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mustang loses power when accelerating

Aug 5, 31 0 6 Jacksonville, AR. Searched the web and keep coming up with other people having the same issue but no conclusive fix.

I'm having some trouble with my 90 LX 5. Starts and idles fine. Accelerates strong one time, then the next it just sputters and stumbles like a bad fuel pump. In process of trying to fix it I've thrown the following parts at it. New lph fuel pump, new fuel filter, new O2 sensors, new MAF, new upper intake manifold gaskets, new ACT sensor, new vacuum lines, cleaned grounds, new distributor pickup, new spark plug wires, new fuel injectors. Replaced Evap system lines was plugged up but fixing system had no effect.

Mods are just typical bolt ons. Good compression. The plugs are about 6, miles old or so. Honestly I doubt it's plugs because the issue is so intermittent. Fuel pressure regulator is an adjustable type and isn't leaking. EGR passages seem fine. No KOEO codes. No catalytic converters. No vacuum leaks that I can find. The only thing that I know is wrong is there's a baffle loose in the gas tank. Any ideas? Thanks in advance!My car has difficulty accelerating.

There is a loss of power when I try to increase speed. I tried to press the gas pedal all the way, but there is no changes in RPM or acceleration. I had the filters replaced. It would sometimes run normally if I release the gas pedal and press it again.

What could be the problem?

mustang loses power when accelerating

Thank you. It sounds like you may have an issue with your throttle position sensor. This sensor sends a reference voltage to your power-train control module, which uses that to determine ignition timing and fuel trims. If the power-train control module is not detecting the proper signal from the throttle position sensor, the engine may not accelerate properly.

I would recommend having your throttle body inspected by a qualified mechanic, such as one from YourMechanic to determine why your car is slow to accelerate. Explain your symptoms and have the mechanic drive the vehicle to verify the issue. Andrew Quinn Automotive Mechanic. Thank Andrew. Was this answer helpful? Thank you for your feedback!

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Related Questions. My car is skipping. How to change a fuel filter in a Nissan Quest? How can I fix a ticking noise coming from the engine to my Pontiac torrent ? Car jerking when switching gears by Yvonne R. Car hesitating on acceleration.Forums New posts Search forums. Media New media Search media. Resources Latest reviews Search resources. Log in. Search Everywhere Threads This forum This thread.

Search titles only. Search Advanced search…. Everywhere Threads This forum This thread. Search Advanced…. New posts. Search forums. Thread starter misko Start date Aug 17, JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding. Aug 7, 4 0 0. When cold runs great no problem. After warming up to normal operating temperature with new thermostat my Mustang gt looses power when accelerating hard while parked or driving rpm.

Sensor, Coil, and Fuel Filter, all to no avail.

Car Losing Power While Driving? - Diagnose & Repair

I am stumped. Could the PIP cause this problem? Any help on this matter is appreciated. Dec 18, 2, 4 59 Bedford VA www. Oct 3, 0 0 south atlanta. Ryno New Member. Jul 16, 8 0 0 Rockford, IL. One quick thing would be to check the voltage on your TPS to be sure it's around 1 volt closed and above 4.

mustang loses power when accelerating

Where the wire enters the harness is rubber, put the end of a voltmeter up the harness parallel to the wire pushing the rubber out of the way until you get a reading.Forums New posts Search forums. Media New media Search media. Resources Latest reviews Search resources. Log in.

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Out Of Nowhere, No Power, Sputters & Backfires. Same Thing At Idle Under No Load?

CNK New Member. May 25, 10 0 1. I was driving my 91 mustang for about an hour. Everything was absolutely fine. Turned the last corner to go home, and the car seemed to sputter as if it was gonna run out of gas As I knew the gas was close to being emptyso I immediately went to the gas station, left it running while putting gas in it.

Regardless of rpm, load, in gear or in idle. I sputtered and backfired around the block to the house never getting over 3 mph, never get any rpm up, just bump along and not trying to stall. This was late at night. Next morning got up, cranked the car up and same things. Please advise, cause I have no idea where this even started!!! Nov 29, 7, 6, S. Aug 27, 9, 6, In the garage. Reactions: toolow Replaced the air pump check valve that was broken.

Car ran great for 10 minutes, then the same power loss occured, and now won't even crank. Will turn over, but not light off??? Mar 10, 27, 2, 74 Dublin GA lowendmac.

Cranks OK, but No Start Checklist for Fuel Injected Mustangs A word about this checklist before you start: it is arranged in a specific order to put the most likely failure items first. That will save you time, energy and money. Start at the top of the list and work your way down. Jumping around will possibly cause you to miss just what you need to see to find and fix the problem. All text applies to all models unless stated otherwise. Note: specific changes are in red 1.

Place car in neutral or Park and set the parking brake. Jumper the screw to the big bolt on the starter solenoid that has the battery wire connected to it.What would cause my v6 mustang 3.

