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martom107
Dodge Dakota
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11/18/2007
17:40:39
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 Subject: miss fire
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Message:
Hi all, i have a big problem with my 2002 dakota 3.9L,--> some miss fire, p0300 p0301 p0303
i have change all spark and spark wire, i have change timer cap, i have change O2 sensor, i have clean fuel rail and all injector, my pump test 40psi and my vacuum stay at 1psi all the time when i am driving, the pickup is extremely weak and very a big drinker on fuel, anyone know what might be the problem? oh and the coil have been replace and not that neither, and both catalic have been test and are in good working condition...
Tom
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dakota49
Dodge Dakota
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11/18/2007
20:43:14
| RE: miss fire
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Message:
martom107, you say "my vacuum stays at 1 psi all the time when I am driving" I think something is very wrong here, you should at least 16 inches of vacuum at idle, when you are driving it could drop to "0" then come back up when you let off the gas.
Have you tried to get the codes out of it? That could give us a little more info to help you with.
Good Luck
Dakota49
1988 3.9 4X4 5speed
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?
Dodge Dakota
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11/19/2007
13:59:15
| RE: miss fire
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Message:
Check vacuum hoses connections to throttle body
and to the manifold below it. Check these hoses other ends. Sounds like leak in vacuum.
Those codes - p0300,p0301,p0302 indicate misfire detected , any others ?
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martom107
Dodge Dakota
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11/21/2007
10:14:28
|  RE: miss fire
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Message:
yes the code was previously p0300 mean general miss fire, p0301 mean miss fire at number 1 cyl. p0303 mean miss fire at cyl. #3
thats mean the miss fire was all on the driver side, so at chrysler dealer they told me, its your fuel pump who do that or your fuel rail that need to be clean, so i start with fuel rail, and all injector have been clean up, and still same thing, so at dealer they say, might be your o2 sensor, so i have my o2 sensor replace on the driver side, have 4 on this pickup, 2 each side... anyway still same thing, but one of the o2 sensor, was burn like if it was burn with a torch so dealer guy say not normal, so they check if catalic was block, and nope they are ok...
now the code i got after all that have been done is p0304 a new code :O damn this pickup starting to be very expensif and seem impossible to find the problem anywhere :(
is it normal that fuel pump stay at 40 at the palce of 50 like a new one?
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martom107
Dodge Dakota
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11/21/2007
10:49:27
| RE: miss fire
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Message:
how can i know if its my muffler who is block? maybe its that one who do me all this trouble, what you think guy?
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shadetree
Dodge Dakota
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11/21/2007
15:26:47
| RE: miss fire
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Message:
If you have a missfire on cyl 1 and 3 I would do a leakdown test or at least a compression test on those two cylinders.
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martom107
Dodge Dakota
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11/21/2007
15:52:53
|  miss fire
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Message:
ok shadetree, i try that on saturday then,
but anyone know if its possible to check my muffler in anyway cause i think thats a big possibility of that...
thanks for all your help guys
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OBIO3
Dodge Dakota
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11/21/2007
17:12:14
| RE: miss fire
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Message:
Disconnect the pipe in front of the cat and drive it. Very loud lol but will come alive if your cat or muffler is plugged.
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martom107
Dodge Dakota
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11/22/2007
09:56:06
| RE: miss fire
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Message:
yes loud i can imagine yes lol, but on the 2002 model, my cat are locate on the Y i have 2 cat, so to check i have to take it out directly at the engine, and some one told me its dangerous for my engine if i take it out so close to the engine :(
so what you think guys?
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dakota49
Dodge Dakota
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11/24/2007
13:57:12
| RE: miss fire
IP: Logged
Message:
martom107, hook a vacuum gauge to the intake manifold, start engine let idle, the vacumm should come up to about 16-20 inches, if it stays there your muffler is ok, if it drops slowly, and will not come back, your muffler could have clogged, or other wise coused a blockage.
Good Luck
Dakota49
1988 3.9 4X4 5speed
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groovie
Dodge Dakota
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12/01/2007
11:25:24
| RE: miss fire
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Message:
So what ever happend with this topic? Im having similar problems. I was getting a p0304 so I changed the4 plugs, cap rotor and wires. I swapped injector 4 with injector 6 and now I got a p0300. I was thinking of cleaning my os sensors with some crc electronics cleaner and seeing if this helps.
Any ideas?
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groovie
Dodge Dakota
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12/01/2007
11:26:53
| RE: miss fire
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Message:
thats was suppose to say plugs not 4 plugs.
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martom107
Dodge Dakota
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12/01/2007
16:11:37
| miss fire
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Message:
well people, it look like its one of the catalytic that is plug for now, work have been on hold for now cause this pickup starting to become addict to $, i have it test with a temp gauge, and the 2 cat have about same temp before and after cat, but the one right after the Y have about 500 degree diference diference before and after , so i will remove that one to be sure it is that one, i sure hope so,
as for groovie, i was having p0300 me too, thats one mean general miss fire, so mean you might have some miss fire on more then one as p0400 was letting you believe, so i suggest you wait a bit and wait till the light come back after you reset it to be sure, anyway as soon as my problem is solve i let you guy's know, i am now only able to go at about 110 km when pedal at the floor :( and when taking a little hill some time drop down to 60km.
anyway keep you up to know guy, thanks.
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martom107
Dodge Dakota
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12/29/2007
10:28:05
| miss fire
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Message:
hi guy, i just want to come and let you all know that problem was the cat that was plug, thanks for all your help and support A+
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Ddog
Dodge Dakota
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7/20/2011
20:20:35
|  RE: miss fire
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Message:
if its miss firing you could also check the pvc valvue its located on the driver side valve cover
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yeah
Dodge Dakota
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7/20/2011
23:47:53
| RE: miss fire
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Message:
Do realize that post is almost 4 years old?
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