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  #1  
Old 11-04-2000, 03:23 PM
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Join Date: Nov 2000
Location: Jacksonville, FL USA
Posts: 113
I asked earlier about my car having very poor acceleration, your suggestions helped quite a bit but I am still having problems. Acceleration has improved but still is slow. This is how the car runs for the most part. If the car is cold it takes about 10 seconds of cranking to get the car going, then it just rumbles along at about 500rpm until it warms up alittle bit, once it has reached operating temp it runs alittle smoother. To get the car moving I have to floor the gas, well this wouldnt be such a problem but the transmission is upshifting at 3000rpm at full throttle. The car feels as if it is starving for gas, and the exhaust has a real strong odor to it. Ill give you alittle info on what I have replaced so far. I have replaced the rotor, spark plug wires, spark plugs, fuel pump, fuel filter, fuel tank strainer, fuel distributor and the fuel relay. I had alot of this stuff replaced at a local mechanic, who I think caused something major to happen to my car. Could the computer controls malfunctioning cause this? Also on a side note, the fuel pump makes this intermittent scratching noise. Thanks for your help so far and I look forward to your replies.

------------------
Adam,
1986 300E
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  #2  
Old 11-05-2000, 12:21 AM
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Join Date: May 2000
Location: Scotts Valley, CA.
Posts: 145
Adam,
Have you tried replacing the fuse in the overvoltage protection relay? Do a search on this board with the words "overvoltage" or "relay". You will find some interesting stuff that might sound familiar to your symptoms...

Also, I remember someone with a car like yours (and mine) that had the electro-hydraulic something or other replaced that worked wonders on the driveability of his car.

Good luck bro.



------------------
Jay Yambrovich
1989 300 E
1992 190-E 2.3
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  #3  
Old 11-05-2000, 01:53 AM
Mike Murrell's Avatar
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Join Date: Feb 2000
Posts: 2,351
Pezzy - you mentioned the cars exhaust has a strong odor? Odor as in excess fuel? That would be the opposite of fuel starvation if you are indeed smelling fuel. If a "mechanic" replaced all of the parts you just described, he's not taking diagnotic measures; but rather, is socking away Christmas cash. My 2 cents.

Regards,

Mike Murrell
'91 300-SEL
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  #4  
Old 11-05-2000, 03:24 AM
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Join Date: Nov 2000
Location: Jacksonville, FL USA
Posts: 113
The reason alot of this stuff was replaced was because the car hadnt been running in a few years. The exhaust doesnt smell like unburnt fuel, it has a real sour smell to it. Also, I was thinking of actually taking the car to the Mercedes dealership and have them put it on their computer. Does anyone know how much this would cost?
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  #5  
Old 11-05-2000, 08:29 AM
Larry Delor's Avatar
What, Me Worry?
 
Join Date: Jun 1999
Location: Sarasota, Fl.
Posts: 3,077
This is gonna sound weird, but stick your finger up the exhaust pipe, and see what ends up on your finger. If its black/sooty, you are definately having a mixture problem. So I suppose your 'mechanic' is on the right track as far as fuel related issues goes (unless your timing is off somewhere in Timbuktu) I'm kinda wondering that some sort of "check engine" light hasen't reared its ugly head. Alot of people like to blame O2 sensors for rich mixtures (including me...I have had to replace several of them in my past cars), and if I had to take a stab at diagnosis just for the heck of it,, I would have that that sensor tested.
I just realised your in Georgia...take it to a Benz mechanic with experience, you have plenty of them up there. (like the fellas that have record amounts of post for instance )
-Larry
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  #6  
Old 11-05-2000, 09:29 AM
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Join Date: Nov 2000
Location: Jacksonville, FL USA
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I am closer to Jacksonville. Anyhow, for some reason I dont see a check engine light on my dashboard anywhere, there are all the usuals, there is an empty space right next to the O2 sensor light. I was thinking my computer systems are all screwed up because my ABS and SRS lights are on, but they were never on before I let that mechanic try to fix my car. Later this weekend I am going to try to replace the over voltage protection relay (which looked like it was ok) and see if that cures my problems and if it doesnt Im bringing the car to Mercedes.

------------------
Adam,
1986 300E

[This message has been edited by pezzy (edited 11-05-2000).]
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  #7  
Old 11-05-2000, 09:30 PM
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Join Date: Jun 1999
Location: Surrey, Beautiful British Columbia, Canada
Posts: 750
adam, i think it is time for you to go to your local MB dealership, and have them analyse what is wrong with your car. here in vancouver, they charge an hour of labor - Can$ 85.00. good luck.
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  #8  
Old 11-06-2000, 11:27 PM
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Join Date: Mar 2000
Location: Here.
Posts: 315
Adam,

The hard starting when the car is cold could be that your cold start injector is not working or your coolant temp sensor is not up to snuff. The car runs without computer in it so once it is warmed up shut it off take the computer off and start it up see if anything changes. You can also check the coolant temp sensor by measuring its resistance. Get the shop manual or the CD, it states the correct resistance values for the coolant temperature. It may also be that car is running in "limp" mode because of some sensor problem. Have it checked out by Benz, however be warned that as soon as they encounter some problem they may not go any further until that problem is fixed. Also the 86 300E have a little adjusting screw for the fuel mixture, it is in that little hole through the airfilter housing, but should not be tempered with without a lambda meter hooked up to the car. Find a competent Benz pro in your area (does not have to be the dealership) and have him look it over. Your average mechanic can and will do more harm then good when it comes to diagnostics.

Alex
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  #9  
Old 11-07-2000, 10:09 PM
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Join Date: Jul 1999
Location: Youngstown, OH
Posts: 150
Read this site and tell me what you think about your problem.
http://www.interject.com.au/sysdiagn.htm

Intruder 1991 300E2.6

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  #10  
Old 11-08-2000, 02:50 AM
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Join Date: Nov 2000
Location: Jacksonville, FL USA
Posts: 113
Well, I have looked at the car alittle more and have done a few of my own tests. I have unplugged the cold start valve overnight, when I went to start the car in the morning it was much harder to start but ran the same as before. When I was doing this, I noticed there was a line missing that goes to the breather hose that hooks to the top of the air filter assembly (Im not sure where it goes to though). I have also looked at the air/fuel mixture adjustment which I couldnt access because it was pushed all the way down and it looked as if someone had stuck a screwdriver in the groove trying to get it out. I am pretty sure the engine is almost drowning itself in fuel because I am getting real poor gas mileage (about 10mpg on highway driving). Is it possible the mechanic may have put the fuel distributor on wrong? I am also pretty sure it is not an ignition problem because when I was initially trying to get the car running, leaking fuel into the intake would make the car run normal.

------------------
Adam,
1986 300E
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