Question about 2003 Nissan Altima

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I disconnected the coil packs and after i reconnected them the car wont start back up, what can it be?

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Double check you`ve got plug one connected to plug lead one etc, I`ve done this before only to find that I`ve connected 3 - 1, 2 - 4, 4 - 2 and 1 - 3 and make sure you`ve connected the correct coil pack to the correct trip sensor connected to the flywheel. Have you made sure that there`s a spark. Even if all these things are wrong, you should still get a spark, but it could be sparking at BDC rather than TDC or even sparking on the induction or exhaust strokes. Ian

Posted on Aug 03, 2009

  • Ian Percy Aug 03, 2009

    These systems are called wasted spark where two plugs are fired at the same time, Plug 1 fires in the cylinder 1 that`s beginning it`s power stroke, the other spark-plug which is electrically connected to this plug 4 in a four stroke engine also fires, but cylinder 4 is beginning it`s induction stroke. This plug provides the earth return for plug 1. The roles are reversed when the second cylinder 4 is starting it`s power stroke and the cylinder 1 is starting it`s induction stroke. I hope this helps you to understand the system and hopefully will help you to get back on the road again. NOTE, UNDER NO CIRCUMSTANCES TURN THE ENGINE OVER WITH ANY OF THE PLUGS DISCONNECTED, THIS COULD DESTROY THE IGNITION CIRCUIT IMMEDIATELY, There is no earth to keep the voltage down, and the coil will produce such a high voltage that the power transistor which drives the coil will instantly blow. Ian


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If the car starts before disconnecting the coil packs, it might be the ground connection, have it checked. Check also the connections and the terminals if they are loose.

Posted on Jul 30, 2009


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1 Answer

I changed spark plugs on my 01 jeep grand cherokee it was running but turned off on me now it wont start anymore.

which engine?
2001 WJ , jeep.
wrong spark plugs!
gapped wrong!
wrong wire order?
do tell engine you have there.
do tell park plug brand and numbers.
do tell if engine has coil packs, how many, and how you wired them back..
now answering for USA cars, (not exports. or those jeeps made in Europe. )

the 4.0L engine with the 3 coil rack pack? with 6 spark wire sets?
the 4.7liter has 6 coil packs coil over plug COPS.
that can not be wired wrong but could be unplugged in primary side.

my guess, wrong parts, wrong gap
or not reconnected right.
if spark is lost, scan the PCM cranking, look for DTCs/

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Turn everything, all switches, off then disconnect both battery cables and leave disconnected for 30 minutes. This resets PCM to defaults. Then reconnect ( + ) first then ( - ).

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Did you check or set the spark plug gap before installation, if so then try disconnecting the negative battery terminal and then reconnecting after about three minutes or so, see if that helps.

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The Coil pack hooked up? Grounded? Something didn't get reconnected.

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Check obvious problems first. Do you have any indicator dash lights on when trying to crank the engine? A security light means your Passlock system is malfunctioning. If you can turn the engine, then the battery is most likely ok but you can disconnect it for about 5 minutes then reconnect it which will reset the computer. I had an issue with a 99 grand am dieing after starting. Pushing the key in kept it running. Turns out my ignition switch in the dash went bad.There are three coil packs in the v-6 and two in the 4 cylinder. A loose wire would more likely be the cause. Check the fuses under the hood in the convenience center. A bad computer, module near the coil packs, or a bad hall effect cam sensor could cause the fuel injectors to not fire and cut off the fuel supply. Check the fuel pump to see if its working by turning the key to on but not cranking it. If you hear a 2 second sound of the pump then a click then the fuel pump is most likely working.

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2007 nissan titan turns over but wont start no spark to the plugs .

The problem could be in the spark plugs. Usually if just one of the spark plugs is not producing the spark needed, the engine would still start. It may run rough, but will still start. If none of the spark plugs are producing a spark (or firing) then this could be the culprit.The spark plugs gets power to spark from coil packs.So check the coil pack first.If the coil pack checked ok then its faulty spark plugs causing this problem.Also remove the spark plug connection and clean it and reconnect it and recheck.In some cases this helps. ---------------That's it.

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So I assume you never disconnected the bat. when changing the coil that is not good ....I would say buy another coil pack and start over and make sure to disconnect the bat.......Check all wires going to the coil for breaks or worn or burnt marks in wires before hooking up new coil

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Starts with no idle

When changing the coil pack it's an electronic reset. Disconnect the battery and allow the ECU to reset and reconnect the battery after 10-15 minutes or so and give it a restart try.

Ensure the radio and all power draws are turned off initially.

If it doesn't reset check to see that the pack is plugged in secure and it's the right one for your model.

Also try some fuel additive as it may be a diluted fuel issue that cropped up in the time it took you to replace the pack if it's set for a bit.

Also check your wires, plugs and main ground connection to ensure they're all secure.

Lastly ensure your fuel relay cube didn't short out when the coil pack went as well.

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