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  #1  
Old 01-28-2011, 12:47 PM
Gum85 Gum85 is offline
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Unhappy Cylinder misfire help

My 97 2.3 4 cylinder Ranger's CEL came on the other day so I took it to Autozone and they scanned it and it turned out to be a #3 cylinder misfire code. I went ahead and changed the plugs (the old ones looked horrible when I removed them) and I ran some sea foam through the gas to try and clean the fuel injectors but the CEL light is still on. The guy at Autozone told me that once the misfire is corrected the CEL light would go off by itself without having to erase the code. Does anyone know if this is true? I'm thinking about replacing the plug wires and ignition coils but I'd hate to replace them and it turn out that the old ones are fine. What else do you think might cause a misfire code?

I just noticed today while driving that when I'm at a stop light with the truck just idling the CEL starts flashing but when I start to drive again and the truck gets up to speed it stops flashing but still remains on. I'm guessing this means that the misfire is worse at idle. Thought that info might help narrow the problem down.

Last edited by Gum85; 01-28-2011 at 05:59 PM.
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  #2  
Old 01-28-2011, 12:50 PM
naturecakezzz naturecakezzz is offline
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Default Re: Cylinder misfire help

It will turn off might take some driving but over time it will
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  #3  
Old 01-28-2011, 12:51 PM
pooleo pooleo is offline
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Default Re: Cylinder misfire help

i think you have to always erase the codes, try disconnecting the battery for awhile
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Old 01-29-2011, 10:52 AM
modelageek modelageek is offline
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Default Re: Cylinder misfire help

erase the codes, be careful driving with the flashing CEL. you can trash your CAT. always seafoam before you chnage plugs. test the wire or Swap a wire from another cylinder to test it. You also can test the coils with multimeter. I like Techron as an injector cleaner. I believe you also have an igniton control module so that could be the issue also......
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2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
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  #5  
Old 01-29-2011, 02:31 PM
Gum85 Gum85 is offline
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Default Re: Cylinder misfire help

I had an extra set of plug wires that I know for sure are good so I went ahead and changed the #3 cylinder wires. I tested the coils with my digital multimeter. Primary coil resistance was 1.0 Ohms which is within specs and the secondary coil resistance measured 14,900 Ohms which is a little higher than what the specs are but all of the coils read the same so I'm guessing the coils are fine. I'm gonna go ahead and remove the fuel injector from the #3 cylinder and replace it to see if that helps.
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  #6  
Old 01-29-2011, 02:39 PM
modelageek modelageek is offline
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Default Re: Cylinder misfire help

Quote:
Originally Posted by Gum85 View Post
I had an extra set of plug wires that I know for sure are good so I went ahead and changed the #3 cylinder wires. I tested the coils with my digital multimeter. Primary coil resistance was 1.0 Ohms which is within specs and the secondary coil resistance measured 14,900 Ohms which is a little higher than what the specs are but all of the coils read the same so I'm guessing the coils are fine. I'm gonna go ahead and remove the fuel injector from the #3 cylinder and replace it to see if that helps.
it sounds like you know what you are doing....if the injector does not do the trick, you might want to start looking at testing the ICM, and if that isn't it then maybe a compression test on that cylinder at a minimum.
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2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).
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  #7  
Old 01-30-2011, 09:45 PM
Gum85 Gum85 is offline
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Default Re: Cylinder misfire help

So here's the deal now. I replaced the fuel injector on the #3 cylinder and reset the CEL. Drove approximately 55 miles and the CEL came back on. I haven't scanned the code yet so I'm not sure if it's the same code I got the first time it came on. I looked into testing the ICM like you said but my Haynes manual say's that my model of Ranger's ICM is built into the PCM computer so I'm not real sure how to test it or even if I can. This is starting to baffle me I can't seem to pin point the problem here. Could my truck's PCM be throwing out bad codes. The truck seems to run great when I reset the CEL and once the CEL come's back on that's when the truck seems like it's running worse but it still runs pretty good even with the CEL on ?!?
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  #8  
Old 01-30-2011, 11:58 PM
electrickid101 electrickid101 is offline
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Default Re: Cylinder misfire help

check for vacuum hoses cracked or broken especially on the intake manifold runner control

