CHIM Posted June 3, 2005 Share Posted June 3, 2005 Ok, i have had this problem for a while but it's really starting to bother me. Thing runs beutifull cold and warm idle's smooth as glass, BUT, It has alot less power when warm, Not hot. It runs normal plus i have a 92 legacy radiator in to so i know it's stayin plenty cool. It's an 84 MPFI Turbo, Has a EA82 water cooled turbo as well. Any ideas as to why this thing looses a larg amount of power when she warms up?, Oh doesn't really matter if it's hot or cold out, I did cut the bottom of my air box out too. ~CHIM~ Link to comment Share on other sites More sharing options...
Ross Posted June 3, 2005 Share Posted June 3, 2005 Is your timing set to 15 Deg BTDC? If its too far advanced your engine could start to knock when it warms up, causing the knock control unit to retard the timing. Link to comment Share on other sites More sharing options...
CHIM Posted June 3, 2005 Author Share Posted June 3, 2005 Is your timing set to 15 Deg BTDC? If its too far advanced your engine could start to knock when it warms up, causing the knock control unit to retard the timing. Yup, set dead on @15 BTDC Link to comment Share on other sites More sharing options...
naru Posted June 3, 2005 Share Posted June 3, 2005 Ok, i have had this problem for a while but it's really starting to bother me. Thing runs beutifull cold and warm idle's smooth as glass, BUT, It has alot less power when warm, Not hot. It runs normal plus i have a 92 legacy radiator in to so i know it's stayin plenty cool. It's an 84 MPFI Turbo, Has a EA82 water cooled turbo as well. Any ideas as to why this thing looses a larg amount of power when she warms up?, Oh doesn't really matter if it's hot or cold out, I did cut the bottom of my air box out too. ~CHIM~ Sounds like a CTS problem.Try unplugging it after the car warms up. Link to comment Share on other sites More sharing options...
CHIM Posted June 3, 2005 Author Share Posted June 3, 2005 Sounds like a CTS problem.Try unplugging it after the car warms up. Im new to FI, what is a CTS?, and where do i unplug it at?, also whats it do? Link to comment Share on other sites More sharing options...
hooziewhatsit Posted June 3, 2005 Share Posted June 3, 2005 CTS - Coolant Temp Sensor Basically it tells the ECU what the temp of the engine is, to allow it to adjust fuel stuff accordingly. I'm sure someone else will chip in much more technical info about it. On a normal SPFI car (not sure about your conversion though), it's mounted horizontally in the thermostat housing with a pigtail & green plug on it. Link to comment Share on other sites More sharing options...
CHIM Posted June 3, 2005 Author Share Posted June 3, 2005 CTS - Coolant Temp Sensor Basically it tells the ECU what the temp of the engine is, to allow it to adjust fuel stuff accordingly. I'm sure someone else will chip in much more technical info about it. On a normal SPFI car (not sure about your conversion though), it's mounted horizontally in the thermostat housing with a pigtail & green plug on it. My car is a MPFI Factory, where would this little dude be?, Is it the same one that runs my temp guage? Also, would this sensor show up on the ecu as being defective?, asking couse my ecu reports everything as OK. Link to comment Share on other sites More sharing options...
naru Posted June 3, 2005 Share Posted June 3, 2005 Im new to FI, what is a CTS?, and where do i unplug it at?, also whats it do? CTS=coolant temperature sender.The computer supplies less fuel as coolant temp increases.Yours may take this to an unpowerful extreme. Unplugging the CTS will cause the ECU to default to a richer cold engine fuel mixture.It is located below the upper rad hose adjacent to the disty vacuum advance.(have the engine off when you unplug it) Some other things to consider would be a weak fuel pump or a fault in a vacuum system controlled by one of the thermovalves. Link to comment Share on other sites More sharing options...
naru Posted June 3, 2005 Share Posted June 3, 2005 Is it the same one that runs my temp guage? Also, would this sensor show up on the ecu as being defective?, asking couse my ecu reports everything as OK. No and very unlikely. Link to comment Share on other sites More sharing options...
CHIM Posted June 3, 2005 Author Share Posted June 3, 2005 Ok, there was a vacuume sensor deal going into the themostat housing that i removed, i pulled off the sensor to put in a coolant pipe that ran back to the turbo, wich is also the same set up as the 84 turbo i pulled it off of. Another thing, my car used to have a o2 sensor in the down pipe, when i changed to the EA82 turbo i had to use the EA82 down pipe as well but the new downpipe has no o2 sensor. Could this also cause a problem? Now for the feul pump, if i where to test it's pressure what would the pressure be?, What should it be? Ill post a few pics on here as well to show wich vacuume sensor i unplugged. Link to comment Share on other sites More sharing options...
