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Author Topic:   351W backfiring questions

Posts: 1
From: Salinas, CA
Registered: Apr 2004

posted 04-26-2004 07:06 PM     Click Here to See the Profile for soneal   Click Here to Email soneal     Edit/Delete Message   Reply w/Quote
My 351w is having backfiring problems (up thru the carb.) when I accelerate quickly but not when I accelerate slowly.Can anyone suggest what the problem may be?

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Posts: 43790
From: Saco, Maine
Registered: May 99

posted 04-26-2004 07:22 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
Assuming there are no vacuum leaks, you have an accelerator pump failure or maladjusted.

'70 Mustang Mach 1 351C 4V/FMX/3.25 Open
'70 Mustang Convertible 250 I6/3 speed/2.79 Open
'72 Mustang Sprint Hardtop 351C 4V/FMX/4.30 Trac Loc
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip

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Posts: 6
From: NJ,USA
Registered: May 2004

posted 05-11-2004 02:32 PM     Click Here to See the Profile for NJfourwheeler   Click Here to Email NJfourwheeler     Edit/Delete Message   Reply w/Quote
Firing order? 351W and 302HO are the same, all other 302/289 are different.

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Posts: 290
From: New Cumberland,WV
Registered: May 2001

posted 05-11-2004 10:20 PM     Click Here to See the Profile for wvcat   Click Here to Email wvcat     Edit/Delete Message   Reply w/Quote
Sounds like the vacumn advance could be stuck. pull the distributor cap off and see if the breaker plate will move freely. Could be a timing issue also.

70 XR7 Restomod...wvcat
66 coupe project...she needs a name!!!

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