325I MOTOR

[MrMike]

done a services on the motor
but number 4 /5 has no effect..
i mean if the car is idling and u remove each plug 1 at a time
when u come to 4 /5 the motor still sounds the same.
plug has spark....tried changing plug wires,tried changing plugs,still the same..any help or advice

[Jos]

are the plugs wet with fuel? is the spark as good as on the other cylinders?

Before Grrr gets in there:

http://www.e30zone.net/e30zonewiki/inde ... oubleshoot

[Grrrmachine]

It's probably worth reading up on the Ignition system too:

http://www.e30zone.net/e30zonewiki/index.php/Ignition

since it sounds like either your HT leads, distributor or spark plugs have failed.

You can also learn about the entire M20 engine, in case this is a valve/rocker problem:

http://www.e30zone.net/e30zonewiki/index.php/M20

[MrMike]

but we changed all the pulgs
checked distributor
plug wires even the engine..when removing the plug it does what it was supose to..it back fires

so i tried everything..

only thing is i dont wana leave it by a macanic and then he RIPS me off..

eish

im lost

[Jos]

are the plugs wet with fuel? have you tried moving injectors round?

[Grrrmachine]

Take the spark out, rest it on top of the rocker cover with the HT lead connected, and crank the motor to ensure that it's sparking. If not, you have an Ignition fault.

Once you've confirmed spark on all cylinders, do a compression test; you will need a special tool for this, but they're not expensive. Confirm that all cylinders has compression within 1bar of eachother; if they don't you have an engine problem. If they do, start investigating the injectors for those cylinders.