[Dwayne]

Well, I just changed the fpr, and the car runs better already. I’m letting it sit for a while with pressure gauge hooked up, and I’m keeping my fingers crossed that the pressure is maintained, and it doesn’t all leak out

I will report back on my findings

[Dwayne]

[quote=”barneyb” post=109988]Clean engine compartment! Things are always changing but ordinarily the fpr samples vacuum in the manifold and adjusts fuel pressure to match changing manifold pressure. When it samples nothing why have the line? I guess we need somebody smarter than me here to explain it.[/quote]
barneyb
yes, engineers are always changing, reconfiguring to ensure efficiency, and performance

you are correct about the fpr pulling vacuum from the manifold:) but for what ever reason this one doesn’t…idk why it’s set up this way, but I will research it. I do know I can check the fpr several ways, but since this one is already leaking, I’ll just put a new one on, then continue with my troubleshooting.

I still can’t figure out the psi rise in the system during the time it all bled out that evening, and when I got home from work the next day, there was enough psi in the system to make me scratch my head a but. I feel like the pressure in the tank after sitting all day, and it being hot out, probably caused the pressure to come back up?

[Dwayne]

[quote=”barneyb” post=109988]Clean engine compartment! Things are always changing but ordinarily the fpr samples vacuum in the manifold and adjusts fuel pressure to match changing manifold pressure. When it samples nothing why have the line? I guess we need somebody smarter than me here to explain it.[/quote]
barneyb
yes, engineers are always changing, reconfiguring to ensure efficiency, and performance

you are correct about the fpr pulling vacuum from the manifold:) but for what ever reason this one doesn’t…idk why it’s set up this way, but I will research it. I do know I can check the fpr several ways, but since this one is already leaking, I’ll just put a new one on, then continue with my troubleshooting.

I still can’t figure out the psi rise in the system during the time it all bled out that evening, and when I got home from work the next day, there was enough psi in the system to make me scratch my head a but. I feel like the pressure in the tank after sitting all day, and it being hot out, probably caused the pressure to come back up?

[Dwayne]

[quote=”barneyb” post=109976]College man, what I am wondering about is the routing of the vacuum line to the fpr. The OP writes that it is connected to the intake boot. Well, where ever that is I’m wondering if it is correct.[/quote]
hi barneyb
the vacuum line to the fpr is routed correctly. The vacuum hose is on the intake boot, located between the air box that has the filter, and the plenum that goes over the TB. The engine also has the cop encapsulated inside the ignition module black box on top of the head

maybe I can find a pic and post it, here are two, note the fpr vacuum line on the intake boot just before the TB plenum that sits on top of the TB. In this configuration there is no vacuum in that line, the metered air just flows on by that line, weird! I will do some more research on why that vacuum line is even there, if it has no vacuum
[IMG]http://i494.photobucket.com/albums/rr310/buckz6319/2003_Pontiac_Sunfire_Ecotec_zpse1ea6e70.jpg[/IMG]
[IMG]http://i494.photobucket.com/albums/rr310/buckz6319/maxresdefault_zps8f25c5b6.jpg[/IMG]

[Dwayne]

[quote=”barneyb” post=109976]College man, what I am wondering about is the routing of the vacuum line to the fpr. The OP writes that it is connected to the intake boot. Well, where ever that is I’m wondering if it is correct.[/quote]
hi barneyb
the vacuum line to the fpr is routed correctly. The vacuum hose is on the intake boot, located between the air box that has the filter, and the plenum that goes over the TB. The engine also has the cop encapsulated inside the ignition module black box on top of the head

maybe I can find a pic and post it, here are two, note the fpr vacuum line on the intake boot just before the TB plenum that sits on top of the TB. In this configuration there is no vacuum in that line, the metered air just flows on by that line, weird! I will do some more research on why that vacuum line is even there, if it has no vacuum
[IMG]http://i494.photobucket.com/albums/rr310/buckz6319/2003_Pontiac_Sunfire_Ecotec_zpse1ea6e70.jpg[/IMG]
[IMG]http://i494.photobucket.com/albums/rr310/buckz6319/maxresdefault_zps8f25c5b6.jpg[/IMG]

[Dwayne]

[quote=”college man” post=109961]Welcome to the forum and enjoy. :)[/quote]
thanks! and I’m sure I will 🙂

[Dwayne]

[quote=”college man” post=109961]Welcome to the forum and enjoy. :)[/quote]
thanks! and I’m sure I will 🙂

[Dwayne]

Yes, and I was going to throw a vacuum gauge on the engine, however I’ll do that after I replace the fpr

[Dwayne]

Yes, and I was going to throw a vacuum gauge on the engine, however I’ll do that after I replace the fpr

[Dwayne]

thanks Lol. I know I get excited when I join a forum that has folks like me hanging out:) at age 51 I still get excited about working on stuff…

[Dwayne]

thanks Lol. I know I get excited when I join a forum that has folks like me hanging out:) at age 51 I still get excited about working on stuff…

[Author]

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