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Pete
Dodge Dakota
7/19/2001
08:50:41
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 Subject: what causes cylinder misfire?
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Message:
the check engine light went on in my 97 Dakota v6 5 spd - the code was 43 - cylinder misfire on #1, #2, #3, #4, #5, or #6 - obviously, its not all of these, because i can still drive my truck....
the dealer checked it out, and said that #3 and #4 fuel injectors are not working all the time....
i was just curious - what else could cause misfires? obviously a bad plug, but i installed 3923 plugs about 4 months ago....
also, will FMS fuel injectors work on this vehicle? would those be the 24# ones for a "normal" engine? Bernd?
Thanks for any help - this truck is going to drive me to drinking with all the problems ive had in the last 6 months....
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hookedon4.7
Dodge Dakota
7/19/2001
09:07:59
| RE: what causes cylinder misfire?
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Nothing wrong with drinking!!!
I don't know about the injectors. But, I would check the simple stuff first. Since, the plugs are "new" then I would check the plug wires and go from there. Does it "Back fire" thru the intake? If it does more than likely it's Ignition or timing. I would bet on ignition though.
Good luck
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Pete
Dodge Dakota
7/19/2001
09:38:03
| RE: what causes cylinder misfire?
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Message:
plugs, wires, NAPA cap and rotor, all new 4 months ago....
theres one more thing - which, i think backs up what the dealer said....
if 2 of the fuel injectors dont work, then that would explain my increase in gas mileage!
i get at least 50 more miles to a tank now than i did when the truck was working "correctly"....
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Todd
Dodge Dakota
7/19/2001
10:37:48
| RE: what causes cylinder misfire?
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Message:
Actually, I would think the milage would go DOWN, because you'd be giving it more gas to get less power. Face it, with a V-6, loosing two injectors means you've now got a 4-banger, and only about 2.6L if functional displacement! Not to mention the other two cylinders doing their compression/exhaust strokes still, so your engine effectivly would make less power than the 2.5L 4-banger through friction and compression on the two dead cylinders.
It sounds a LOT like ignition timing, or possibly mixture problems. If your running too rich, you can get "detonation" once the engine warms up. Try reseting the PCM (Streatch I know, but it's easy and fixes odd things), if that doesn't do it, get the injectors done. Heck, if they are bad, they need to be done anyway!
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Todd
Dodge Dakota
7/19/2001
10:40:55
| RE: what causes cylinder misfire?
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Ah! Another thing, make sure the cap and rotor are seated properly and there is no mositure under the cap! IE: Pop it off and spray it with WD-40, which will displace the water and dry pretty quick.
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hookedon4.7
Dodge Dakota
7/19/2001
10:52:32
| RE: what causes cylinder misfire?
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if the dealer told you it's the injectors-then why are you here asking for help?
If all the ignition parts are "new" then I'd try what Todd said. If that didn't work I'd be getting the injectors done. Does it Backfire thru the intake? If you floor it does it make a loud popping noise from under the hood? If so check ignition or timing. Don't know what else would cause it-Unless you put the plug wires in the wrong firing order?
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Pete
Dodge Dakota
7/19/2001
10:53:50
| RE: what causes cylinder misfire?
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Message:
Thanks for all the ideas - ive already reset the PCM, and the check engine light appeared again about 30-40 miles later....this weekend, ill check all the plugs, wires, and moisture under the cap....if that dont fix it, then ill be looking for injectors!
im trying to find out if the dealer is trying to pull a fast one on me - they want 700 bucks to replace all the injectors!
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shawn
Gen III
 
7/20/2001
00:16:27
|  RE: what causes cylinder misfire?
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Message:
Dude, screw that! You could buy after market matched FMS 24#'s for $200 and change. OR you could get high flow matched 19#'s (similar to stock) for even less!
www.summitracing.com
Shawn
98 5.2L4x4 CC
PowerDyne @ 10PSI
Gibson Dual Cat Back
JBA Ceramic Headers
And a lot of other goodies
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Pete
Dodge Dakota
7/20/2001
08:19:12
| RE: what causes cylinder misfire? Shawn?
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Message:
will the FMS 24# fit exactly? i dont know much about fuel injectors....
this is what i want to do - in case a few years down the line i decide to put a Powerdyne on....
how difficult is it to replace fuel injectors? anybody?
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carl
Dodge Dakota
JOIN HERE
11/09/2002
23:22:44
| RE: what causes cylinder misfire?
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I have a 97 Jeep with the 5.2L and I'm getting a cylinder 1 misfire code. The wires, cap and rotar are new and I have an MSD 6A ignition. I already replaced the fuel injector but the code still comes up. What could be causing the fault code? Can anyone help?
