Engine has a loss of power

Have you checked for codes in the computer and also had a back pressure test down when it acts up? It sounds like the MAF sensor is bad. This guide will help us fix it.

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

Please run down this guide and report back.

OBD reader at AutoZone prints out code P0420 and says it is catlytic converter problem possibly caused by engine misfire, large vacuum leak or excessive oil leakage into the exhaust. No recent repairs done. found no vacuum leaks and not burning oil. However I did add a bottle of injector cleaner with previous gas fill up and immediatly after the "Service Engine Soon" light came on. 1st trip on freway since then. Could injector cleaner damage oxy sensor or converter?

AutoZone OBD reader comes up with catalytic converter problem, possibly caused by engine misfire, large vacuum leak or excessive oil in exhaust. No engine misfire, now vacuum leaks found, not using oil. HOWEVER, I did add a bottle of injector cleaner a couple fills backs and the "Service Engine Soon" lite came on for a couple days. So a long story short I replaced the fuel pump which fixed it.

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My truck will drive fine for a couple of miles, but afterwards will lose some oil pressure (it will be around 80 for the first bit, then drop to under 40 until I give it gas), and it will lose engine power and accelerate slowly nag sluggishly in 1st and 2nd, then once it has some speed, it appears to operate somewhat normally. When I remove my foot from the gas, the oil pressure will drop again, but when I accelerate again, so long as I'm in 3rd or higher, will continue to operate normally again. It makes a strange sound when the pressure drops, like it's puttering when in low gear, and it emits a strange odor (I'm not sure how to describe the smell) when trying to accelerate.

The pressure ever drop below 10 psi? Could be your clutch is slipping a bit...

No, the psi just barely drops below 40, it just loses engine power.

Pressure is OK, does the engine seem to rev while the car goes slower? In other words, does it feel like the engine wont rev?

It revs, but it sort of sputters when it does so... It also picks up speed, but extremely slow, and even in higher gears, it continues to do so.

First step is a code scan Autozone does it free, also get the freeze frame data. This explains what the conditions where when the code set. Post all info here. Also you might want to check the catalytic converter(s). If the bed inside breaks up, pieces get lodged in the exhaust pipes and muffler, and will choke the engines breathing.
If you have a vacuum gauge, hook it up to an intake manifold port, raise the rpm to 2000, gauge should remain steady at 18hg or higher, if it starts to drop, the exhaust is plugged up.

I am experiencing problems with Acceleration Power Loss and up hills it losses power and surges. It is like I'm taking my foot off throttle.
I have run it with Fuel system cleaner, changed fuel filter, changed fuel pump, changed Cat Converter, Muffler and still having problems with no change. Sometimes it is worse than others.

I read somewhere that the timing chain and tensioner would cause this if worn. I have taken to Dealer and he said I need to run automatic transmission in gas to clean the fuel system. But no help.

I clamped off the vacuum line to the Fuel Regulator and it fixed the problem. Short of buying a new regulator and replacing it, I drove it a while with the vacuum line off so I think I will drive it a while like this to verify that It does not reoccur.

Hi,

I am having a problem that happened 2 months ago, then repaired it's self and now it is not repairing it's self. Once my truck warms up it stumbles and looses power. Especially going up hills or if I give it any gas. I can keep my foot just touching the accelerator and make it up the hills (barely) and then can make it down with gravity. I change the TPS but this did not help. Should I move on to the fuel pressure and Cat check? Or is there something else simple I should check?
Thanks,
-Dusty

i would change the plugs and wires first, and clean the MAF sensor with some qd contact cleaner and see how it runs. if that isnt any beter i would check the fuel pressure and the exhaust system for clogging. you can test it with a vaccum guage.

Why is my 1999 Chevy s10 2.2 not performing like it should when I replace the mass air filter and plugs and wire and fuel filter and air filter what can it be that makes it lack performance

2.2,Chevy s10 not getting the performance that it should have

you replaced the mass airflow SENSOR?is it missing?low power?

Yes I replaced the mass air sensor and its low on power

I would scan for codes. Check the convertor for backpressure[exhaust shop] check fuel pressure.

