Faulty Brainbox?

[Tarantula]

Need some advice. Car keeps blowing a spark plug every month since December to now. I've changed all coil packs back to original but problem still persists. Could it be a faulty brainbox? Vehicle is a Tiida so u know how much fun it is to get to the plugs.

[VexXx Dogg]

under what conditions does the plug blow

[Tarantula]

^^ nutting special really. It keeps happening every month since December. The thing is I don't get any check light coming on though. The car would start bucking, when I do the diagnostic i would get "Cylinder 2 misfire" (P0302) and P0011 Valve Timing Cont. When I change the plug for whichever cylinder misfire occured, car would work good for about a month, then the whole process starts again.

[Tarantula]

another thing worth mentioning is that all other sensors are perfect when we do a thorough scan. Everything works as it's supposed to...........

[wagonrunner]

any pics of the old "blown" plugs?
and i'm guessing it's not always the same cylinder?

[Tarantula]

No pics but the plug is clean - no sign of combustion at all. Cylinder misfires thus far have been 2; 2; 2; 3; 4; 1&2; 3.

[VexXx Dogg]

this is a tickler.
inconsistency with blown plugs may not indicate a channel output problem.

You better get it checked by a pro

[Tarantula]

^^ may very well hafta do that.
BTW: the electrician in Montrose on the Main Road, is he good? He said it cannot be the brain at fault and would instead check all the ground wires etc.

[Dave]

neville is supposed to be good

[DSM_05]

First off, what kinda car are we talking about?

Secondly, what kinda plugs we talking about (copper? Plats?)

Third, as Wrunner said, got any pics of these "blown" plugs? If your plug is blown, I'm assuming the ground strap is either disintegrated, or the electrode is fubar-ed beyond repair.

If that occurs, it's more likely you have a major engine boo-boo, rather than an electrical issue.

If the plug has not blown up/burnt up/disintegrated into a paper weight, then something else is up....most likely with your coil packs. If the plug has a functioning ground strap and electrode tip, chances are it should work (unless you have some short or something which is killing your plug internals - hard to believe IMHO).

So the plug shouldn't be "dead" IMHO.

I'd start with getting at least ONE new coil pack, and putting it in at cyl 2, and see if the "blown plug" phenomenon moves around...but does NOT return to cyl 2.

Also, if it does re-occur, switch around the plugs (no new ones), and see what occurs.

[Rory Phoulorie]

First off, what kinda car are we talking about?

Vehicle is a Tiida so u know how much fun it is to get to the plugs.

[Anil_Sooknanan]

poor grounding

[DSM_05]

First off, what kinda car are we talking about?

Vehicle is a Tiida so u know how much fun it is to get to the plugs.

What......couldn't find fault with anything else in the rest of my post?


Yes, I see missed where he mentioned that.

[Rory Phoulorie]

What......couldn't find fault with anything else in the rest of my post?


Yes, I see missed where he mentioned that.

Well thank you too for answering your question. Get your thong out of your ass please! Where did you see me finding "fault" with your post? You asked a question, I gave you the answer. You all people are so juvenile when you are ready.

[Tarantula]

allyuh doh hijack my ched plz!!! LOL!!!!

to answer DSM_05, I used to change both coil pack and plug whenever this issue happened however, I was using generic coil packs. Plugs I used though were the original (iridium). Plugs 1&2 went afterwards. I changed both plugs and car worked fine. Then Plug 3 went. I changed that and car works fine again. I am sure it's not the coilpacks now. The plugs aren't burned or anything. In fact, the plug from the misfired cylinder is clean and shows no sign of combustion. And as much as I would like to try to swap plugs/ coilpacks etc, it's no fun having to always remove and reinstall the fkn intake manifold.

Anyway I dropped the car by the electrician today, but I started getting a bad "Knocking" sound which turned out to be the a/c compressor seizing up. I had changed the compressor bearing on Saturday but now the pulley is not even moving. So I hafta get a compressor installed and then they can start the electrical.

I swear this mudderfukken car is the antichrist!!!!

[Tarantula]

poor grounding

Electrician believes its the same thing. He's going to clean up all the grounds.

[belalegosi]

I dont believe its the brain box.

If it's not a grounding issue...
Try replacing the crank sensor with a known good one. Had similar issue in the past and had me stumped for about a year. Especially since the crank sensor was only 2 months old when it started happening. Crank sensor would intermittently "fail" during operation and the PCM would trip a misfire code since the crank sensor was outputting an incorrect signal.

[Tarantula]

Well I did get the grounds cleaned up, they were not bad however like clockwork, problem resurfaced again yesterday. May try jnqaz's suggestion and change the crankshaft sensor.

[Tarantula]

Cylinder 3 misfire. Changed plug but apparently the coil pack gone also.

[~Vēġó~]

worst fkn car ever!!!!!! every month this goes on is no joke....

If that sensor change does not work I say leave it somewhere and hope to come back and not see it....

[Anil_Sooknanan]

wait i now reading over your problem is that you need oem packs or they will keep blowing.... or fu will do the trick too

[FullStop]

i had a kinda similar problem once, thought plugs were bad till an ignition coil melted...was my emanage, wasnt compatible with my coil system...possibly brain if not grounds.

[~Vēġó~]

wait i now reading over your problem is that you need oem packs or they will keep blowing.... or fu will do the trick too

he is currently using foreign used coil packs....this latest fault is AGAIN cylinder 2 misfire again=blown plug....

[Tarantula]

anybody want a tiida to thief??

[FullStop]

you tried replacing the ecu? be very accurate, dont try a sdm ecu in a jdm car.

[Tarantula]

Anil_Sooknanan I was wrong, the coil pack was good, only the plug had to be changed. Again it's cylinder 2.

[cinco]

try grounding your valve cover to the body of the car

[wagonrunner]

try grounding your valve cover to the body of the car

that's metal or plastic?

[cinco]

the tiida has a plastic valve cover???

[Tarantula]

Anyway I went back to the electrician in Montrose, he is stumped as to why I'm blowing plugs and not coil packs and can offer no further assistance. He says my problem will be mechanical and not electrical. Any ideas??