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  #1  
Old 12-22-2012, 08:25 PM
minitruck99 minitruck99 is offline
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Default 2.5L rough idle, major skip

hello, about a month ago my ford ranger with a 2.5L 4 cyl started giving problems. Horrible gas mileage was the beginning. About 12mpg was normal for me. Is this normal for this engine? I've seen listings saying this motor is supposed to get about 25mpg which is what i was expecting. Anyway i was slowing down at a stop light and the truck wanted to stall out but instead idled very low about 300rpm. When i pressed the gas it smoothed out so i continued to head to the gas station to fuel up. Once i fueled up and went to start the truck again it started harder than usual and had no power what-so-ever. I ended up limping the truck to the nearest parking lot and left it there until the afternoon. I have replaced fuel injectors, plugs, wires, cleaned the iac, cleaned the maf, put dry gas in the tank in case it was water, tried coils off of a working ranger with the same motor and still no luck. if anyone has a clue what it may be please let me know because i am pretty much lost. it has 99,400 miles on it if that helps, thank you. youtube video of problems:
sorry about the book of a post.
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  #2  
Old 12-22-2012, 09:38 PM
stateranger stateranger is offline
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Default Re: 2.5L rough idle, major skip

It's normal for the engine to slow down when the oil cap is removed.
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Last edited by stateranger; 12-23-2012 at 12:29 AM.
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  #3  
Old 12-23-2012, 12:18 AM
minitruck99 minitruck99 is offline
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Default Re: 2.5L rough idle, major skip

there is no pinging when the throttle is pressed however it does almost "backfire" back through the intake when you hit the gas almost like a very loud bog but then itll rev up. once it revs it smooths a little but not much. and the fuel pressure came up to be 68 pounds and that is with a new fuel filter also. codes p0302 and p0303 came up for missfire on cylinders 2 and 3. i find it odd that its two cylinders next to eachother and its the only two coming up for missfire
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  #4  
Old 12-23-2012, 01:15 AM
stateranger stateranger is offline
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Default Re: 2.5L rough idle, major skip

I edited my earlier post because of what I heard on your video.It sounded like it was very continuous miss at idle.
Do a compression test.You could have a gasket leak between cylinder 2 and 3.

Spray wd40 were the upper and lower intake meet .If the idle changes replace the gasket.

Thanks for getting the codes.
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Originally Posted by pk9298 View Post
HELL TO THE NO!! Abort abort abort!! That's the first thing to go!!! Ewwwww! I'm not no vampire! I don't enjoy red tea

Last edited by stateranger; 12-23-2012 at 01:28 AM.
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  #5  
Old 12-23-2012, 04:44 AM
modelageek modelageek is offline
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Default Re: 2.5L rough idle, major skip

Quote:
Originally Posted by stateranger View Post
I edited my earlier post because of what I heard on your video.It sounded like it was very continuous miss at idle.
Do a compression test.You could have a gasket leak between cylinder 2 and 3.

Spray wd40 were the upper and lower intake meet .If the idle changes replace the gasket.

Thanks for getting the codes.
It has the all the symptoms of a bad coilpack. the one that feeds the passenger side most likely?...the other possibility is a blown HG between the 2 cylinders or a cracked head between the 2 cylinders.........you said you swapped the coil-packs with some from another truck?.........you should swap your 2 coilpacks and see if it gets better........you can test the coilpack with a $5 multimeter also......

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Quote:
Originally Posted by minitruck99 View Post
hello, about a month ago my ford ranger with a 2.5L 4 cyl started giving problems. Horrible gas mileage was the beginning. About 12mpg was normal for me. Is this normal for this engine? I've seen listings saying this motor is supposed to get about 25mpg which is what i was expecting. Anyway i was slowing down at a stop light and the truck wanted to stall out but instead idled very low about 300rpm. When i pressed the gas it smoothed out so i continued to head to the gas station to fuel up. Once i fueled up and went to start the truck again it started harder than usual and had no power what-so-ever. I ended up limping the truck to the nearest parking lot and left it there until the afternoon. I have replaced fuel injectors, plugs, wires, cleaned the iac, cleaned the maf, put dry gas in the tank in case it was water, tried coils off of a working ranger with the same motor and still no luck. if anyone has a clue what it may be please let me know because i am pretty much lost. it has 99,400 miles on it if that helps, thank you. youtube video of problems: http://www.youtube.com/watch?v=o1CzU4ahEDc sorry about the book of a post.
It has the all the symptoms of a bad coilpack. the one the feeds the passenger side most likely?...the other possibility is a blown HG between the 2 cylinders or a cracked head between the 2 cylinders.........you said you swapped the coil-packs with some from another truck?.........you should swap your 2 coilpacks and see if it gets better........you can test the coilpack with a $5 multimeter also......
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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; 12-23-2012 at 05:35 AM.
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  #6  
Old 12-23-2012, 05:01 AM
modelageek modelageek is offline
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I watched the video. The video is a good idea but I could barely hear you. The timing belt could have jumped but since all you have for codes us the 302 and 303 if is less likely. The backfire and the 2 codes point to the coilpack. Stick the leads of a mm into the sockets of #2 and #3 you should have about 13.5k ohms. Keep checking for codes
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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).
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  #7  
Old 12-23-2012, 03:55 PM
minitruck99 minitruck99 is offline
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Default Re: 2.5L rough idle, major skip

