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New plugs, tested plug wires, air cleaner, sprayed MAS

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  • Wayne Myhre
    Wayne Myhre Apr 06, 2015

    engine sometimes hesitates upon acceleration when warm

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  • Cars & Trucks Master
  • 1,249 Answers

Don't know your model, but if you have changed all of these parts, don't overlook vacumn lines off or cracked...

Posted on Apr 06, 2015

Testimonial: "a fellow non pro left remark about spraying the optical cam position sensor with MAS spray. (located under the plate under the rotor in distributor) I did and it is running fine."

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I have an 2004 chevy impala that has gas a new starter, new switch ignition, and new fuel pump installed. Why is my car still not starting when I go to crank it up?


Sixty years ago my daddy told me an engine needs four things to run:
  1. Fuel
  2. Air
  3. Compression
  4. Ignition
Air is generally a given, and you can hear compression--the sound the car makes while cranking, the rhythmic sound.

Fuel: Crank it for a bit and then remove a spark plug. If it's not wet, there's no fuel. Possible clogged fuel filter, blown fuel pump fuse, or fuel pump is disabled because automotive security thinks you're using a fake key. You can also test for no fuel by getting an aerosol can of carburetor/throttle body cleaner and spraying it in the inlet while someone else cranks the engine. If it runs as long as you are spraying, there's no fuel.


Ignition: Take off one spark plug wire at the plug. Insert a plastic-handled screwdriver into the wire-end. Hold the handle so the screwdriver shaft is within 1/4" of any engine part. While someone cranks the engine, you should see a blue spark jump from the screwdriver shaft to the engine if there's ignition.

Carburetor Cleaner at AutoZone com Best Carburetor Cleaner Parts for Cars...

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Oct 02, 2015 | Cars & Trucks

1 Answer

There is a plug that goes in the engine under air cleaner


Sounds like the air mas sensor but if that was unplugged yourc car would not run.

Dec 31, 2013 | 1995 Cadillac DeVille

1 Answer

Tune up


A "typical" tuneup consists of plugs, wires, air cleaner, pvc valve and a good throttle body cleaning. Also if your car has a mas air flow sensor then clean that (just be careful not to damage the sensor)

Jul 11, 2012 | 1995 Ford Crown Victoria

2 Answers

My 2004 chevrolet colorado is chokin when i stop. how do i check the spark plug wires?


Measure the resistance. But if you had bad plug wires you should get a Service Engine light with a misfire code.

Sep 27, 2011 | 2004 Chevrolet Colorado

1 Answer

My 1997 Ford Taurus stalls when I accelerate. It only happens about 5 to 10 minutes into my drive. It starts up fine. If I am driving and the car stalls on acceleration, I can turn the car off and back...


Replace first, the fuel filter if this has not already been done. You may have a plugged filter, and these are very inexpensive. If this does not resolve the issue, locate the MAS (mass airflow sensor) located between the throttle body and the air filter housing. Start the car and let it idle normally; with a screwdriver handle or other such small tool, tap the mass airflow sensor (small black unit; will have a wiring harness hooked to the side of it); if the car dies, stalls, hesitates; first purchase MAS cleaner at the local auto parts dealer - specifically ask for Mass Airlflow Sensor Cleaner. It will should cost between 7-12 bucks - but you wont need the whole can - however, when using it: (if the car does not die, stall or hesitate and the idle stays the same, than the sensor is not bad) If it does however:
1. Remove the MAS (disconnect wiring harness) you may need to pull the top end of the air filter housing off.
2. Spray inside the sensor generously from both ends ensuring it's entirety is sprayed. Let stand for 15 minutes to airdry.
3. Re-install the sensor and start car. If there is still no improvement and the car hesistates, 1. Ensure the air filter as well is in good repair, and that there is nothing causing any air flow restriction between the airfilter and the throttle body.
4. If the airfilter is good, and there are no restrictions to air flow, consider replacing the MAS, however if you can get the car to the auto parts dealer, or to a technician (who may charge; auto parts dealers usually don't) have them run a diagnostics test on the car.
5. At this point, if cleaning the sensor has made no improvement, and the car stays idling, does not hesitate when tapping the sensor, the air filter is good, the fuel filter is good - then the next step is to replace the fuel pump.
Please let me know if you need further assistance.
carsandcomps,

Sep 26, 2011 | 1997 Ford Taurus

1 Answer

Engine just shuts off and wont start


1.(check air filter to ensure it's installed correctly and not ripped, or torn or plugged; if it's in good condition and installed correctly, then) Purchase MAS cleaner (MAS = Mass Airflow Sensor) This is located on the air intake hose, between the front most part of the car (filter canister) and the intake.
2. Remove the MAS and spray generously inside the sensor. This cleaner is made specifically for this sensor, so it will not harm it. Let it air dry for about 15 to 20 minutes. Re-install the sensor, and start the car. If there is no difference, consider replacing the sensor.
NOTE: Before all else, if you can get someone to run a diagnostics test, this will bring up any codes for any problems the machine can detect, and will most likely detect this issue, as it is most likely computer (electrical) related.
Please let me know if you need further assistance.
carsandcomps,
Guru, Premium Expert, Phone Assistance, @ Fixya.com

Jun 09, 2011 | 1992 Oldsmobile Cutlass Supreme

1 Answer

Multiple cylinder misfire, codes P0354, P0356, P0357, P0361


clean the MAF, Mas Air Flow Sensor in the air intake tube first. Use carb cleaner or MAF cleaner. Do not touch the 2 sensor wires that you spray. delicate!!

