) I left the ign on all night. So I take out the battery and charge it. Put it in, car fires up like never before, I guess the battery was in need of a charge anyways. But the thing is, now the car idles waay fast, like 2200 RPM. I check all the suspect air leaks, no luck.....try to see if it would respond to idle adjustment.....nada. Checked the fuel pressure while idling....waay too high, around 55 PSI. Now, with the exception of the high idle, the car runs fine! Can anybody clue me in on what could possibly be happening here!!Way fast idle
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Longbeach412
- Posts: 308
- Joined: Thu Aug 19, 2004 6:34 am
Way fast idle
Another wierd saga with this Ljet 1.8 of mine. While busy testing the sending unit (my other post ) I left the ign on all night. So I take out the battery and charge it. Put it in, car fires up like never before, I guess the battery was in need of a charge anyways. But the thing is, now the car idles waay fast, like 2200 RPM. I check all the suspect air leaks, no luck.....try to see if it would respond to idle adjustment.....nada. Checked the fuel pressure while idling....waay too high, around 55 PSI. Now, with the exception of the high idle, the car runs fine! Can anybody clue me in on what could possibly be happening here!!
) I left the ign on all night. So I take out the battery and charge it. Put it in, car fires up like never before, I guess the battery was in need of a charge anyways. But the thing is, now the car idles waay fast, like 2200 RPM. I check all the suspect air leaks, no luck.....try to see if it would respond to idle adjustment.....nada. Checked the fuel pressure while idling....waay too high, around 55 PSI. Now, with the exception of the high idle, the car runs fine! Can anybody clue me in on what could possibly be happening here!!-
vwbill
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- Joined: Sat Feb 15, 2003 12:01 am
Rich mixture?
Hey, isnt the pressure suppose to be around 30lbs? I thought it was possible to burn the points if the ignition is left on too long? So what is the pressure at the fuel rail after it pressurizes? I wonder if something is leaking fuel from being under pressure?? So did the pressure change so maybe the fuel pressure regulator is leaking now? Maybe Ray or the Guys has a good idea? Sounds like a fuel rich situation kinda? Bill
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Longbeach412
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- Joined: Thu Aug 19, 2004 6:34 am
Yes, it should be 30 PSI.......55 PSI at idle is way high in my opinion. Funny thing is, the motor runs fine and, NO leaks.....amazing. You'd expect the fuel lines to be popping up like fireworks!.......I know that the points might be fried by now, but that shouldn't impact the fuel pressure or idle speed. And the motor starts fine 
I mean, isn't the fuel pressure supposed to stay constant at 30psi? What signals could possibly increase it by that much and keep it there? Maybe the press regulator got busted like Bill says, but why? ......man I sure am still in the dark with that Ljet crapola 
I mean, isn't the fuel pressure supposed to stay constant at 30psi? What signals could possibly increase it by that much and keep it there? Maybe the press regulator got busted like Bill says, but why? ......man I sure am still in the dark with that Ljet crapola -
MGVWfan
- Posts: 825
- Joined: Fri Jun 11, 2004 9:23 pm
I'm not sure if a volt or two would do this, but it is possible the fuel pump motor is running faster, causing stress on an already weak FP regulator...maybe it was OK with the flow rates at lower pump output. It sounds like a weak relationship to me, but I figured I'd mention it.
Also, since the L-Jet FP reg is vacuum controlled to a certain extent, and you've got high idle, maybe you've got a vacuum leak?
Also, since the L-Jet FP reg is vacuum controlled to a certain extent, and you've got high idle, maybe you've got a vacuum leak?
Lane
73 VW 412 (the Nomad, dropped valve seat land now, argh!)
67 MGB (Abingdon's Finest)
76 Plymouth Duster /6 (runs like a top)
99 New Beetle 2.0 (never gives any trouble)
04 Golf TDI (45 MPG)
09 JSW (love it, love it, love it!)
73 VW 412 (the Nomad, dropped valve seat land now, argh!)
67 MGB (Abingdon's Finest)
76 Plymouth Duster /6 (runs like a top)
99 New Beetle 2.0 (never gives any trouble)
04 Golf TDI (45 MPG)
09 JSW (love it, love it, love it!)
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vwbill
- Posts: 970
- Joined: Sat Feb 15, 2003 12:01 am
The books do say vacuum leak for fast idle!
It does say for fast idle in the books that its a vacuum leak or the aux air reg? I would try adjusting the fuel regulator to see if it changes the pressure down? Maybe get a spray bottle and do the line test for leaks.
Maybe Ray or someone has a better idea about the pressure change and how that and a vacuum leak might relate? Sorry Bill
Maybe Ray or someone has a better idea about the pressure change and how that and a vacuum leak might relate? Sorry Bill
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Longbeach412
- Posts: 308
- Joined: Thu Aug 19, 2004 6:34 am
I know that by now 
, so I did the spray thing off the bat and was a no go. I guess I'll do the spray bottle thing again with water this time and see if the RPMs drop. When you're idling at 2500 RPM, I guess its kinda tough getting any higher with a little extra hydrocarbon. will also change the press regulator (can't adjust, Ljet!) If that's a no go, am going to the mechanic, since Ray is not around much these days and I won't get scolded 
. Just kidden 
LOL!
