Question about 1988 Ford Ranger

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When accelerating my 1988 2.3 Ford Ranger will intermittently mis

I replaced the 02 sensor,fuel filter,throttle control sensor,new spark plugs,
plug wires,ignition coil, dist. cap & rotor,tried another computer,another distributor, water sensor (gauge & intake water sensor), checked the thermostat (opens at 192-195 degrees and closed fully at 175-180. I replaced the timing belt & timed it at 10 TBDC. The fuel vol-psi was ck'd & showed good. I pulled apart all the wiring connector - checked all the grounds - cleaned and greased them. The comp. is within 5 #'s in ea. cly.
This all started after I had a mechanic replace the burnt out manifold exhaust flange 10k miles ago. The exh studs had to be replaced. He put in a junk yard o2 sensor ---so thats where I started--(its a long story). The caty. converter is also good. It starts good.idles good starts out good but it just misses intrermittently accelerating-even pulling into a wind will cause it to miss

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  • ecook Jan 11, 2009

    Appreciate you getting back to me. the comp on #1=112,#2=111,#3=110,#4=115. The plugs all have a lite gray look.
    Could there be a fuel metering intermittency ? And how could that be ck'd? Also when I replaced the valve cover gasket I ck'd the valve springs and they all seem to have the same spring tension.



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Got me thinking this one??done a compression test ???valve seats i think as cars before 92 didnt require a cat,if engine was designed without stelite coatings on the seats as it ran on leaded fuel.but with the introduction of unleaded fuels some cars sort of got missed in the changeover.but this is a ford and i know that when i worked in the factory in 1972 evan then all engines produced had stelite coatings but that was europeon built engines.Well enough history do a compression test,and if need be grind the valves in and fit new springs and seals it cant hurt

Posted on Jan 10, 2009


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Is there an engine light on? What condition are the spark plugs in? After 8 minutes, the engine is most likely up to operating temperature, therefor would be in closed loop, getting info from the o2 sensors and air temp, coolant temp sensors. One of these sensors could be causing an issue. Also, have you tried to spray out the throttle body with an intake cleaner to remove build up? How many miles are on your Ranger?

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