rough idle

[maximus]

First of all i want to say thanks to mercedes shop for having such a great forum if it wasnt for u guys i would probably go bankrupt .Here is my problem i would drive the car for about 1 hour let it seat for about 15 mins then i would smell gas then i would try to start it , it would die the first try then go again with a very rough idle i would floor it after about 5 to 10sec i would go and everything would be find
just replace ovp , cat converter, new plugs ,wires. thanks guys

[Folgado]

Hi!

I have a very similar problem, what is your car?
Does the engine quits?

Folgado
93 S500

[maximus]

It's a 1989 300e and yes the engine would quit on me the first try then it would start again but with very rough idle and i could smell gas like i have a leak or something

[J.HIDALGO]

Check the fuel lines and fuel related items under the vehicle. Passenger's side behind a plastic cover. Another thing you can check is the EHA which, is under the air filter assembly. It is a black box attached to the rear of the fuel distributor. Not uncommon to leak. If it is leaking, replace it.
Good luck!

[maximus]

well as a result of my rich idle , smell of fuel , rough idle when hot my car as now failed inpection failed the co inspection by a mile
by the way J i did check the eha it s leaking a little bit of fuel pull it out i thought it might be the 2 small o ring that needs to be replaced so i replaced them and tighten it back i do know if that is going to work , as far as failing inspection going to change my o2 sensor this weekend

[J.HIDALGO]

check in the DIY section. There is a excellent article by Steve Brotherton on evaluating electronic controls. If your EHA is leaking, chances are, it is bad.
Good luck!

[maximus]

Ok let's say the EHA is leaking could that be the cause of my rough idling the engine is running rich i try to adjust the idle mixture it is like having no effect on the way the engine is running always running rich which is why i failed inspection

[joel]

you wouldn't want to continue running rich. if so,
you might need another cat.

[Joreto]

maximus, I had the same problem with my car it turn out that the O2 sensor was bad. I got a new one and everything was back to normal.


Joreto
190e 2.5-16v
BMW E30 320i