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Old 08-30-2005, 03:53 AM   #1
wolfman
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Wrench Code P0301 Troubleshooting

I have seen a recent upswing in the number of folks getting SES lights that reveal the P301 code when scanned. (Misfire) I will toss this out as a quick "general" troubleshooting guide with TWO senarios:

Senario #1.
Upon initial start up, cars runs/idles very rough, though usually sometimes only briefly, and SES light comes on. (Code P0301 generated)
In this senario, odds are that a problem exists in the IGNITION system somewhere. Things to check:
1. Spark plugs (non platinum, correct gap)
2. Spark plug wires (cross firing due to age and moisture or oil flooded plug wells in the DOHC engines only)
3. Coil pack towers (corroded)
4. Coil pack to engine bolts corroded at loop connectors

Senario #2.
Car starts and idles ok, cruises ok, but stumbles, jerks and or "misses" during moderate acceleration or hill climbing, and SES light comes on. (Code P0301 generated) In this senario, odds are that a problem lies in the FUEL or EGR system despite what the code suggests. A fault in one of those other two systems may be leaning out the air fuel mixture briefly and causing the misfire. Things to check:
1. Fuel injectors clogged
2. EGR valve sticking
3. MAP sensor vacuum ports clogged/leaking or poor electrical connection
4. Faulty TPS or TPS wiring/connector
5. Items 1-4 in senario 1 (just to be sure)

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Old 03-06-2006, 09:33 AM   #2
Protour
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Default Re: Code P0301 Troubleshooting

With scenario 1, would the rough idle go away after warming up if it's an electrical issue?

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Old 03-06-2006, 10:04 AM   #3
Gerry Proctor
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Default Re: Code P0301 Troubleshooting

Sometimes a scenario 1 will temporarily resolve itself. It has to do with exactly what's causing the problem. If it's a matter of a plug disorder, then many times the plug will begin to fire even though it has failed to contribute to the starting of the engine. It's difficult to light a plug in a rich mixture, such as you would have on a first start. Same thing for the secondary ignition wires.

Though one should look at this bad/okay situation as a severe warning that a tune up is in order and things will only get worse and more costly from this point. If it's just a plug or wire, it will eventually take out the coils as the plugs get harder and harder to fire. That voltage has to go somewhere and even if the system manages to fire the plug, the coil secondary voltage will be far in excess of what it should be, which makes the coils run hotter and live a shorter life.

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Old 03-14-2006, 10:29 AM   #4
Tomvich
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Default Re: Code P0301 Troubleshooting

On Senario 1 & 2 , how would one test an injector ?. Haynes recommends
disconnecting electrical connector and measuring resistance, should be
11.5 to 12.5 ohms for 96 and later cars. I`ve not seen Wolfman
recommend this in past posts. He suggests swapping injectors to isolate
tbl to specific injector. If the injector resistance is off, is this a reliable
indicator to pull rail and replace injector with a 301 code ? I have a
301 problem right now so maybe i should continue this in proper
thread.

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Old 12-14-2008, 07:35 PM   #5
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Default Re: Code P0301 Troubleshooting

It is also my understanding that the most common place for an intake manifold gasket to fail is over cylinder no. 1 leading to vacume leak type symptoms and also result in P0301 code.

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Old 01-30-2011, 02:57 PM   #6
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Default Re: Code P0301 Troubleshooting

Research suggests intake manifold leak is more common problem on SOHC.

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Old 01-18-2012, 02:46 AM   #7
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Default Re: Code P0301 Troubleshooting

Quote:
Originally Posted by Gerry Proctor View Post
Sometimes a scenario 1 will temporarily resolve itself. It has to do with exactly what's causing the problem. If it's a matter of a plug disorder, then many times the plug will begin to fire even though it has failed to contribute to the starting of the engine. It's difficult to light a plug in a rich mixture, such as you would have on a first start. Same thing for the secondary ignition wires.

Though one should look at this bad/okay situation as a severe warning that a tune up is in order and things will only get worse and more costly from this point. If it's just a plug or wire, it will eventually take out the coils as the plugs get harder and harder to fire. That voltage has to go somewhere and even if the system manages to fire the plug, the coil secondary voltage will be far in excess of what it should be, which makes the coils run hotter and live a shorter life
I think this is my problem. The coils. But u just replaced plugs And coils last year. Didnt do the wires though. But I did just replace the plugs
And wires now. And still have either p0301 or p0303. Could my coils have worn out in only a year. I got them from autozone so I'm sure theyre not that great

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Old 03-27-2012, 06:55 PM   #8
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Default Re: Code P0301 Troubleshooting

Wolfman, do you mean I should use platinum plugs?
Or should I stick with copper?

The local Autozone is telling me that the platinum ones will work better.
Is this a sales pitch B.S. or truth?

Thanks!

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Old 03-28-2012, 02:10 AM   #9
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Default Re: Code P0301 Troubleshooting

Quote:
Originally Posted by Spoofdogg View Post
Wolfman, do you mean I should use platinum plugs?
Or should I stick with copper?

The local Autozone is telling me that the platinum ones will work better.
Is this a sales pitch B.S. or truth?

Thanks!
Scratch this question, I just came across your article about the ignition system....
Searching these forums on my phone is WAY too restrictive, I need to remember to search on a physical computer!

