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Why wont it go over 3000 RPM?

Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
Glad to hear you found and fixed the problem. Intermitten faults like that are hard to find.
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Saturday, August 31st, 2019 AT 10:22 AM (Merged)
Tiny
TCOPELAND
  • MEMBER
  • 3 POSTS
Yes they are, it only took me 6 hours of checking every single wire connection, I had to break down all the big connections and trace every single one. But the end justified the means.
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Saturday, August 31st, 2019 AT 10:22 AM (Merged)
Tiny
DWIGHTINFINITY
  • MEMBER
  • 1 POST
  • 1993 FORD RANGER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 149,000 MILES
Ford Ranger 1993, 6 cyl. 3.0FI, It starts right up, runs fine for awhile, then the gas pedal starts to bog while it loses power. I let go of the gas a little, and it drives okay til it starts to bog again. This progresses until it dies down to 5 mph. Or stalls. If I shut it off in neutral & turn it back on, I'll get full gas pedal til it starts to bog again. I replaced the fuel pump, fuel filter, TP sensor, but it hasn't helped. It feels as though it is starving for air somewhere. Could this be? If I step on the gas all the way when it starts to bog at mid throttle, it wants to cut out & there is a popping noise--- sounds likke it's coming from the pipe above the catylatic converter. Please help?
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Saturday, August 31st, 2019 AT 10:22 AM (Merged)
Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
Make sure you have enough fuel pressure check pressure using a gauges
check exhaust system for restriction
check for codes
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Saturday, August 31st, 2019 AT 10:22 AM (Merged)
Tiny
GAMEZ69
  • MEMBER
  • 3 POSTS
  • 1991 FORD RANGER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 172,000 MILES
My truck runs fine when 1st starting cold in am, as soon as it warms up NOT overheating it loses power and tries to turn off, it won't start till it cools off again?
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Saturday, August 31st, 2019 AT 10:22 AM (Merged)
Tiny
RENAUDTN
  • MECHANIC
  • 636 POSTS
Hello,
It sounds like as soon as your car goes from open loop (cold engine runs on pre-set fuel/air ratio) to closed loop (engine at normal temp runs on fuel/air ratio calculated based on sensors inputs) you start having problem. It makes me think that you could have a sensor problem. I'd start with the coolant sensor, the O2 sensor, MAP, MAF and IAT sensors.
Also, after your car quits running do you have a spark on all cylinders?
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Saturday, August 31st, 2019 AT 10:22 AM (Merged)
Tiny
DRAGONLOVER065
  • MEMBER
  • 2 POSTS
  • 1989 FORD RANGER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 93,000 MILES
The truck has had a tune up but loses power going up hills after it is warmed up. In addition, there are popping noises while laboring up the hill.
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Saturday, August 31st, 2019 AT 10:22 AM (Merged)
Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
Check your ignition timing and try a higher octane fuel.

If it does it when warm there may be a fault in your ignition system. Bad plug wires, plugs, igniiton control module, coil.
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Saturday, August 31st, 2019 AT 10:22 AM (Merged)
Tiny
NAILZ750
  • MEMBER
  • 1 POST
  • 1988 FORD RANGER
  • 4 CYL
  • 4WD
  • MANUAL
  • 151,000 MILES
I got an 88 ranger 2.3 straight shift. Starts and idles fine and runs strong for bout a mile then starts bogging down as I give it gas. I have change the following: plugs, wires, cap, button, electronics on side of distributer, distributer, injectors, both fuel filter, iac valve, throttle position sensor, pvc alve, and both fuel pumps. Please help I am out of ideas. And money
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Saturday, August 31st, 2019 AT 10:23 AM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Dirty fuel injectors (cleaning the injectors often fixes this).
Bad MAP (manifold absolute pressure) sensor
Bad TPS (throttle position) sensor
Bad or dirty MAF (mass airflow) sensor
Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
Bad gasoline (fuel contaminated with water or too much alcohol)

Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

Dirty or worn spark plugs
Bad plug wires
Weak ignition coil
Wet plug wires
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Saturday, August 31st, 2019 AT 10:23 AM (Merged)
Tiny
PRETECH1
  • MEMBER
  • 1 POST
  • 1988 FORD RANGER
Engine Performance problem
1988 Ford Ranger 6 cyl Two Wheel Drive Automatic

I have a 1988 Ford Ranger that runs fine until it gets hot. After hot it seems to run ok at highway speed, but at city speeds after reaching high gear it starts getting slower & slower. When you depress the throttle it jumps up in RPM's. I have replaced the TPM, coil, dist cap, wires, igntion module, MAP sensor, fuel filter, air plenum gasket with no luck. Any ideas?
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Saturday, August 31st, 2019 AT 10:23 AM (Merged)
Tiny
PEAR69
  • MECHANIC
  • 1,482 POSTS
Do a compression test and leak down test on all cylinders. You may have a failing head gasket. Is it an inline 6?
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Saturday, August 31st, 2019 AT 10:23 AM (Merged)
Tiny
PEAR69
  • MECHANIC
  • 1,482 POSTS
If it has a coolant temperature sensor, replace it.
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Saturday, August 31st, 2019 AT 10:23 AM (Merged)

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