Question about 1999 Mercedes-Benz CLK

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Mercedes clk200 only fireing on two cylinders

Need help with this! i havin bought new spark plugs yet but il be gettin them tomorrow!!

il tell the story first!!

I left the car 4 to a panel beater to get a few scrathes done and get a lip spoiler put on!! it was running perfect before it was left down.( before you say any thing i checked milage when i got there so id know if it was moved and it wasnt) it was left there not moved for about 3 and a half months!! when they started it to do a few bits on it, it ran fine but when they started it the next time it was missin!!

so yesterday evening i took out the spark plugs and just cleaned them and put them back in but still missfireing!!! i thought even if i cleaned them it wouldn missfire for a little bit and id know that was the problem!! then i disconnected the battery for over 5 mins and when i started the engine it wouldn rev up and would let small little noises as if i put the leads the wrong way around!!

it does say service due on the clock but it didn say that when i left it down there and it hasn even done any driven!!

i am goina change plugs but could it be any thing else???

car has only 84000kilometers (last service was 51k)
( plugs thats in it have mercedes stamp so maybe there in it from new)

thanks

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  • Damien R
    Damien R Aug 28, 2008

    thanks for the info il keep ye all informed:D

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  • Master
  • 422 Answers

Hi there i dont know how but i think the crank shaft sensor was damaged or is defective when you disconnected the battery you erased the computers memory for the timing and thats why it did not want to rev up

Posted on Aug 28, 2008

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SOURCE: mercedes clk200 only fireing on two cylinders

hi there it sounds to me like the crank shaft positioning sensor is bad because you say when you disconnected the battery and reconnected it it wouldnt even rev up thats a tell tell sign for the sensor because when you disconnected the battery you erased the memory that the computer used to control the timing

Posted on Aug 28, 2008

  • 414 Answers

SOURCE: mercedes clk200 only fireing on two cylinders

There are several things it could be and not necessarily to do with the plugs.

1. did you reconnect the ht leads in the correct order? They must be in the correct firing order.

2. have you tested the HT leads for electrical continuity? The carbon powder type can breakdown easily.

3. Are the HT lead connectors ok? Make sure you have continuity.

Posted on Sep 27, 2008

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hi there it sounds to me like the crank shaft positioning sensor is bad because you say when you disconnected the battery and reconnected it it wouldnt even rev up thats a tell tell sign for the sensor because when you disconnected the battery you erased the memory that the computer used to control the timing

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Mercedes clk200 only fireing on two cylinders


There are several things it could be and not necessarily to do with the plugs.

1. did you reconnect the ht leads in the correct order? They must be in the correct firing order.

2. have you tested the HT leads for electrical continuity? The carbon powder type can breakdown easily.

3. Are the HT lead connectors ok? Make sure you have continuity.

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