Can't boost over 5-6psi PLEASE HELP

[dominoy2k1]

the stock fpr should have no vacuum. like i said thats assuming that an fmu is hooked up similar to and afpr. if it is connected thats why you run lean. not enough pressure i would assume.

 

[FrigginGLI]

It should go rich on protege's. My guess you are not getting enough fuel to supply the power.

 

[dominoy2k1]

how many miles on stock pump? how much fuel in tank?

 

[Matthew]

how many miles on stock pump? how much fuel in tank?

tank is full...pump has same amount as my car = about 13500 miles.

 

[Matthew]

the stock fpr should have no vacuum. like i said thats assuming that an fmu is hooked up similar to and afpr. if it is connected thats why you run lean. not enough pressure i would assume.

pictures in the instructions show it still hooked up.

 

[dominoy2k1]

does the fmu run off the fuel feed line or return line?

 

[Matthew]

return

 

[Matthew]

bump (i will be bumping the s*** out of this thread until my car is fixed.)

 

[azian6er]

you sure the 02 modifier is hooked up right? Did you check that it is getting power? Do you have a volt meter? I would check the power source to the o2 modifier and make sure it is powered. Honestly it has to be that or the FMU and associated hardware (vacuum lines etc).

i suggest getting yourself a volt meter and making sure that 02 modifier is getting power and is hooked up securely and all connections are either solders or connected firmly.

Also, if all lines going to the FMU are correct, all your wiring is done right, and everything else was followed and installed correctly, then the FMU is bad. I would suggest if everything is correct in regard to the wiring and routing of vacuum lines to and from the FMU get another FMU and try it out.

Check that the 02 modifier is getting voltage and that voltage is going through it. Is this a new 02 modifer or is it used?

it has to be either of those things.

-B

 

[Matthew]

are you talking about mil eliminator or voltage clamp? if youre talking about mil eliminator its been working for almost a year with no problems. if youre talking about the voltage clamp it clicks on everytime i go into boost and clicks off everytime i go out of boost. i dont have a volt meter and im not sure what wires to check if i did have one.

the modifier was brand new in the package.

 

[Bigg Tim]

How about taking the FMU and see if it still does it.

 

[Matthew]

what is the o2 modifier? the voltage clamp or the mil eliminator?

if i take out the FMU of COURSE im going to run lean.

and there isnt enough room for me to get in the engine bay with a hacksaw to cut off the jb welded end of the egr valve.

 

[Bigg Tim]

Sorry I had to edit the last post, you're quick! The O2 modifier I am talking about is the FM voltage clamp thing.

 

[Matthew]

the problem is, if i take either of those things out its going to run lean no matter what so it wont solve anything.

yes im desperate and im hitting refresh as fast as i can to see what people have to say.

 

[Matthew]

i shouldnt need a fuel pump to boost 5 damn lbs right? and if the clamp is kicking on and off that shouldnt be the problem either...

i wish i had a wideband af guage but i cant afford them right now...im wondering if the AF is wrong and im really not running rich....but its too risky to just say **** it and drive on.

 

[azian6er]

are you talking about mil eliminator or voltage clamp? if youre talking about mil eliminator its been working for almost a year with no problems. if youre talking about the voltage clamp it clicks on everytime i go into boost and clicks off everytime i go out of boost. i dont have a volt meter and im not sure what wires to check if i did have one.

the modifier was brand new in the package.

yeah i was talking about the voltage clamp (02 signal modifier) same thing.

if it is clicking then it should be working. And if it was new then im sure it is fine.

My best guess is that either the vacuum lines to the fmu are incorrect, the fmu itself is bad, OR..

where did you splice your af gauge signal wire at? If it is at the ecu then i thik that is your problem. When using the mil eliminator you can no longer rely on the signal from the ecu for your a/f reading. (this is what i have been told, i dont know if it is entirely correct)

Instead, splice the a/f ratio gauge wire at the first 02 sensor in the engine bay and not at the ecu. You maybe not running rich at all. It may just be your a/f gauge reading. This is why a WB02 would be nice, you wouldnt have to rely on a led telling you how rich you are.

CHeck the vacuum lines again and then maybe try to move the a/f gauge wire to the first 02 sensor in the engine bay rather than at the ecu.

I think this may be your issue.

-B

 

[Bigg Tim]

If you take out the voltage clamp, at WOT you will not be lean if the FMU is working properly. The voltage clamp modifies when closed loop goes to open loop, or something like that, so at WOT the voltage clamp is useless.

 

[Matthew]

yeah i was talking about the voltage clamp (02 signal modifier) same thing.

if it is clicking then it should be working. And if it was new then im sure it is fine.

My best guess is that either the vacuum lines to the fmu are incorrect, the fmu itself is bad, OR..

where did you splice your af gauge signal wire at? If it is at the ecu then i thik that is your problem. When using the mil eliminator you can no longer rely on the signal from the ecu for your a/f reading. (this is what i have been told, i dont know if it is entirely correct)

Instead, splice the a/f ratio gauge wire at the first 02 sensor in the engine bay and not at the ecu. You maybe not running rich at all. It may just be your a/f gauge reading. This is why a WB02 would be nice, you wouldnt have to rely on a led telling you how rich you are.

CHeck the vacuum lines again and then maybe try to move the a/f gauge wire to the first 02 sensor in the engine bay rather than at the ecu.

I think this may be your issue.

-B

ive already done this...thats the way i had it hooked up to begin with, on the first o2 sensor, connected to the blue wire.

how would the vacuum lines be incorrect? ive got the brake booster t'd off and running to the FMU, which is pretty straightforward...its got its own line, and its coming from the strongest vacuum source our cars have.

damn does anyone have a working FMU that they can send me to see if thats the problem?

 

[Matthew]

If you take out the voltage clamp, at WOT you will not be lean if the FMU is working properly. The voltage clamp modifies when closed loop goes to open loop, or something like that, so at WOT the voltage clamp is useless.

the way you troubleshoot that without taking out the voltage clamp is put the car in third gear and go to 4500rpm without getting into boost then flooring it...and it still goes lean as ****. coupled with the fact that the voltage clamp clicks on and off leads me to believe that its not the voltage clamp...something in the wiring, vacuum lines, or FMU is what im guessing. but there is no way to check the FMU.

 

[Matthew]

bump