[ceejay]

Hi all,

I bought my first Merc today... a 1988 W126 300 SEL.

As as I start the engine from cold, it misfires for a few seconds and then runs perfectly smoothly and does not misfire at all after that.

I noticed that the misfire only lasts as long as the oil pressure gauge is rising. As soon as it rises to its normal level, the misfire goes away.

All this only takes a few seconds... may be 8 or 10 seconds.

It could be just a coincidence about the oil pressure gauge and misfire syncronising.

Please let me know why this could be

 

[ceejay]

try this

I dont know if this little issue is common only to the 6 cylinder engine... The last 2 posts seem to be from owners of 560s.

Try this and tell us what happens. It has helped mine a great deal.

Once you remove the air cleaner housing, you will have full view of the throttle linkage.

Look out for the micro switch which gets pressed when the throttle is in the fully off or idle position.

Open the throttle by either working the linkage by hand or getting someone to press the pedal but release it gently.

Now see if the switch is depressed. If not, adjust the linkage so that it is depressed once the throttle is released.

Fit the air filter back and try starting it.

Do not press the throttle when starting the engine.

Mine starts much quicker than before and doesnt seem to miss any more.

Try this and let us all know the results.

 

[ceejay]

reving didnt help

on mine reving didnt help. It always took the same amount of time to start running smooth. Just a few seconds. The few times i used it after the linkage adjustment, it has run smooth from the start.