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Old 02-16-2020, 02:32 AM   #1
03saturnaz
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Default 2001 SL2 P304. #4 cilynder or #4 firing order?

P304 code trigered engine light. My scanner confirmed it.

I do have a question, is it telling my cylinder #4 which will be counting from left to right facing the engine, or #4 in the firing order as I've read ?

Thanks for your input.
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Old 02-16-2020, 02:59 AM   #2
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Default Re: 2001 SL2 P304. #4 cilynder or #4 firing order?

So far I have replaced the #4 sparkplug, didn't help.

I connected an in line sparkplug tester and I get constant and steady pulses.

With a sthetoscope, I am able to hear the #4 injector clicking.

I checked resistance on the injector and it reads 13 ohm.

Will continue to to troubleshoot tomorrow.
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Old 02-16-2020, 09:43 AM   #3
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Default Re: 2001 SL2 P304. #4 cilynder or #4 firing order?

Ok, what symptoms are you noticing, did you or do you feel/detect a misfire?
If not, and it idles and performs otherwise, then I would ignore the code and just clear that code out. Perhaps the computer noticed a hiccup and that was the only 1-time issue, but it still sets a code, but may mean absolutely nothing.

If it returns and there is a steady misfire, then double check the sparkplug wire on # 4.
Also, verify that the #1 and #4 wires run parallel to each other all the way from their coil until the shorter #4 attaches to its sparkplug?
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Old 02-16-2020, 09:07 PM   #4
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Default Re: 2001 SL2 P304. #4 cilynder or #4 firing order?

It seems to drive fine, with the expecion of idle while on drive.

Idle on drive the rpms drop to 500 and it feels as if it may stall.

While on park and idle, it idles about 800 rpms but the engine shutters, and shakes.

#1 and #4 wires run parallel to each other.

I cleaned the ignition coils, all terminals and base.

I swapped ignition coils to see if the error would move, it didn't,

I installed new spark plugs and sparkplug wires.

I removed the injectors and swapped #4 with #1.

Drove it and P304 came back.

I sprayed staring fluid around the intake manifold to see if rpms would change, they didn't.

I need to get a noid light and test electricity to the injector, the one I loaned from Autozone didn't fit mine.

I did use a sthetoscope and #4 sounds just like the others, I can hear it , clicking.

Next I need to check for compression.

Anything else I may be missing?
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Old 02-16-2020, 10:12 PM   #5
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Default Re: 2001 SL2 P304. #4 cilynder or #4 firing order?

I was just thinking about how it idles when I come to a stop, rpms drop and it feels as if it's going to stall.

Then leads me to believe is running lean and it has to do more with maybe a vacuum leak. It will test the egr and mass flow sensor just in case.
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Old 02-17-2020, 09:02 AM   #6
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Default Re: 2001 SL2 P304. #4 cilynder or #4 firing order?

Spark test your coils of they have a lot of miles on them and then run a compression test.

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Old 02-17-2020, 09:20 AM   #7
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Default Re: 2001 SL2 P304. #4 cilynder or #4 firing order?

I did a spark test on #4 only and it was a constant pulse. I will test the rest as I should have, and compare. Thanks for the tip.
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Old 02-17-2020, 09:27 AM   #8
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Default Re: 2001 SL2 P304. #4 cilynder or #4 firing order?

I just realized that I sprayed/tested for leaks on the exhaust side, not the intake side. I will do that today as well as compression test.
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Old 02-18-2020, 02:07 PM   #9
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Default Re: 2001 SL2 P304. #4 cilynder or #4 firing order?

Just did a dry compression test, and it is not good:

1 @ 175-180
2 @ 175-180
3 @ 175-180
4 @ 10

Going to call the shop that specializes on Saturns here in town and look at my choices.
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Old 02-18-2020, 02:29 PM   #10
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Default Re: 2001 SL2 P304. #4 cilynder or #4 firing order?

Burnt exhaust valve most likely.
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Old 02-18-2020, 03:20 PM   #11
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Default Re: 2001 SL2 P304. #4 cilynder or #4 firing order?

If I repair this, what else can I work on before fixing it? Is it even worth fixing it? Car has 125 k on it.
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Old 02-23-2020, 04:45 PM   #12
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Default Re: 2001 SL2 P304. #4 cilynder or #4 firing order?

> Car has 125 k on it.

So, Low miles; quite likely worth installation of reman head, but...

Need do careful inspection of underbody.
After 19 years significant rust is possible, depending on conditions & location of driving, and frequency of rinsing undercarriage.

IFF body O.K.; if you like the car, probably worth the repair work.

You do want to know what might have CAUSED the untimely demise....
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