Question about 1999 Ford F150 Regular Cab

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Pinging explorer v8 1999 4*2

Heavy pinging under acceleration it runs on freway 20-21 mpg , I have cleaned the mass airflow in air intake, the motor have 109000 miles. Any idea what that I can do. ?
tks.
Bent

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It's called spark knocking get timing checked or try a tune up and better gas

Posted on Dec 08, 2008

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Why is my 2003 nissan Pathfinder stuttering and bucking all of a sudden?


Try unpluging the M.A.F. (Mass airflow meter) It will be on the intake pipe between the air filter and turbo. Start it up if it run's ok then replace. It will run without one but will be less MPG and may cause other problem's over time if not replaced

Aug 11, 2014 | 2003 Nissan Pathfinder

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1998 buick lesabre stalls at times when stop and start acceleration again.


Hi Alan:
You might have an air or a vacuum leak. This is very common! Open the hood and listen for a hissing sound when the engine is running. Unmetered air can enter the engine through a vacuum leak, a dirty airflow sensor that is not reading airflow accurately, an EGR valve is not closing and is leaking exhaust into the intake manifold, an EGR valve that is allowing too much flow.
If it is hard to pinpoint take some brake cleaner or starting fluid around the intake manifold and vacuum lines and see if the engine stumbles or if the idle is affected.

Also, your throttle body may be carboned up and need to be cleaned! This can cause all sorts of idle and hesitation problems. This is caused by the throttle plate not seating properly. The First thing i would do is clean out the throttle body with some throttle plate and intake cleaner and a small brush. Another common cause would be the Idle Air Control motor. This is very common on older cars. The IAC motor gets lazy and cant keep up with the fast idle changes. Also when the IAC motor is out, I rec to check the passages for carbon build up. If they are plugged they need to be cleaned out.

Possible Causes
Check for air leaks in the Air Induction system (e.g., in the intake manifold)
Check for air leaks in the PCV system and in its related hoses and/or valve
Idle air inlet passage or throttle bore is dirty or full of deposits
IAC valve has failed
MAF sensor is dirty, "skewed" or installed improperly
Throttle plate, throttle shaft or linkage is damaged or sticking
TP sensor is out-of-range or "skewed" high

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

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Dec 22, 2011 | 1998 Buick LeSabre

1 Answer

My 1991 240DL volvo has a hard start, and while idling, goes up and down, then eventually stalls out. The air flow sensor/air mass meter? was unhooked, and the car idled smoothly. Is it true that the car...


When you unplug the mass airflow sensor, the car goes into "limp home" mode in which it runs full rich. Generally speaking, if a car runs better with the mass airflow sensor unplugged than with it plugged in, the mass airflow sensor has failed.
However, the drifting idle tends to make me want to look for vacuum leaks and check the rear temperature sensor on the driver side of the head. I suspect that running over-rich is compensating for the vacuum leak so the car keeps running.
If you have a propane torch or a can of diesel starting ether, spray it around the intake manifold while the car is idling and see if the engine speeds up. If so, then you have found a vacuum leak.
If it were mine, I would buy a new intake manifold gasket and replace it as a routine maintenance item. It is not expensive or difficult to replace except that if you are like me, you WILL drop at least one nut, and there are several great hiding places on that side of the engine where the nuts go to hide when you drop them. You will need a magnet to recover them. You don't need to pull the manifold clear off, you just have to pull it clear of the bolts so you can slip in a new gasket. You can leave the throttle cables and most of the other connections hooked up
If you know how to use an ohm meter, you might consider getting a manual for this car and looking up the appropriate resistance/temperature values and checking that rear temperature sensor.
While you are replacing that intake manifold gasket, check all the vacuum ports to make sure they are clear, and check all the vacuum hoses to make sure they are intact. Also check the tubes between the mass airflow sensor and the throttle body for cracks. While you have those air tubes off, clean the throttle body and the idle air control valve with some carb cleaner. Spray a little carb cleaner through the mass airflow sensor as well. Actually, there is a special spray for cleaning mass airflow sensors that is more gentle, but I have used carb cleaner on them many times with no apparent ill effects.
If it turns out that the mass airflow sensor has failed, that will run some $$, but having a fresh intake manifold gasket and clean throttle body and no vacuum leaks will be worth your time and money and make the car run better when you are done.

Jun 07, 2011 | Volvo 240 Cars & Trucks

1 Answer

In my '98 Century I am having serious hesitation while accelerating... Only happens sometimes, but frequency is increasing. When the problem occurs, I will drive for a bit, and when put in park, idle...


P0101 Mass Air Flow, P0300 random misfire, Your problem is the Mass air flow, the P300 is the result of the mass air flow range, Mass air flow is a hot wire sensor they fail when contaiminated, as for the P300 that the engine detecting the condition when the mass airflow range is out, but here is another problem 1998 Buick used a back up its called a map sensor its on the top of intake plenum, make sure its seated and wire connection are there, Now you are going to fix the problem yourself if you ever taken out ,a airfilter and replaced it, then all you need to do is purchase a MAF cleaner mass airflow cleaner or brake cleaner or electrical cleaner clean the inside of your mass airflow you dont have to replace it the code is range performance the hot wire cant clean itself, so someone has to do it

May 04, 2011 | 1998 Buick Century

2 Answers

My GMC stalls on acceleration. It pings, stutters, cuts out etc. I've replaced the fuel pump and filter, the coil, the distributor, 2 sets of plugs and wires, cap and rotor, the alternator, throttle...


pull your valve cover off and check and see if your rocker arms r operating correctly while its running if u replaced all what u said it sound like u have a cam shaft problem upossibly might have cam lobes wipped out

Sep 23, 2010 | 2001 GMC Sonoma Extended Cab

1 Answer

1996 explorer 4.0 181000 miles ... cranks and idles fine try to accerlerate it dies... cranks right back up .. making a humming noise through the breather... replaced mass airflow sensor and the check...


check for a leak in the air duct between the air filter box and the throttle body. When the mass airflow sensor was replaced you may have failed to get tight connections and any leak in this ductwork will cause problems with driveability. Also check for any thin or soft ruber spots in hoses between PCV valve and the intake. Any holes in these will cause the vehicle to run poorly but normally would be noticed at idle also.

Aug 08, 2010 | 1996 Ford Explorer

1 Answer

Where is map sensor for 1994 ford explorer 4.0?


the maf sensor (mass airflow) is located under the hood, it is installed in the air intake duct between the air cleaner housing and the throttle body.

May 10, 2010 | 2004 Ford F150

3 Answers

Need to know what MAF means.


MAF stands for mass air flow sensor, this is used to tell the computer how much air is entering the engine, check the air filter,and clean the sensor with CRC mass air flow cleaner, with engine off. hope this helps,let me know Ray

Apr 13, 2009 | Nissan Maxima Cars & Trucks

1 Answer

1999 Ford Explorer where is the Mass Air Sensor located


The airflow meter is in the air filter box.Unstrap the clamp to get to the filter and on the half thats connect to the hose which runs to the throttle body is where you will find it.There are wires that run into that half.

Mar 05, 2009 | 1999 Ford Explorer

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