I'm certain this will be familiar problem to many, but ever since I got it it has had flat spots right through the rev range and serious hesitation around 3000 to 3500 rpm. Messages: 1,218. Look at the following with your scantool (as shown in Figure 7): throttle position, mass airflow (MAF), short term fuel trim (STFT), long term fuel trim (LTFT), ignition timing, and fuel pressure … No real mods (K/N, Flowmaster exhaust). Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more … The #5 was loose on my 90 300TT just like Tim's. ... 2014 Base Mustang GT Upgrades LarryJM replied Feb 16, 2021 at 12:20 PM. SOURCE: I have a 1994 mustang I would check the ends of all those little rubber vacuum hoses that are used for pollution control. The internal combustion engine is so complex that even the slightest problem can potentially disrupt the power delivery in a very serious way. 2000 Mustang GT hesitation/stutter/chugging under load Discussion in 'SN-95 and New Edge Mustangs' started by 02_Lightning, Feb 20, 2011. 1988 Ford Mustang GT 5.0L V8 Misfire - Replaced many components. The days of having to constantly adjust the throttle cable due to a loose nut on the carburetor are long gone. You may experience slow acceleration, acceleration surge at both high and low speeds, hesitation or delay in acceleration, and other related symptoms. Let's say I'm in 1st or 2nd gear, accelerating normally, and then I floor it, I feel LOTS of hesitation and a pop or 2 (not a backfire) from the exhaust. 1. Wait 7 to 10 seconds. × Help us help you. 02_Lightning Well-Known Member Established Member. Step 10 - The clutch is designed to release the engine from the transmission, when this part wears it can cause a hesitation in the motion of the car. In truth, even we expected the Mustang 390 GT to plow like an Ohio farmer. Acceleration is the sum of a couple of different parts, power, gearing, grip, and of course, driver. It doesn’t. ... now every acceleration from a stop results in the car hesitating. Fully depress and release the accelerator pedal 5 times within 5 second. I started to pull away from a stop and the throttle did nothing. She did , and has been driving on that motor fore over 2 years and still doesnt have any major problems with it. The feeling is unmistakable. I have been having trouble with my 95 Mustang. 2015 mustang GT hesitation and lag.. drive by wire? engine hesitation when maintaining a speed 25 Answers I have a 2003 grand marquis with 90,000 miles, when I am maintaining a speed I feel a jerking sensation. Feb 20, 2011 #1. 1995 Mustang Gt hesitates during acceleration w/the occasional backfire, check engine light comes on and off. Ok, I just signed up about 5 minutes ago so let me give you a quick overview of my issue. Less than 49K original miles. Not sure why got new cap, rotor, wires and CAI. Last night it nearly stalled out at a stop sign. Don t start the engine! You can watch the tach … read more 4. 2003 Mustang gt cp, purchased from planet Ford dealership 20403 I-45 north, spring, TX 77388 (281) 719-3891 on June 28,2003. Thinking maybe the stator went back or O2 sensor/s might be bad. Turn the ignition switch to on. The car we tested had over 400 pounds more weight on the front wheels than the last Mustang … I need help with my 1999 3.8, standard GT mustang (engine was changed from v8, I recently bought it just as it is now)! It occurs only when the motor is up to operating temperature and usually under hard acceleration coming out of the lower rpm range. The surging and hesitation has not changed. Your engine either seems to bog down when you hit the gas pedal, or it takes a second or two to respond. The car files fine but like I said stumbles when I gas it. Today's modern cars, trucks, and SUVs are all equipped with an electronic throttle control system that contains an accelerator pedal position (APP) sensor.This sensor's primary job is to monitor the position of the throttle pedal and send an electronic signal to open the throttle … Replaced spark plugs/wires, dist.cap, rotor, ignition coil, and checked timing. Runs a little rough at idle, but revs up alright until it's under load, then it … I have severe hesitation when begin to accelerate up until around 2500 rpm (sometimes a popping noise, backfiring, up around the air intake), a loss of power, running very rich. I've researched several of the Mustang forums, but no one seems to have solved the issue entirely. 5) While driving at normal road speeds (after the hesitation) or accelerating and the throttle is not fully closed, there is no miss whatsoever, and the engine performs very smoothly. Step 11 - A timing belt or chain is used to keep the engine crankshaft to camshaft relationship … I have a 97 GT with a hesitation and/or rough running condition. This bad hesitation also happens when driving along at normal road speeds if the foot is taken off the accelerator for a few moments (throttle fully closed) and then accelerate again. Causes of Engine Hesitation . I got a new fuel filter just got to put it in...anyone ever experience this n figured out wat it was? ECU Accelerator Pedal Reset Procedure Note Timing is critical for this to work! She had the car since it was new ,and never had to replace it . It's not quite a stutter, not quite a stall, and it doesn't matter if the engine is hot, cold, or low on gas. I thought it might be old spark plugs and an old fuel filter so I changed both of them out. It has no power, it's hesitating, sputtering and backfiring when accelerating. I've had 4 mustangs (88, 95, 96, and 02) and have never expierenced this. 292 Posts . So I just bought a 2015 mustang GT premium 6 speed. I need to keep the RPMs above 2000 to have a smooth acceleration, otherwise is shakes and stutters. With in the last day my car started to hesitate under acceleration. If the hose is long enough you could trim … Mass air flow sensors on the Ford Mustang GT When the check engine light comes on, and you feel a hesitation or stall with the engine, it can mean something serious is happening under the hood. 2. 