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  #1  
Old 05-21-2011, 08:03 PM
mfre1111 mfre1111 is offline
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Default 98 2.5 missing and then it doesn't

Hi, I have a 98 ranger with the 2.5 double spark plug engine. It will run fine sometimes and then all the sudden it will start missing and I get codes for #3 and 4 random missfire. Then it will just start running fine again. I have installed new plugs and new wires and it has a new timing belt as well. I have checked for vacume leaks and can't find any. It is the strangest thing. The only codes are the missfire ones and the system check incomplete which always comes up after clearing the codes. Any suggestions would be greatly appriciated. I have been turning wrenches for a long time and have never seen anything like it. I have done the wiggle test on the wires and everything I can think of. Please help.
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Old 05-21-2011, 08:06 PM
terryduanemiller terryduanemiller is offline
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Default Re: 98 2.5 missing and then it doesn't

vacuum leak?, 2.3/2.5 are commonly known for EGR failure
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Old 05-22-2011, 12:23 AM
knightmare1015 knightmare1015 is offline
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Default Re: 98 2.5 missing and then it doesn't

Quote:
Originally Posted by mfre1111 View Post
Hi, I have a 98 ranger with the 2.5 double spark plug engine. It will run fine sometimes and then all the sudden it will start missing and I get codes for #3 and 4 random missfire. Then it will just start running fine again. I have installed new plugs and new wires and it has a new timing belt as well. I have checked for vacume leaks and can't find any. It is the strangest thing. The only codes are the missfire ones and the system check incomplete which always comes up after clearing the codes. Any suggestions would be greatly appriciated. I have been turning wrenches for a long time and have never seen anything like it. I have done the wiggle test on the wires and everything I can think of. Please help.
It sounds like the EGR valve might be getting ready to fail. They'll start out as a misfire then it will get worse. Who ever invented the EGR crap ought to be shot right in the ass, cause that's where that person's head is at when they came up with that shit. You'll know for sure when it does fail. Check your vacum out to know for sure, plus you may have used th wrong plugs and wires too. 1998 and up usually, but not always calls for the expensive Iridium spark plugs.
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Last edited by knightmare1015; 05-22-2011 at 12:26 AM.
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Old 05-28-2011, 09:14 AM
Rangerlove Rangerlove is offline
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Default Re: 98 2.5 missing and then it doesn't

If the EGR thing doesn't pan out (indeed, those are nothing but a headache, and you can get plates to cover up where they went), you could test the ICM (ignition control module— when those go stupid they cause all kinds of problems and after a couple of decades they just go...happened in my Fairmont Futura awhile back), you could also test the coil packs. They aren't infallible and intermittent spark should be traced back there logically.

FOR EXAMPLE: If on a distributor system, a plug isn't firing or has intermittent spark, you test the plug, test the wire, then the distributor cap, then the rotor, then the points or hallway effect switch and then the flyweights. The condensor should be looked at, too.

So why wouldn't you trace ignition problems back to the coil pack?
I'd go plugs, wires, coil packs, ICM...check all electrical connections, grease up with non-corrosive afterwords, etc.

I've have more than one coil pack go stupid on me over the years. Just my two cents, and it's suffering from inflation. :P
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  #5  
Old 06-08-2011, 08:16 PM
joeaguilar joeaguilar is offline
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Default Re: 98 2.5 missing and then it doesn't

I had the same problem, truck would run fine then miss bad... Changed plugs, wires and coil packs, turns out it was the crank sensor, it was broken all the way around. Since changing the sensor truck has ran smooth. Then again mine a 97 2.3L. Good luck finding the problem

Last edited by joeaguilar; 06-08-2011 at 08:20 PM.
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