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Author
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Topic: Backfire, low power at idle.
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30Tunes
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Member # 8105
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posted
 
 
Just changed the plugs, coils looked good from last tune up. The car seems to be backfiring and sputtering at low rpms. Whenever I come to a stop and start going again it will sputter and or backfire. I can put the pedal to the floor and it wont go anywhere. Any help is appreciated. Seems like this all started after I put new o2 sensors in. All help is welcome, thank you!
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SUCCESS ONLY COMES BEFORE WORK IN THE DICTIONARY
1991 Calypso Green Notch
1993 Cobra Clone - SOLD
Posts: 829 | From: Bay Area | Registered: Dec 2007
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norcalfiddy
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Member # 11207
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posted
check your fuel pump or filter.
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600HP 1996 7.3L powerstroke single cab short bed race truck
Posts: 3393 | From: Brentwood | Registered: Aug 2011
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03blksnake
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Member # 10974
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posted
might be a long shoot but i seen it happen before after my buddy put in his new o2s the connections started rubbing against his exaust and got burnt and had the same problem i would just take a 2nd look down there could have even unplugged as well
Posts: 138 | From: bay area | Registered: May 2011
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9svt8'
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Member # 11410
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posted
quote:
Originally posted by norcalfiddy:
check your fuel pump or filter.
check fuel pressure at the fuel rails
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96' gt - totaled
98' cobra
ROYAL EMPIRE
Posts: 192 | From: San Jose | Registered: Nov 2011
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88FOX
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Member # 9969
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posted
Check your spark plug connections did you change them out one by one? Any possibility you might have messed up the firing order?
Posts: 1938 | From: bay area | Registered: Apr 2010
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30Tunes
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Member # 8105
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posted
Just changed fuel filter, fuel pump seems to be operating fine. I can hear it turn on when I turn the key. The o2s are brand new, I checked the routing I did and its perfectly fine. I'm thinking I need to check my timing. Also, I only changed the plugs not the coils. They should be fine, its just weird it only does it if I'm going slow?? Any more suggestions? I'll check the fuel pressure and post the results.
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SUCCESS ONLY COMES BEFORE WORK IN THE DICTIONARY
1991 Calypso Green Notch
1993 Cobra Clone - SOLD
Posts: 829 | From: Bay Area | Registered: Dec 2007
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30Tunes
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Member # 8105
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posted
Also, does it matter which o2 is plugged to which connection? Like is there a certain one for the right side and left? Or are they both the same.
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SUCCESS ONLY COMES BEFORE WORK IN THE DICTIONARY
1991 Calypso Green Notch
1993 Cobra Clone - SOLD
Posts: 829 | From: Bay Area | Registered: Dec 2007
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norcalfiddy
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Member # 11207
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posted
quote:
Originally posted by TonyToons707:
Just changed fuel filter, fuel pump seems to be operating fine. I can hear it turn on when I turn the key. The o2s are brand new, I checked the routing I did and its perfectly fine. I'm thinking I need to check my timing. Also, I only changed the plugs not the coils. They should be fine, its just weird it only does it if I'm going slow?? Any more suggestions? I'll check the fuel pressure and post the results.
some fuel pumps will still make a noise, even when there bad.
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600HP 1996 7.3L powerstroke single cab short bed race truck
Posts: 3393 | From: Brentwood | Registered: Aug 2011
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gercolla1
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Member # 3068
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posted
injector harness ground wire?
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Sf Bay Area
Posts: 2171 | From: Sampan San Francisco | Registered: Jul 2003
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Saleen 00-768
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Member # 9379
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make sure u put ur sparkplug wires back all in thes right spot
mis matched wires will cause the symtoms your describing!!
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'00 Saleen SC #768
'90 GT
'90 California Edition (sold)
'87 Saleen #264 (sold)
Posts: 1664 | From: NOR✯CAL | Registered: Aug 2009
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9svt8'
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Member # 11410
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posted
quote:
Originally posted by TonyToons707:
Also, does it matter which o2 is plugged to which connection? Like is there a certain one for the right side and left? Or are they both the same.
Yes. Someone correct me if I'm wrong, One is a pre cat reading and one is an after cat reading so if they are backwards the readings will be backwards as well.
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96' gt - totaled
98' cobra
ROYAL EMPIRE
Posts: 192 | From: San Jose | Registered: Nov 2011
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30Tunes
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Member # 8105
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posted
Well I have no cats period but Ill switch them and see what happeneds. Thank you all again I really appreciate the help.
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SUCCESS ONLY COMES BEFORE WORK IN THE DICTIONARY
1991 Calypso Green Notch
1993 Cobra Clone - SOLD
Posts: 829 | From: Bay Area | Registered: Dec 2007
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30Tunes
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Member # 8105
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posted
called one of my buddies on here about the significance of putting the plugs in the right connection. He says there is no specific side for the plugs. Just plug and go for the o2s. Anyone else have a 2nd opinion?
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SUCCESS ONLY COMES BEFORE WORK IN THE DICTIONARY
1991 Calypso Green Notch
1993 Cobra Clone - SOLD
Posts: 829 | From: Bay Area | Registered: Dec 2007
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norcalfiddy
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Member # 11207
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posted
check the fuel pressure, pretty sure thats your problem.
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600HP 1996 7.3L powerstroke single cab short bed race truck
Posts: 3393 | From: Brentwood | Registered: Aug 2011
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