Question about Mercedes-Benz 420-Series

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I want to make sure that spark plugs/distributor wires,have the right connection,and are at the right place.A friend changed my sp. plugs,and the car is shaking like crazy since then.ALSO ENGINE HAS LESS POWER THAN BEFORE.....What am i supposed to do? The car is an old 1989 mercedes 420.

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Either some wires are crossed or just not connected well. Go to each wire and make sure they are firmly placed onto electrodes. Just grab each wire and make sure you can't just slip them off. If some do slip off, push wires onto terminal and you should hear a click or feel it snap on when you do. If that dosn't solve your problem, the firing order isn't correct. Sorry, I do know know that info.

Posted on Sep 07, 2008


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2001 f150 the stater coil was bad I know this because I had to play with it and then it'd start I put a new one in but it still won't start any suggestions?

check the wires are correctly connected. replace the coil to distributor wire/lead. guessing the vehicle is gas/petrol.
check the distributor cap and rotor for wear/pitting, if you find excessive wear replace them, maybe the plug wires/leads also. There is not much more than this that I can suggest if you are sure that the coil was the problem in the first instance.
To check, remove a spark plug, insert the top end, in the wire/lead so that the conductor is making with the contact in the wire / lead , place the plug and lead very near, but not touching, a metal surface, then crank the engine over, or get a friend/family member to help, and observe whether a spark occurs at the plug electrode. If all is right in the ignition system you should see a healthy spark as the current earths.
If this does not happen please resubmit the query.

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Car wont star up makes rumbling sound and wont start

Could be one of several things. Check your spark plugs and distributor/rotor first off. If the distributor cap has lines inside it, or gray deposits on the inside terminals replace both it and the rotor. I highly recommend NGK Iridium spark plugs... put them in and forget about spark plug issues for 60K miles! Be careful when removing the distributor cap to unplug one wire at a time and place each wire in the proper place on the new cap each time, so you don't get them mixed up. Check your air filter and vacuum the dirt that sits underneath the filter to help it last longer. Changing air filters once a year is recommended to make sure your engine can breathe properly. Look at your vacuum line diagram under the hood and trace every connection making sure there are no unplugged lines or holes,

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My 98 tacoma has a skip to it i changed the plugs in wires still doing it

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How do I change the spark plug of the dodge magnum 2006

· Open the hood and remove the bolts that hold the engine cover in place, if your Dodge comes with an engine cover (depending on model and year). If so equipped, pull the cover off the engine.

· 2

Grab a spark plug wire by the base of the wire and pull the wire up and out of the engine. (You may need to wiggle it back and forth while pulling up on it to get it out of the engine.)

· 3

Trace the wire back to the power distributor and pull the spark plug wire off the distributor. Make a note of the plug orientation.

· 4

Install the new plug wire in the place of the removed one. Match the new wire with the old one to make sure they have the same size. Press the plug wire over the distributor electrode and onto the spark plug firmly, so that the ends are secure. Installation is the reverse of removal procedure.

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Repeat the above procedure for all the other spark plug wires. It is best to change all the spark plug wires at the same time.

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Check your spark plug, wires, distributor cap and finger. If you spark plugs older than 15000ml, replace them. To check your spark plug wires, use a tester (U can buy at any auto store) you hold direct on the wire and a small sparkling will show you if the wire works or not. You can check the wires also with this: use a single spark plug (don't remove one out your engine!), remove the wire from first SP, connect it with the single SP, hold it to ground, let someone start your need to see regular sparks.. do this step by step with all 6 wires. If all wires are fine, check the SP's, If you miss on one wire, replace the wire, if you miss on more than one, chekc the distributor cap and finger. If this items are older than 20000ml or 5 years, replace them.

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I just change the plugs and placed the wires where the old ones were. It runs bad and is sluggish. Now I wish I didn't change the plugs

Be certain the plugs are correct units with the proper gaps, also be certain the plug wires are fully in contact with the spark plugs. There should be a slight "snap" as the wire goes on to the plug. Also be ceratin the wires are in to the distributor too. And always check what spark plug wire goes where. This is an easy mistake to make even when we give it our full attention.
I hope this may have helped,

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I just changed all spark plugs and wires with boash platium +4 spark plugs and boash wires. the problem i'm having it's only firing on 5 not 6, i checked all wires and there in the right places. I have...

1. Double check the connections at BOTH ends of the wires- at the distributor and at the plug. 2. Make sure each spark plug boot has proper connection. 3. Double check the plugs to make sure that they are all gapped correctly and no contamination. 4. Hold each spark plug upright and make sure that the ceramic insulator near the tip isn't loose and sliding down and possibly covering the metal tip..(had this happen more than once) 5. Check for spark at each plug (be careful) 6. Open the distributor cap and double check all the exposed metal connectors are clean. 7. buy one extra plug and change out the suspect plug.

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1 Answer

My truck will turn over but will not fire up.

Depending on your year it could be that your crankshaft positioning sensor has gone out. This is what regulates your spark. For older years, If you have changed out the whole distibutor then you can follow that by changing your plugs and wires as well. To best test this you can take one of you spark plug wires off the spark plug itself and either use a specific light the you plug into the wire or you can use a screw driver being very careful where you place it. If you are getting spark through the wires then you may not have the right gap on your spark plugs or they may be bad. If you don't get spark it deals with your wires or distributor. Best way is to buy new ones and that will fix the problem.

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