99' ML430 TOPIC: Ignition Misfire unknown if coil or ignition wires??? - Mercedes-Benz Forum

 
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post #1 of 5 (permalink) Old 09-06-2008, 01:50 PM Thread Starter
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99' ML430 TOPIC: Ignition Misfire unknown if coil or ignition wires???

TOPIC: Ignition Misfire unknown if coil or ignition wires???


I had purchased a 99' ML430 about two years ago and had a lot of problems with it, but once I found out that this was the first model that was made for the SUV, I knew that first year models always have an extensive amount of bugs and two or three years later they make the version that will last forever.

Now with this being one day the check engine light came on and I had noticed that the engine would shake when in idle position or slowing down. Whenever I had accelerated a cylinder or two would drop ( I figured it dropped since I lost power). I went to AutoZone and they said I had six codes for miss-firing but they never specified codes. He said that it is either the spark plugs or spark plug ignition wires. I went out and bought the two prong Bosch spark plugs and replaced them all. Well after I replaced these the light had went off. About a Month later the light came back on. The same problem had started with loss cylinders and one morning I had went to start it and it would turn over and no fire. I had went to AutoZone again and i received these codes:

P0410 Secondary Air Injection System Malfunction
P0150 O2 Sensor Circuit Malfunction (Bank 2 Sensor 1, open circuit before cat)
P0155 O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)
P0300 Random/Multiple Cylinder Misfire Detected
P0301 Cylinder 1 Misfire Detected <--- often indicates catalytic converter problem (says BOTONOSI)
P0305 Cylinder 5 Misfire Detected
P0306 Cylinder 6 Misfire Detected
P0307 Cylinder 7 Misfire Detected
P0308 Cylinder 8 Misfire Detected

Now I am trying to figure out if these are the coils that are bad or if it is just the spark plug wire or the ignition wire harnessing set.....

Now if it were the coil I figure I would have prob got an Ignition Coil Primary/Secondary Circuit Malfunction code, which is a P0350 - P0362 code..

I got the codes list off here website is (http://www.whnet.com/4x4/dtc.html) from benzworld.
I had looked all over this site to find similar situations and this was the only one (http://www.benzworld.org/forums/w163...999-ml430.html)

I guess the question is should I replace all the spark plug wires... and then if that does work replace the coils????


Thanks for all that will help.
You can also reply at luebes@msn.com

Last edited by luebes; 09-06-2008 at 01:55 PM.
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post #2 of 5 (permalink) Old 09-06-2008, 02:46 PM
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Your left front O2 sensor is bad...

This should be replaced first, before moving on to other items. The "two prong" spark plugs don't enjoy the best reputation here on BW, but I suspect they are not the main issue here.

The font O2 sensors do the "heavy lifting" for each bank of cylinders; thus if the sensor is shot, you will not be getting the correct mixture for conditions - the probable result is a misfire. Cylinders 5,6,7 and 8 are on the left bank, the one controlled by the bad O2 sensor.

If you changed the plugs yourself, then you may well have damaged the coil wires, if you were not very, very careful.

Keep running the car with the misfires, poor mixture, etc., and you WILL be looking at a new catalyst in the near future...

JR
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post #3 of 5 (permalink) Old 09-06-2008, 03:33 PM Thread Starter
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Thank You, I will try to replace the O2 sensor and see what happens.
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post #4 of 5 (permalink) Old 09-06-2008, 04:01 PM
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When installing...

Quote:
Originally Posted by luebes View Post
Thank You, I will try to replace the O2 sensor and see what happens.
the O2 sensor, if doing a DIY, be careful to keep the anti-seize on the threads only and avoid getting any on the sensor tip, as this can cause premature sensor failure.

Good luck.

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post #5 of 5 (permalink) Old 09-23-2008, 06:19 PM Thread Starter
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Fuel pump maybe???

Alright so I had replaced the sensor after it took a while for it to get ordered..

It was a pretty simple job. But I had went to start it and same thing it had just turned over.
So I tried a couple things. I have spark in the spark plugs as I took them out and tested spark. So I guess it is not the wires nor coils.

Although I had tested the fuel pressure and I am not getting any. I guess this may be the reason why it is just firing... I had took off the air filter and sprayed carb cleaner down there and it had fired up briefly. I checked the relay and that is fine and I tried to knock the tank a little bit but nothing..

So I am assuming it is the fuel pump that is bad. The engine has 155,000 miles on it.

I think I may due for this. What do you think?

Nick

Thanks for your help by the way.

Last edited by luebes; 09-23-2008 at 06:22 PM.
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