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Code p0303 cylinder misfire detected

Customer Question
Code p0303 cylinder misfire detected
Submitted: 2 years ago.Category: Buick
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Answered in 5 minutes by:
1/19/2016
Buick Mechanic: Gary, Buick Technician replied 2 years ago
Gary
Gary, Buick Technician
Category: Buick
Satisfied Customers: 17,983
Experience: 15 years master GM tech and mater ASE tech
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can you tell me the year ?

has anything been done yet to correct this issue ?

was anything done to the car that now you have this problem ?

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Customer reply replied 2 years ago

2003 buick

I didn't do anything yet. I have indicated changing the plug, and changing the problem cylinder plug wire with the number one wire entirely. Nothing changed. I gave the freeze frame information to you

Buick Mechanic: Gary, Buick Technician replied 2 years ago

so changing the wire and plug did not move the problem or fix it yet

can you feel it miss ?

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Customer reply replied 2 years ago

Yes. Rythmatic miss at idle

Buick Mechanic: Gary, Buick Technician replied 2 years ago

ok off idle will it miss ?

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Customer reply replied 2 years ago

Not off idle.

Buick Mechanic: Gary, Buick Technician replied 2 years ago

99 % of these that will miss at idle and not off idle are caused by vacuum leaks from the injector lower o-ring or the upper intake manifold gasket or the upper intake manifold itself cracked or the fuel injector itself

if you confirm NO vacuum leaks and show visual spark at idle and the compression matches the other cylinders on that bank then the only thing left would be the injector itself

as if that injector was NOT being told to fire it would miss all the time at idle and off idle

if you have any questions please ask as i do not get credit for my work until you rate us here at Justanswer

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Customer reply replied 2 years ago

I took the number 3 injector out. I have the means to click it open. I blew through it and barely any air came out and a little gasoline drop came out.

Buick Mechanic: Gary, Buick Technician replied 2 years ago

you can either swap it with the 1 or 5 injector and see if the misfire moves or replace it since its out if it just was dripping

you can always get me back through this post for FREE with any follow up with this question even after you rate us here as i do not get credit for my work until you rate us here at Justanswer

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Customer reply replied 2 years ago

Can some carb cleaner clean it out?

Buick Mechanic: Gary, Buick Technician replied 2 years ago

no these can not be cleaned out

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Customer reply replied 2 years ago

I took the fuel injector wire connector loose and ran the engine like that and I didn't notice that much difference, but of course if you rev the engine ... you know.

Buick Mechanic: Gary, Buick Technician replied 2 years ago

swapping # ***** injector physically with the # ***** injector will the misfire move to cylinder # ***** ?

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Customer reply replied 2 years ago

If the stays on the same cylinder after swapping injectors what then?

Buick Mechanic: Gary, Buick Technician replied 2 years ago

ok then can you do a compression test and see if the PSI is the same as 1 and 5 ?

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Customer reply replied 2 years ago

I found a fuel injector connector with a broken terminal on number one. I have to go to the salvage yard to get another one. Not only do I have a plugged fuel injector, but now another fuel injector isn't functioning.

Stupid question: is driving the car in this state doing more damage ?

Buick Mechanic: Gary, Buick Technician replied 2 years ago

the only thing it can do is damage the cat converter with a misfire but that is usually from the fuel pooling up unburnt but since the issue is a lack of fuel it should not hurt anything

you can always get me back through this post for FREE with any follow up with this question even after you rate us here as i do not get credit for my work until you rate us here at Justanswer

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Customer reply replied 2 years ago

I was able to rig the connections on cylinder one. I drove the car with only one inoperative fuel injector. Last night I did switch the injectors like you advised. I got another injector too. Still, after all this, cylinder 3. This event takes place at idle once again.

Cylinder 3 misfire p0303. I looked at the connector on cylinder 3 again. Flush with the connector bottom the wire was perforated. Would that cause what I'm going through now?

Buick Mechanic: Gary, Buick Technician replied 2 years ago

does # ***** show an injector pulse at it at idle using an injector noide light or a test light to watch the bulb blink at idle ?

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Customer reply replied 2 years ago

I dont know how to do that

Buick Mechanic: Gary, Buick Technician replied 2 years ago

if you have a test light with the key ON one terminal in the injector connector should show 12 volts if so then connect your test light clip to the battery ground and when the car is at idle does the other terminal in the connector blink your test light bulb ?

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Customer reply replied 2 years ago

Please gimme some time

Buick Mechanic: Gary, Buick Technician replied 2 years ago

ok

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