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Old 06-14-2018, 01:39 PM   #21
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Join Date: Jan 2013
Location: Lakewood WA
Posts: 358

2001 SL2
2004 VUE 3.5L
Default Re: Code P0301 Troubleshooting

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:

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)
So you dont think it could be loss of compression in cylinder 1 because of mechanical wear?


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