E320Star

I ma not sure why my car does this. When the engine is running and car not moving, it sometimes vibrates acutely and goes away. It does not die. WHen i press the gas pedal, the minor occaional vibrations goes away. What could be? is it normal? Is possibly related to the after market air filter not passing proper air to the engine ? Or could be a missfire? What is amissfire anyway? Please help.

E320Star

any takers pleeease?

BlownV8

When was the last time you replaced your MAF? Mine started doing this at first and later progressed to stalling and very sluggish acceleration.

Whitey

It could be a number of things...timing, dead spark, MAF, clogged air filter etc.

No offence, but you seem to have loads of issues with your ride lately which seems unsual, I'd suggest taking her in for a full check.....just a thought

E320Star

Not really. loads of issues !!! I just had a question about this little occional twich when the car is running idle. It runs great still. I just wanting to know what could be !!! The Air filter is very clean. I bought it from NAPA auto parts store. It matched the original airfilter in size and quality.

E320Star

I replaced the MAF 1000k miles ago. That is whn I started noticing the issue

BlownV8

Go back and check your connections. I guess there is a possibility that the MAF was bad when you put it in or got something on the sensor wire?

E320Star

Done. No noticable issues. All in place just fine. Area was vacummed before the filer was installed. all looke in order.

my E430 rocket

motor mounts?

do iu feel griding in the pedal?

OceanView

Something you might check is your engine coils.
There are 3 of them and you might have problems with just one.
I had a similar issue about a year ago. It will rough idle but once you get up to speed, it will be fine.

Also could be spark plug connectors.

Good luck.

E320Star

Not an engine mount that is for sure. It starts easily and smoothly just fine. It can not be spark plugs. I am wondering if it is the fuel filter !!

smazur

change the plugs and connectors. It may need to be done anyhow and will cost you $100 in parts and about an hour of your own time.

E320Star

Do u own the same year and model? How hard is it?

smazur

Mine's a 97 E320. Same job though... Search the threads to learn how to do it, and make sure you buy at least a 9 or 10 inch socket extension before you remove the engine cover. Otherwise, it's just about the easiest job under the hood.

BenzVince

If you think your car misfiring, don't you think that the engine check light would come on. I know it will but, have you checked that or noticed it? If not, then maybe it just has a hiccup.

Richard Galing

When a vehicle detects a misfire that exceeds "normal limits" it illuminates the check engine light and sets a P-Code that corresponds to the misfiring cylinder. I suggest you use an OBDII scan tool to check, the last number in a P300 series code tells you which cylinder is misfiring.

E320Star

If that is the case, it is not missfiring then. It can not be. I am thinking it may need a tune up @ 50k miles. it is now 47k.

jemmy

28k and mine does that slightly also when idle, as additional information it has been sitting for 12 months... got everything checked and oil changed, run like hell still and that's about it?
btw, what's MAF and what does it do?