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  #16  
Old 07-14-2013, 05:50 PM
The tool man.
 
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Default Re: Cylinder 4 Misfire

40 psi is low for a 98 2.5. You could have a stuck injector, clogged fuel filter, or faulty regulator or weak fuel pump.

Get a stethiscope or use a piece of rubber tubing and listen to each injector. A malfunctioning injector will sound different from the good ones. Change the fuel filter since its cheap to replace. You will need an A.C. Disconnect tool to change it and can find that at any autoparts store.
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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; 07-14-2013 at 07:05 PM.
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  #17  
Old 07-15-2013, 10:35 AM
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Default Re: Cylinder 4 Misfire

Fuel pressure is to low. Change the fuel filter. If the pressure stays the same you need a new pump.
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2004 Ext Cab, 4WD, 4.0, Auto, 137k. (4.0 engine is out of a 2009 Ranger w/87k)

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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  #18  
Old 07-15-2013, 05:14 PM
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Default Re: Cylinder 4 Misfire

Ok so changed filter and same results. ..I guess I'll change pump next.
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  #19  
Old 07-17-2013, 07:33 PM
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Default Re: Cylinder 4 Misfire

New bosch pump installed with no improvements.
I also swapped injector 4 with 1 so let's see if it throws cylinder 1 misfire now.
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  #20  
Old 07-17-2013, 08:05 PM
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Default Re: Cylinder 4 Misfire

Quote:
Originally Posted by seyasegura View Post
New bosch pump installed with no improvements.
I also swapped injector 4 with 1 so let's see if it throws cylinder 1 misfire now.
Did you replaced the entire sending unit or just the pump?
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2004 Ext Cab, 4WD, 4.0, Auto, 137k. (4.0 engine is out of a 2009 Ranger w/87k)

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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  #21  
Old 07-17-2013, 08:16 PM
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Default

it's not the fuel pump

Fuel pumps do 1 of 2 things
They work or they don't

sent from my iPhone 5....PSH!!! I don't have money for a iPhone 5
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95 Ranger XLT 4x2 2.3 I4 5 speed 206,000 *dead*
96 Ranger XLT 4x4 4.0 V6 5 speed 173,000 *alive*
D35 front, 8.8 rear, 3.73 gears, limited slip rear diff

Last edited by 96_4x4_XLT; 07-17-2013 at 08:19 PM.
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  #22  
Old 07-17-2013, 08:24 PM
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Default Re: Cylinder 4 Misfire

Quote:
Originally Posted by 96_4x4_XLT View Post
guys it's not the fuel pump

Fuel pumps do 1 of 2 things
They work or they don't

sent from my iPhone 5....PSH!!! I don't have money for a iPhone 5
Where did you come up with that dumb idea? You are wrong.

----------

Quote:
Originally Posted by 96_4x4_XLT View Post
it's not the fuel pump

Fuel pumps do 1 of 2 things
They work or they don't

sent from my iPhone 5....PSH!!! I don't have money for a iPhone 5
The guy has KOER FP of 36 psi. That is a problem. Maybe he has a kinked line, all I know is the truck will not run right at 36 psi
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2004 Ext Cab, 4WD, 4.0, Auto, 137k. (4.0 engine is out of a 2009 Ranger w/87k)

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; 07-17-2013 at 08:29 PM.
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  #23  
Old 07-17-2013, 08:29 PM
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Quote:
Originally Posted by modelageek View Post

Where did you come up with that dumb idea? You are wrong.

----------

The guy has KOER FP of 36 psi. That is a problem.
dealing with fuel issues on 2 rangers thank you

sent from my iPhone 5....PSH!!! I don't have money for a iPhone 5
__________________
95 Ranger XLT 4x2 2.3 I4 5 speed 206,000 *dead*
96 Ranger XLT 4x4 4.0 V6 5 speed 173,000 *alive*
D35 front, 8.8 rear, 3.73 gears, limited slip rear diff
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  #24  
Old 07-17-2013, 09:13 PM
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Default Re: Cylinder 4 Misfire