How can I check the fuel pressure, and what codes can I check

take your truck to your local parts store ask them to scan your truck they can get codes from the computer that are stored when a fault occurs. fuel pressure is done with a fuel pressure fuage you have a schrader valve on the fuel rail on the engine

I took it 2 the parts store and the said that the check engine light had 2 be on for them 2 scan it what do u think will make it hesitate when I give it gas and make it lose power beside the mass air and air filter and plugs and plug wire

well a weak fuel pump can cause this[need to check fuel pressure]
a bad throttle position sensor can cause it
a plugged exhaust system like convertor
bad o2 sensor it all depends on readings vacum should be min of 20 psi fuel pressure 35-40 compression 100-150 per cylinder
a bad ignition module can cause this also

I was driving my truck into town like any other day and on my way home the truck started bogging down, like it was pulling something heavy. I made sure the parking break was fully released, and checked the engine for any smoke, or leaking fluid, and made sure the oil was still full, or if the belt had broken. Finding nothing to be wrong, i shut the truck off and restarted it hoping the computer just needed to reset because of a sensor error, but the truck continued to bog down and get slower and slower until i got it to the drive way (luckely) and pushed it the rest of the way and parked it. i let the truck sit and check the oil once again to make sure i wasn't driving it with low or no oil and it was fine. but the truck still won't start. can you offer any help or suggestions?

Just bought the truck 3 months ago and already replaced all the plugs, wires, alternator, starter and fuel pump.

it has more running problems besides this one but... it currently doesn't run and that's what i need fixed first

Can you check for codes? Have you done any basic testing? Have a helper crank it while you check for spark at the plugs.

I know the pump was replaced, how about the fuel filter? Can you check fuel pressure? It sounds like a fuel issue.

the fuel filter is also new, and there is plenty of pressure in the line, i used the pressure release valve on the fuel line near the engine block to test for good pressure and to see if there was any blockage. i also already tested the plug wires with a spray bottle while it was turning over. every once in a while, while its turning over it does a real short sputter like its trying to start, but i havn't figured out the problem yet.

and i also don't have access to a code machine.

Did you visually check for spark at all the plugs? Did you use a fuel pressure gage, just seeing gas squirt is not conclusive.

My Chevy S-10 has no acceleration and limited power. About a week ago, my truck started losing power going up hills. These are grades on freeways, not off road. Now my truck hesitates/ jerks everytime I am accelerating or trying to maintain speed. When I press the gas, it accelerates, but with limited power. Additionally, when I get to 75 mph, I cannot accelerate any faster almost as if the engine doesn't have enough power to accelerate to a higher speed. I recently had the fuel pump replaced. I have also just replaced the fuel filter with no resolve.

your loosing compresion check your head gasket or any sighns of water in your oil?

Thank you, I will try to get a compression test done.

How did you resolve this problem? mine is doing the exact same thing. Already replaced same and the IAC and TPS as well.

I did a host of things to find out that it was a rather simple fix for me.

There is a tube / hose that goes from my air intake to the top of my engine block. While feeling around the engine for possible bad connections at my spark plugs, I bumped a this tube. For some reason the connection at the engine side had came loose. I pushed in back into place (felt like it snapped/ clicked back into place) and my power came back.

Prior to that I had:

removed my cat conv which assisted a little

I removed my air filter: this helped more than the cat conv. but can't drive around with out filter.

When I put them all back on, the same problem pesisted. Not sure if you use a knn filter, but if you do, you also may have over oiled the filter which could cause a build up on your mass air flow sensor. To clean that I was recommended to use choke/carb cleaner and canned air to remove the residue.

If this fixes your challenge, please let me know.

My S-10 (4.3 liter engine V-6) when it first starts up & try to take off the engine bogs down, won't hardly pull it's self out of it's tracks. After about 2 blocks it runs GEAR!!!! But if I shut it off for just a minute then try & drive it same thing it won't hardly run for about 2 blocks then after that it runs great. I've had it to 2 shops & they've run there diagnostic analyzers (A Snap-on & the other is a Altest? and these mechanic's are really good & both run a auto repair shops. BUT!! the analyzers show nothings wrong? So there just guessing to replace the airflow meter or the pressure valve under the manifold? But I ain't got a gold mine in my lower half & know from past experience you just guess at these new cars lol? any ideals?

i would start at basics. have the fuel pressure checked when the problem ocurs.

coolant sensor, injectors being serviced, are some of the other items.

a scan tool will never tell you the issue by itself, only lead you in the right direction of the failure.

Roy