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Michael
DakotaEnthusiast
11/10/2002
01:29:18
| RE: what causes cylinder misfire?
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Just cause the plugs are new doesn't mean jack. I'd still check them out first anyway. Did you wash the engine down before this started to happen, if so water getting on the wires could foul a plug.
Good Luck,
Michael
Z-Tube, R/T Rims, SSB Rear Disc Conversion, Alpine Head-Unit, Infinity Kappa Speakers, SilverStar Headlights, HO Cams & Intake installed.
Got H.O. ?
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family_of_6
Dodge Dakota
JOIN HERE
4/11/2003
22:01:46
| RE: what causes cylinder misfire?
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I have a 98 plymouth voyager. It is a 3.0l v-6, coding 43 also. The code also makes reference to not being able to acheive maximum dwell. So I replaced the coil with a junk part. As well as cap rotor wires and plugs. All no help. Reset the pcm started coding about 6 days later. So i took it in. My mechanic also recommends checking fuel injectors. However didnt test them that day.
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toddmrfixit
Dodge Dakota
JOIN HERE
4/11/2003
23:28:56
| RE: what causes cylinder misfire?
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the info you are getting about setting timing is false.there is no way to set the timing.on these newer models the computer controls all the timing.when you turn the distributor you are setting the fuel sync and to get the proper full sync you have to hook up a scanner and go to the fuel sync set up mode. then you adjust the distributor to 0` when you turn it, it will switch from a + side of the scale to a - side . you want it to be at dead 0`. usually after about 80,000 miles it only comes out of sycn about 2-3` still this does'nt affect performance enough to set codes but will cause fuel economy losses.if the injectors are sometimes not working most likely their dirty with a good bottle of injector cleaner with a full tank of premium should do the trick . alot cheaper than the dealer.mine did this about 10,000 miles ago, and and a bottle of stp injector cleaner did it right. now i have a way better idle than i've had in years,no more codes either. uhm, $6 or $900 you choose!
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Brian C
Dodge Dakota
JOIN HERE
4/12/2003
11:04:26
| RE: what causes cylinder misfire?
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If you need you timing reset go to a dealer... it oly takes about 20 min.... it cost me like $30 shop time
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KarlOBrian
Dodge Dakota
JOIN HERE
4/12/2003
14:31:31
| RE: what causes cylinder misfire?
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The AutoLite 3923's will cause misfires. It happened in my engine. The screw on nubs came loose. Chuck those plugs and get the propper extended tip plugs, preferably platinum as they last longer and work great in our engines.
I don't buy the fuel injector story. It sounds like an easy way for the dealer to get you in to charge you $500.00 for changing the spark plugs.
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Jason
Dodge Dakota
JOIN HERE
5/29/2003
23:11:19
| RE: what causes cylinder misfire?
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we've been having misfire in cylinder #1. We replaced some belts. After driving it about 30 miles the check engine light came back on. We replaced the spark plugs, shortly after the check engine lihgt came back on again. The mechanic has since replaced a fuel injector and the check engine light came back on again. They have checked some wiring...does anyone have any ideas on what's causing this?
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Josh
Dodge Dakota
JOIN HERE
5/29/2003
23:40:19
| RE: what causes cylinder misfire?
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clean your fuel injectors out fuel rail could be rusted...
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Jason
Dodge Dakota
JOIN HERE
5/30/2003
19:06:22
| RE: what causes cylinder misfire?
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Is it possible it could be an intake gasket...are these costly to replace? I've done some research which has indicated this could be the cause.
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Jason
Dodge Dakota
JOIN HERE
6/02/2003
20:28:14
| RE: what causes cylinder misfire?
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Well, we repalced the intake gasket and all is well. The check engine light has not come back on and the engine is running good so far.
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Matt
Dodge Dakota
JOIN HERE
10/16/2003
21:04:54
|  RE: what causes cylinder misfire?
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now, like they said check the obvious, but lemme list all possiblities, firstly, it might be the injectors....but:
1) spark plugs and wires
2) bad piston rings- youd be able to tell if you have high oil consumption
3) ignition coil packs
4) THE COMPUTER-thats right, if many cylinders misfire, you should check that computer module that the ignition coil packs sit on. IT is a big possibility and is a recipe for disaster if it gets really bad. I would have that comp. checked out first.
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PeeDee
Dodge Dakota
JOIN HERE
10/19/2003
06:24:37
| RE: what causes cylinder misfire?
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Message:
I have an 02 quad with 4.7. After about 9000 miles one of my injectors clogged with rust and the light came on. Performance was not -noticably- affected at first, but got worse in the day and a half it took to get to the dealer. Mine was the # 3.
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