, so I did the spray thing off the bat and was a no go. I guess I'll do the spray bottle thing again with water this time and see if the RPMs drop. When you're idling at 2500 RPM, I guess its kinda tough getting any higher with a little extra hydrocarbon. will also change the press regulator (can't adjust, Ljet!) If that's a no go, am going to the mechanic, since Ray is not around much these days and I won't get scolded . Just kidden LOL!-
vwbill
- Posts: 970
- Joined: Sat Feb 15, 2003 12:01 am
Damn! This is a good one!
So the Ljet Pressure regulator is vacuum adjusted(you check the line from the breather box for vacuum)? I wonder if you can put a Djet regulator in the line also to do adjustments? Is there a idle stablizer in the Ljet system? Need to get the Ray on this one! He would know the answer! Have you tried pinching off the aux air reg? What about pinching off lines to see if any change the idle? Did you check the timing again? This is a good one! We need to ask what could have changed from leaving the key on? What resistance could change this? Is it something you may have changed? What if you pull vacuum lines and plug them to see if any change? I wonder if you could be leaking in the vacuum can on the dist.? Sorry I'm not much help! I'll try doing some more reading! Bill
p.s.Hey did they use the Ljet on 74-77 buses? Maybe that could be a source of info? P.s.s. Hey did this happen along with the gas gauge trouble?
p.s.Hey did they use the Ljet on 74-77 buses? Maybe that could be a source of info? P.s.s. Hey did this happen along with the gas gauge trouble?
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Longbeach412
- Posts: 308
- Joined: Thu Aug 19, 2004 6:34 am
Mystry sloved!...well for the most part, and a tad stupid too. Turns out that the idle stabilizer gizmo, you know....that prong that keeps the idle from dipping too low for the auto tranny set up. That thing was stuck out.......don't ask me why!.......I just backed it up and she quitened down. But I still got the high fuel pressure, I'll take that on tomorrow.
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MGVWfan
- Posts: 825
- Joined: Fri Jun 11, 2004 9:23 pm
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vwbill
- Posts: 970
- Joined: Sat Feb 15, 2003 12:01 am
bus book
In the box book it says if the pressure is in excess of 35psi causes the diaphragm to deflect against spring tension, thereby uncovering a fuel outlet that returns excess fuel to the tank? Sounds like it might be bad?
Does the pressure change if you disconnect the vacuum line to the regulator? I wonder why it isnt moving the excess back to the tank? So the idle deal was the auto stablizer? bill
Does the pressure change if you disconnect the vacuum line to the regulator? I wonder why it isnt moving the excess back to the tank? So the idle deal was the auto stablizer? bill
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Longbeach412
- Posts: 308
- Joined: Thu Aug 19, 2004 6:34 am
Box book?.....dunno what that is but sure sounds interesting to get a hold of. Is it anywhere on line? .......and to answer the question about the gas gauge, yes .....I left the ign on while testing the sending unit......drained the battery.....charged the battery.......installed it and got the high idle and fuel pressure, or at least so it seems!
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vwbill
- Posts: 970
- Joined: Sat Feb 15, 2003 12:01 am
Bus Book,lol!
Sorry I meant VW Bus Book the green one! LOL! Bill
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raygreenwood
- Posts: 11912
- Joined: Wed Jan 22, 2003 12:01 am
Check for restrictions in the return line. Is this an L-jet fuel pump?
The pressure regulator will only cause pressure higher than it is design to....if it is restricted, (like a bent or clogged return) Has avastly larger pump than its design flow (like possibly a large CIS pump)....or if the diaphram is rusted so it is not releasing from the pressure orifice.
When vacuum is highest...pressure is lowest. When vacuum is lowest...pressure is highest. Check your throttle cable to make sure the TB is closing. Check your decel valve. Check the AAR.
That diaphram unit that opens teh throttle is to prevent stalling when the auto tranny shifts down into first when rolling up to a ligt. There are adjustment directions in the book. If it is staying fully extended....it is either leaking....which is uncommon but happens, or the vacuum supply to the tranny modulator of the plenum is leaking. Ray
The pressure regulator will only cause pressure higher than it is design to....if it is restricted, (like a bent or clogged return) Has avastly larger pump than its design flow (like possibly a large CIS pump)....or if the diaphram is rusted so it is not releasing from the pressure orifice.
When vacuum is highest...pressure is lowest. When vacuum is lowest...pressure is highest. Check your throttle cable to make sure the TB is closing. Check your decel valve. Check the AAR.
That diaphram unit that opens teh throttle is to prevent stalling when the auto tranny shifts down into first when rolling up to a ligt. There are adjustment directions in the book. If it is staying fully extended....it is either leaking....which is uncommon but happens, or the vacuum supply to the tranny modulator of the plenum is leaking. Ray
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Longbeach412
- Posts: 308
- Joined: Thu Aug 19, 2004 6:34 am
That's what I was thinking too. The chain of events started when I drained & flushed the fuel tank. So, either I kinked the return line somewhere or, some of the fine loose rust clogged it. Yup, mother event was flushing the tank, which led to sending unit reading overfull, testing it, leaving ign on overnight, dead battery, charged battery, high fuel press & idle. Thanks Ray for chiming in!