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

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Old 06-21-2010
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Problem with idle

Ok, so I started my truck up yesterday and it idled but it would fluctuate from a regular idle to a very low idle numerous times before it finally died. It does this everytime I start it up. I changed the fuel filter today and it still does the same thing. Any help?
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Old 06-21-2010
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1998 Ranger 2.5L 4 cyl. Standard
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Old 08-09-2010
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i have the same problem but mines a 1993 v6 4.0
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Old 08-09-2010
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Most common problem is the IAC valve.
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Old 08-09-2010
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ill look into that thanks... just to clarify.. my idling issue is while in drive (auto) and only happens sometimes... i've changed both O2 sensors, MAF... check engine light still on as well..
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Old 08-09-2010
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check the idle air controller

you could also have a charging issue
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Old 08-09-2010
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what do you mean charging issue ? can you explain a little more thanks...just enough so i can maybe google it..
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Old 08-09-2010
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your alternator might be failing

it is probably producing just enough voltage at idle when in neutral

but put it in drive , you are putting a load on the engine ,, that the spark plugs are barely firing

Last edited by cheese_man; 08-09-2010 at 06:42 PM.
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Old 08-09-2010
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When it running weird, take a hammer and tap on the iac. If it is the iac i should smooth out.
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Old 08-10-2010
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I ended up replacing the DPFE Sensor, the fuel filter, the manifold air intake sensor, and another sensor right beside the DPFE sensor that looks like a small cylinder or canister. It fixed the problem. Hope that helps.

However, the DPFE Sensor and the fuel fitler were not the problem but it never hurts to check them out. A mechanic actually had to plug up his machine and find out that the other two were the problem.
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Old 08-10-2010
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cheese man, wouldn't the codes show if the altnerator was failing ?
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Old 08-10-2010
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thanks rfen... i'll look into that...
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Old 08-10-2010
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not nesessarliy ,, the computer only monitors the charge output

if the alternator was putting out a lower charge rate that what was programmed to monitor

then the computer will illuminate the battery light in the dash

any automotive shop can hook up a charge monitor to it while the engine is running

then they do a load test
lights/ high beams / turn signals / hazards / fog lights / heater/ air conditioning / tranny in drive ETC
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