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Old 06-27-2012, 01:00 PM   #1
saturn hippie
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Default p0303 after rebuild, rough idle

Did a rebuild on my 01 SL1 SOHC, and now I am getting the p0303 misfire on cyl. 3 and it idle incredibly rough. I have checked all my plugs, wires, injectors, and have sprayed brake cleaner around the intake gasket to check if the seal is good. None of these has solved my issue thus far. Does anyone have any other suggestions on what to do?
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Old 06-27-2012, 02:15 PM   #2
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Default Re: p0303 after rebuild, rough idle

Spark test on cylinder #3? Swapped ignition coils around? Verified #3 injector wetting plug #3? Compression test even after the rebuild? Checked fuel pressure?
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Old 06-27-2012, 02:46 PM   #3
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Default Re: p0303 after rebuild, rough idle

Have good spark on all cylinders, compression is 180 plus across the board, thought the #3 injector might have been the culprit, but after cleaning all of them and swapping then around the conditions persist.
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Old 06-27-2012, 05:07 PM   #4
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Default Re: p0303 after rebuild, rough idle

Plug wires in the correct order? 1234->4123.
Have you checked to see if there's actually current going to the #3 injector?

How are you determining that the spark is good?
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Old 07-01-2012, 01:02 AM   #5
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Default Re: p0303 after rebuild, rough idle

Plug wires are in the correct order. It is my understanding that if the 2-3 ignition coil is having issues then both the 2 and 3 cylinders will have issues. The #3 plug looks like it is burning uneven.
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Old 07-01-2012, 01:28 AM   #6
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Default Re: p0303 after rebuild, rough idle

how's the fuel pressure? #3 tends to be the first cylinder to run lean.
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Old 07-01-2012, 01:07 PM   #7
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Default Re: p0303 after rebuild, rough idle

180+
from what i know about these motors, shouldn't be around 200+ after a rebuild.
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Old 07-01-2012, 01:38 PM   #8
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Default Re: p0303 after rebuild, rough idle

yeah, compression should be 200+ (180 is the service limit, iirc). depends on how the test was performed, though.
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Old 07-01-2012, 01:58 PM   #9
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Default Re: p0303 after rebuild, rough idle

Compression is compression, whether its 180 or 220psi. Ensuring that your rebuild is mechanically correct eliminates pistons, rings, valves, and timing. All by posting another compression test. Move on. Its not a mechanical issue with the engine running rough.

Reusing the old ignition system, fuel pump, fuel filter, sensors, all, can contribute to erratic engine running. The trick is to start eliminating each one according to either a logical sequence, price, used/new parts availability, common sense. Ignition control modules and coils from a junk yard are the way to go. A fuel pressure test can help with any fuel system issues. Sensors will have to be examined one at a time for their importance in relation to specific issues.
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Old 07-01-2012, 02:12 PM   #10
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Default Re: p0303 after rebuild, rough idle

uneven compression can make a engine run like crap. you should know this of all people on here.

my sl2 has all sensors performing as should. yet at idle i am running rough.
my compression is bad and will be needing a rebuild.

ive been on this site talking with oldnuc in PM's for a long time. and we have discovered that the sensors are fine. all wires and connections are fine. most of my sensors, connectors, are new. even a new freshly flashed pcm from the dealer is new. new cylinder head, new timing set, coils, plugs and wires.

this man needs to do the proper compression test everyone else does and it should be thought about after that.
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Old 07-01-2012, 02:15 PM   #11
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Default Re: p0303 after rebuild, rough idle

another question. where you having any problems like this before you rebuilt the motor.
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Old 07-01-2012, 02:32 PM   #12
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Default Re: p0303 after rebuild, rough idle

Every engine rebuild is different from the other and making comparisons gives you tunnel vision without accepting the possibilities of other issues. Since when does one rebuild mean that the sensors on one engine is the exact same sensors on this engine? Do you see the tunnel vision yet? There's no one expert anywhere.....................

When you compare one engine rebuild to another then you already developed tunnel vision. Every engine rebuilt is not the same.
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Old 07-01-2012, 02:44 PM   #13
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Default Re: p0303 after rebuild, rough idle

all im saying if there was no problem to being with before he rebuilt the engine then there shouldnt be any problems now.

i believe there is a mechanical problem.

just have to wait for some answers
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Old 07-01-2012, 02:53 PM   #14
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Default Re: p0303 after rebuild, rough idle

If it makes you feel any better then a dry and wet compression test can be done and accept what's posted and move on.
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Old 07-01-2012, 02:59 PM   #15
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Default Re: p0303 after rebuild, rough idle

sounds like a deal to me.
remember its a learning process for some of us. i will except it if im wrong and learn from it.
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Old 07-01-2012, 03:02 PM   #16
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Default Re: p0303 after rebuild, rough idle

Hey, even 'experts' learn too..................for those that don't have big heads.
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Old 07-01-2012, 10:27 PM   #17
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Default Re: p0303 after rebuild, rough idle

The compression test was performed dry, i put a bit of oil in each cylinder and did the test again they were all around 210 +/-5. have to borrow a fuel pressure gauge from the parts store tomorrow. The reason for the rebuild was i blew the head gasket, drained 2 quarts of oil, and the #3 rod bearing fused itself to the old crank.
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Old 07-01-2012, 10:38 PM   #18
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Default Re: p0303 after rebuild, rough idle

Let's move on now that we understand there isn't any mechanical issue.................
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Old 07-02-2012, 03:53 PM   #19
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Default Re: p0303 after rebuild, rough idle

my apologies.
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Old 07-02-2012, 07:10 PM   #20
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Default Re: p0303 after rebuild, rough idle

Fuel pressure is 45 psi at the schrader valve.
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