What was that?! - Ford Powerstroke Diesel Forum
 
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post #1 of 5 Old 10-14-2010, 11:06 AM Thread Starter
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What was that?!

I bought my truck from my dad with 56,000 miles on it. I was recently talking to him about the last service and he asked me if I ever heard something that sounds like a smack under the hood after it starts? I hadn't and didn't think anything of it. Two weeks ago the family jumped in the truck to come home and I fired it up. BAM! Sounded like someone punched the firewall! The wife even said "what the h@#* was that?" I jumped out and looked under the hood and saw nothing. Truck ran fine. Well today at lunch it did it again but this time I could feel it in the floor. Any ideas? Still runs fine and can't find anything out of the norm.

Jason

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Great White - 2003 7.3l F-250 4x4 CCSB -102,000 miles and tickin
DIY intake - 4" Straight pipe - HPX - CAT ELC - 203° t stat - billet t stat housing - coolant filter - dual alt radiator hose - 12V Air compressor - 5 gallon air tank - Air line quick connects - AIR HORNS!
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post #2 of 5 Old 10-14-2010, 11:21 AM
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Is your trans loose? or motor mounts? causing it every now and then to rock into the body?

1993 f-350 7.3IDI
1967 F-100 352
1958 Pan Head Ground up built NOT BOUGHT
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post #3 of 5 Old 10-14-2010, 11:58 AM Thread Starter
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I did check the engine mounts and they are ok. But for some reason I didn't think about the transmission mount. I'll check that one out next. Thanks!

Jason

O.T.F.D. Volunteer 19

Great White - 2003 7.3l F-250 4x4 CCSB -102,000 miles and tickin
DIY intake - 4" Straight pipe - HPX - CAT ELC - 203° t stat - billet t stat housing - coolant filter - dual alt radiator hose - 12V Air compressor - 5 gallon air tank - Air line quick connects - AIR HORNS!
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post #4 of 5 Old 10-14-2010, 12:05 PM
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Also I see your sig says 4x4 check your axle from the transfer case and the transfer case itself. anything that could move on a decent start.

1993 f-350 7.3IDI
1967 F-100 352
1958 Pan Head Ground up built NOT BOUGHT
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post #5 of 5 Old 10-14-2010, 12:44 PM
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mine does that occasionally - I think it's the vacuum pump doing it

Ben

earlybird with:
DIY 6637 intake filter
MBRP 4" exhaust w/5" tip
Cab Lights
DIY exhaust brake
on board air compressor & tank


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