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Old 03-30-2012, 02:07 AM   #10
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Default Re: Code P0301 Troubleshooting

Personally the first thing I'd start with on a misfire is a compression check. Bare minimum PSI is 180.

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Old 04-03-2012, 06:33 AM   #11
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nothing else needs

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Old 02-01-2013, 08:00 PM   #12
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Default Re: Code P0301 Troubleshooting

I have a 2002 sc1 SOHC and had a p0301 before. I replaced all plugs and wires and the code was gone for a while. Currently I have been battling with the p0410 code and have done everything short of removing the exhaust manifold to clean the carbon from the inside. Now the p0301 code is back as well.

Since the plugs and wires only have 15k on them, it looks like this code might be coming from the exhaust manifold gasket. Guess while I am cleaning the exhaust manifold I can replace the gasket and hopefully kill 2 birds with 1 stone.

My car did over heat from the engine fan motor going out. Are there any other things to look for that can be causing this?

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Old 02-02-2015, 12:21 PM   #13
mrclean92124
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Default Re: Code P0301 Troubleshooting

Quote:
Originally Posted by wolfman View Post
I have seen a recent upswing in the number of folks getting SES lights that reveal the P301 code when scanned. (Misfire) I will toss this out as a quick "general" troubleshooting guide with TWO senarios
Add leaking oil into #1/#3 spark plug wells due to Valve Cover Gasket/Warped Valve cover. Known to cause arcing and misfire.

Some really good articles in here someplace about diagnosing coil packs. You will want to swap 1/3 and 2/4 coil pack and see if your code changes.

I'm fighting 301 right now and i've stopped my oil leak. That means coil/wires are next on list. I think i will replace plugs, and swap coil packs next...Heaven help me.

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Old 02-09-2015, 06:16 PM   #14
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Default Re: Code P0301 Troubleshooting

I had the same p301 error code problem today. Mine was a consistant misfire at idle only. It was caused by a vacuum leak from the air pump vacuum line by the intake manifold which had blown off. Easy fix today!

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Old 02-12-2015, 07:26 PM   #15
mrclean92124
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Default Re: Code P0301 Troubleshooting

OK, well... sheesh. P0301 is REALLY intermittent. Maybe once every 175 miles.

Replaced wires/plugs/swapped coils, p0301 still popped twice in last 300.

Few things I've noticed:
  1. Usually pops when cold not warm
  2. Every once in a while i notice a rough idle when cold but hasn't caused a code yet. That happens later for seemingly no reason.
  3. I notice when i stop at a light, when cold, it will run 1100RPM then settle down to 800RPM after 15-20secs. I will pay some more attention to this. From what I've picked up on threads, this can indicate vacuum issues.
  4. Watching voltages on my upstream O2 sensor. Seems to pass the test, but I notice that at high rpms it can peg high (1.0V) for a bit instead of constantly bouncing between .1 and .9.
  5. After re-reading all the threads, I'm going to go ahead and do a full compression test. It will have to wait a few weeks, but want to rule out anything even though it's a rebuilt motor/head 40k on motor, burns 1 Q every 4500 miles approx..
  6. I have a relatively new Carter fuel pump from Napa (1 yr)...but I could double check fuel pressure if i get desprate.
  7. I drowned #1 intake manifold with carb spray using little red spray tube, and no change.
  8. I'm thinking swapping the #1 injector next.

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Old 02-28-2015, 08:38 PM   #16
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Question Re: Code P0301 Troubleshooting

I'm not for sure if I'm using this post correctly but...I was wondering if it's safe to drive my car with this code (PO301 -cylinder 1 misfire detected)on for a day or 2. I drive about 18 miles 1 way to work and can't do anything to fix it till Monday . The engine light is on and blinking. The best way for me to describe the sound is it is... muffled.
Thanks
rhberg

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Old 03-07-2015, 11:58 PM   #17
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Default Re: Code P0301 Troubleshooting

Hope this isn't too late a reply - a blinking check engine light is a warning of fuel not burned in the engine and entering the exhaust system to burn in the catalytic converter. If driven this way for about 50 miles, irreversible damage can occur and damage the catcon permanently. A flashing cel should not be ignored by driving any more than necessary to get to a repair shop or home as soon as possible to begin troubleshooting to find out what's wrong.

While there was no reason not to post here, almost everyone like you with an S-series car usually post in the S-series tech forums where the majority post and receive replies. Start a new thread to receive as much attention as needed to have the best replies from as many members willing to help you.

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Old 03-12-2015, 07:47 AM   #18
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Default Re: Code P0301 Troubleshooting

Here are some of the things I did to solve problem:

The misfire from cylinder 1 was the gasket at the intake manifold. Like people said it was wrinkled and was a lot of labor but instead of paying $500 at shop I bought the gasket (I think about $20) and shower a weekend fixing.

The code that caused the biggest problem (can't remember code now but think it was the 301) was tuff to diagnose since none of the free check engine light checks at parts store knew what it was. The problem was the part near the ac compressor that only kicks on the first 15-45 seconds from a cold start. Sorry I don't remember the part name but it is an emission part that helps reduce emission when the engine is first started. It was an easy fix but my problem was I used a junkyard part that must have been bad. Make sure all the hoses are good and connected too because mine was disconnected at top of intake.

Hope this helps. Richpin has a great video on it but my problem was I did everything he said but using a bad junkyard part isn't good lol. Good luck!

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