Firing Order [Merged 5-7]

[STARION]

forgot firing order. 1990 4G63T.
call the cylander farthest on the passenger side #1. and call the ignition tower farthest from the firewall #1.

thanks

 

[interex]

Well, Kinda... But if the firing order is 3241 then there would almost always be 2 full rotations that go wasted. It doesnt really make sense. If 4 fires and 1 is next that means 4 fires and goes down, so does 1... a full rotation is made as 4 and 1 come back up and 1 is fired... That wouldnt be possible. It just still isnt making a whole lot of sense to me. Dont get me wrong I'm just kind of lost here on this topic.

 

[Supa Dexta]

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That may help you visualize whats going on.

 

[steve]

Lets try to get this corrected.

First. The actual firing order of the 4G63 cylinders is 1342. It's not directly related to the order of the plug wires on on the coils.

Remember that an Otto cycle engine take two rotations of the crank (720 degrees) to complete. In this animated gif the number are the part of the cycle starting with induction, compression, power, and exhaust. The firing order starts with the spark between compression and power (between what it shows as 2 and 3)

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Now imagine four of these inline. (this example fires in a different order than the 4G63, it's doing 1243)

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To spread out the power pulses the cylinders are each 180 degrees apart in crank rotation. That puts cylinders 1 and 4 and cylinders 2 and 3360 degrees apart so that the pistons in those pairs move up and down at the same time. The cam shafts are what put them in the different part of their cycles so that while cyl 1 is in the first half of the cycle igniting, power, and then exhaust stroke cyl 4 is in the second half doing intake and compression stroke. Both pistons start at the top but cly 1 has a compressed fuel mix that the spark ignites where cyl 4 is pushing the exhaust out when it's plug fires again. That spark is wasted because there is nothing to ignite.

So when cylinder 1 is at TDC and the mix is burning, cylinder 3 is at BDC getting ready to compress what it just drew in, cylinder 4 is at TDC and just pushed the exhaust out getting ready to draw in a new mixture, and cylinder 2 just hit BDC on it's power stroke and is getting ready to exhaust it.


Does that help?

 

[interex]

heh, gotcha, thanks for the explanation

 

[92rsAWD4me]

Ok, I'm sure I'll be yelled at but I've searched and read and search and read and am still confused. I have seeena bunch of different posts with a bunch of different 1g firing orders (92laser turbo awd). To simplify this for me... when looking at the coil from the drivers side what wire goes where from front to back? (front being towards the front of the car)

 

[nuclearr]

front 4123 back

 

[92rsAWD4me]

Alright thank you. I'm at work right now but when I get home I'll look and see if its right or not. I'm hoping its not right so it will maybe explain my rough idle issue.

 

[SpyderDSM]

Alright thank you. I'm at work right now but when I get home I'll look and see if its right or not. I'm hoping its not right so it will maybe explain my rough idle issue.

what exactly is your idle problem? do you have / know the engine codes if you have a check light? (if you suspect a problem with your plug wires they might be arc'd)

 

[steve]

Please make it stop.

The sequence of the wires on the coil pack is not the "firing order".

The firing order is just that, the order in which the cylinders fire. On both generation it's 1 - 3 - 4 - 2.
Cylinder 1 is the one next to the timing belt.

The order of the plug wires on the coil packs is normally 4 - 1 - 2 - 3 left to right when you are looking into the coil towers. (from the drivers side wheel well on a 1G or over the radiator on a 2G 4G63)

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If you have 2G DSMlink on anything other than a 95/96 car you need to move the wires to 3 - 2 - 4 - 1. swapplugwires [ECMTuning - wiki]

Keep in mind that because we run a wasted spark, the plugs on a coil both fire at the same time so swapping 4 and 1 or 2 and 3 will have no functional difference.

 

[FORMONTOYA]

On a side for the 2G guys...

The coil pack bracket is stamped 1-4 in relation to the proper cylinder that it goes to (don't know about the 1G). As stated, #1 cylinder is closest to the TB. Also, as stated, if you run DSMLink on a 97-99 you will have to swap the appropriate wires according to the link above.

 

[GSXtacy724]

Just as the topic says guys. I have a 98 gsx but have a chipped 95eprom in the car. Can someone tell me what firing order to use? Thanks guys

 

[eclipseGSTud]

Firing order? Are you talking about the spark plug wires? Do you have inverted CAS selected in DSMlink? Order of the wires are shown below:

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If you need more info about DSMlink check out: start [ECMTuning - wiki]

 

[BoostFrenzy]

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This is what you do after inverting the CAS with DSMLink.

 

[GSXtacy724]

I dont have DSM link or a CAS

 

[DSM_PWR]

I dont have DSM link or a CAS

No CAS?? Hows your car running

 

[gofer]

you do in fact have a CAS (cam angle sensor) and since your running a '95 eprom ECU your firing order is EXACTLY backwards than the stock ecu on your car. just look at boostfrenzy's diagram and re connect your spark plug wires identically to the "swapped" drawing and your car will run correctly again.

 

[GSXtacy724]

OOPS! sorry guys, I dont know what the hell I was thinking when I said that haha. I was thinking about a 95 not having one haha. Going outside to try this right now. thanks fellas!

 

[Boosted98gsx]

You need to, in essence, swap the coils.

 

[BoostFrenzy]

You need to, in essence, swap the coils.

Which in the end comes out a whole heck of a lot better looking then just swapping the wires. I redid them completely with length wire basis and it still looks bad. If you are OCD about your car like I am, then I suggest either a custom set of wires/cut to fit wires, or swapping the coils around.

 

[talontsiboy24]

Service manual says 1-3-4-2 ? Is that correct? Also what is the product number for the ngk splug wires for a 1997 gsx awd? How much do I need to tighten the spark plugs like torque or whatever?

 

[TSiAWD666]

Uh, it's 1-4 2-3

 

[snowborder714]

The torque spec is 18 ft.lbs. but I usually just go tight.

The spark plugs should be 4-3-2-1 (timing belt) on the head. And then 4-1-2-3 on the coil pack. The coil pack bracket should have numbers on it.

NGK wires - part number ME77

 

[talontsiboy24]

The torque spec is 18 ft.lbs. but I usually just go tight.

The spark plugs should be 4-3-2-1 (timing belt) on the head. And then 4-1-2-3 on the coil pack. The coil pack bracket should have numbers on it.

NGK wires - part number ME77

why does the manual of the car say somethin different? also why does everyone gap there plugs .028 when it calls for .032?

 

[snowborder714]

The manual says for a 2.0l turbo that the spark plug gap is between .028 and .030 in.

 

[turbosax2]

The firing order is 1-3-4-2.

http://www.dsmtuners.com/forums/newbie-forum/326706-sprk-plug-wire-question.html#post151771183