Question about 1989 Ford Mustang

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Mass air flow problem

I dont have a scanner for this model mustang but what happenes is ,if i take off the mass air flow connector the car run fine.but once i put the connector back in it wont rev up more 2000rpm and it back fires.i put in a new motorcraft mass air flow.but the problem is still there.thanks

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Check this: see that your black flex hose is secure or if it has a break in it anywhere. If it has the break or it not secure; it will give the same reaction. Take it off; try to look at it through the light, or make sure you check the edges, that they have'nt gotten brittle, and they wont seal. another simple test: wrap hose with saran wrap or tape a plactic bag around the hose. place it on; if it stops the condition:replace the hose: if not: check the calibration on the MAF to see you gotten the right sensor/

Posted on Sep 03, 2009

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This sounds like a processor/ECM issue, replace it.

Posted on Sep 03, 2009


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1 Answer

What will make it not start untill you give it gas then starts

remove the mass air flow connector from the sensor located in the air intake just before the throttle body. if the engine runs better change the sensor. this happened to my car and there were no fault codes. i changed the sensor and all is well

Jun 28, 2014 | 2002 Ford Mustang

1 Answer

Check engine light reads...po411...or, secondary air injection system-incorrect flow...what does this really mean???

sounds to be low air flow. Check filter . could be a faulty mass air flow sensor. good luck

Nov 05, 2012 | 1998 Ford Mustang

1 Answer

Car quits running after warming up codes that come up are po135 02 sensor heather bank 1 sensor 1 and po101 mass air flow a circert ran of performance

the o2 heater circuit won`t cause a quit running problem.however a mass air flow problem will.i would check the voltages at the connector and compare to specs and also condition of the connection.these have a problem with a small amount of dirt covering the mass sensor wire.if you clean the wire from both sides dry it and re-install this may cure your problem with the code.if the voltages are not in spec then the mass air flow sensor is defective.the code for the o2 voltages needs to be checked and the connector for corrosion if the voltages are good and connector is good to the o2 then you have a bad o2 sensor

Mar 02, 2011 | 1999 Buick LeSabre

1 Answer

C220-manual transmission. erratic idling and sometimes idles up and down. Has been serviced and throttle body cleaned but still does this. Happens more often when the engine is warm.

according to your information it's faulty mass air flow sensor, check mass air flow sensor first, when the Idle rough just disconnect the air flow sensor wiring socket if it's better than when it's connected it's faulty air flow sensor, mass air flow sensor have fitted between air cleaner housing and throttle body, you can see wiring connector been connect on it you have to turn it anticlockwise and remove it. when you fix it back do the reverse order, if it's faulty replace air flow sensor. is this information helped you?

Oct 31, 2010 | 1994 Mercedes-Benz C-Class

2 Answers

1991 Ford Mustang 5.0 L HO, had been setting up for 10 yrs. cranked & ran good a few trips around the block, and then stopped idleing or running smooth under 2,000 RPM. Could it be the Mass Air censor?

Mass air flow would probably shut you down. You could clean Mass Air Flow Sensor and see what happens.Try scanning for codes then looking for vacuum leaks. Use a propane tank with a gauged nozzle to help look for vacuum leaks.

Aug 16, 2010 | 1991 Ford Mustang

1 Answer

Runs rich very strong exhaust.replaced plugs 02 sensor. wondering if its the mass air flow sensor.

have you checked the air filter - a partially clogged air filter would make it run too rich. Also it's 15 year old car, check all the connectors and wires under the bonnet for security and cleanliness - dont suspect anything till you know the wiring is good.
Air flow sensor is highly likely - you're right to suspect it... but it could be a faulty temp sensor or even a faulty ECU.

Jan 23, 2010 | 1995 Kia Sportage

1 Answer

2001 mustang gt 4.6 liter, will only start if I remove the vacuum hose to the front of the throttle body and cover with my thumb, then I have to remove immediatley and put the hose back on. Then I have to...

rap on to the mass air flow sensor and see if the idle chages. if it does its bad. Use a block of wood such as a foot long 2x4 it works great for this test

Jan 17, 2010 | 2001 Ford Mustang

1 Answer

2001 mustang with code P0104 the scanner says that EGR flow

P0104 code is MAF or VAF. This can cause surging and rough running. If you disconnect the maf and find that it runs a little better, you can be sure that a maf replacement is in order. Double check the code by erasing it then roadtest. If code comes back then it is a hard code.

May 07, 2009 | 2001 Ford Mustang

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