Thread: P0301 Misfire Cylinder 1 Help

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  1. #1 P0301 Misfire Cylinder 1 Help 
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    I have a 1999 Grand Prix GT with 170,000 miles. I drove to a basketball game 2 blocks away and it was perfectly fine and normal. After the game I started it up and it was vibrating really bad and the check engine soon was flashing so I knew it was misfiring. So today I started it up to drive into the garage and it was normal again. I checked cylinder 1 and noticed the plug and wire have been replaced before. The rest of the plus are delco but this one is an autolight double platinum 606. Would different plus cause a sudden misfire? Looking forward to your help. Thanks. Here are some pics. Do you think the delco plugs are original from factory?







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  2. #2 Re: P0301 Misfire Cylinder 1 Help 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Blame the platinum plug, these motors hate plats.

    Replace with a delco iridium plug and it should be all good.

    SMGPFC Member #1
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  3. #3 Re: P0301 Misfire Cylinder 1 Help 
    Killa Bee Scottydoggs's Avatar
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    tune up time. plugs and wires for all.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  4. #4 Re: P0301 Misfire Cylinder 1 Help 
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    I agree with new plugs and wires but I was going to try to get by until around spring when it isn't freezing outside. Should it be OK to leave the autolight in until spring? Do you think the delco plugs are still original?
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  5. #5 Re: P0301 Misfire Cylinder 1 Help 
    Killa Bee Scottydoggs's Avatar
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    change the bad plug for now then, should be ok.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  6. #6 Re: P0301 Misfire Cylinder 1 Help 
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    OK, Thanks for the fast help. How do you know if the delco plugs are iridium? It doesn't say iridium on them.
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  7. #7 Re: P0301 Misfire Cylinder 1 Help 
    Killa Bee Scottydoggs's Avatar
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    hard to say but being that one was changed or maybe they only had 5 plugs, so they tossed a plat in there, used cars, who knows right.

    first thing i do to a used car ive just bought is a tune asap. i start my own records.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  8. #8 Re: P0301 Misfire Cylinder 1 Help 
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    I like that idea but I'm a 16 year old with not much money. That's why I love this forum. It saves me money!!
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  9. #9 Re: P0301 Misfire Cylinder 1 Help 
    Killa Bee Scottydoggs's Avatar
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    one plug is like 6 bucks iirc

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  10. #10 Re: P0301 Misfire Cylinder 1 Help 
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    I know, sorry for the misunderstanding. I meant I like the idea of a tune up everything when you get the car but I don't have money for that. Haha. Thanks
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  11. #11 Re: P0301 Misfire Cylinder 1 Help 
    Killa Bee Scottydoggs's Avatar
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    oh i get it, im cheap too lol

    but a tune up and oil change gets done right out of the gate. why would i trust what the last owner says?

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  12. #12 Re: P0301 Misfire Cylinder 1 Help 
    GTP Level Member FriboRage's Avatar
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    41-101 is the ac part number for the plugs you should have in there if they're iridium.

    from the tip of the one ac plug you showed though, they look like platinum. You can see the little spot on the center electrode.
    --------------------------------------------------------------------------------
    2004 Grand Prix GTP Comp G: Intake, F+R plogs + downpipe, 1.7 YT Rollers, Overkill, F-body front brakes, drilled/slotted r1 concept rotors.
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  13. #13 Re: P0301 Misfire Cylinder 1 Help 
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    OK thanks, I think I'm going to order a set of delcos from rockauto.
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  14. #14 Re: P0301 Misfire Cylinder 1 Help 
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    My dad has his Buick that he doesn't drive anymore so I took a plug from it and put it in my car and it still vibrates bad. The weird thing is that when I start it up it is fine and smooth idle. After I drive it around the block it starts hesitating and vibrating bad.
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  15. #15 Re: P0301 Misfire Cylinder 1 Help 
    Killa Bee Scottydoggs's Avatar
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    take the plug wire from your dad Buick too. if that dont fix it, try using one of his coils.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  16. #16 Re: P0301 Misfire Cylinder 1 Help 
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    OK I will try that soon. There is also the possibility that the Buick's parts aren't very good anymore. It has 260,000 miles on it. Just to make sure, cylinder 1 is the front left...right?
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  17. #17 Re: P0301 Misfire Cylinder 1 Help 
    Killa Bee Scottydoggs's Avatar
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    correct. cylinder 1 left front

    if your dads car runs im sure his parts are worth a try, even if its not running, its still worth a shot.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  18. #18 Re: P0301 Misfire Cylinder 1 Help 
    GrandPrix Junkie idrivejunk's Avatar
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    I got this code just the other day and it was simply some bad gas. If you got gas at a different place than usual shortly before this happened, that could cause it.

    41-101, AC Iridium plugs are what I use.
    All Grand Prix, all the time. 69 Model J, 99 GT & GTP coupes. All junk, haha.
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  19. #19 Re: P0301 Misfire Cylinder 1 Help 
    I Write E85 Stickies Frosty's Avatar
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    Do plugs and wires. Its not worth killing your catalytic converter or killing the rings in that cylinder from cylinder washing with raw fuel. Not to mention 20 other bad things that can be caused by an unchecked missfire. 6 cheap plugs at 2$ a piece and a 30$ set of wires will save you alot more money in the future. You dont want to end up like my buddy who drove almost 2k miles with a flat out missfire on cylinder 4. By the time he had me look at it the rings were completely destroyed and it had almost 0 compression on that cylinder. His cat and both 02 sensors were destroyed as well. The problem that caused this all? Plug wire got melted on his exhaust manifold. Car was crushed because it had over 300k on it. The other 5 cylinders had near perfect compression and the transmission felt perfect other then hesitating into 1st. Poor buick.
    "Lets just throw more boost at it and see what happens" -Frosty
    The Defacto Guide to tuning your car for E85. Read it and learn.



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  20. #20 Re: P0301 Misfire Cylinder 1 Help 
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    I got gas at the same place I always do. What's boggling my mind is that it was totally fine then 3 hours later I start it up and it's misfiring.
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