Note — That i already changed the spark plugs, spark plug wires, coil pack, and throttle body sensor. Most of the time the cause for the problem you describe IS ignition related, but it seems you took care of all that. The next thing I would look at is low fuel pressure or plugged catalytic converters.

A fuel pressure gauge on the fuel rail would be needed to check this. Possible causes are a weak fuel pump or plugged fuel filter. To test for this, you would actually need a backpressure gauge in one of the oxygen sensor holes.

The other way is to disconnect the exhaust pipe before the converter and see if the engine power comes back to normal.

mustang loses power when accelerating

I have a 98 mustang 3. It has been having a hesitation when accelerating between rpms. We have cleaned everything that we could and also changed vacuum lines. But last night as we started it up there was a ticking sound which sounded like a bad exhaust leak so we stuck a screwdriver to the intake and the sound is coming from the injectors on the passenger side. Any help with the would be greatly appeciated. What you are describing does sound like an engine misfire. This is usually caused by bad spark plugs, spark plug wires or ignition coils.

I would start with a major tune up. Other possible causes- sticking fuel injectors, low fuel pressure or a sticking EGR valve. All injectors tick, but if it is excessive, then you may have gotten some bad fuel and caused damage to the injectors if you are hearing ticking on just one side of the engine. Are you sure it is not rocker arms ticking? That would be a cam problem, oil pressure problem or rocker arm problem. Name required :. Mail will not be published required :.

Notify me of follow-up replies via email. Skip to main content. December 28, at am Reply. Marcus Riojas. June 14, at pm Reply. Jessica Marlow. December 28, at pm Reply. January 3, at pm Reply. Reply To: mustang looses power when accelerating Your information: Name required : Mail will not be published required :. Cancel Submit.The car also sputters and rpm begins to fluctuate while driving. I want to fix this myself but I'm quite the car newbie.

Dear PoppaQ-- I could list 25 reasons why your car is sputtering while driving, but let's start with the most simple solutions first. It may be your fuel injectors. Buy some fuel injector cleaner at a parts store. Run a tank of gas with that and see what happens. I would also check my airfilter. If it is clogged or dirty it could be contributing to your trouble. If neither of these work we may have a clogged fuel filter, some spark plugs or spark plug wires in need of replacement or even a bad fuel pump.

Start with the easy cures and let me know how you do. Good luck from Bovan. When the weather clears up I will pop the hood and check the air filter. I think I just replaced it last year PhotoOp answered 9 years ago. I have a Pontiac Torrent.

While traveling home on the freeway at 65mph the engine began to stutter, especially when trying to go up any type of grade. I slowed down to 50mph before the "stutter" went away. I had a similar problem while traveling in Florida. At that time it was determined to be a "blown" spark plug, whatever that means. I have a grand prix and recentl went on a road trip. I got worse than normal fuel mialage so I change my fule filter. It was fine for the drive home but I now get the sputtering when taking off until I get up to higher rpm's.

Is it possible that I am sucking in air through the fuel filter connections? Or could changing the filter have caused any other problems with my car such as the air intake sensor not sure what its actually called. TomcatSuperD answered 8 years ago. My GTP experienced the sputtering problem at 28, miles and it was the result of a defective wiring harness.

I assume this to be very unusual but it can be the cause. Best of luck.

1999 Ford Mustang Loss of power while driving

The same sputtering and shaking that you report. My engine had only 28, miles on it at that time and now hasmiles and runs smoothly and produces a bunch of power.Password Forgot Password? Join Us! Join Date: Sep Posts: Rough Idle, hesitation on acceleration, loss of power. When I start the engine its starts up right away with no issues. As its idleing however, the rpms fluctuate up and down erratically and then it'll smooth out for a few min and then it will begin again. When I take it for a test drive its worse.

If I accelerate it will hesitate big time and I can a feel a noticeably loss of power. If I floor the gas pedal it'll hesitate, then take off full power for about 3 seconds and then completely loose power as if though the motor was shut off but if I let off the gas it will idle between and sometimes wanted to shut off. I'm being told that there is a possible vaccum leak but I've looked everywhere I could see a vaccum leak anywhere so no luck there.

I was then told to take a look at the fuel pressure reg by checking the vaccum line for any evidene of gas in the line, no gas in the vaccum line so I'm assuming its ok. I haven't check yet but will a lil later to verfiy the lower intake manifold is on tight because I could have a leak there. Please if anyone has any ideas that would be great.

Oh yes one more thing obviously gas economy is herendous, and I can smell the gas coming out of the tail pipe.

So much so my eyes start to hurt. Last edited by tchachee; at AM. Join Date: Oct Posts: 5, Re: Rough Idle, hesitation on acceleration, loss of power.


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Mustang loses power when accelerating
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