fuel pressure ?
Posted 10 April 2012 - 02:51 PM
Posted 11 April 2012 - 08:56 AM
Have you changed your fuel filter? I change mine every 10K miles.
Also, bad spark plug and or spark plug coil can cause misfires - are you getting any check engine lights/codes?
Edited by 2007_Shelby_GT, 11 April 2012 - 08:58 AM.
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Posted 11 April 2012 - 09:11 AM
A Port Injected EFI/PFI system is a High Pressure system and runs up to as much as 100psi.
If you used to see 70psi and you're only seeing 40psi now...You have a problem.
Like the other poster said, check your fuel filter first. If you can't blow through it, it's bad. Replace it and see if your FP comes back. If you can blow through it, it's not RESTRICTED (although it may still be "bad", as in dirty).
If it's not your filter, it's most likely a fuel pump problem or fuel pump supply (voltage) problem.
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Posted 11 April 2012 - 11:15 AM
I would try the fuel filter first since it's relatively cheap and easy.
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