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My truck lopes when I first start it.Then it smoothes out.If I give press and hold the gas pedal lightly it also smoothes it. What is causing this?

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you don't say where the noise is. that is important to give a clue where the issue is. when stopping on the brakes 3 things happen. you press the pedal and the abs pump starts pumping fluid. the second is the brake capilers start pushing on the rotors to slow the car. the rotors are attached to the wheels and that stops the car. so if the rotors are warped you will feel a vibration in the steering wheel when stepping on the brakes. if its your foot feeling the pump working that is normal for abs pumping. you should feel it and holding the pedal will keep it working and stop you from skidding if everything is working correctly

Mar 10, 2015 | 2004 Pontiac Aztek

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Hard to start, need to press gas pedal to start

try cleaning the throttle body out first...check engine light on?..possible coolant temp sensor...some problems have multiple causes and are hard to diagnose without actually seeing the vehicle...if you have to hold gas peddle to floor it usually means car is flooded (too much fuel) ...check fuel pressure to see if it bleeds off when not running...could be an indication of leaky injectors or fuel pressure regulator

Apr 01, 2014 | 2004 Chevrolet Impala

1 Answer

Car lopes as soon as it warms up

idle air control is looking for base idle. throttle body base idle plate is dirty with carbon. cleaned out throttle plate with carb cleaner and tooth brush. use rags to catch black some one hold throttle plate open with gas pedal. engine not running. after completed, start engine. run 1500 prm for a short time to clean out excess fluid. that should fix your problem..

Jan 18, 2013 | 1991 Chevrolet Corvette

1 Answer

Ok when i stop at a light i have this lope but if i sit there for a few it will smooth out for 2 or 3 seconds then go back to loping at a constant speed it is smooth but if i try to give it a little gas it...

Lean misfire,when you give a vehicle a load,the demand for spark or the KV is increased,if the spark does not reach its intended load and cross fire the stumbling begins,spark from spark plug wire seek the easiest route which is ground,whether it be at the coil itself spark wire leaking you are dealing with a ignition misfire

Nov 12, 2012 | Cars & Trucks

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Ford Econovan 89 1.8L Gas Engine turns on fine, once i turn key to start. smooth idle nothing sounds wrong once i give it a little gas while holding the the gas pedal down a little it stalls and...

There are many things that can cause this. Do you have a check engine light on? Have your mass airfow sensor checked, also the throttle position sensor. Have your fuel pressure, and volumn checked, also the fuel pressure regulator. If that all checks out ok, suspect a restricted cat. converter. There is an inexpensive backpressure test that most shops can perform.

Aug 14, 2011 | 1989 Ford Econoline

2 Answers

Check engine light came on. Had diagnosed and these codes came up: PO 506 PO 2104 PO 2112 Where should i start??

Start with the throttle sensor on the gas pedal, check with voltmeter one wire should have 5.0 volts one of the other should get more voltage as you press the gas pedal.

Dec 09, 2009 | 2005 Ford F-150

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Was loping in drive, would have to put in neutral, now stalling in neutral, at first i thoght it was the fuel injector, not sure

engine runs smooth if giving more than idle pressure. It is when the motor is engaged with transmission at start the engine lopes and wants to cut off. If I press the throttle hard it takes right off. If I come to a stop I can put transmission in neutral to keep it from cutting off. This creates a shifting that is not normal and I'm afraid it is a sign of failure coming.

Sep 28, 2009 | 1990 Mazda 626

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