ALso, put a bottle of Chevron Techron Fuel injector cleaner in the fuel tank, 1/4 tank or less.

Try that first. Also, replace spark plugs, put antiseize on the threads. Last resort is to replace the COPS, Coil on plug for each offending cylinder.

Misfire Definition: A misfiring cylinder is lacking power relative to the other cylinders. The causes for a cylinder specific misfire could be fuel, spark, or mechanical problems. Perform a thorough visual inspection. If no visible concerns are found use the following WDS tools for misfire diagnosis:
  • Self-test (Check for codes first)
  • Power Balance (Identify the cylinder of concern)
  • Relative Compression (Rule out a possible mechanical issue)
  • Fuel (Make sure fuel injectors are not restricted) (plugged)
  • Ignition (Make sure spark plugs and coils are working properly)
  • Oscilloscope (Detailed signal analysis)

Nov 22, 2010 | 2001 Ford Expedition

1 Answer

I have a honda accord 2003 model 2.3 16 valves engine the problem is that when the engine gets warm up after five or six kilometres the engine gets off while braking or shifting the gear


Does the engine shut off?

Try replacing the air an fuel filter - also tap on the MAS (mass airflow sensor) which is located between the air filter casing and the intake (throttlebody) - if the car dies, hesitates it may need to be replaced.

First, do the air and fuel filter. If this does not solve the problem, then purchase MAS cleaner. Pull the unit out and spray the inside generously with the cleaner. Re-install and drive. If the problem still exists, try replacing the MAS.

If not this, it could be either the crankshaft sensor, cam shaft sensor, harmonic balancer, O2 (oxygen) sensor(s), or the catalytic converter may be plugged.

Take the car first to an auto parts dealer (Napa, Baxters, etc) and have them run a diagnostics test to determine any codes that will let you know what components may be malfunctioning, not working, and need replaced.

Please let me know if you need further assistance.

carsandcomps,

Guru, Premium Expert @ Fixya.com

Jun 22, 2010 | Cars & Trucks

1 Answer

My plymouth voyager 1998 stalls when slow but starts again


start the van and let idle.

With hood up, find the MAS (mass airflow sensor)

Using a screwdriver handle (or other small tool, with mild weight), tap the MAS.

(This is found midway between the airfilter and the intake manifold on the air intake hose).

If the van stalls while idling, (tapping on MAS) or dies, the MAS may need replaced. First, purchase some MAS Cleaner at a local auto parts dealer.

Remove the MAS completely and spray the sensor cleaner inside the sensor generously. This is specifically formulated for this sensor and will not harm the sensor itself.

Once you have sprayed the MAS (from both sides), let air dry for about 20 minutes.

Install the MAS and perform the test again (tapping). If the van stalls or dies still, then the MAS needs replaced.

NOTE: the van will not start if the wiring harness for the MAS is not plugged in, so be sure to plug this back in after reassembly. (should be on left side).

If it does not (at either first or second test) stall or die (idle does not change at all) - check the following:

1. Air Filter - you'd be surprised how much an air filter (or lack thereof) will have on engine performance.

2. Pull the cap of the distributor and examine the inside of the cap as well as the rotor. The rotor may need replaced if it is cracked, or if the metal tip (curved) is worn (i.e. white, rough texture).

3. Examining the cap, look at the metal stubs (mistakingly called points) on the inside and notice if they are grooved, white and/or worn. If so (and most likely are) replace both the cap and rotor. These are fairly cheap for this van. Price differnet auto part stores for best purchase price.

4. As a safe measure, replace both O2 (oxygen) sensors. These are bit more spendy, however they too effect the perfomance and gas mileage. There are two on this van. The first, sits directly behind the engine on teh exhaust manifold. Easily excessible and fairly simple to remove. The second is located on the passenger side directly under the passenger seat after the catalytic converter.

A special socket is used to remove these, however if you cannot afford to buy this, simply use and open end wrench, but unplugh the wiring harness first or it will twist up.

Installation is the same - thread in by hand, then tighten, then plug in the harness. NOTE: the second one will seem a bit more difficult as the wiring harness is protected by a rubber "skirt" that is pushed into the bottom of the van - simply pry this out with a flat head screwdriver, making sure not to rip it as it is a soft rubber. Pull it out and the harness will pull with it. Unplug and replace unit.

NOTE: if your engine light is on, in most cases it is due to either the O2 sensor(s) - or the EGR valve - this is located on the driver side about level with the intake with two-three vacuum lines coming out of it.

Here's a "free" tip: If your tranny starts to slip. Stop driving it IMMEDIATELY. Replace the inner seal (behind torque converter) and the torque converter (as a safe measure).

I had this happen and failed to do so (lack of knowledge) and ended up scrapping my van. It only had 112,xxx miles on it, and the tranny was the ONLY thing wrong with it.

If you have any questions, comments or concerns please let me know.

carsandcomps,

Guru, Premium Expert @ Fixya.com

Please view my tips for additional automotive information and "know hows".

May 14, 2010 | 1998 Plymouth Grand Voyager

1 Answer

Where is the map sensor located? 1994 jeep grand cherokee


Go half way between the air cleaner box and the "carburetor". Up the 4" black air pipe, a wire harness plug plugs into the MAP sensor there. Also called MAS air flow sensor.

Oct 05, 2009 | 1994 Jeep Grand Cherokee

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