This is topic Backfire, low power at idle. in forum Tech Talk at Northern California Ford Owners  .


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Posted by TonyToons707 (Member # 8105) on :
 
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!
 
Posted by norcalfiddy (Member # 11207) on :
 
check your fuel pump or filter.
 
Posted by 03blksnake (Member # 10974) on :
 
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
 
Posted by 9svt8' (Member # 11410) on :
 
quote:
Originally posted by norcalfiddy:
check your fuel pump or filter.
check fuel pressure at the fuel rails
 
Posted by 88FOX (Member # 9969) on :
 
Check your spark plug connections did you change them out one by one? Any possibility you might have messed up the firing order?
 
Posted by TonyToons707 (Member # 8105) on :
 
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.
 
Posted by TonyToons707 (Member # 8105) on :
 
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.
 
Posted by norcalfiddy (Member # 11207) on :
 
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.
 
Posted by gercolla1 (Member # 3068) on :
 
injector harness ground wire?
 
Posted by sneakyfox90 (Member # 9379) on :
 
make sure u put ur sparkplug wires back all in thes right spot

mis matched wires will cause the symtoms your describing!!
 
Posted by 9svt8' (Member # 11410) on :
 
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.
 
Posted by TonyToons707 (Member # 8105) on :
 
Well I have no cats period but Ill switch them and see what happeneds. Thank you all again I really appreciate the help.
 
Posted by TonyToons707 (Member # 8105) on :
 
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?
 
Posted by norcalfiddy (Member # 11207) on :
 
check the fuel pressure, pretty sure thats your problem.
 




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