This is topic Need Help......Back Firing in forum Tech Talk at Northern California Ford Owners  .


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Posted by Night Ryder (Member # 912) on :
 
I notice when I shift at high RPM's my car back fires what causes this to happen?I had a fuel pressure regulator installed and it still back fires.I have a 2000 GT motor with some bolt ons.
 
Posted by rob (Member # 50) on :
 
you may be running too lean/rich, or have an exhaust leak...

[ January 06, 2003, 10:45 AM: Message edited by: rob ]
 
Posted by Black94 5.0 (Member # 655) on :
 
Whats your fuel pressure?..Do you have a timming adjuster?..Any exhaust leaks will make your car backfire..My car used to do that all the time..As soon as I took off my smog pump it cured the problem [Confused] (I probably had a bad diverter valve on the smog hoses)...
 
Posted by rob (Member # 50) on :
 
did you put the vacuum line back on the fuel pressure regulator?
check pressure with the vacuum line off, then make sure it is replaced before driving the car.
 
Posted by Night Ryder (Member # 912) on :
 
I don't think I have an exhaust leak I checked it already plus I had someone else look at it.The fuel pressure is set at I beleive 41 or 42psi.The vacuum hose is connected.If the car is running to rich or too lean what can I do to fix it?
 
Posted by Black94 5.0 (Member # 655) on :
 
Disconnect the vacuum line to the FPR and plug it, then check the fuel pressure guage.....Try starting off a little leaner at 39 psi(assuming you have stock timming)...See if that helps..If you start hearing detonation up the fuel pressure a couple psi......The best way to see if you're runnig rich or lean is to check your spark plugs..(white=lean)&(dark with carbon deposits)...Hope I could help..
 
Posted by Night Ryder (Member # 912) on :
 
Thanks guy's for the help [patriot]
 




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