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SuperDave, ASE Certified Technician
Category: Ford
Satisfied Customers: 1491
Experience:  over 16 years experience
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99 ford f 250 super duty, idels rough but when give gas

Customer Question

99 ford f 250 super duty, idels rough but when give gas dies, will restart but repeats over and over again, no codes on scanner
JA: Have you scanned the code? Have you tried to reset it?
Customer: yelp
JA: What is the model/year of your Ford?
Customer: 1999 5.4 triton v8
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: traced vacum lines got code that dpef senso and air volume sensor bad replaced and p[roblem persists
JA: Anything else you think the mechanic should know?
Customer: nah
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Ford Mechanic about your situation and then connect you two.
Submitted: 1 year ago.
Category: Ford
Expert:  HDGENE replied 1 year ago.

Hello, you replaced the dpfe and maf sensor for codes, those codes are gone now? Will it pass a key on engine off and key on engine running test with a scan tool? No vacuum leak on the pcv hose/collapsed? Have you checked fuel pressure with a gauge?

Customer: replied 1 year ago.
all of these and still a stubborn truck
Expert:  HDGENE replied 1 year ago.

Ok you checked fuel pressure and it is good? It passes on demand testing with a scan tool? How many miles are on the engine?

Customer: replied 1 year ago.
295000, passed test
Customer: replied 1 year ago.
think something could be wrong in throttle body, idles rough but give a little gas and it dies
Expert:  HDGENE replied 1 year ago.

And it has a rough idle and stalls when you throttle up or only when put in gear? Throttle body bore clean?Original engine? Have you run a compression test? Erratic vacuum gauge readings if you hook up a vacuum gauge?

Customer: replied 1 year ago.
original throttle body clean, compression test are good for each cylinder, she has been taken care of over her life and it is the original engine.
Expert:  HDGENE replied 1 year ago.

This many miles,something isnt adding up...... these engines are known for valvetrain issues, main bearing wear issues, phaser issues. Its hard to believe everything you are testing is ok, no codes, good compression...

Expert:  SuperDave replied 1 year ago.

Your problem could be nothing more than a dirty mass air flow sensor.This will cause that problem without throwing a code.Clean it and see what happens.

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