Question about 1995 Mercedes-Benz S-Class

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I put regular fuel instead of premium in a 96 mercedes s420 now it;s running rough abd code misfire cylinder 7. I tried to guess which spark plug it is "no luck" but i changed back and forth no change. Do u think this problem will go alone? what should I do after I filled it up with premium again?

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  • solom123 Sep 10, 2009

    do u know which one is cylinder 7, as i spend all night guessing with no luck? it's a 96 v8 s420

  • solom123 Sep 10, 2009

    for some reason I think it is the coil, would a low grade gas ruin the coil?

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If the problem goes away after filling it up with premium then don't worry. But you should preform a tune up given the cars age.

Posted on Sep 10, 2009

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Add a fuel injection system cleaner,and take it for a good run on the freeway.

Posted on Sep 10, 2009

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3 Answers

2000 Jeep Grand Cherokee Laredo 4.7 liter code reads p0307 turn the car off when I turn it back on started misfiring and sputtering and wont stay started now help


code p 0307 is misfiring on no 7 cylinder ====causes --- engine mechanical fault ---wiring---ignition/ fuel system--injector --ECT/MAF sensor---ECM
look for low fuel pressure or ignition control module

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Eng code p0355 and p0305 2007 mbz ml350 eng runs rough but after restarting runs ok.


p0355 indicates that engine misfire is present.

p0305 indicates that the misfire is in the cylinder number 5

Have the spark plug tested/replaced and test the cylinder number 5 spark plug coil.

Jun 09, 2014 | 2007 Mercedes-Benz ML350

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Head gasket or intake manifold gaste again 96 k1500 5.7 vortec. starts runs idles and drives rough it likes to **** while trying to drive almost as if it wants to stall out. i put my scanner on it and


The website has software that looks for obscene words.
I would think a compression test would show if the cylinder is having mechanical problems. And yes the intake or head gasket could be leaking again, especially if the intake or head were warped or cracked.
Have you checked fuel pressure ?
Does the spark plug for cylinder 5 show signs of coolant leaking into the cylinder ?

Feb 09, 2013 | 1996 Chevrolet K1500

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2003 mercedes Benz C240 codes P0300, P0301, P0302 and P0303. Please, help me how to fix?.


P0300 Random Misfire Detected
P0301 Cylinder 1 Misfire Detected
P0302 Cylinder 2 Misfire Detected
P0303 Cylinder 3 Misfire Detected
according to this fault codes first mark ignition coils
3 ---------------- 6
2 ---------------- 5
1 ---------------- 4
RB-------------LB
this right banks and left bank, please remove Ignition coils with lids and spark plugs from right bank and swap with left bank, if fault code change as
P 0304 Cylinder 4 Misfire Detected
P 0305 Cylinder 5 Misfire Detected
P 0306 Cylinder 6 Misfire Detected
You can Identify it's a faulty ignition system then next swap ignition lids from ignition coils be careful each coils have two lids one short and other long bit deference and when you remove and fix it to the car keep in mind correct order because each coil two different fire for two spark plugs don't mix up, if you mix it can create the fault code.if you detect any fault ignition coils or spark plugs or lids replace that and also whether god or bad recommend to replace spark plugs, find the right that's most important thing, if this way couldn't found the any ignition fault next step is check fuel presser, when the engine running fuel presser must be around 4.5 bar without engine running must be 4 to 6 bar if the fuel presser too low need to check two different things one is fuel pump other is fuel injectors, in this case you can swap injectors from right bank to left bank and find is the injectors leaking, if not leaking faulty fuel pump.is this information helped you? if yes please leave a comment,

Oct 15, 2010 | 2007 Mercedes-Benz C230 Sedan

1 Answer

2004 jeep wrangler engine code P0301


P0301 - Cylinder 1 misfire detected........P0302 - Cylinder 2 misfire deteced, and so on........so either it is a current misfire, which you would be running on 4 cylinders instead of 3, or it is an intermittent problem.......i will provide some possiblities,,,
- ignition system (spark plugs, leads, coil packs)
- fuel system (injectors, ecu etc)
- running out of fuel
- low compression

Basically, if your vehciel has not had service for a while, change the spark plugs, and engine oil, and give her some loving, tender care....

