

problem solved:) it was the ignition coils

[Douche]

Originally posted by SR240SX

check tire pressure


:werd: