How can i tell if i have good 1 bad spark plug in my car?
Answers:
may not be just the plugs, could be plug wires.
When was the last time you had a tune up?
If it looks ok then there is probably something else wrong, Bring it to a garage and have it put on a scan
It's cheap to replace spark plugs. Buy some and change them out to see if thats the problem. It could be a number of things though.
For the cost you may as well just go and buy for new ones, at least then you can be sure, have you done a compression test? it maybe headgasket?
have engine runningand pull off 1 pluglead, if engine runs worse them that plug and lead is ok, do it with all 4, if all ok look for a new car, if you pull one off and nothing happens thats where you problem lies
First check the plug wires. Look inside of the rubber boots for signs of carbon dust. The inside of the boot will be black if it's present. Also, look along the plug wires for white spots. They indicate a voltage leak. Replace the wires if any of these things exist. Now check the ignition coils using a DVOM to see if there is continuity. If all this checks out, you have another problem other than the ignition.
Master tech 40 yrs.
GEEZ, if you went to the trouble to remove and LOOK at them, why not put new ones in?
Fouled spark plugs will fire like new on the work bench, but under the pressure of the combustion chamber they fail, so stop wasting your time agonizing over whether they are bad and put in NEW ones, and new plug wires, distributer cap, rotor too (if your car HAS wires, cap and rotor). MY car has no plug wires.
To check, run your engine, then pull off each plug lead in turn(one at a time) then replace it. When you take one off the note of the engine changes, if the note doesn't change ta da bad plug!
Wear gloves to do this!
You seem to be having a lot of problems with this car, trying to sort them by DIY is obviously not going to work. You need to take it to a reputable garage and get it checked over properly, then decide whether its worth fixing or scrapping!
dude sounds like its time for a complete tune up
hi you can try pulling the leads off one at a time and listen to the engine niose to hear any difference, but be sure to wear rubber gloves or use rubber handled pliers or grips to do this , another problem i once had was the white insulater was broken but could not be noticed till the plug was turned with the electrode facing downwards hope this helps
Yes, if you take out the spark plug and hold the aode (the bent bit) to the engine block and turn the engine over. You should see a bright blue spark jump from the cathode to the anode. If it does not, try it on another High Tension Lead (spark pug wire) to see if it is the plug or the lead. Dont forget though that you may wish to hold it with insulated pliers or something, the lead should be well insulated but you never know if the insulation has broken down. Hope this helps.
Could be the spark plug wires or the coil pack is common for these cars!! Buy one brand new spark plug, detach one spark plug wire at a time and put the new spark plug at the end of it and hold the end of it with plyers that are insulated against something metal on the engine and have someone crank the engine see if there is spark!! Make sure the original spark plug is just left in the engine! Try this on every wire if there are two that don't have spark then one of your ignition coils need replacing!! Good luck!!
What tests have you had done? Who did them? Did they not test the plugs? Is it mis-firing?
Could try substituting plugs one at a time with one known (new) good one. Best idea would be to get a professional to check it out for you.
re gap your plugs make sure theyre all gapped the same. also might do a compression check on it .
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