1989 ranger 2.3l no power/poor milage (warm) - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 03-08-2013
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1989 ranger 2.3l no power/poor milage (warm)

1989 ranger, 2.3l, 5 speed, 4x4, no engine light on (it does work)


i think ive figured out my problem but i thought i would post what i have done to fix the issue for others.

about a week ago i noticed the truck would start hard, taking several cranking attempts before firing. i also noticed whenever i started the truck after it was warm, it would start easy but had no power at low RPM, i had to slip the clutch to take off in first and even then it barely got the truck rolling. as long as i was very generous with the throttle, i could accelerate through the rest of the gears fairly well, but whenever i let up on it it would backfire repeatedly til i pushed the clutch in or gassed it. i changed my fuel filter (which was quite dirty!) however it didnt fix the issue.

checked over wiring and checked spark plugs, didnt check them all but 4 of the 8 were decent, new wires last year, fuel regulator seems to be working. borrowed an OBD 1 tool and it threw two hard codes: intake air charge temp sensor out of range and engine coolant temp sensor out of range. thought about checking resistances but i think im just gunna spend the 45$ and get both and put em in

will update if it fixes, input welcome! im tired of driving this thing
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Old 04-30-2013
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nothing eh? well i managed to change my fuel pump/filter and fuel filler neck (was rusted out letting dirt in) however the problem still exists, just not nearly as bad
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Old 05-01-2013
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Have you tried cleaning your IAC (Idle Air Control), or does an '89 even have one?
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Old 05-02-2013
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replaced IAC and cootlant temp sensor.... currently will not drive, can (unreliably) get it to start and run, wont idle for long before it stalls
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Old 05-02-2013
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Sounds to me like you either have a major vacuum leak or compression loss.

I found this vacuum guide on autozone's web site:
| Repair Guides | Vacuum Diagrams | Vacuum Diagrams | AutoZone.com
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Old 05-02-2013
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i re typed my "story" or so it has become...

well i have been trying to snuff out the issue ive been having with my ranger for the last month or two. when the temp outside was <= 30 degrees it would start hard, often after 3-5 attempts, run "OK" (meaning it was lacking power, especially in the lower gears at lower RPM's and mostly at takeoff. however if i drove it a mile or two and shut it off and restarted it (i work a mile away) it would have no power, backfire and often wouldnt even build RPM in neutral with full throttle. i connected it to a code reader and i got faulty coolant temp sensor and intake air temperature sensor, which made it seem to run better for a day or two, but the problem reappeared.

next i wanted to test the fuel pressure but, the tester i had wouldnt fit because the EGR was in the way, so i took the upper intake and EGR off and replaced spark plugs, wires, upper intake gasket, cleaned throttle body thoroughly, replaced several vacuum hoses that were dry rotted, and my fuel pressure regulator, all stuff that should be done i guess. went back together, ran better but not great, same problem returned, but not right away.

then i noticed that my fuel filler tube neck had rusted off and dirt was getting into my fuel tank that way. i had changed fuel filter previously, and this time i dropped the tank and put a new fuel filler neck, new fuel pump and filter, made sure i cleaned the tank out good... started it up, ran ok, hints of hesitation but it started instantly which wasnt normal. drove ok for a couple days, took it 20 miles to the vet yesterday-45 minutes later and it wouldnt fire even once. waited another 30 for ride to get there, and i could get it to fire, but not run.

today i went and it started with several attempts (fuel pump sounds strong) idled for several seconds and died, couple times i could keep it running for a bit with the accelerator, but it died eventually each time, not enough power to move truck. tomorrow going to check fuel pressure again and use ohm meter on TPS.

ive looked at 15-20 posts on several forums, all describing similar symptoms, and few fixing the issue... i have considered crankshaft position sensor or maybe a coil pack (it was 30 degrees warmer than it has been yesterday). if the TPS and fuel pressure are good tomorrow i guess im going to do a cylinder leak test and go from there. any input would be greatly appreciated! thanks!
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