Major engine problems :-( - Ranger-Forums - The Ultimate Ford Ranger Resource


2.3L & 2.5L I4 Tech General discussion of 2.3L and 2.5L I4 Ford Ranger engines.

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Old 09-13-2009
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Icon9 Major engine problems :-(

check engine light: Miss fight on cylinder 1.
RPM's getting stuck.

Step one: Took throttle body off and cleaned the poop out of it. Was a dark deep black and now is a shinny sliver.
Step two: Changed all 8 Spark plugs & Wires.

After doing this, there is now a hesitation in the engine and the RPMs are little worse. Say the truck is at a stand still and just idling. When you get the truck past 15 mph the RPMs get stuck. When you push the clutch the RPMs coast up to about just over half throttle. They are now getting up stuck at about 15MPH or lower.

I really have no idea what's going on and I need to smog the darn thing this month. I don't have the money to take it to a shop but I can fix thing on my own just need to know what's going on.

Any bit of help would be worth millions, Thanks guys.
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Old 09-14-2009
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Idle problem sounds like an Idle Air Control valve - i'd try cleaning out the IAC and see if there are any improvements.
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Old 09-14-2009
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Idle problem sounds like an Idle Air Control valve - i'd try cleaning out the IAC and see if there are any improvements.
Would that be just for the RPMs or both problems?
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Old 09-14-2009
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What would it take to clean an IAC?
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Old 09-14-2009
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Same thing as your throttle body. Or you could use carb cleaner or any kind of engine degreaser. Your going to put the IAC back on when it's dry anyway so use what you have/want.
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Old 09-16-2009
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So I cleaned the IAC this morning and the problem is still there. Going to have to try and find a vacuum leek somewhere. Any tips on this?
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Old 09-16-2009
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So I cleaned the IAC this morning and the problem is still there. Going to have to try and find a vacuum leek somewhere. Any tips on this?
You can spray something... I think cab cleaner by your vaccuum lines while the engine is idling. If the rpms go up, the leak is in that area where you just sprayed the carb cleaner.

I'm not sure if carb cleaner is the correct thing to use, research that first before you attempt to try it.
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Old 09-16-2009
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I haven't done it yet. But would there be a chance of the RPMs dropping? If so what does that mean?
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Old 09-17-2009
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Step one: Took throttle body off and cleaned the poop out of it. Was a dark deep black and now is a shinny sliver

If IRC this may have been a mistake , There should be a black coating inside the bore applied at the factory.


And at 168K miles , have you changed the timing belt yet ?
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Old 09-17-2009
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I believe that was changed about 28k miles ago.
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Old 09-17-2009
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Hey can anyone show me where a TPS is located on a 2.5?
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Old 09-17-2009
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the TPS is located on the side of the throttle body, and never ever use carb clean on a IAC, it will get into the motor and eat the plastic and the coating on the windings
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Old 09-17-2009
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>.> well fart...wish I would have known that :-(
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Old 09-22-2009
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solved...Lose TPS plug >.>
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