WG 4.7 running fuel pressure questions. Vid to analyze
A weekend away camping was ruined.
Didn't make it to halfway point and had to limp back home.
The Grand Cherro just lost all its power. Floor it and it would die. Since we were fully loaded with trailer etc... there were lots of hills and curves on the journey I called it, and went back.
I changed the plugs with new Champions, the oldies looked like the originals 125,000km old?
New airfilter, cleaned sensor in the throttle body.
Thouroughly tested the TPS. Could not get it to fail. I think. Lol
Didn't change anything
Starts awesome, idles smooth, runs well until you mash the accelerator.
So I asssume it's starving for fuel.
Hooked up that Torque app, with the blue tooth obd2 connector, and fuel pressure gauge.
See vid. It idles at 50+ psi, but when you jam the throttle open it dies and holds at 3000 rpm but the fuels pressure drops to 12psi and then goes up to 18psi.
Thats bad yes? Should hold 50psi no? I can't find confirmation tonight on what it is supposed to stay on when wide open throttle.
Can anyone in here confirm it shoud not go below 45psi odd?
If so new fuel filter/reg is going in.
Thanks
__________________
Either write something worth reading or do something worth writing.
before you start to buy anything for fuel (or place the blame on) did you by any chance check the MAP (or some know as MAF) sensor ?
you know that funny little thing with the three wires that is near impossible to reach without removing the AC or ALT . sometimes those wires can loose contact and cause play up ,
and have you checked the breather/s pipe ?
and PCV ? may as well while your there right ?
before you start to buy anything for fuel (or place the blame on) did you by any chance check the MAP (or some know as MAF) sensor ?
you know that funny little thing with the three wires that is near impossible to reach without removing the AC or ALT . sometimes those wires can loose contact and cause play up ,
and have you checked the breather/s pipe ?
and PCV ? may as well while your there right ?
I've not done any of those yet, but will do so, given some time one night this week.
I'm going through everything I can, as part of a total service
It shouldn't drop down to 18psi like that bleetingblurters should it?
__________________
Either write something worth reading or do something worth writing.
here is a cut from another forum , it seems TPS can be a cause but if you checked correctly the voltage then check the wires connector , here is the quote :
My best guess without looking at it, and hooking up a scan tool would be the tps circuit. Try unplugging the tps harness and check for any corrosion or broken wires at the connector. If it was me I would probably take the plung and toss a tps in it.
Now that I think about it....my wifes wj had an issue with the tps several years ago, hesitated and didn't want to rev up. I probed it with a multi meter and the voltage readings were way off. Replaced it and haven't had a problem since. It never set a check engine light.
under a quick rev .....maybe , but did you try slow constant to see ?
try a slow rev up to the mark of the first test you did see what it reads ,
did you do a error check ?
see if anything is in pending or recorded .
here is a cut from another forum , it seems TPS can be a cause but if you checked correctly the voltage then check the wires connector , here is the quote :
My best guess without looking at it, and hooking up a scan tool would be the tps circuit. Try unplugging the tps harness and check for any corrosion or broken wires at the connector. If it was me I would probably take the plung and toss a tps in it.
Now that I think about it....my wifes wj had an issue with the tps several years ago, hesitated and didn't want to rev up. I probed it with a multi meter and the voltage readings were way off. Replaced it and haven't had a problem since. It never set a check engine light.
I went over the tps 5 times. Could not get it to falter.
I was thinking that it was high up on the list of causes too.
Constant 5v going into the first terminal.
Always accurate readings upto 4.5v dependant on throttle opening.
Never got any positive voltage reading from the earth.
Took it out. Went over it.
Put it back in.
Retested it about 5 times.
Not once did it play up.
Scan tool sees it keep working correctly too, even when it's bogging down.
I don't think it's the problem. Lol..
No guarantee though
__________________
Either write something worth reading or do something worth writing.
under a quick rev .....maybe , but did you try slow constant to see ?
try a slow rev up to the mark of the first test you did see what it reads ,
did you do a error check ?
see if anything is in pending or recorded .
Did u see the video bleets?
When the pressure drops and stays on 18psi I have the throttle wide open, it won't rev past 3000rpm.
When I creep the throttle up slowly it still won't rev over 3000rpm, and the fuel pressure slowly drops off proportional to the revs dropping off.
AJOR does not vouch for or warrant the accuracy, completeness
or usefulness of any message, and are not responsible for the contents of any
message. The messages express the views of the author of the message, not necessarily
the views of AJOR or any entity associated with AJOR, nor should any advice
be substituted as technical advice replacing that of a mechanic. You agree,
through your use of this service, that you will not use AJOR to post any material
which is knowingly false and/or defamatory, inaccurate, abusive, vulgar, hateful,
harassing, obscene, profane, sexually oriented, threatening, invasive of a person's
privacy, religious, political or otherwise violative of any law. You agree not to post any copyrighted
material unless the copyright is owned by you or by AJOR. The owner, administrators
and moderators of AJOR reserve the right to delete any message or members for
any or no reason whatsoever. You remain solely responsible for the content of
your messages, and you agree to indemnify and hold harmless AJOR, the administrators,
moderators, and their agents with respect to any claim based upon transmission
of your message(s). The use of profile signatures to intentionally mislead or misdirect any member on this forum is not acceptable and may result in your account being suspended. Any trip that is organised through the AJOR forum is participated
at your own risk. If you or your vehicle is damaged it is your responsibility,
not that of the person that posted the thread, message or topic initiating the
trip, nor the organisers of AJOR or moderators of any specific forum. This forum
and associated website is the property of AJOR. No user data is harvested and no information supplied in your registration will be sold for profit.
Black Panther
Dexter
WG 4.7 running fuel pressure questions. Vid to analyze
125,000km old?
