Hesitation after spark plug change - Mercedes-Benz Forum

 
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post #1 of 5 (permalink) Old 05-22-2012, 06:10 PM Thread Starter
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Hesitation after spark plug change

Hello,



My car is hesitating on take off from stop and accelaration on the highway. I also noticed a puff of white smoke coming out of the exhaust on cold start and only on cold start. I took the car to MB and was told I need new spark plugs becuz #6 was misfiring. After watching the DIY for W211 spark plugs, we change the plugs, new cabin & air filters, injection cleaner. During the spark plug change we noticed the plugs were wet. The smell of fuel was really light/faint.


The next day the car ran better but still had some hesitation on acceleration. But the motor vibration was only a little better but still had white smoke. We check the wires to insure they were on snug, added some 100 octane fuel to help clean the injectors but still have vibration/hesitation.


Need some help!! Any Ideas. This year: new crank position sensor, transmission fluid change, transmission seal changed, new valve body (last week).
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post #2 of 5 (permalink) Old 05-22-2012, 08:08 PM
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In good practice, when there's a misfire, plugs/wires are swapped to see if the misfire moves to the new cylinder.
Is the Check Engine Light (CEL) on? Buy an OBDII code reader to read the error code(s) logged in the car's computer. What was the brand/model of spark plug used? Was the gap checked before installation? Was only #6 replaced?
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post #3 of 5 (permalink) Old 05-23-2012, 09:35 PM Thread Starter
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The CEL is on and has been since before the spark plug change. The plugs were all replaced with Bosche 7422 F8DPP33 which are the OEM per my manual. We did switch a couple of plugs and the sound and vibration were alot better.

Today the car became a lot worst compared to yesterday. The hesitation was back along the the vibration in the engine. The white smoke continue on cold start even though it less smoke.

I took the car to Advanced Auto and the codes read: PO301-306 Misfire Cyl 1,3,4,5. P0715 Random Multiple Cyl Misfire Detected, PO300Turbine/Input Shaft speed sensor A Circuit.

I will not drive the care again until I know what wrong with it. Don't want to make the problem worst. Could this be a bad fuel regulator pushing to much fuel to the injectors?

Need help sending alot of money this year on my baby it I'd least like to get it right and save some money on repairs to use for Fuel.
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post #4 of 5 (permalink) Old 05-24-2012, 10:55 AM
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The spark plugs might need to be gap'ed to specs.
Or it's the MAF (Mass Air Flow) sensor may be failing to cause all misfirings. It's an expensive part to try it out. If you have a friend with the same model, you may swap with his/her MAF to see if the codes go away. I think there's error code for MAF but who knows.
A trip to the auto parts shop costs $5 in gas. Buy your own OBD reader, only $20 for a simple one but that's good enough. The car's computer stores all codes. They need to be cleared before test run the car so you don't get misguided with old plus new codes.
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post #5 of 5 (permalink) Old 05-24-2012, 11:56 AM
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I would test the ignition wires for resistance. Replace any that are out of alignment with the others.

I'd get a FT reading as well. Codes for this kind of thing only tell about 1/3 the story.

The P07xx codes...I'd check the TCM for fluid incursion, you may have the leaking adapter that is shorting the TCM.

You won't find a cheap code reader at the local store, only online. It's a worthwhile investment, $23 at Amazon.

Good luck.

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