making bad sounds

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Nov 1, 2013 | 08:54 PM

Bigal700

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making bad sounds

Hi i got a 1997 ford f250 with 7.3 turbo and it all the sudden started starting hard so i thought bad glow plug had a few bad ones so i replaced them all and it still starts hard and smokes and when its cold it make a thumping sound and dont have power until its warm or at a higher rpms at low rpms it makes the sound what could this be?

Nov 1, 2013 | 10:18 PM

fordpride

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From: Livoina,La

Is it a sucking/blowing sound ?

Nov 2, 2013 | 01:44 AM

Bonanza35

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From: Norco,CA

Is the glow plug relay working? Mine would click but it still wasn't working. I replaced it and all is well.

Nov 2, 2013 | 01:53 AM

Ford4Life7.3

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Injector Orings perhaps?

Nov 2, 2013 | 02:21 AM

richdawg

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From: Spokane, WA

Could it be the EBPV? Maybe not with the thumping sound though.

Nov 2, 2013 | 08:33 AM

Bigal700

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In my opinion i think its a injector just the way it acts and i haven't checked relay my biggest thing is why the sound is there

Nov 2, 2013 | 09:44 AM

DIYMechanic

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From: Orrville, Ohio

If your glow plug system isn't working like it should be these things will really hammer and knock until they get a little heat in the engine. I;m guessing that's what you're hearing.

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Nov 3, 2013 | 01:25 PM

Bonanza35

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From: Norco,CA

Exhaust valve or EBPV? Never heard of a scanner that said exhaust valve is bad.

Nov 3, 2013 | 03:52 PM

#10

Bigal700

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Wats a EBPV????

Nov 3, 2013 | 06:45 PM

#11

DIYMechanic

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From: Orrville, Ohio

EBPV is Exhaust Back Pressure Valve. It's a butterfly valve on the outlet side of the turbo that is intended to close partially to aid in cold engine warmup. The engine can run just fine without it and a lot of people unhook it. The sensor for it tends to fail and then it closes when it shouldn't and impedes engine performance.