• The site migration is complete! Hopefully everything transferred properly from the multiple decades old software we were using before. If you notice any issues please let me know, thanks! Also, I'm still working on things like chatbox, etc so hopefully those will be working in the next week or two.

fuel pressure is 40 at idle.....

A

alivepills

New member
so when i turn my key and the fuel pump engages it reads 43 and then when i start it, it idles at 40. i know its supposed to be 48-55, then a 3-10psi drop at idle. is this enough to mess things up? i am having issues when hittin the gas goin up a hill or just tryin to get on it. ive narrowed it down to preatty much a cat or low fuel pressure. what should i do first? maybe get a voltage booster and hi flow fuel filter first? then just eliminate the cat and get an emulator?
 


When was the last time you changed plugs and wires. I had a bad set of wires causing me all kinds of problems. Namely a nasty misfire but only under boost. Just a thought
 
High flow filters are a scam. Leave the gauge hooked up and drive and see what it is while driving if it drops below 40 change the filter and if it still does time for a new pump
 
damn. when i drive what rpm should i reach. i just got a cheap rented autozone gauge so i dunno how well i could read it while driving.and i got plugs and just replaced wires a week ago and it runs a hell a lot better but still stutters. what is the misefireing/tach jumping? is that kr? or somethin else. what about the voltage booster? that is suposed to giv the fp more juice and raise psi? would that really give me a few psi?
 


seafoam wont screw up my injectors? wtf. anyways... i didnt know that you were suposed to dissconnect the vac line to get the correct fuel pressure reading... are you sure?
 
Disconnecting the vacuum line just tells you that the regulator is adjusting in relation to maifold pressure. 43.5psi @0 vacuum is what it should be, and around 37psi with vacuum hose connected, depending on idle vacuum.
 
QUICKSILVER462 said:
Disconnecting the vacuum line just tells you that the regulator is adjusting in relation to maifold pressure. 43.5psi @0 vacuum is what it should be, and around 37psi with vacuum hose connected, depending on idle vacuum.
Click to expand...


37 is low. 42 is where you want to be under vaccum and around 48-50ish with no vacuum, and yeah you're supposed to go off the non vacuum numbers.
 
this stumble that i thought was an engine misfire for the longest time turned out to be in my tranny. my car would accelerate through the stumble if i taped the brakes while still giving it gas. leading me to believe it was the torque converter lockout solinoid. kind of a pain in the ass. but readin on here some ppl told me to just disconnect my battery to reset my pcm, because it might be the pcm messin everything up. well that turned out to work perfectly. now my question is with the pcm . do i need to replace this to prevent this from happening again? and what brand pcm will work best for me? i dont plan on any big mods just exhaust and some minor stuff.
 


You must log in or register to reply here.
Back
Top