- classifieds - forums

Go Back Forums > Models > Saturn S-Series > S-Series Tech

Thread Tools Display Modes
Old 11-30-2006, 04:52 PM   #1
Junior Member
d4rkf1ber is on a distinguished road
Join Date: Sep 2006
Posts: 21
Question P0303 - Cylinder #3 Misfire Detected

Well I need help / guidance on this. Yesterday I posted the following:

Today I got to another Autozone and they were able to read it. I read the machine and it said:

P0303 - Cylinder #3 Misfire Detected

My problems just started yesterday. However note that about 2 months ago I changed and did the following:

Changed ECTS
Changed Oxygen Sensor
Changed PCV Valve

Did the Mystery oil cylinder thingie as well. Along with regular oil, oil filter and air filter change.

Things were going good since I did all of this for a couple of months now.

Yesterday it started acting weird, as I described in the post. Kinda twitchy, jittery or something.

So, now I have more info thanks to the computer. But to be honest I cant say I know the best and cheapest way to proceed.

I need guidance on the easiest and cheapest things to try first.

I have done some reading and I know the following things are common suggestions:

Check and changed spark plugs - Consensus recommends NKG V I believe?

Spark plug wires? This I just am not sure about, don't know what to check or order from Autozone.

EGR valve? Again not sure how to check it or replace it yet.

Compression tests? Is this hard to do? Expensive equipment? I will ask father in law, retired mechanic for help on this.

So best order to do these things? Quickest and cheapest things are my friends since this is the worst month of the year to have any added expenses.

Any help is going to be greatly appreciated! I will keep reading and see if I can figure some of this out on my own in the mean time.
d4rkf1ber is offline   Reply With Quote Sponsored Links
Old 11-30-2006, 06:45 PM   #2
Senior Member is on a distinguished road's Avatar
Join Date: Nov 2005
Location: Oxford, Ct
Posts: 1,068

2004 VUE 2.2L
2008 AURA XE
Default Re: P0303 - Cylinder #3 Misfire Detected

How long since your last tune up?

If it's been a while maybe it's time to install new plugs and plug wires.
Clean any cororsion off the coil tower tips, that could cause the misfire too.

If you detect oil in your spark plug wells then a new cam cover gasket is in order. Review the how to library; do a search Wolfman has a great how to post there.
Previously Owned 98 SL2, Sold
98 SL, Sold
When your Saturn is well kept YOU are well kept.

Second Car: Buick LaCrosse 2006 is offline   Reply With Quote
Old 11-30-2006, 08:13 PM   #3
Super Member
madpogue has much to be proud ofmadpogue has much to be proud ofmadpogue has much to be proud ofmadpogue has much to be proud ofmadpogue has much to be proud ofmadpogue has much to be proud ofmadpogue has much to be proud ofmadpogue has much to be proud of
Join Date: Sep 2004
Location: Madison, WI USA
Posts: 25,714

1996 SW2
Default Re: P0303 - Cylinder #3 Misfire Detected

^^^^ Ditto. If the problem persists, remove and exchange the two coil packs with one another. After that, the problem will still be a P0303, or you'll instead get a P0301, which is cylinder 1 misfire (the tower that used to serve #3 now serves #1). If the problem indeed moves to #1, that coil tower needs to be cleaned further, or that coil pack is just bad.

You might also have an injector problem with #3. When you remove the plugs, smell each one, and be esp. sensitive to the smell of unburned gasoline. If you do smell unburned gas on #3, that injector could be leaking, soaking the plug.
madpogue is offline   Reply With Quote
Old 11-25-2019, 04:14 PM   #4
prioris is a jewel in the roughprioris is a jewel in the roughprioris is a jewel in the rough
Join Date: Apr 2009
Location: Maine
Posts: 270
Default Re: P0303 - Cylinder #3 Misfire Detected

Recently got P0303 code on 1999 Saturn Sl1. I had to drive 70 miles with the engine sputtering. Made it home.

Found the problem to be spark plug wire. Wire on cylinder #3 was rusted and fell apart when pulled on. Will get it replace. Glad it wasn't a major problem.

Given the age of the car, the wiring connections seem the most vulnerable.
Any other likely wiring connection to get rusted ?
prioris is offline   Reply With Quote


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
How is misfire detected on Saturn SOHC? Tommie S-Series Tech 2 05-07-2009 08:59 AM
P0303 misfire alain173 S-Series Tech 1 04-17-2008 01:18 AM
#3 cylinder no firing P0303 OBD2 code Blammer S-Series Tech 51 03-07-2008 12:13 PM
OBD Code: P0301 Cylinder 1 Misfire Detected hc803 S-Series Tech 16 01-22-2007 12:25 PM
#3 misfire P0303, crewleader1 S-Series Tech 7 03-24-2006 05:22 PM

All times are GMT -4. The time now is 05:37 PM.

Advanced Forum Search | Advanced Photo Search

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2023, vBulletin Solutions Inc. The Saturn Enthusiasts Site.