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Old 09-24-2009, 08:14 PM
Rod Rod is offline
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Join Date: Apr 2003
Location: Sunset, Louisiana
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89 420 sel 02 snesor

I have an bad idleing problem I can't figure so I'm nickel and dimeing it.

I replace the fuel filter, still rough idle

I replaced all spark plugs, still idle rough

could 02 sensor cause rough idle?

Thanks

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1998 Land Rover Range Rover 66K Miles
1988 300SE Totaled in 1998, hit by drunk driver, but we walked away OK
1989 420SEL 140,000, just warming up. Total by 18 wheel gas truck rear ended, but refused to lose another MB. Had it repaired cost $10,000+ Great Car again SOLD it for a 2003 C320 to save on gas
1991 2500 Suburban 454, 130,000, Best truck in the world. SOLD it out right.
1952 8N Tractor 1,000,000-/+
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  #2  
Old 09-24-2009, 10:01 PM
E150GT's Avatar
I'm a chicken
 
Join Date: Sep 2006
Location: SAN ANTONIO, TEXAS
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could be injectors, temp sensors, vacuum leaks, spark plugs, wires, distributor cap and rotor, fuel distributor, etc etc etc. This problem could nickel and dime you to the poor house. Id do a search on it and see what other people have come up with...
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  #3  
Old 09-25-2009, 01:34 AM
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Please add a better description of 'bad idling'. There are far too many variables. Words like too low, speed goes up and down from xx rpm to yy rpm, black smoke, hissing noise etc etc etc.
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Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor

Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL

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Not part of the in-crowd since 1952.
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  #4  
Old 09-25-2009, 04:49 PM
Rod Rod is offline
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Join Date: Apr 2003
Location: Sunset, Louisiana
Posts: 79
It started suddenly

The 89 420 SEL runs fine above 5mph.

Starts great, idles rough, give it gas and most time it goes just fine, but here latly it has started hessitating when you give it gas.
Last week my wife was driving and was stopped at a green light ready to turn left, as an opening came up in the traffic she gave it the gas to go and it started spitting and sputtering as it rolled into the oncoming traffic. As the car stalled, but never cut off, she had the entire two left of on coming traffic stopped as she tried to make it across the interection. She lost her green light and the traffic started rolling up to her side window because she was blocking their ability to go as the car sputtered along at 1mph. Finally at about 30 seconds later and after she stopped all traffin at the red light, the engine smoothed out and took off running fine again,
You never know when it's going to fail.
Usually right after starting it sputters for about 20 seconds. You can press on the accelerator but it just sputters, after 20 seconds it will take off and run great at 5mph-80 mph.

Retired and poorer now thanks to Obama, I can't spend alot of money, but I can spend my pension check on little parts until Obama takes that away too.

Help
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1998 Land Rover Range Rover 66K Miles
1988 300SE Totaled in 1998, hit by drunk driver, but we walked away OK
1989 420SEL 140,000, just warming up. Total by 18 wheel gas truck rear ended, but refused to lose another MB. Had it repaired cost $10,000+ Great Car again SOLD it for a 2003 C320 to save on gas
1991 2500 Suburban 454, 130,000, Best truck in the world. SOLD it out right.
1952 8N Tractor 1,000,000-/+
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  #5  
Old 09-25-2009, 05:41 PM
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Join Date: Sep 2009
Location: Great State of Texas
Posts: 440
An hour of diagnostic time at your local indy shop would serve you very well and probably save you money in the long run.

If it were my car, I'd check idle air control, fuel pump output volume & pressure, and all my of grounds & electrical connections.

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Unless stated otherwise, any question I ask is about my greymarket 1985 380SEL.
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