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Ignition coils going bad?

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Old 11-06-05, 08:29 PM
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Question Ignition coils going bad?

Here's a quick question. I still can't get my car to start by itself, or idle, without having pressing down the pedal a little bit. Now, whenever I attempt this and flood the car, I pull all the plugs out and only the trailing plugs are wet, and the leading are just fine.

Is my starting/idling issues caused maybe because a problem with ignition? I was thinking maybe my trailing coils went bad and I'm not getting enough spark or something like that. I've checked every other problem, and everything is fine (as far as vacuum leaks, AFM, etc.) and my car shouldn't even be flooding 'cuz my injectors were cleaned and flow tested, right? I wanna buy some trailing coils, but they're expensive and I wanna get some insight from you guys before I do so. Could the problem be the coils? Or maybe (but hopefully not) the ignitor?
Thanks in advance.
Old 11-08-05, 06:25 AM
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Also...If the coils are indeed the problem, is there anywhere to get them cheaper than Mazdatrix? They're goin for around $140 a piece, even more expensive at Advanced Auto.
Old 11-08-05, 06:40 AM
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You serviced the injectors - good.

First test for a spark on the rear.
Pull the leading plug, with the plug wire connected ground the threads, crank the engine & observe the spark.
Plugs can go bad. Wires can go bad.
Swap plugs & wires front to rear & see if the problem moves to the front.

Coils rarely fail, but when they do the test procedure in the FSM will tell.
Old 11-08-05, 08:54 AM
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Thanks for the advice. I'll test for spark and see if it works. The plugs were new, so I don't think they'd be the problem...
I didn't think it would be the wires, but maybe I was wrong. It's werid, my car runs great, it just won't start by itself and it won't idle, so I thought maybe the trailing coils were bad. I wasn't sure whether or not it would have anything to do with it, but with the flooding of only the trailing plug indications and nothing else wrong, I couldn't think of anything else.

So I just pull out the plug with the wire still connected, ground it, and crank? I know it may sound stupid, but how do I ground it? I've never done anything like this before, so I have no idea...
Old 11-08-05, 10:16 AM
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Originally Posted by NaD00D00
... but how do I ground it? I've never done anything like this before, so I have no idea...
Find a bare metal bracket or stud to act as a ground, that the plug wire will reach easly.
With the plug wire connected, hold the plug threads against the ground so you can see the tip.
Be aware that fuel vapor will be comming out the open plug hole, so ground the plug away from there.
Have a friend crank the engine.

If you like pain - there is the finger test.
Hold one finger on the plug tip and another finger of the same hand to a ground.
Position your arm so when you flinch, you don't hurt yourself too bad.
Have a sadistic friend crank the engine..

Last edited by SureShot; 11-08-05 at 10:21 AM.
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