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

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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?

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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.

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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

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1 Answer

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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.

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