i am leaning toward the thought of the hg. i noticed also if you unplug the plug wire from either the plug or coil when it is running from cylinders 2-3 it makes no difference at all. i checked the tbelt for any skipped teeth but everything was lined up at top dead center and the belt was tight. the hg seems to be the only thing left i can think of. i will check the coils again and hopefully i will luck out and itll be coils. thank you guys for the help it is greatly appreciated.
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  #8  
Old 12-24-2012, 04:23 AM
modelageek modelageek is offline
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Quote:
Originally Posted by minitruck99 View Post
i am leaning toward the thought of the hg. i noticed also if you unplug the plug wire from either the plug or coil when it is running from cylinders 2-3 it makes no difference at all. i checked the tbelt for any skipped teeth but everything was lined up at top dead center and the belt was tight. the hg seems to be the only thing left i can think of. i will check the coils again and hopefully i will luck out and itll be coils. thank you guys for the help it is greatly appreciated.
Did you swap out both coilpacks from another 99 Ranger?

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sent from DROID Bionic using tapatalk-2. (Ranger, 1999, reg cab, 2.5, 5 speed, 2WD) (2006, Vibe, 1ZZ, Auto, AWD)
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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).
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  #9  
Old 12-24-2012, 10:09 AM
minitruck99 minitruck99 is offline
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Default Re: 2.5L rough idle, major skip

yes both coil packs were switched with another 99 ranger and still nothing changed
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  #10  
Old 12-24-2012, 10:21 AM
modelageek modelageek is offline
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Quote:
Originally Posted by minitruck99
yes both coil packs were switched with another 99 ranger and still nothing changed
I would swap them with each other and or test them with a MM

1999, Reg Cab, 2.5, 5 speed, 145k. (Sent from my DROID BIONIC using FRF App)

----------

Quote:
Originally Posted by minitruck99
yes both coil packs were switched with another 99 ranger and still nothing changed
If it was the HG I would think you would still have something. You have 2 dead cylinders. The coilpacks fire in pairs, at the same time, 1&4,2&3.

1999, Reg Cab, 2.5, 5 speed, 145k. (Sent from my DROID BIONIC using FRF App)
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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; 12-25-2012 at 08:48 AM.
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  #11  
Old 12-24-2012, 06:04 PM
stateranger stateranger is offline
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Red face Re: 2.5L rough idle, major skip

Quote:
Originally Posted by minitruck99 View Post
i am leaning toward the thought of the hg. i noticed also if you unplug the plug wire from either the plug or coil when it is running from cylinders 2-3 it makes no difference at all. i checked the tbelt for any skipped teeth but everything was lined up at top dead center and the belt was tight. the hg seems to be the only thing left i can think of. i will check the coils again and hopefully i will luck out and itll be coils. thank you guys for the help it is greatly appreciated.
Did you do the mm test.
If you want to see if its internal do a compression test.
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2014 F150 xl 3.7 6 speed auto.

Quote:
Originally Posted by pk9298 View Post
HELL TO THE NO!! Abort abort abort!! That's the first thing to go!!! Ewwwww! I'm not no vampire! I don't enjoy red tea
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  #12  
Old 12-25-2012, 08:10 AM
minitruck99 minitruck99 is offline
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Default Re: 2.5L rough idle, major skip

i am going to run a compression test and i know the coils fire in pairs like that even with new coils nothing changes. could it possibly be a cam or crank sensor not sending spark or fuel delivery at the right time?
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  #13  
Old 12-25-2012, 08:17 AM
94mtx 94mtx is offline
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Default Re: 2.5L rough idle, major skip

Jesus Christ dude, test your coil packs with a multimeter!


Quit avoiding the help because you think you know it's not something people are suggesting.


There is a possibility of a bad coil pack, bad wiring, or even something bad before the coil packs...

Quit chasing rabbits when you haven't even checked the basics.
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  #14  
Old 12-25-2012, 08:21 AM
bigfisher bigfisher is offline
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This is why I'm hesitant to help people on here anymore. They're too stupid to listen to advice

Sent from my iPhone 5 using FRF App
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  #15  
Old 12-25-2012, 08:51 AM
modelageek modelageek is offline
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Default Re: 2.5L rough idle, major skip

Quote:
Originally Posted by 94mtx View Post
Jesus Christ dude, test your coil packs with a multimeter!


Quit avoiding the help because you think you know it's not something people are suggesting.


There is a possibility of a bad coil pack, bad wiring, or even something bad before the coil packs...

Quit chasing rabbits when you haven't even checked the basics.
Quote:
Originally Posted by bigfisher View Post
This is why I'm hesitant to help people on here anymore. They're too stupid to listen to advice

Sent from my iPhone 5 using FRF App
seriously.......I am belly laughing real time......I have been watching the tread waiting for the OP to answer one question or try one easy test. ie. the coil swap or test them with a MM....I get the emails on my droid...if he had just tested the coilpacks with a $5 MM I would have responded days ago..........bigfisher......I agree with you.......I have slowly stopped helping new people too.........It is however comical!!!!!!!

----------

Quote:
Originally Posted by minitruck99 View Post
i am going to run a compression test and i know the coils fire in pairs like that even with new coils nothing changes. could it possibly be a cam or crank sensor not sending spark or fuel delivery at the right time?
it's not a cam or crank sensor.....it is isolated to 2 cylinders.....it is either, the coilpack, the ECU (ECU very rarely fail) or an internal engine issue......
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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; 12-25-2012 at 08:54 AM.
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