1990 325i Sedan (M20)
Generally when cold starting my idle is rough and around 550 rpm
When I blip the throttle the car rpm drops and the engine sputters before gaining rpm
Overall lack of power
old compression test results here: https://www.r3vlimited.com/board/sho...d.php?t=399036
I have replaced the fuel filter and the lines before and after the filter with R9 hose (was leaking fuel, the lines were dry rot)
I replaced the fuel line to the fuel pressure regulator and the vacuum line to the fuel pressure regulator
I installed an inline T to a gauge on the fuel line below the fuel pressure regulator. Setup as seen in this pic:https://drive.google.com/file/d/0B34...ew?usp=sharing using this gauge: http://a.co/6PNywuD
At idle (idling around 900) the gauge read ~38 psi stable
When the throttle was blipped the gauge would shoot up to 50+ and with rpm gain the pressure would drop back to ~38 in seconds (hard to see while inside vehicle)
When pinching the vacuum line to the fuel pressure regulator the pressure was a stable 45 psi, when released it returned to 38
After the car was turned off, the pressure remained at 38 for 15+ minutes.
The car was filled with 89 octane fuel and was approximately 75% full during the test
Have I properly tested my fuel pressure and FPR? What do these results indicate if they have been taken correctly? If they were not taken correctly, or I have missed something please let me know.
Generally when cold starting my idle is rough and around 550 rpm
When I blip the throttle the car rpm drops and the engine sputters before gaining rpm
Overall lack of power
old compression test results here: https://www.r3vlimited.com/board/sho...d.php?t=399036
I have replaced the fuel filter and the lines before and after the filter with R9 hose (was leaking fuel, the lines were dry rot)
I replaced the fuel line to the fuel pressure regulator and the vacuum line to the fuel pressure regulator
I installed an inline T to a gauge on the fuel line below the fuel pressure regulator. Setup as seen in this pic:https://drive.google.com/file/d/0B34...ew?usp=sharing using this gauge: http://a.co/6PNywuD
At idle (idling around 900) the gauge read ~38 psi stable
When the throttle was blipped the gauge would shoot up to 50+ and with rpm gain the pressure would drop back to ~38 in seconds (hard to see while inside vehicle)
When pinching the vacuum line to the fuel pressure regulator the pressure was a stable 45 psi, when released it returned to 38
After the car was turned off, the pressure remained at 38 for 15+ minutes.
The car was filled with 89 octane fuel and was approximately 75% full during the test
Have I properly tested my fuel pressure and FPR? What do these results indicate if they have been taken correctly? If they were not taken correctly, or I have missed something please let me know.
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