Question: Bad Spark Plugs Cause P0420

How Many Spark Plugs Do I Need To Replace In My 2002 Benz E320

Looking at a site it says that each cylinder requires 2 spark plugs.Im gonna buy Bosch platinum+4 or the IR Infusion spark plugs(the best I can find unless U have any suggestions)but I dont know if I only need 6 of those b/c it doesnt say that 2 spark plugs are required for those spark plugs.And should I replace the spark plug wires also when buying new spark plugs. ...

1998 Cadillac Code P0420 Catalyst System Efficiency Below Threshold

The service engine light came on and the Code "P0420 - Catalyst system efficiency below threshold" shows up when i use the scan tool. When I read up on it, is says basically to check the 3 oxygen sensors, or the catalytic converter is bad. I put in new Platinum spark plugs in about a year ago. The engine runs fine, nice idling and is not missing. It did say bad gasoline can cause the light to come on. I would be surprised if ...

How Do Spark Plugs Work

I got my car tuned up today and they replaced the spark plugs, and I can really feel the difference! Big time! Apparently I never had them replaced and I have 100,000 miles on my chevy. So my question is: a spark is a spark right? If my old plugs produced a spark how do the new ones produce a "better" spark that makes the engine run better? A spark is a spark right? Hope that makes sense. Thanks :) ...

How Do You Change The Spark Plugs On A 1998 S10

We need to change the spark plugs on the 1998 S10 LS it runs rough and hesitates to start. We tried looking we can see the spark plug wires but cant get the the Spark Plugs they are hidden under the AC Unit we don't know much on cars Other than adding fluids Charging the spark plugs and the battery. How do we access the spark plugs WITHOUT disconnecting anything on the A/C Unit? ...

Do You Need Air Tools To Change The Spark Plugs On An 03 Mitsubishi Montero Sport

I know it is a long process to GET TO the spark plugs. And I mean for this particular make/model. Because it's inside the engine block. I'm pretty sure I do. Just to point out... I need to know about GETTING TO the spark plugs in this car. NOT the spark plugs themselves. ...

Should I Change Spark Plug Wires Since I Am Replacing Spark Plugs

I want to replace spark plugs in my car. Primary reason is it has 80k miles and I think it needs changing. Second is spark plugs are very cheap. Only $2 per spark plug. I was wondering if I should be change spark plug wires as well since I would have to remove them to get to spark plugs. Or just change spark plugs and keep old wires. Bad part is wires themselves are kind of expensive, about $40 I think. ...

What Will Happen If My Spark Plugs Go Bad

If the spark plugs on my car are bad, what is the engine likely to do?? i think it may be my spark plugs but idk, its a 1994 honda accord. they havent been replaced in a while, im not exactly sure how long. i just dont have money to take it to a shop, and im hoping changing the spark plugs will stop the engine from shaking. or spittering and sputtering. however you wanna say it. ...

What Spark Plugs Do You Recommend For My Opel Astra

I presently use 3-pin Borch spark plugs on my car. I really don't know if the vehicle would perform less if I change to 2-pin or 1-pin since I find it difficult getting the genuine 3-pin Borch spark plugs to buy. Are they any other good brands of spark plugs. ...

My Father Has A 1992 Ford Aerostar That Needs New Spark Plugs

However he says the sparks plugs are very hard to get too , what type of tool do you need to get those spark plugs out that sit very far back into the car . The spark plugs sit underneath the drivers seat almost ! ??? ...

Changed Spark Plugs And Now I Hear A Noise

I changed my mustang 07 spark plugs yesterday and started to hear a hissing sound. My sensors do not say anything and usually if something is wrong i am alarmed saying to check engine or something. I tried changing spark plugs well with the other 5 left and it still does it. I havent changes the spark plugs before since i got it in 2007 could it be that because its a new spark plug there is a noise? ...