 |
 | Home | Contact Us | FAQ | Search & Site Map | Link to Us |
 | Sign In | Join | Other 45 Sites in Network |
Car Forum / Porsche / Porshe 944 / May 2008Fuel pressure problem?
I have a '83 944. I seem to be having a fuel pressure problem, I think? It starts ok but doesn't ideal very good. When I hold done the accelerator it keeps running for about 30 seconds and then the fuel pressure goes up about 10lbs and then dies. The pressure starts out right (30lbs) but as the car is dieing it goes up to around 40lbs. When I let it sit and watch the pressure gauge it even goes a little higher with out the car running. I can restart it with out any problems but the same thing happens again. It seems to run better once it's warmed up but will still die after about 10min???? I have newer fuel filter, about 500 miles on it, new pressure regulator, checked for vacuum leaks, switched DME and tried a new DME/fuel relay....don't know where else to look. thanks for any help. fuel pressure is regulated by engine vacuum - as your car is dying the vacuum drops, causing the regulator to raise the pressure - that's normal >I have a '83 944. I seem to be having a fuel pressure problem, I think? >It starts ok but doesn't ideal very good. When I hold done the accelerator [quoted text clipped - 11 lines] > > thanks for any help. ** Posted from http://www.teranews.com ** Either the fuel pressure regulator is not working correctly or the vacuum is not reaching the regulator correctly. Try checking the vacuum to see that it does not change radically. Looks like I'm in for some more fun. I found my vacuum leak. I had to remove the intake manifold to see it. As I was pumping air into the system to find my leak I found that the end cap (I think) of the balance shaft is leaking. I can push it in and pull it partly out. As I pump in air it pops out about 1/4" and leaks air. So I guess I need to rebuild the balance shaft. Anyone know where I can buy a complete sealing kit or do I need to order each seal and o-ring separately? thanks..... >I have a '83 944. I seem to be having a fuel pressure problem, I think? >It starts ok but doesn't ideal very good. When I hold done the accelerator [quoted text clipped - 11 lines] > > thanks for any help. this does not sound right - - if you get too much pressure it will pressurize the crank case - the covers on the back of the balance shafts can move - but all they will do is make an oil leak - you could have a bad air flow meter, or a bad connection to the AFM - there is an excellent article on the web showing how to test the AFM - your car is different from the newer ones - my guess is that you either have no signal from the AFM or a fairly significant air leak, probably in the J tube. > Looks like I'm in for some more fun. I found my vacuum leak. I had to > remove the intake manifold to see it. As I was pumping air into the [quoted text clipped - 23 lines] >> >> thanks for any help. ** Posted from http://www.teranews.com ** I'm finding out that there are 2 balance shaft. The one I'm taking about is the "upper". It leaking air alright. I can see the end cap (pointing to the rear of the engine) pop out every time I apply are to the vacuum line and when I put my hand there I can feel the air escape. No I don't see any oil or water leaks , should I? I would have guessed to see oil leaking out too but no oil leak anywhere. That is about the only thing I don't have problems with on this car. I did find some minor air leaks but nothing like this one. I'm tempted to duct tape it tight just to see if it helps before I pull it all apart. > this does not sound right - - if you get too much pressure it will > pressurize the crank case - the covers on the back of the balance shafts [quoted text clipped - 32 lines] > > ** Posted from http://www.teranews.com ** I have taken the belt off the balance shafts of both 944's I have. They just rob the engine of power. >I have taken the belt off the balance shafts of both 944's I have. > They just rob the engine of power. they may cause some small loss of power, but they also significantly reduce vibration - personally I prefer the lower vibration, but if you are racing, power is everything. But I'm not racing. ** Posted from http://www.teranews.com **
|
Reply to this Message |
 Sign In
 Join
 My Latest Posts My Monitored Threads My Blog My Photo Gallery My Profile My Homepage Start New Thread Enable EMail Alerts Rate this Thread
|
©2008 Advenet LLC Privacy Policy - Terms of Use
This website includes both content owned or controlled by Advenet as well as content owned or controlled by third parties.