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2003 Ford Mustang

Tiny
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  • 2003 FORD MUSTANG
Engine Performance problem
2003 Ford Mustang V8 Two Wheel Drive 100, 00 miles

CAR STARTS GREAT WHEN COLD, BUT AFTER IT WARMS UP AND I SHUT IT OFF AND TRY TO RESTART THE ENGINE WONT START THE FIRST TIME RECRANK AND IT STARTS FINE, PUMP THE GAS ONCE WHEN WARM, IT ALSO STARTS FINE HAD THE FUEL PUMP PRESSURE CHECKED ALL GOOD
NO BLEED DOWN OTHER THAN THE WARM STARTING PROBLEM ENGINE RUNS STRONG AND IDLES SMOOTH
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Thursday, April 8th, 2010 AT 9:12 AM

7 Replies

Tiny
RACEFAN966
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Ok if you would next time you have this problem unplug the mass air flow sensor and see if it starts back up then. Let me know what you find here and we will go from there. Also do you have a digital multi meter?
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Thursday, April 8th, 2010 AT 9:24 AM
Tiny
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THE SAME PROBLEM WAS THERE WITH THE MAF SENSOR UNPLUGED WOULD NOT START ON FIRST TRY. ALSO YES I HAVE A MULTI METER
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Friday, April 9th, 2010 AT 5:21 AM
Tiny
RACEFAN966
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Ok great eliminated that as a problem. Now if you would pull a spark plug wire and put an old plug in it or a philips screw driver and crank it when it won't start and let me know if there is spark ok. We will be checking the cam sensor here so you will need the digital multi meter at that point.
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Friday, April 9th, 2010 AT 10:03 AM
Tiny
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The spark was there I also changed both crank &
cam shaft sensor two month ago for a check engine light came on and the code said both were bad thai
didn't fix the starting problem. Could the IAC valve be bad?
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Monday, April 12th, 2010 AT 6:25 AM
Tiny
RACEFAN966
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OK if you have spark then we need to know what the fuel pressure is. If you get back to me with that we will go from there. The IAC could but lets make sure the needed and basics are there first ok. Let me know what you find out.
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Monday, April 12th, 2010 AT 11:58 AM
Tiny
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42psi running and maintain 40 psi with engine off
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Tuesday, April 13th, 2010 AT 6:28 AM
Tiny
RACEFAN966
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Ok if you would when the engine is cold unplug the coolant temp sensor. Ohm the sensor across the two terms and then get back to me with the ohms and the temp at the time you checked it. The IAC if you would unplug and ohm it too. Get back to me with your findings.
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Tuesday, April 13th, 2010 AT 8:06 AM

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