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Re: daughter drove over a pothole and noticed the car...
Diag. in central illinois it would be about 80.00. the front would be .9 labor hours the rear coil 1.8 labor hours or both 2.6 labor hours. coils are about 140.00 each. The spark plug replacement will be about 2.7 labor hours and the plugs should cost about 11-12 bucks each. Find out what they charge per labor hour for maint work and multiply that by the labor hour. Keep in mind that there will be some over lap of labor if they do all of it together ask them for that.
I agree with motor1258 whats going on? Did hitting the pot hole jar the wire loose or did it have nothing to do with the problem to start with? odd.
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Sounds definitly mechanical. Also symptoms of spark plug failure or ignition failure of sort, spark plug wires, cap , rotor or coil, or coil pack, ignition module, etc... Therefore the shaking and rough idle. Also a loose terminal at the ECM (computer) would also cause the (miss-fire).
No, you may have got the ignition system wet. The flashing check engine light indicates an ignition misfire. You probably need a tune up including some spark plug cables. It may run better when it dries out, but it will come back again when it get's wet.
Teddydear200, I was running on 4 of 6 coils, the driving and running of the car was ridiculous, I thought my baby was dying. The mechanic suggested the ignition control module, I replaced it and am back to getting up to 90 mph easily and the car runs smoother. Since you've done all that other stuff, give the ignition control module a try as the person above me suggested. I think that really is your problem. - J
If the shaking is caused by the engine missing (a misfire on 1 or more cylinders), then check your (a) spark plug wires - pull each and check for continuity/faults/burn marks/etc., (b) spark plugs - pull each & check for fouling/faulty/etc. Another good check for spark plug wires is to park in a dark area at night (open garage with the lights out works), run the engine and observe the engine operate in the dark - little lights caused by faint arcing means that the wires are leaking electricity to the engine block, instead of delivering it to the spark plugs, like they should. Your particular car has a Distributorless Ignition System (DIS), consisting of an ICM (Ignition Control Module) connected to an individual coil pack for each pair of cylinders. You'll need a HEI (High Energy Ignition) ignition system tester (about $30-$45 any auto parts store) to test these coil packs, which I have found quite easy to replace (usually a couple of 10mm cap screws). Since the car shakes only when accelerating or going uphill, I tend not to think that suspension components of the car are at fault.
If there is none of spark at each spark plug when you crank the engine. Assuming that you checked the spark like that, unless you have other way in doing this, then the problem is the ignition module. The spark at the secondary coil is only generates a spark at a spark plug if there is a pulse voltage at a primary coil. The pulse voltage is not there then there is no spark. The one generates the pulse voltage is the ignition module when the starting is in action. Hop this can help.