Possible fuel pump going bad?
09-29-2009, 07:36 PM
#41
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The only reason im going to go against it being the pump is that when mine went out, like i said, it still ran fine on 25psi. No stumbles, nothing.
09-29-2009, 07:42 PM
#42
Im doing msd plug wires this weekend, so if its still acting up after a new pump and wires, then the opti is getting replaced. But whats with the low fuel pressure? Could be the injectors like mentioned?
09-29-2009, 07:53 PM
#43
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Thats what was wrong with mine, the hose had a hole in it going from pump to hardlines. So basically it was working like a dog and only putting out so much cause it was leaking back into the tank before it could get to the line.
Im pretty sure im dealing with a opti issue currently with my car too if that makes you feel any better
09-29-2009, 10:09 PM
#46
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from this post it sounds very simular to my brothers problem. he is Alexz28 on this website. you could look up some of his post. but his car gose to 4500 then it stutters, backfires, and loses power and wont go any higher than that. his car was on a wideband dyno and his air and fuel was fine. on his car its the opti or cap n rotor. he will probably be swaping it out this weekend and ill let you know if it fixes it. your problem sounds like you have a weak pump but I dont think its weak enouph to cause your car from not going any higher then 3500rpm sence when you pulled the vacume it shot up to 48psi, witch tells me the pump is still prity strong. I personaly think its your cap n rotor or opti and wish you best of luck on solving your problem.
09-29-2009, 10:13 PM
#47
from this post it sounds very simular to my brothers problem. he is Alexz28 on this website. you could look up some of his post. but his car gose to 4500 then it stutters, backfires, and loses power and wont go any higher than that. his car was on a wideband dyno and his air and fuel was fine. on his car its the opti or cap n rotor. he will probably be swaping it out this weekend and ill let you know if it fixes it. your problem sounds like you have a weak pump but I dont think its weak enouph to cause your car from not going any higher then 3500rpm sence when you pulled the vacume it shot up to 48psi, witch tells me the pump is still prity strong. I personaly think its your cap n rotor or opti and wish you best of luck on solving your problem.
Need to remove the pulley and other crap? If so im better off just replacing the whole thing.
09-29-2009, 10:20 PM
#48
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cap and rotor is the same as an opti change. yup remove the pulley and crap. ya if it was me id just replace the whole thing and be done w/ it. actully im changing the opti on my car tomorrow or this weekend but mine is the optical sensor in the opti that is failing and making my car shut off while driving.
