GeoffJ

Hiya,

My cars been getting slight intermittent engine miss problemz at low rpm and idle speeds. Any ideas would be of use, thanks!

Regards,

Jedi54

iTrader: (7)

is it misfiring?
If so, most likely bad coils , plugs, or wires.

GeoffJ

thanks for quick reply..will further look into it. :D

Jedi54

iTrader: (7)

what exactly is the car doing?

thisllub

What fuel are you using?
I find low octane fuel can cause flat spots.

GeoffJ

shell's, V-power............or MOBIL's high octane.

GeoffJ

yeah engine tends to misfire at idle speeds, any ideas on what likely causes this would be.

Is it a possiblity its to do with the seal? being paranoid lol.

Jedi54

iTrader: (7)

misfires at idle?
does the engine sputter? does the car shake a bit when it 'misfires'?
Usually misfires happen under load and at higher rpm's.

Could you describe in detail exactly what the car is doing at idle? is the Check Engine light on or flashing?

Sorry for all the questions, just trying to rule things out and help diagnose your car from the other side of the planet.

GeoffJ

yup. At idle speeds, then gets a little rough, as u accelerate the roughing fades.

Cromax

It's normal for the car to pop and burble when you first start it though.

If it's happening all the time (even after driving around a bit) it's either your spark plugs, wires, or coils.

Do you have any flat-spots about 4-5000rpm?

laythor

don't mistake the pop of a normal rotary at idle to a misfire... you'll know if it's a misfire if you lose power in the 5k range like Cromax has said. I love the pop pop pop the 8 makes in the low revs.

takahashi

If you have a early year model or you have vibration shake in your gear stick, then check the sagging engine mounts.

GeoffJ

gear sticks, fine....it might be just what cromax said.. it does somewhat go pop, pop.....................haha

mikeyr

Geoff,

I'm still running the original plugs and coils at 56k but have spares (ready to change out). my problem was leads.

I put Magnecor leads on and my "rough idle" reduced by 95%. Even the missus commented unprompted! I'd checked the factory ones were well connected so must have just been poor quality.

Good luck

M

GeoffJ

very nice, I'll hopefully be able to look into this next week when i have the opportunity.

Thanks,