I just replaced the fuel pump, when I swapped the injectors I took a look at the spark plugs intake side and they where all black (rich) I also swapped coils I did noticed a better response with the fuel pump and coil swap but miss is still there. I forgot to mention I got no cats and no o2 sensor. I'm waiting for misfire code to come up on scanner to see if hopefully it tells me cylinder 1 is misfiring. Guess I need to drive it longer.
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  #25  
Old 07-17-2013, 09:14 PM
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Quote:
Originally Posted by seyasegura View Post
I just replaced the fuel pump, when I swapped the injectors I took a look at the spark plugs intake side and they where all black (rich) I also swapped coils I did noticed a better response with the fuel pump and coil swap but miss is still there. I forgot to mention I got no cats and no o2 sensor. I'm waiting for misfire code to come up on scanner to see if hopefully it tells me cylinder 1 is misfiring. Guess I need to drive it longer.
No cats and o2 sensors is the issue

sent from my iPhone 5....PSH!!! I don't have money for a iPhone 5
__________________
95 Ranger XLT 4x2 2.3 I4 5 speed 206,000 *dead*
96 Ranger XLT 4x4 4.0 V6 5 speed 173,000 *alive*
D35 front, 8.8 rear, 3.73 gears, limited slip rear diff
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  #26  
Old 07-17-2013, 09:21 PM
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Default

Could it be the injector?

1993 Ford Ranger STX 4x4 4.0L 5spd manual
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  #27  
Old 07-17-2013, 09:28 PM
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Default Re: Cylinder 4 Misfire

Quote:
Originally Posted by 96_4x4_XLT View Post
No cats and o2 sensors is the issue

sent from my iPhone 5....PSH!!! I don't have money for a iPhone 5
While I wait for the CEL to give me confirmation, could I get away here in California with one CAT or do I need to install 2 for smog purposes?
My ranger does come with 2 cats right?
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  #28  
Old 07-17-2013, 09:31 PM
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Quote:
Originally Posted by seyasegura View Post

While I wait for the CEL to give me confirmation, could I get away here in California with one CAT or do I need to install 2 for smog purposes?
My ranger does come with 2 cats right?
the engine uses those o2 sensors not only for emissions but for performance and fuel economy
but there back in
proly 2 for Cali

sent from my iPhone 5....PSH!!! I don't have money for a iPhone 5
__________________
95 Ranger XLT 4x2 2.3 I4 5 speed 206,000 *dead*
96 Ranger XLT 4x4 4.0 V6 5 speed 173,000 *alive*
D35 front, 8.8 rear, 3.73 gears, limited slip rear diff
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  #29  
Old 07-17-2013, 09:52 PM
The tool man.
 
Join Date: Nov 2012
Posts: 1,679
Default Re: Cylinder 4 Misfire

Quote:
Originally Posted by seyasegura View Post
New bosch pump installed with no improvements.
I also swapped injector 4 with 1 so let's see if it throws cylinder 1 misfire now.
I suggested a simple test to tell if you had a bad injector. Did
do the test.

Quote:
Originally Posted by modelageek View Post
Did you replaced the entire sending unit or just the pump?
If you did'nt you still have the old regulator plus rubber lines on the sending unit which may be bad. Did you recheck the fuel pressure.

----------

Quote:
Originally Posted by seyasegura View Post
While I wait for the CEL to give me confirmation, could I get away here in California with one CAT or do I need to install 2 for smog purposes?
My ranger does come with 2 cats right?
You need both here. Are both o2 sensors missing.
__________________
Speed is just a question of money,so how fast do you wanna go.
1998 ford ranger splash.
2.5 liter 4cyl with a thrush muffler.5 speed manual.

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
Reply With Quote
  #30  
Old 07-18-2013, 08:40 AM
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Join Date: Jan 2009
Posts: 5,532
Default Re: Cylinder 4 Misfire

Quote:
Originally Posted by seyasegura View Post
I forgot to mention I got no cats and no o2 sensor.
Mrs. Lincoln how did you like the play?
__________________
2004 Ext Cab, 4WD, 4.0, Auto, 137k. (4.0 engine is out of a 2009 Ranger w/87k)

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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