3800 narrowing down the problem....

[zeez gtp]

i have come to the conclusion that something is wrong with my fuel injectors. my car has been running real rough lately. i decided to go and buy some stp fuel injector cleaner and give it a shot. i mean it's only 3 bucks anyways, after the second day it was in there, my car started up real nice everytime. when my tank of gas ran out, and i filled it back up. the car would start real rough. i am guessin my fuel injectors are extremely dirty. under boost, my car still boggs. but i have not yet thrown an ses light yet. i am not boosting my car either, sometime i have to get on it just a tad to switch lanes or something. do you think i just need them cleaned? what does it mean by injectors going static? i know someone said something about a leak in a vacuum line. i don't know if that has anything to do with it, but on my boost gauge on the vaccum side, at idle, it is at 20. is that normal. that's how it has always been. if i have a leak in the vaccum line, will it read differently? thanks for the help

Zack

oh ya, my car has almost 105k miles on it

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[imported_Ron Vogel]

Ditch the STP and get some Chevron Techron. It works real well to clean up the injectors and carbon deposits. GM dealerships even sell it under their own name now.

 

[xttc2000]

20 in hg vacum is normal.

static injectors means your pulsewidths are over 22ish and spraying pretty much constantly.

whats your fuel pressure?

 

[beyerch]

hrm... I'd actually say fuel pump or fuel filter..... change the filter.

 

[xttc2000]

i agree with charles, definitely change the filter, even if thats not the cause of the problem- people tend to not change them enough.

 

[zeez gtp]

where is the filter located. haha, obviously i haven't changed it. i doubt it has eve been changed before.

 

[dole21]

under the car just in front of the driver side rear wheel.



i used a flare nut wrench to get mine off.

 

[Royalgtp]

filter...........

That should do it.

You need abig ass wrench to do the job...its not a standard on that you get in most mechanic tool sets...

 

[zeez gtp]

cool, thanks. when i take it off, will gas be leaking out. i am just wondering, that way i know what to expect.

 

[Adam86]

you should depressurise (sp?) the fuel system first. there is a schrader valve in the engine (ontop of the fuel rail in front) with a little black twist off top on it. twist it off, depress the valve with a screwdriver or something and cover it with a bunch of paper towels because gas will begin to come out. you'll know when its depressurised because gas and air will stop coming out. a little bit of fuel will still leak out of the filter itself though (probably a cup or so) so have something ready to let it leak into, or just let it leak all over the garage floor. h34r:

 

[xttc2000]

go under the car, there is a plug that goes into the fuel pump. its right there by your mufler. unplug that and run the car, itll die and then the fuel lines will all be dry.

or you can just change it with fuel in the lines and get a little wet and wash your hands after.

 

[SnM]

or you can unplug the fule pump fuse in the fuse box under the hood, and then run the car till it dies.

i soaked the area with pb blaster (any lube will be almost as good, wd-40...) before trying to use the wrenches. i just used two adjustable wrenches when i did it. the other side of the filter just snaps off. wish both sides were like that.

 

[zeez gtp]

thanks for the help. is it bad to run the car until it dies cause of no fuel? i'm just curious.

 

[zeez gtp]

well, i couldn't get the fuel filter off. the nut was so rusted on there i couldn't get it. even my dad came out and gave it a try. we wd-40ed the thing to death. nothing. we still tried but we just rounded the nut. i am going to take it to a local mechanic shop by my house and let them worry about it. it's just aggravating.

 

[dole21]

PB blaster...way better than wd-40...I bought a can at autozone.

try a flare nut wrench on it...mine was a bitch too until i got that.

 

[zeez gtp]

i did get a flare nut wrench. went and bought a set last night for the stupid fuel filter. haha. well, the nut is rounded now, so i can't do to much about it. haha. it's all good

 

[Royalgtp]

its probley nota good sign that its on like a mofo......its probley the stocker!

Good luck.

 

[zeez gtp]

i will agree 100% with you, that it is probably the stocker

 

[SnM]

how many miles on your car?

 

[zeez gtp]

just about 105,000

 

[SnM]

yeah, that would be hard to get off if it is the original....