Engine loses power

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,877 POSTS
O man you are right I have seen the same thing. We address this issue in this guide.

https://www.2carpros.com/articles/engine-has-low-power-output

#1 thing to check

Use 2CarPros anytime, we are here to help. Please tell a friend.

Cheers, Ken

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Thursday, January 3rd, 2019 AT 10:04 AM (Merged)
Tiny
JEREMY CLEAVELAND
  • MEMBER
  • 1 POST
  • 1994 FORD RANGER
  • 4.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 228,000 MILES
I can drive it, but when taken off it stalls and then picks up and if on Highway or even going forty five mph it cuts out and I have to release gas and lightly give it gas again.
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Thursday, January 3rd, 2019 AT 10:04 AM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check fuel pressure with a gauge auto parts rent it.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
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Thursday, January 3rd, 2019 AT 10:04 AM (Merged)
Tiny
BRYANT TAYLOR
  • MEMBER
  • 2 POSTS
It's amazing that all the so called experts didn't even mention this and even charged me for their wrong advice. It took a non mechanic like me to fix my problem. Experts don't impress me.
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-1
Thursday, January 3rd, 2019 AT 10:04 AM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,877 POSTS
Nobody is perfect that's for sure we help people for free so you cant go wrong there.
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Thursday, January 3rd, 2019 AT 10:04 AM (Merged)
Tiny
RDS123
  • MEMBER
  • 1 POST
  • 1994 FORD RANGER
  • 125,000 MILES
Driving along at any speed my 4.0L. Truck will quite often shut off but crank back up while rolling when accelerator is released only to shut off again each time the accelerator is pressed. After several tries it will usually startand only run up to 50mph max [like its runing on 3 cylinders]then die back to idle. It will some time run like that for miles then it feels like the other 3 cylinders cut in and it runs great.I have replaced plugs, plug wires, pvc, Icm, fuel pump, filter, tps and mass air flow sensor.
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Thursday, January 3rd, 2019 AT 10:04 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,164 POSTS
Have you checked the crank sensor? Has the check engine light come on? Is the fuel pressure witin spec? Did you check the fuel pressure regulator?
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Thursday, January 3rd, 2019 AT 10:04 AM (Merged)
Tiny
TATTOOFORD
  • MEMBER
  • 1 POST
  • 1994 FORD RANGER
  • 80 MILES
I have a 94 Ford Ranger xlt 4.0 v6 auto. When ever I take off it acts sluggish and I have to floor it to take off. What are some of the main problems that might help me it's not the catalytic converters
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Thursday, January 3rd, 2019 AT 10:04 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,164 POSTS
It could be many things. Check for tune up, check fuel pump pressure, check for vacuum leaks.
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Thursday, January 3rd, 2019 AT 10:04 AM (Merged)
Tiny
CASEYBOB
  • MEMBER
  • 1 POST
  • 1994 FORD RANGER
  • 126,902 MILES
It started losing power then it started flooding its self out. So I changed the intake gaskets and the mad sensor and core. It still won't run unless I unhook the mad. What else could be the problem
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Thursday, January 3rd, 2019 AT 10:04 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Map sensor? What did you disconnect? The vacuum or electric?

Roy
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Thursday, January 3rd, 2019 AT 10:04 AM (Merged)
Tiny
ROBERT PALUMBO
  • MEMBER
  • 1 POST
  • 1994 FORD RANGER
Engine Performance problem
1994 Ford Ranger 6 cyl Two Wheel Drive Automatic 206K miles

1994 Ranger Splash 4.0 Auto 206K This truck I purchased new still runs and looks good. Lately however, I would startup vehicle and approx 5 seconds later it would go into a "rough" mode with poor idling/lack of power for about 1-2 minutes. In the afternoon when leaving work, I would be sitting at a stop light with brake on, and a small surge from the transmission would be felt, and then the truck would run normal again. Yes, there are alot of miles on vehicle but I'm not so sure it's time for a total rebuild. Any solid advise would greatly be appreciated.
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Thursday, January 3rd, 2019 AT 10:04 AM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Try testing the engine coolant temperature sensor to include a fuel pressure check-
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Thursday, January 3rd, 2019 AT 10:04 AM (Merged)
Tiny
KNOCK5
  • MEMBER
  • 1 POST
  • 1994 FORD RANGER
Engine Performance problem
1994 Ford Ranger 6 cyl Two Wheel Drive Manual 155 k miles

The vehicle has no problems running its driving. As you reach the speed from 20-25mph the truck starts to sputter and also at the speed of 55mph. The truck will not accelerate, then starts to decelerate at that point with a stutter affect also. What could be the problem in this case?
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Thursday, January 3rd, 2019 AT 10:05 AM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Lack of acceleration, chugging, hesitating, bogging etc. Could be caused by one of the following below.

Inspect and test all the following listed below and get back with some results

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
False air leakage.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard.
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Thursday, January 3rd, 2019 AT 10:05 AM (Merged)
Tiny
JEFFMCG
  • MEMBER
  • 2 POSTS
  • 1994 FORD RANGER
  • 4 CYL
  • 2WD
  • MANUAL
  • 165,000 MILES
My 94 Ford ranger has an intermittent Ignition problem, runs very rough, very low power, top speed maybe 50 in 3rd gear wide open. Had a garage look at it and they replaced the coils, wires and plugs, ran fine for a day, then problem returns, stops, returns.
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Thursday, January 3rd, 2019 AT 10:05 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,164 POSTS
Did they check fuel pump pressure? Also, did they check the crank sensor?
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Thursday, January 3rd, 2019 AT 10:05 AM (Merged)
Tiny
JEFFMCG
  • MEMBER
  • 2 POSTS
Ended up taking to another garage, and yes they performed those tests, it ended up being the Ignition control module
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Thursday, January 3rd, 2019 AT 10:05 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,164 POSTS
I'm glad you got it fixed. If it was a GM, that would have been the first thing to check. They usually don't go bad on Fords.

Let us know if you have questions in the future.

Joe
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Thursday, January 3rd, 2019 AT 10:05 AM (Merged)
Tiny
AZNCRAIG
  • MEMBER
  • 3 POSTS
  • 1994 FORD RANGER
  • 189,000 MILES
4.0L V6 4x4 Manual | The truck, when I'm accelerating, will lose power at mid-throttle, and does not pick up unless I floor it (then it's at full throttle, so very much an "on/off" switch). Sometimes it restores it to normal functionality, cruising at speed with my foot approx. Halfway down (until I shift again), but sometimes the power loss remains evident. It occasionally "bucks" when trying to accelerate as well. I tried unplugging the MAF and it resulted in no change, although it did stall with the MAF unplugged a couple times during my trip around the block. I know the clutch is a little worn and does need to be replaced, but it can't be the cause of the issue in my opinion. The mechanic I talked to thinks otherwise, but the fact remains that the truck operates perfectly fine at times. It seems like it has less issues when it is cold. Any help? I am way confused!

P.S. Likely unrelated, but it also tends to shift hard into first when warmer.
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Thursday, January 3rd, 2019 AT 10:05 AM (Merged)

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