Yes, the spark plug wires with the boot. You have to make sure you push down hard enough on the spark plug so that it clicks on to the spark plug. So there is a good connection for current to transfer through. With my previous car, one of the spark plug wire boots wouldnt connect correctly to the spark plug. (didnt make the click sound when pressed down) So as a result I would get a lot of misfire and stumbling.

Why do the EVO motors have their spark plugs gapped soo low? If stock we boost at ~19 psi then shouldnt .035 gap be more than enough? Generally you gap lower with more boost, but too low of a gap results in bad gas mileage.

General rule of the thump is you gap high, and then continue regapping smaller in increments of .002 until you reach 0 spark blow out.

 

no offense, but where did you learn this? if your car is not hesitating at .025 (stock) it doesn't make sense to re-gap any smaller.
Also, too big of a gap will make the car hesitate. too cold will cause carbon build-up and foul. specially, if it's your daily driver
you have to find the balance. trial and error. plus really knowing how to read your plugs is the key. logging your car will help as well if you have the equipment.

here, read this.
http://www.ngksparkplugs.com/techinf...200&country=US

 

evilevo22, what did you do to your car prior to the problem? was your car running fine before the plugs install?
check all your wiring connections i.e. clips/connectors on your coils.

 

yeah car was fine just i was going to change plugs and the oil and now i have this problem.

 

how do i know if the coil pack is bad how can i fix this problem

 

I went through all this a while back, save yourself the time and get some new iridium plugs...

 

I think u need to re-read what he wrote. he didnt say start out out .025 and work ur way smaller.

I dont think its ur coil packs...thats just too wierd to happen while changing ur plugs. But if ur worried it is...the easiest way is to try some one elses.

 

whats the best iridium plugs do i need 7's or 8's.

 

NGK BPR7EIX, take your time when you gap them so you don't break the tips...

 

I didnt say regap smaller from .025 . I said start with a larger gap and slowly make it smaller until your car has no more spark blow out. Thanks, EVOllie. T

For example start with .040 gap and keep readjusting (smaller) until your engine runs good with no spark blow out.

But my question was for evo drivers in general not specified to the thread starter for his troubles.

My previous car dodge srt-4, (although a different motor) came from the factory with a .050 gap on the spark plugs. Stock the car boosted 15 psi and stage 2 would boost up to 19 psi. Even with stage 2, the plugs gapped at .035-.038 was more than enough as well as being the recommended Mopar gap. Very rarely big turbo cars and stage 3 would gap as low as .032 depending on how much they were boosting.

This is why I ask about such low gaps on the evo. Maybe one of the reason people are having such bad gas mileage is their spark plug gaps being too small?

 

it depends on what you have in your car. if you are stock stick with #7 iridium. i don't think you'll need #8 since iridium 7 is slightly cooler than platinum 7 and copper 7.

evilevo22,if you have not done anything to the car... what brand of gas are you running? did you just filled it up prior to changing your plugs?

it's a shot in the dark question. but, i just remember a friend of mine had a similar problem and it was a bad gas. it happened to him a day after he filled up his tank. i narrowed it down to a bad gas by using a few gallons of "76" 100 octane.

bluevoix, my bad on that one. i did not mean to sound like an ***. my apology.

 

Oh, no problem. Dont take my reply that I made the wrong way either. We're all here to learn and share.

 

im going to try NGK BPR7EIX tomarow if i still have the problem ill check to see if tis the coils. whats the best way to see if its the coils

and no my car is not stock i have basic bolt ons beside cams. running 21psi

 

one way to check if its he coil, put a blanket or something on your valve cover, lay each plug with the coil/wire still attached to it, do each plug at a time, have your buddy crank the car over, and just look to see if your getting a nice solid spark, dont want to run the car with 1 spark plug out for too long, just checking to see if you have a nice solid spark. (dim garage is best) do 1 plug at a time and compare.

 

i couldnt find bpr7eix anywhere what are some other quality iridium plugs. any other ideas on what could be wrong.