Thread: Is there something wrong with my ignition coils?

Wow, you are just focused on those coils. Listen, if a coil was bad it would throw you a misfire code. And that would give you check engine light, but since you don’t have a light it really can’t be a coil. But hey I have been wrong before. If it makes you feel better go buy ONE coil (~$40) and a cheap multi-meter (~$15). Also, there are a million of these cars finding a coil won’t be hard, don’t sweat it being in stock. You only need one, because for all 3 to be bad would be like winning the lottery two weeks in a row. If you buy the meter get back to me and I’ll take the time to write out the test, but don’t worry it is easy to test them.

If I was there looking at your car this is what I would do. #1 check the fuel pressure at key on, and at idle. #2 Clean the throttle body. Most ppl totally neglect the throttle body maintenance because the car is fuel injected right!?! What happens is carbon (and crud) build up on the outlet of the throttle causing it to stick. This is also very easy to clean. Just unplug the throttle body cable. Spray in carb cleaner using your finger to hold open the throttle plate. Clean the walls and plate thoroughly, and that will eliminate this area as a potential cause.

On a side note I have been thinking about your corroded battery, that is a little odd for a few reasons. First off your car isn’t very old, a battery should last at least five years. So that’s a little odd but not unheard of. Secondly, a little corrosion is not a reason to replace it. Now if the battery had shorted a cell, or something then sure replace it. Thirdly, the PCM controls the alternator, so getting much of any corrosion seems odd to me. My car is an 08, I have never gotten one spot of corrosion on any battery connection. But for you, definitely check all your battery connections and the ground connections on your fender well and tranny.

All this is leading me to a theory and another question. You might have a charging system failure/problem. Here is the thing, normally the PCM tells the alternator how much voltage to put out. And will charge your battery at all engine speeds. But here is the twist, if you alternator isn’t charging you can (for a lack of a better word) override this action by revving your engine. Most alternators will “self excite” at ~2500-3000 RPM and this might be keeping a bad voltage regulator or a bad alternator limping along. What voltage is your DIC showing? Also, if you get the multi-meter you can test the alternator output yourself under the hood. Also, have you done any modifications to your car? Especially any electrical mods like a different radio, adding an amplifier, or HIDs ?

You might want to read this.
http://www.grandprixforums.net/consi...ing-34923.html

Dude I’m not sure what you’re saying. Did you replace all the coils, and now it is running well? If so, I find that hard to believe, unless you maybe had a spark plug wire lose or something.

Cleaning the throttle body is easy. Take a screw driver and remove the air intake tube, the tube just after the air filter. The throttle body is the valve like thing attached to the engine with a big multi-cable going to it. Disconnect your battery, and then unplug this cable. Use your finger to hold open the throttle plate, spray the carb cleaner like I said earlier. Then reverse the steps.

As far as modding your car for more power, well good luck. There isn’t a lot of meaningful mods you can really do on an 07 with out first starting with a PCM replacement, which I’m warning you will be painful experience. One of the only “good” mods you can do without a PCM replacement is put in a HV3 insert from ZZP. It is actually a pretty easy job, but does take like 3 hours.

First off, holding back information like that is one way NOT to make friends here. It is beyond me why anyone would even mess with the coils on a nearly new car. And then put some old a$$ parts on it. My last GP I had for 6 years and never touched the battery or the coils, what are you doing to your car!?! If in fact you really ever did have a problem, I doubt it is fixed.

As far as moding your car, I already gave my opinion on that but I’ll bite on your new questions.

#1 Your car all ready has an equivalent to a ZZP stage 1 throttle body. And PLEASE stop calling it a bottle all the flipping time!

#2 Putting a new intake on won’t give you measurable (or felt) improvement. Leave it like you have it, stock with the K&N filter.

#3 A new down pipe might give you little something, but IMHO isn’t worth the money. The U-bend restriction on the down pipes of older GPs is already gone on your car.

#4 Not many people with 07s have replaced the PCM, but it has been done. That said, I’m also not aware of one case were it went smoothly. And of course no one seems to want to share this information a whole lot. I was just reading on 3800tech someone did it. But they had to go through the PCM and address a bunch of codes it was throwing, including blocking out un-needed air injection.

Seriously, you haven’t a clue about what you’re even asking. You need to read like every sticky on this forum before even asking more questions.

Oh, and your welcome.