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Old 02-22-2011, 08:41 AM   #1
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Cylinder 4 missfire

Ok I finally connected my car to a diagnostic computer and read p304 cylinder 4 miss fire check the plugs n wires even tho they are brand new also change the coil still same problem. I'm guessing I may have a bad fuel injector maybe or vacuum leak . Got. A 2000 v6 with 138,000 miles on it drives real good but has a lost of power and has a vibration and hesitation at low rpm on 1st gear and 2nd gear also my ac compressor does not work has a bad freon leak some one give me some advice on why I get cylinder 4 misfire

thanks
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Old 02-22-2011, 08:49 AM   #2
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Try spark plugs. Mine did the same thing. I replaced spark plug and it worked fine. If it's not that u have bigger problems unfortunately.
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Old 02-22-2011, 09:28 AM   #3
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It's not the plugs there new i even switched the sparks plugs n wires with another cylinder and connected to computer again and still the same code came up . Still cylinder 4 misfire so it's not the plugs or wires
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Old 02-22-2011, 09:34 AM   #4
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Quote:
Originally Posted by BigSteve305
It's not the plugs there new i even switched the sparks plugs n wires with another cylinder and connected to computer again and still the same code came up . Still cylinder 4 misfire so it's not the plugs or wires
It might be fuel injector if I remember correctly. Or maybe u need to replace the cylinder which would suck
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Old 02-22-2011, 09:39 AM   #5
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Quote:
Originally Posted by Joshy

It might be fuel injector if I remember correctly. Or maybe u need to replace the cylinder which would suck
Ya that's what I was asking i think it's the fuel injector or a vacuum leak. To replace the cylinder it would be a big job. How much u think a mechanic would do that job for
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Old 02-22-2011, 10:30 AM   #6
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Quote:
Originally Posted by BigSteve305

Ya that's what I was asking i think it's the fuel injector or a vacuum leak. To replace the cylinder it would be a big job. How much u think a mechanic would do that job for
Oh idk 80$ maybe. Just an educated guess
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Old 02-22-2011, 10:33 AM   #7
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Maybe more like 100. Lol. Not totally sure.
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Old 02-22-2011, 10:59 AM   #8
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Quote:
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Oh idk 80$ maybe. Just an educated guess
I hope it's only that much
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Old 02-22-2011, 03:38 PM   #9
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Re: Cylinder 4 missfire

Have a compression test and leak down test done. You may have multiple issues that are possible. Are you a a good tech?

BTW you can just swap injectors like plugs
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Old 02-22-2011, 03:41 PM   #10
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And replacing cylinder is very expensive. I talked to a mechanic. But I'm guessing he's right and it's multiple little things
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Old 02-22-2011, 04:45 PM   #11
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Quote:
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Have a compression test and leak down test done. You may have multiple issues that are possible. Are you a a good tech?

BTW you can just swap injectors like plugs
How do u do a compression test and leak down test and no I'm not a good tech I'm learning bug my dad and friends are
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Old 02-22-2011, 05:13 PM   #12
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Re: Cylinder 4 missfire

Quote:
Originally Posted by BigSteve305 View Post
How do u do a compression test and leak down test and no I'm not a good tech I'm learning bug my dad and friends are
You will need a few tools. Talk to your dad's friend and let him show you. It would confuse you if I explained it on here. It's rather simple.
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Old 02-22-2011, 05:15 PM   #13
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Re: Cylinder 4 missfire

This guy does well explaining a leak down test
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Old 02-22-2011, 06:47 PM   #14
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Quote:
Originally Posted by BigSteve305

How do u do a compression test and leak down test and no I'm not a good tech I'm learning bug my dad and friends are
There's a compression gauge tool u remove the plug from the cylinder in question and hold that gauge in it... Unplug coil as to not turn over the car and have someone turn the key and let it turn about five times and read the gauge for the amount of compression your getting
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Old 02-23-2011, 07:01 AM   #15
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Thanks a lot guys I'll try this with my dad this weekend
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Old 02-24-2011, 09:40 AM   #16
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Quote:
Originally Posted by Mustangguy0202

There's a compression gauge tool u remove the plug from the cylinder in question and hold that gauge in it... Unplug coil as to not turn over the car and have someone turn the key and let it turn about five times and read the gauge for the amount of compression your getting
What does the compression test check for?
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Old 02-24-2011, 10:36 AM   #17
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Quote:
Originally Posted by BigSteve305

What does the compression test check for?
Compression in the cylinder. If there's low compression then u know u have a bad cylinder
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Old 02-24-2011, 10:55 AM   #18
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Re: Cylinder 4 missfire

Which could either mean, piston rings, valves, valve seals, ect.
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Old 02-24-2011, 12:22 PM   #19
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Quote:
Originally Posted by SaleenFiend
Which could either mean, piston rings, valves, valve seals, ect.
Ok thanks and a leak down test is to see if u have a vacuum leak or is there more leaks that be can check?
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Old 02-24-2011, 07:02 PM   #20
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Do a compression test on that cylinder and see if you have compression.
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Old 02-24-2011, 07:07 PM   #21
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By the way you are talking you have changed everything coil , plug , wire and still same thing. I'm saying it a dead hole. If you want to rule out the vacuum leak put a smoke machine on the car and see if you see smoke pouring out of anything . And if it comes out of that cylinder then you know you have a problem.
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Old 02-25-2011, 09:15 PM   #22
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Re: Cylinder 4 missfire

I have the same problem in my 99 v-6. New coil pack, wires, plugs, injector cleaner, etc. It's a well maintained car but this problem is driving me crazy.
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Old 02-25-2011, 09:49 PM   #23
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Do a compression test on that cylinder. Pretty sure you will find that you a dead hole
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Old 02-25-2011, 09:56 PM   #24
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Stuff like that could happen to anyone even if motor is well maintained. You might have drop a seat on the valve
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Old 02-25-2011, 09:59 PM   #25
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Just be glad you don't have a 5.4 motor. Your just driving down the road a boom you blow a plug throw the motor.
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