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

Idle issue

Old 12-18-2018
Thread Starter
Join Date: Dec 2018
Location: Charleston SC
Posts: 2
Idle issue

Hello guys/gals,

First post. I have a 2003 ford ranger that I bought about 2 years ago. It has the 2.3 in it. 120,000 miles. Has been running so good. When I first bought it I replaced spark plugs, plug wires, valve cover gasket, intake manifold, brakes & rotors, fuel filter, air filter (just replaced again), fuel pump. I think that's about it. Just recently it started acting strange at stop lights. It idles rough like it wants to die and the belt starts squeaking. Only does it for about 10 sec after stopping. Doesn't do it every time. I cleaned the IAC and MAF. Nothing seemed obviously messed up. Also it did it once when driving down the road. Any ideas? No codes.

Old 12-19-2018
RF Veteran
iTrader: (1)
Join Date: Jan 2014
Location: Vancouver, BC
Posts: 12,529
Welcome to the forum

At 120k miles the upstream O2 sensor should be replaced, downstream last 3 times as long, so 300k+
But thats not cause of described issue

Have the codes in computer memory checked, WRITE THEM DOWN!!!!

CEL(check engine light) doesn't come on for all codes
Any codes in memory could point you in the right direction

The fan belt squealing can just be because of the drop and increase at lower RPMs, so a symptom not a cause

Last edited by RonD; 12-19-2018 at 10:38 AM.
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