93 Notchback 5.0, AOD. It would also be worth checking the crank angle sensor connection which is located (as you are in front of the car) at the "2 o-clock" position on the front of the engine behind the fan. I'm happy to say I have achieved a smooth idle! My 2002 Mustang GT has an hesitation coming off the throttle at around 1800-1900 rpm's and around the 60-70mph. when i started my car and test drove it, it ran fine until a day later, where it developed some hesitation through acceleration, all gears (my car is a 5-speed, T-45 transmission), and if i shut off the car and let it sit for a few hours, it would go away. The 2006 Ford Mustang has 2 problems reported for hesitation. This valve helps the vehicle idle steady when the accelerator pedal is not pressed. Im not really a ford person , even though I got a 1999 mustang gt , but the 6 cycle motors are built very good . Forums > Mustang s197 Tech Forums > 2005+ Mustang GT 4.6L Tech > 2006 GT with a hesitation Discussion in ' 2005+ Mustang GT 4.6L Tech ' started by rickf , Apr 28, 2017 . 3. Wait 3 seconds. There are many things that can cause acceleration problems in any vehicle. Hey, I'm Justin with AmericanMuscle.com and this is our Acceleration Pack Bolt-on Build-Up for all '94 to '98 Mustang GTs. 5. I have a 98 mustang gt 4.6l v8 all stock parts, besides the exhaust, which is a straight x pipe. Fully depress the accelerator pedal for approximately 10 seconds. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) 1999 Ford Mustang GT 4.6L Poor Idle Quality, Hesitation, Misfire Posted to Ford Driveability on 4/4/2008 12 Replies vehicle was brought in for a broken intake at the thermostat i installed the updated intake with alluminum crossover it runs smooth at idle but under load it has a dead miss and on snap acceleration it blows the big hose off the dpfe sensor. My engine seems to be loosing alot of power, if i accelerate past 3500rpm my engine will start to hesitate and stumble, and if i go to wide open throttle while the engine is stumbling i will loose all power and my engine will drop to about 1500rpm and will begin jumping…almost as if i am … The car is amazing and I love it. Dash gauges lit. Discussion Starter • #1 • Jul 19, 2005 (Edited ... 2007 Windveil Blue Mustang GT Mods : … my car is a 1998 Ford Mustang GT, with the 4.6L 16 valve SOHC motor, i recently replaced my fuel pump because of a failed fuel pump. with 7,000 miles on it. Hey all, I have a 1998 legacy outback which I bought around 4 months ago. 6) Problems Switching Gears The issues with acceleration can lead to gear transmission problems as the ECM doesn’t get the correct information about the acceleration. For those having problems with hesitation, try Tim's suggestion of checking the spark plug assemblies. And that's what we're gonna be addressing here with our '98 GT and our Acceleration Pack with one exception, the driver. It has been getting progressively worse over time. Some history: I purchased my 95 GT 5 speed from a friend last year with 97,800 miles, all stock and well maintained. For some Ford Mustang GT models between 1999 and 2010, this has been a problem with the mass air flow sensor. I need to know if the automatic has ok acceleration im going from an 03 altima 2.5 with ok pick up and wanted to know if i would tell the difference? To test this condition drive the car at a steady speed, then very lightly tap the clutch pedal, if the car responds the clutch is worn. Other problems that cause acceleration stumble include vacuum leaks, low fuel pressure, a weak spark caused by low coil voltage or bad coil(s), retarded ignition timing, and contaminated gas. Ruby Red 2016 Mustang GT PP 6-MT Nov 21, 2016 #10 jbailer said: This ... For example with the Brisk RR14S I have constant rough idle and low throttle hesitation, just did not work well with them (they are more recessed than the OE plugs, so I believe they were causing erratic ignition). Average failure mileage is 79,000 miles. I was one happy customer until I drove my vehicle into their service department April 10,2004 when all hell broke loose about my Mustang; steering wheel vibration, rear end vibration and delayed shift in transmission. Engine Stalling and/or Hesitation on Acceleration due to Faulty Idle Air Bypass ... hesitations during acceleration, it may be the idle air bypass valve. Sometimes it will hesitate during acceleration but this is rare. Joined: Jan 28, 2001. They tend to go hard and /or split where they connect to the metal piping if they are over 10 years old, allowing air / vacuum leaks into the inlet manifold which upsets the idle mixture causing rough / uneven idling. Hesitation issue-2008 Ford Mustang GT Discussion in '2005+ Mustang GT 4.6L Tech' started by my1st66mustang, Jun 21, 2019. Just pulled my car out of storage and took it for a drive. When I … I told her to buy a used motor and ill put it in.