HAVE a 97 e320.

car had bad idling and running rough.

up to date i have replaced plugs and coil connectors to plugs.
now idles smooth but rough when revving and flooring the car it will hesitate and battle to reach rpm.
it will rev to red line but takes a while getting there.
when i drove it for a while yesterday it felt like it was getting better and would accelerate better.
was unsure of the coils .....i replaced earlier. it made no difference.

the car right now is still rough and wont rev.....no check engine light or any codes.

PLEASE HELP.......NOT SURE WHAT TO DO NEXT

nobody have any suggestions???

Ok, check the engine harness and look at actual valves for the airflow meter.



Joe

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Project Smoker, '87 603 powered wagon
Hauler, 96 CTD can you say torque?
Toy 73 Cougar xr7 convertible
Acme Automotive Inc.
Raleigh NC
919-881-0364

I'm surprised you don't have any codes. Either your experiencing a mis-fire (which would set a code) or you have a mass-air sensor problem of which would set a code too. Do you suppose your fuel filter might be clogged?

My thoughts , also..
Don't assume there are no system monitored faults just cuz there is no CE lamp...[CE lamp is emmisions related fault indicator only.. ]
Have you actually gone into code retrieval and live stream data??

When my engine wiring harness was bad, my car backfired through the intake manifold, misfired, stumbled, etc., and the CE light was never tripped.

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Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".

HI SUGINAMI....
nice to see you here. you helped me a couple of months ago with a 1994 e 320 i had. that was on another forum.

update...
the car is very bad when cold....snap changes when shifting and wont rev beyond 3000 rpm ..very rough. while driving i would take it out of gear and it will rev to red line but still rough.

after about 3 miles it will start clearing itself...when it is warm it feels good and the gears change smoothly but there is still a bit of roughness when you kickdown and floor it.

i think i have 2 problems that are not related...

1) the vibration i feel on the car thru the steering goes away when i put a trolley jack and jack up the transmission of the car slightly...the vibration goes away. i will replace the transmission mount and also the rubber disc on the propshaft.

2) i saw a post where ARTHUR DALTON explained the closed/open loop cycle that the car goes thru when it is cold on the transmission....

could there be a relation to my problem.

just to confirm there are no codes and check engine light.

About your shifting issue, the car does have an upshift delay valve, that delays the transmission shifting from 2nd gear to 3rd gear, causing your catalytic converter to warm up quickly.

However, this definitely would've tripped a check engine light (code #26), which is a very common occurence on these cars.

About your missing problem, you might have a bad coil wire, or maybe an intermittent connection between one of the coil wires and its supressor end.

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Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".

YIP SUGIMANI.
I HAVE DONE ALL OF THAT . NEW COPPER PLUGS, COILS AND PLUG CONNECTORS BETWEEN PLUGS AND COILS.....

I would check the plugs again. You might have got a bad plug.

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Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".

THIS problem is intermitend. some times floor it and power comes on nice and smooth.
other times you pull of and accelerate and the motor will "bog down". you have to back off and accelerate smoothly.
i checked plugs again and all fittings. idles smooth without a miss. if i pull injector wires off 1 by 1 it stumbles... the same with the plug caps.

PLEASE WHAT COULD CAUSE THIS.

B.T.W if it was a clogged fuel filter would the problem be intermittend???

I still think it's starving for fuel

low fuel pressure, bad fuel press. regulator, clogged fuel filter, etc. etc.

an old friend once told me....if you think it is electric its fuel..

WILL THE PROBLEM BE INTERMITTEND WITH FUEL STARVATION??