Hey! I have a 95 benz s320 that is driving me crazy. Let me give the whole history of the car. The lower harness was fried the car didn't want to start, so i rewired the lower harness and still the car didn't want to start, so i took out the spark plug drop some oil on each cylinder to boost up the compression then the car started right up. And now i am having problem with the car loosing power when i am driving at high speed on the high way doing like 80 and the car loose power. When i floored the gas pedal the car is not moving. I check the ETA and the wires were fried also, so i sent it to bba to get rebuild i install the ETA thinking that my problem was solved and still the same problem the car keep on misfire, so i took it to a tech shop who only specialize in german cars. He put the car on the computer and he got cylinder 2 and 5 misfire so he told me my problem was the harness and i asked him if he was sure and said yes. We change the harness still the same problem, changed fuel pump and relay, 3 new coils, spark plug and wires, mass airflow sensor, cranshaft sensor, fuel filter, air filter, 02 before the catalytic converter, fuel rail including all the injectors and the car is still loosing power when i drive at high speed and still misfire on cylinder 2 and 5. He said the timing was off a tooth he adjusted it and still the same problem. compression is good, and no leak on the intake. He said the ecu is not good the fact then when the car act up cylinder 2 and 5 as well as injector 2 and 5 don't work. We got another ecu still same problem. When the car loose power when i drive at high speed after 20 miles and come to a complete stop, it stalls. if i restart it the engine shakes like crazy because two cylinder don't work. If i disconnect the battery terminal for a few and plug it back the car will give me another 20 miles at 80 mph and do the same thing again. Floor the gas pedal and the car is not moving. I was wondering if anyone have an input of what might be the problem because the car is misfire. if i reset the misfire and drive the car for a few the code came back. And i am also having a problem with the car on first gear it jump beside all the rest of the gear are fine. The trans code says upshift delay switchover solenoid. i was wondering if it's a big job

This is code 26 correct? This is nothing to worry about. The Mercedes have this "feature" so they don't let the car up-shift till the transmission fluid is a little bit warm. I have driven my (ex) 95 E320 with this code for 45000 miles, never any issues.
For the rest of your issues...I don't know. looks like you have done everything possible to resolve it. Perhaps someone else will share some knowledge.

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Billy Connolly

I think so, now it's jumping on first gear now, beside that all rest of the gear are fine. for the misfire i took the car to a mb tech and even them having hard time to solve the problem and i spent around $1400 and problem still no solve, so the tech is charging me for guessing i should of guess myself and i wouldn't spent that much. No one seems to have an idea what is causing the problem. I think i'll just junk the car or part it out.

When he changed the wires, did he change the stubby sticks that go right under the ign. coils?? Some techs just assume those never go bad when they do. Make sure on that... My car had that problem. Also, check the wires that go from the Ignition module to the ignition coils.
Another cause I have heard about that is the over voltage protection relay....

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'95 S320 LWB
'87 300SDL
'04 E500 wagon 4matic

He changed everything the engine harness, spark plug and spark plug wires including all the boots. What's is weird is when the car lost power after driving at high speed and i come to a complete stop it stalls, i have to disconnect the battery terminal for a few to fix whatever is causing the problem until another 20 miles. If i reset the misfire after i drive like two blocks it comes right back. Cylinder 2 and cylinder 5 don't work the car act up that's why he said it was the ecu and the car is still doing the same thing after we replace the ecu.

try a new OVP relay then... If you're that far into it, might as well try that as well....

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All it takes for evil to prevail is for good men to stand by and do nothing.

Too many people tip toe through life, never attempting or doing anything great, hoping to make it safely to death... Bob Proctor

'95 S320 LWB
'87 300SDL
'04 E500 wagon 4matic

My car don't come with the OVP relay. I think it has a computer that have some fuse on it that replaced the ovp relay i change the computer as well because i had purchased the all set of computer from ebay and still getting the same problem

sakpase, take your 1995 S320 to a MB dealer. The Service Department will be able to diagnose the problem properly. Once you learn the root cause of the problem seek a refund from the MB tech who randomly replaced parts without resolving the problem.

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Fred Hoelzle

They are using the same computer the dealer is using. And they only repair german cars and can't find the problem. I wonder if taking it to the dealer will worth it, because they use the same star computer and can't find a solution, by the way i don't think they will give me my money back easily. I think i would have to take them to court to get my money.

MB don't know anything either. My dad has 94 E420 that has a rough idle and he took it to MB and they hooked up STAR to it and didn't find any problems. They suggested they would change the wiring harness and start from there. ---> I'm sure they would have liked to do that job.

That's exactly what i am worried about. Is to take it to the dealer and spend $150 and they can't see what caused the problem i think i'll just part this car out or trade it, so what did your dad do with his car?

Did anyone do a compression test?

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Prost!

All those parts - were they OEM?

Have you tried downshifting to a lower gear and running at the same RPM you experience when you're going 80 to see if it's road speed or engine speed related?

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A.S.E Tech A1,A6,A7,A8 & MVAC 609 + EPA 608

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

The tech did a compression test and told me the compression test was good. I didn't tried downshifting to a lower gear. When he reset the misfire code and i drive the car for a few the misfire come right back. I was wondering if the misfire could be because of a defective crankshaft sensor since i changed it before the problem started happing and does the lower harness have something to do with it because i had rewire it myself. It's only since 2 and 5 that is misfiring.

The dealer does know their stuff. And so does the STAR system.
The problem is the wiring harness.
It is the only component on the car that will create intermittent mystery problems.
Until you replace it, you cannot properly diagnose anything.

That's why I refrain from any 93-95 Mercedes....