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#1
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86 190e sudden acceleration problem
Greetings and Salutations
After repairing & driving a 1986 190e I bought last spring for $900.00 from the previous owner who owned it over seven years- a new issue has arisen. The engine is rock solid/ around 100k miles (speedo gears mushed) with new timing chain. This car would accelerate to 90 m.p.h. plus, with plenty of power and have put about 6,000 miles on it since my purchase. I've gone through the engine wiring harness an patched and replaced its bad spots due to cooked insulation, re soldering new wire to all of the connections and tested the harness for continuity. I have gone through the Vacuum lines replacing brittle hoses with high temp silicone. I have spray tested the vacuum system with carb cleaner and WD 40 while the engine was running, and believe I have all the holes plugged. The car was running great until the Brake Lining warning light came on, of which I change the Brake Pads but didn't have new sensors to put on. I just clipped off the old sensors – the warning light shut off. At the same time this happened the wedged grommet, which attaches the throttle cable to the throttle assembly had pulled out of the throttle assembly. Some genius, whoever worked on this car before me put the throttle wedge in backwards so the throttle cable pulled this wedged grommet from the throttle linkage's square hole. I have rebuilt, straightened and aligned the throttle/Bowden assembly as outlined in the W201 Service manual I downloaded and reassembled everything. I have been messing with the length and tension of both cables and believe I have whole set up aligned correctly for maximum throttle response. Yet since the cable debacle, the car now acts lethargic as if it were in limp mode. The car revs to around 5500 rpms, without load. But when driving I can't ring out more than 3500 rpms when running through the shifts, with a top end of 60 mph. It acts like I'm pulling an anchor. I have also tried advancing and retarding the distributer without any noticeable improvement. We have had a cold snap (around zero degrees) and the car's acceleration has worsened from lethargic to pathetic, and appears to be temperature related. When I got the car it had shifting problems and believe it was because the wrong tranny fluid was filled. I drained the torque converter and tranny, replacing the filter, and used the The Walmart High mileage Dextron II oil with a bottle of Slick 50 Tranny treatment. Within a hundred miles of driving, the shift shudders ended and the car shifts like new. In fact I have to adjust the modulator pressure to soften the shifts I also use Mobil One High Mileage oil with Bosch filter in the engine, and plenty of the correct type Zerex Antifreeze, to 35 below. I've run Sea foam and isopropal alcohol through the fuel system. I have replaced the CIS-E computer with another working unit I had in my tool box with the same Bosch numbers, from my other 86 190e project car with no improvement. The only reason I am trying to keep this junk running is because it is the best car in snow that I have had in twenty years, and plan to strip and use the parts on my premium 86 190e w/5-speed project when it has outlived its usefulness. Thanks for viewing – the Benz Sage. I |
#2
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Could it be the brakes are sticking since the new pads were installed? your 190e is good in snow? Mine slides all over the place.
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#3
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86 190e sudden acceleration problem
That is a good guess -- They shouldn't be, and I scraped all of the Caliper contact points of rust, new self locking mounting bolts, derusting and adjusting the the emergency Cable mechanism -- without re-attaching the broken cable, and lightly lubed critical contact points. The rotors were good and within tolerance.
I will jack it up quick and test the drag on the wheels, but if I put it in neutral, and coast down the road while rolling, there doesn't appear to bind. |
#4
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In the Snow
In the snow, I love the car.
It weighs as much as a small whale - is under powered, is RWD, and is good on gas. I run four snows mounted on the junk MB Factory wheels for braking traction – a trick I learned the hard way while living in the Vermont Mountains.. If the car goes into a slide, it slides like a drift car. With RWD you can control the slide because of the drag, even in neutral. The engine has enough pedal-stab power to spin the rear tires in snow without over spinning. In 1988, I had a Buick 3.8 L Automatic FWD that broke traction slid uncontrollably and smash into the ditch. Even in neutral, the drag from the drive shafts prevented any steering options .What really scared me was, this uncontrolled skid could of crossed into the oncoming traffic. This winter after loosing patience with wimps sporting 4WDs clogging the driving lane of I-39 @ 20 MPH, within minutes after the plow had cleared, I pulled into the passing lane of which was unplowed and about 16”, and passed 40 cars. The car never shuddered, didn't slide around or broke traction. I was able to pass @ 40 to 45 MPH with stability, no fear and was literally plowing snow. MB's design in weight distribution across the chassis makes this car a true drifter in the snow (small minds-small pleasures). The car doen't have ABS, another feature my other 86 190e has, and I hate. |
#5
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Continuing CIS-E troubleshoot
I just pulled the good OVP Relay from my other 86 190e and installed it. I tried soldering the old OVP's terminals but think it was still weak
The new OVP Relay helped a little, but now the the car is running rich. I had to unplug the cold start injector solenoid or the car would flood with gas until it loaded up and stalled within a minute of start up. I pulled another cold start injector from my 88 parts car and will change it if necessary, but I believe it maybe a CIS-E related. I also noticed that now, when I start the car, the vacuum (economy) gauge will move about a third of a gauge of vacuum when cold. Is this common ? – I don't remember my 86 5 speed doing this at startup. Is this the cold air valve fudging up or the signaling process? Also I found a circuit diagram for Automatic transmission up shift solenoid that interacts with Wide Open throttle switch on gas pedal, from a Benz website. Would this circuit have anything to do with the car's lack of performance? (some type of internal conflict?) I realize that someone can't expect much from a $900.00 car, but I am trying to learn the CIS-E related problems, so when an immaculate 300 series comes along with CIS-E problems, I can beat the owner up on the purchase price. I have had an 82 Rabbit convert for over 5 years, and have never had problems with the mechanical CIS, but am impressed with the fuel economy of the CIS-E. Benz Sage Last edited by Benz sage; 02-10-2010 at 10:51 PM. |
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