Hi can someone tell me what would be approx. normal fuel pressure psi points roughly.
Like let's say you have 39 psi no vacuum. Then wish vacuum hooked up it should drop, to about what??? So when I rev the engine up to let's say 2500rpm what should my fuel pressure change to? Cause mine drop's to about 25 psi.
Have been getting code 96 engine off, but can start the car up fine, drive around the block, seems more sluggish than it should be especially at low rpm, can get it going at about 2500 with a slight bit of poping/firing in the exhaust, kinda feels like it bogs a bit, get's kinda like jumpy, not sure the right word, but say when accelerating kinda does the thing where its trying but isn't really smooth kinda struggles but does seem to manage when up there a bit. Was getting to lean then to rich codes, especially when I played with the regulator. Codes I have seen are engine off 96, first engine on 41 and 91, switched both o2's and got just 41. Have 4 o2's in total so can switch through them to find 2 good ones. Anyways after swapping through a bunch of o2's and still getting 91, thought I would up the fuel pressure a bit. Got code 92. But with very slight psi adjustments like 2psi here or there.
So tommorrow I am going to swap my stock fuel pump out for a 190 lph fuel pump, swap the fuel filter. Then will jumper the fuel test circuit key on engine off to get 39 psi with no vacuum. Then I will check with the engine running vacuum off that I am maintaining 39 psi. Will shut it off and reconnect vacuum. Dump engine running codes, take it for a spin, then check error codes. Then if I get 41 or 91, I will swap whatever code side 41right 91left o2 sensor out, dump codes again and take it for another spin. If I come back and still have error codes I am completely lost. Other last thing I will try, and if I am getting engine lean or rich, after all the above is to re-adjust the fuel pressure regulator by approx. 2psi in the opposite direction of the error code from my starting point. Eg. if I get 92, to rich I will lean it out by dropping my fuel pressure to 37psi., and if I get another to lean, I will bump my fuel pressure up to 41 psi. Other than this I am absolutely lost in every way!
If you think I am on the right path with swapping out the fuel pump and fuel filter than I hope your right! But if after all of the above, if there is anything you guys can do to help me that would be great! Because if this doesn't work I really don't know what else I can try! Thanks guys!!!!!
Like let's say you have 39 psi no vacuum. Then wish vacuum hooked up it should drop, to about what??? So when I rev the engine up to let's say 2500rpm what should my fuel pressure change to? Cause mine drop's to about 25 psi.
Have been getting code 96 engine off, but can start the car up fine, drive around the block, seems more sluggish than it should be especially at low rpm, can get it going at about 2500 with a slight bit of poping/firing in the exhaust, kinda feels like it bogs a bit, get's kinda like jumpy, not sure the right word, but say when accelerating kinda does the thing where its trying but isn't really smooth kinda struggles but does seem to manage when up there a bit. Was getting to lean then to rich codes, especially when I played with the regulator. Codes I have seen are engine off 96, first engine on 41 and 91, switched both o2's and got just 41. Have 4 o2's in total so can switch through them to find 2 good ones. Anyways after swapping through a bunch of o2's and still getting 91, thought I would up the fuel pressure a bit. Got code 92. But with very slight psi adjustments like 2psi here or there.
So tommorrow I am going to swap my stock fuel pump out for a 190 lph fuel pump, swap the fuel filter. Then will jumper the fuel test circuit key on engine off to get 39 psi with no vacuum. Then I will check with the engine running vacuum off that I am maintaining 39 psi. Will shut it off and reconnect vacuum. Dump engine running codes, take it for a spin, then check error codes. Then if I get 41 or 91, I will swap whatever code side 41right 91left o2 sensor out, dump codes again and take it for another spin. If I come back and still have error codes I am completely lost. Other last thing I will try, and if I am getting engine lean or rich, after all the above is to re-adjust the fuel pressure regulator by approx. 2psi in the opposite direction of the error code from my starting point. Eg. if I get 92, to rich I will lean it out by dropping my fuel pressure to 37psi., and if I get another to lean, I will bump my fuel pressure up to 41 psi. Other than this I am absolutely lost in every way!
If you think I am on the right path with swapping out the fuel pump and fuel filter than I hope your right! But if after all of the above, if there is anything you guys can do to help me that would be great! Because if this doesn't work I really don't know what else I can try! Thanks guys!!!!!