However, if it is regularly servicedm there might be a bigger problem.....

More info required to help you.

PLease vote if you liked this response

Aug 23, 2010 | 2004 Jeep Wrangler

2 Answers

Intermittant p0302,p0305 codes misfires


A code P0305 may mean that one or more of the following has happened:
· Faulty spark plug or wire
· Faulty coil (pack)
· Faulty oxygen sensor (s)
· Faulty fuel injector
· Burned exhaust valve
· Faulty catalytic converter(s)
· Running out of fuel
· Poor compression
· Defective computer

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires , distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad, especially given you had water issues. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced.
I've also heard in other cases the problems were faulty fuel injectors.

Nov 10, 2009 | 1996 Oldsmobile Cutlass Ciera

4 Answers

2000 Acura TL misfire codes


My TL would do the same, crank, crank, crank, give it gas, crank, etc, then finally, after everyone was looking at me like i was crazy, it would eventually start.
I noticed that strangely enough during this time, I filled up w/ regular gas at the same Exxon 3 times n a row, instead of going to shell like i normally do. (I used regular from shell or chevron in mine for 8 years & never a problem) Oddly enough,it would drive ok, kinda rough, for a short time then, i would walk out a store & it wouldn't start. I would give it gas while I was crankn it sometimes even until a cylinder would misfire & make that pop. when it would finally idle, just barely enough for me to put it n drive, i would step on it to keep it going. I even rode around for a week with that scanner hooked up to my car & the only code that EVER came up was cylinder misfire & only if i had to get on it & make it misfire. I put that fuel injector in my gas tank every time i filled up for about a month after the exxon fill ups & went back to shell & put plus instead of regular. We checkd the fuel pump, fine, the fuel filter, doesnt have one.
I have been fortunate to not have it happen since then but, I did some research on it & found that it could also be that the valve that controls the emissions, it would sometimes get stuck & not open/close properly thereby causing the engine to not be able to receive or give off the correct amount of air flow & therefore it wouldnt turnover to start until i would force it by giving it gas or making it misfire, or waiting a while for it to cool off.
Also, check out ur air compressor & make sure its not starting to go out. turn off the ac & see if it still sounds like ****. if it sounds better when its off then the fact that its going out causes it to pull more on the engine in order to keep it going. This could be why its running rough, like feels like its having trouble shifting in 3rd & 4th gears.
Just some advice I found helpful when I had the issue, dont know if its the cause of ur issue but, i thought I would let u know.....
I hope this helps ..... good luck!

Aug 09, 2009 | 2000 Acura TL

1 Answer

96 old bravada multiple misfires


Check for bad spark plug wires or wires connected to the wrong cylinder.

May 29, 2009 | 1996 Oldsmobile Bravada

1 Answer

Engine light comes on - Code shows P0300 and then


OBD II 300 Random/Multiple Cylinder Misfire Detected

When the misfire monitor detects a misfire, it will trigger the check engine light with the specific cylinder number as the last digit in the P030X code. For instance cylinder 1 misfire is P0301, cylinder 2 is P0302 etc. In this case we have either multiple cylinders misfiring, or the computer simply can't determine the specific cylinder, and as such we are left with the P0300 in computer memory.

Possible Causes:

Fuel injectors, related wiring, sensors and computer issues
Running out of gas, or poor fuel quality
Evaporative emissions system (EVAP) concerns: fuel vapors leaking into engine
Incorrect Fuel Pressure
EGR system concerns: leaking EGR valve or restricted ports
Base engine concerns: low compression, valve train problems and timing issues
Ignition system concerns including, but not limited to:
Faulty spark plugs
Faulty coil or related wiring
Ignition module or related wiring issues
Ignition related sensor faults or wiring issues

Apr 04, 2009 | 1996 Dodge Ram 1500 Club Cab

1 Answer

Check engine light on, engine running rough


evaporator is part of the fuel system, missfiring could be spark plug or bad coil

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