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#1
01-26-2007, 07:43 PM
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Open to suggestions, #2 misfire
On our 200 ML320 with 65k miles, I got a simultaneous rough idle and check engine light. Code says 0302, misfire on #2. ( I actually looked, and the cylinders are marked 1 through 6. What a concept)
I installed new plugs, Bosch Platinum 2's, checked resistance on plug wires at 2k ohms. I then cleared codes and on restart the CEL came on, and the same codes popped right up again. I pulled off the coils for #2 and #3 and swapped them. Cleared codes, and same results. I am looking for suggestions as to the next steps, or in their absence, a referral to a good independant shop in the Hayward/Oakland California area. 
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#2
01-28-2007, 05:27 PM
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sameo sameo
Same exact thing here.
Ordered new STOCK Bosch plugs. replacing my 5000 mile old Bosch platinum 2's. Are you in a cold weather state ? ( Michigan here ) Mine runs ok until its 32F then get some misfire codes. PO302 the most often. I understand there is more resistance in cold weather and the cheaper Bosch dont cut it. I will Update tomorrow after I install the New Stock $12 a pice Spark Plugs. 2/2/7 because of the single digit tempatures we in Michigan are experiencing, I only replaced the plugs in CYL. #2. I still has a little occational stumble at idle.
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Steve Danville what i did myself. CPS rear shocks MAS x 3. SparkPlugs (twice) Fuel pump & Filter Window switch replaced both failed horns with Honda horns. Cleaned ERG Tube Oil changes Oil consumption Fix Brake Pads A/C Recharge Anti-Freeze change X 2. Front Shocks. Monroe. $90 Mercedes Warrenty Work: Harmonic balancer,power steering clamp. Cat converters.Drive Shaft Bearing.s Replaced Outer Lower Tie Rods and front lower ball joints at 156,000 miles Last edited by sdanville; 02-02-2007 at 06:43 PM. Reason: update
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#4
01-29-2007, 10:57 AM
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Which Cyl ?
It wasnt number 2 was it ?
Seems with the ML320 the PO302 is popular. Thats my most reoccurring code.
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Steve Danville what i did myself. CPS rear shocks MAS x 3. SparkPlugs (twice) Fuel pump & Filter Window switch replaced both failed horns with Honda horns. Cleaned ERG Tube Oil changes Oil consumption Fix Brake Pads A/C Recharge Anti-Freeze change X 2. Front Shocks. Monroe. $90 Mercedes Warrenty Work: Harmonic balancer,power steering clamp. Cat converters.Drive Shaft Bearing.s Replaced Outer Lower Tie Rods and front lower ball joints at 156,000 miles Last edited by sdanville; 01-29-2007 at 10:59 AM. Reason: spell error
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#6
02-05-2007, 05:06 PM
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Hey there Mr Speilberg. What happened ? Any fix ?
It has been Zero degrees F in GR Michigan so I only changed the plugs in Cyl #2. Idle not too bad but still not a smooth idle.
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Steve Danville what i did myself. CPS rear shocks MAS x 3. SparkPlugs (twice) Fuel pump & Filter Window switch replaced both failed horns with Honda horns. Cleaned ERG Tube Oil changes Oil consumption Fix Brake Pads A/C Recharge Anti-Freeze change X 2. Front Shocks. Monroe. $90 Mercedes Warrenty Work: Harmonic balancer,power steering clamp. Cat converters.Drive Shaft Bearing.s Replaced Outer Lower Tie Rods and front lower ball joints at 156,000 miles
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#7
02-09-2007, 09:51 AM
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For some reason, the Mass Air Flow meter will set the misfire codes. I would bet it is the culprit. I think NAPA now sells the insert for the MAF device, though you may want to buy it from a dealer to get the one year warranty.
Fall out on NEW MAF units is said to be approaching 20% Jim in Phoenix
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#8
02-09-2007, 10:05 AM
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Jfree 20% ? Mass air flow sensor failure.
I would guess higher.
Where do you get your stats ? I thought the sensors wore out only a hair better then tires.
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Steve Danville what i did myself. CPS rear shocks MAS x 3. SparkPlugs (twice) Fuel pump & Filter Window switch replaced both failed horns with Honda horns. Cleaned ERG Tube Oil changes Oil consumption Fix Brake Pads A/C Recharge Anti-Freeze change X 2. Front Shocks. Monroe. $90 Mercedes Warrenty Work: Harmonic balancer,power steering clamp. Cat converters.Drive Shaft Bearing.s Replaced Outer Lower Tie Rods and front lower ball joints at 156,000 miles
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#10
03-06-2007, 08:17 PM
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How much is the ignition cables, I have a 2001 ML320 about 61,000 miles. Just changed power steering pump, fuel pump. cost me about $1500.
I dont think I can take it anymore if I have to change any more expansive parts. Thinking of getting a 2004 ML500 from dealer so I can get the extended warranty to cover any repairs..
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#11
03-06-2007, 08:24 PM
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check EBAY
Buy your stuff on line and do it your self and you would pay 25% of what you paid.
Thats what these forums are for in my book. Step by step instructions. Next week I change the trans filter and fluid.
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Steve Danville what i did myself. CPS rear shocks MAS x 3. SparkPlugs (twice) Fuel pump & Filter Window switch replaced both failed horns with Honda horns. Cleaned ERG Tube Oil changes Oil consumption Fix Brake Pads A/C Recharge Anti-Freeze change X 2. Front Shocks. Monroe. $90 Mercedes Warrenty Work: Harmonic balancer,power steering clamp. Cat converters.Drive Shaft Bearing.s Replaced Outer Lower Tie Rods and front lower ball joints at 156,000 miles
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#12
03-07-2007, 03:23 PM
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I am wandering if you have read the following thread. Although it might not have exactly same symptoms but very educational thread on engine misfire.
http://www.benzworld.org/forums/w163-m-class/1260892-engine-problem-asking-help.html?highlight=misfire+%232
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