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my 4 cyl ranger had this problem and it was a broken vacuum tube under the intake
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  #9  
Old 01-31-2011, 11:18 AM
Gum85 Gum85 is offline
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Default Re: Cylinder misfire help

I've got an update on the situation for you. I just got back from getting the truck scanned for codes and this time I got codes for a #1 and #3 cylinder misfire. Before it was just a #3 cylinder misfire so the problem seems to be getting worse.
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  #10  
Old 01-31-2011, 11:23 AM
90fordranger 90fordranger is offline
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Default Re: Cylinder misfire help

any one heard of hot wires? i over heard my friend talking about them, there spark plug wires. But there called hot wires. they add better performance and horsepower i guess. kinda off topic. but if its true it makes ur truck run better maybe you or someone would know.

My old truck started miss firing because it had literally no oil in it. Then well like most trucks with no oil they die.
possibly check your oil.
someone at school pulled my oil plug, and i got screwed over.
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Last edited by 90fordranger; 01-31-2011 at 11:25 AM.
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  #11  
Old 01-31-2011, 11:30 AM
modelageek modelageek is offline
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Default Re: Cylinder misfire help

Quote:
Originally Posted by Gum85 View Post
I've got an update on the situation for you. I just got back from getting the truck scanned for codes and this time I got codes for a #1 and #3 cylinder misfire. Before it was just a #3 cylinder misfire so the problem seems to be getting worse.
it doesn't mean it is getting worse it just mean you probably have a different problem. I would suspect a fuel issue. change the fuel filter and then do a fuel pressure tests

* also pull the vacuum line off of the fuel pressure regulator and make sure there is no gas in it!

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checking for oil is a good idea, but I am assuming you checked the oil checked the air filter and air intake, cleaned the maf, IACV and TB. as maintanence
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2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).

Last edited by modelageek; 01-31-2011 at 11:27 AM. Reason: *
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  #12  
Old 01-31-2011, 11:41 AM
Gum85 Gum85 is offline
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Default Re: Cylinder misfire help

I replaced the fuel filter about a month ago so I'm pretty sure that it's fine and I replaced the air filter around the same time. I didn't know that low oil could cause a cylinder misfire. I just ran outside to check the oil and the oil level was super low. I added 2 quarts and the dip stick is still reading a little low on oil. It looks like oil has been leaking out around the oil filter. Do you think this could be the problem for a cylinder misfire?
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  #13  
Old 01-31-2011, 11:46 AM
modelageek modelageek is offline
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Default Re: Cylinder misfire help

Quote:
Originally Posted by Gum85 View Post
I replaced the fuel filter about a month ago so I'm pretty sure that it's fine and I replaced the air filter around the same time. I didn't know that low oil could cause a cylinder misfire. I just ran outside to check the oil and the oil level was super low. I added 2 quarts and the dip stick is still reading a little low on oil. It looks like oil has been leaking out around the oil filter. Do you think this could be the problem for a cylinder misfire?
i quess it is possible especially in the cold weather......however i would plan on doing fuel pressure tests. They only take 20 minutes!
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2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
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  #14  
Old 02-01-2011, 06:39 AM
1KOOL1 1KOOL1 is offline
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Cool Re: Cylinder misfire help

Coil-pak. Both cyl. 1 & 3 are bad thru the coil-pak.
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Last edited by 1KOOL1; 02-01-2011 at 06:43 AM.
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  #15  
Old 02-01-2011, 06:49 AM
modelageek modelageek is offline
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Default Re: Cylinder misfire help

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Originally Posted by 1KOOL1 View Post
Coil-pak. Both cyl. 1 & 3 are bad thru the coil-pak.
it's possible that it is the coilpack but it would be very coincidental......I think it is something else, probably fuel....
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2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).
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