CHIM Posted June 3, 2005 Author Share Posted June 3, 2005 http://www.ultimatesubaru.org/photos/showphoto.php?photo=6167&size=big&sort=1&cat=500 http://www.ultimatesubaru.org/photos/showphoto.php?photo=6168&size=big&sort=1&cat=500 Ok, first pic is of the 84 doner motor where i got the water lines for my car, the red circle is where the water line ran to the turbo, the blue one is where mine is set up but this motor is blocked off here. Second pic is my motor, red is where the vacuume sensor used to be but is now where the water line runs to the turbo. So now my question is "how bad did i mess it up?, was that sensor needed? the hoses from this sensor ran into the throtle body, Didn't look as if i needed it but what do i know. Can't figuer out how to past a photo in here:confused: But anyway this is what i have set up. I looked at my downpipe and i guess the new one does have an o2 sensor, but no wire attached, Do i need a o2 sensor? Link to comment Share on other sites More sharing options...
All_talk Posted June 3, 2005 Share Posted June 3, 2005 OK, I dont mean to sound like an A$$, but you have a computer controled fuel/ignition system and you have removed two of its input or output devices and you want to know if will affect how it runs?? :-\ Sorry Gary Link to comment Share on other sites More sharing options...
hooziewhatsit Posted June 3, 2005 Share Posted June 3, 2005 so this is an EA81 MPFI? anywho, looking at your first picture, the sensor + plug right below the blue circle looks the same as the CTS on my 85 EA82 MPFI. In the second picture it looks like the CTS is also there under the red circle. someone else can verify this though Link to comment Share on other sites More sharing options...
[HTi]Johnson Posted June 3, 2005 Share Posted June 3, 2005 You took the pipe that ran from the top of the thermostat housing to the intake? That's bad. It's required. As I look at it more...this is an ea81?! Link to comment Share on other sites More sharing options...
CHIM Posted June 3, 2005 Author Share Posted June 3, 2005 Yes this is an EA81, i wasn't aware that there was a 1984 EA82, Any way it's a EA81 MPFI Turbo, In the second pic you can see a water hose, There used to be a vacuume sensor, all hoses,no wires, 1 hose went to the purge canister and the other 2 went to the throtle body, i pulled this sensor out and put a water hose in it's place. Now on the car that i pulled these hoses out of wich is also a EA81 MPFI Turbo did not have this vacuume sensor, so i figuered i didn't need it. How would this sensor be nessasary on one motor and not an identical motor of the same year? Also do i need the o2 sensor? Link to comment Share on other sites More sharing options...
naru Posted June 3, 2005 Share Posted June 3, 2005 http://www.ultimatesubaru.org/photos/showphoto.php?photo=6167&size=big&sort=1&cat=500 http://www.ultimatesubaru.org/photos/showphoto.php?photo=6168&size=big&sort=1&cat=500 Ok, first pic is of the 84 doner motor where i got the water lines for my car, the red circle is where the water line ran to the turbo, the blue one is where mine is set up but this motor is blocked off here. Second pic is my motor, red is where the vacuume sensor used to be but is now where the water line runs to the turbo. So now my question is "how bad did i mess it up?, was that sensor needed? the hoses from this sensor ran into the throtle body, Didn't look as if i needed it but what do i know. Can't figuer out how to past a photo in here:confused: But anyway this is what i have set up. I looked at my downpipe and i guess the new one does have an o2 sensor, but no wire attached, Do i need a o2 sensor? CTS is below the blue circle in pic#1. O2 sensor is highly reccomended,but,is unlikely to be your problem as the ECU ignores it above 1/3 throttle. Your turbo is plumbed uncoventionly.Normally,one side is teed into the heater hoses and the other attaches to a drain plug hole on the bottom of the RH head. Actually,the thermovalve is not all that essential,but,it does make a difference how the hoses are hooked up after its removal.The thermovalve disables cannister purge,EGR operation and disty vacuum advance at low temps. Depending on how the vacuum hoses are routed now,the EGR may be non-functional.If so,you may have detonation when warm resulting in the knock sensor retarding timing(power loss). Fuel pressure should be 26-30 psi at idle. By the way,ea-82 turbos fit ea-81 downpipes by elongating 2 of the mounting holes Link to comment Share on other sites More sharing options...
Ross Posted June 4, 2005 Share Posted June 4, 2005 Depending on how the vacuum hoses are routed now,the EGR may be non-functional.If so,you may have detonation when warm resulting in the knock sensor retarding timing(power loss). I would definitely check this - something causing the knock control unit to retard the timing will give exactly the symptoms you describe. Link to comment Share on other sites More sharing options...
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