Engine loses power

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

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.

check fuel pressure with a gauge auto parts rent it.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

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.

Nobody is perfect that's for sure we help people for free so you cant go wrong there.

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.

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?

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

It could be many things. Check for tune up, check fuel pump pressure, check for vacuum leaks...

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

map sensor???? what did you disconnect??? the vacuum or electric??

Roy

Engine Performance problem
1994 Ford Ranger 6 cyl Two Wheel Drive Automatic 206K miles
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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.

Try testing the engine coolant temperature sensor to include a fuel pressure check-

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?

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.

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.

Did they check fuel pump pressure? Also, did they check the crank sensor?

Ended up taking to another garage, and yes they performed those tests, it ended up being the Ignition control module

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

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.

Check the TPS (throttle position sensor) It's an easy install and the sensor only runs about $25.
I had the same problem...racing idle, not going into gear. Replaced it and all the problems stopped, it even increased my milage.

Thanks for your reply. I replaced the fuel filter and it seems to have fixed it. However, with a truck that's almost 20 years old, I stand to benefit by inspecting and/or replacing a lot of small things. The TPS is a great recommendation. Should have thought about that before!

my 1994 ranger knocks when accellerating and lacks power. i changed fuel filter, ignition wires. any ideas what to do next?

Could be detonation -Check and test the knock sensor and the EGR valve if not detonation -check oil pressure could be engine bearings

Engine Performance problem
1991 Ford Ranger 6 cyl Two Wheel Drive Manual 100K+ miles

Strange problem. Started to experience a loss of power. Takes a long time to get the vehicle moving but will eventually get up to speed but any hill becomes a struggle. The engine runs fairly smooth, not like a plug wire is off but there is some slight popping or backfire noise when you let off the accelerator. I have done the obvious, new fuel filter, new plug wires, plugs are ok and maintains fuel pressure of 38 psi at the Schrader valve throughout the RPM range. There is a definite, loud clicking sound from the two aft injectors on the passenger side. I removed the connector at those two injectors and the clicking disappears without a noticable change in engine noise. I thought possibly injectors were plugged so I replaced all six. The new injectors did not improve the problem at all. When I put a meter to the connectors while running I get 12.85 volts. The other odd item is after the engine runs for a few minutes, the plug wires are very hot, too hot to touch. Any ideas?

resistance is what creates heat, maybe you do need new plugs. When you remove the 2 injector plugs , does the engine run different?

i installed new plugs and it runs slightly better or maybe it's just my imagination. The plug wires are still hot and it still has the loud tapping noise. When I disconnect the aft two passenger side injector connectors the noise goes away and engine runs only a little rougher, almost not noticable. I also pulled the valve cover and removed rocker arms. The valves stayed in place so at least a valve is not broken at a stem. If you push the gas it eventually gets up to about 4k rpm and seems to run smoother. I also usually have to hold the pedal to the floor to get it started if it does not start on the first try. Seems like it is flooding. Can the ignition coil cause the hot wires as well?

Possibly. do you have nice blue spark or is weak and orange? Good compression on all cylinders?

I do not have the ability to check compression, guess Ill have to go buy the tool. I am however thinking possibly bad valves I replaced the coil since it's only 20 bucks. The motor fired up easier but still have the noise. The odd thing is after running a few minutes and reving the motor, only the passenger side plug wires are hot, drivers side I can hold onto with no problem. The noise sounds like an exhaust leak but there isn't one. Motor is slow to respond when accellerator is pushed, response is not as immediate as it should be. I would say there is about a 2-3 second lag. Once it respnds it seems ok at high, (4K) rpm's. I am getting lost on whether it's a fuel issue cauing the electrical or visa versa. What are the chances it's the ICM? I don't think this is in anyway emmisiions related, it seems to be affecting only the two aft right hand cyliders. When it gets dark tonight I'll run it and look for any sparks were they shouldn't be. The dist cap is the only thing not new but the cap and rotor look brand new, no carbon, no signs of arcing.

A compression test will help figure this out.It could be a head gasket blown between those 2 cylinders

I have a 1990 ford ranger that experienced a loss of power. I have to have it right to the floor to go highway speeds. It's a 2.9L standard. The converter is not plugged. Fuel filter is good. What is my next step.

1. Fault in the fuel or electrical system.
2. Faulty or incorrect gapped spark plugs.
3. Fault coil.
4. Brakes binding.
5. Automatic transmission fluid level incorrect.
6. Fuel filter clogged and/or impurities in the fuel system.
7. Emission control system not funtioning properly.
8. Low or uneven cylinder compression pressure.
9. Faulty spark plug wires.

my 2.3l runs great sometimes but will all of a sudden go into a jerking,bucking,backfiring, gas guzzleing,vibrating,mash the pedal to maintain 45mph piece of crap. If it sits for a long period of time (overnight or longer) it will be ok for a short period of time (half a day). It does have a check engine light on but as I am rural no one around here has the equipment to download OBD1 trouble codes. I have new plugs and wires -thought it was a shorted plug wire. I have only owned it for around 3 thousand miles. this problem occured after filling the tank - when I went back to the station to ask if they had a bad load of fuel they were closed - for good!. I have since ran that bad fuel out but still have the problem. Maybe its part of it maybe not. Its like someone flipping a light switch- runs good- FLIP- runs bad. It also has a new fuel rail and pressure reg installed b4 I bought it.

u need to get that check engine light diagnosed before u spend any more money cause that could be where the problem lies

so after removing sparks plugs, I was told STEAM came out of #4 SPARK plug hole. What should be my next check/step?

are you loosing coolant? how was it determined to be steam and say not gas vapors form leaky injector?

did spark plug look different from other cylinders? like really clean or funny deposits?

good questions. I will have to check. Thanks!

nevadavic: What's the verdict on this? Was it steam or gas vapor? Is that plug cleaner than the rest?

All good Q's! But I already researched as U all suggested. No loss of coolant, and no the plug was similar color as others. turns out it was not steam was just hot gases. the problem was/is the transmission. the uphill issue matured into an acceleration issue but the tachometer did not fluctuate during acceleration! long story but the Xmission needs to be worked on. thanx for support!