I have a 1992 Ecipse turbo, five speed, that I can't get to idle worth a darn. It is very erratic, "chugs" and the exhaust smells very "rich". However, it runs well at highway speed.I have put in new plugs, wires, fuel pump, rebuilt injectors (blue) and idle air flow valve. The fuel pressure is 30 PSI withe vacuum hose connected to the pressure regulator and about 38 PSI when disconnected. It also has a rebuilt ECM. There are no codes in the computer indicating that anything is wrong (mass air flow sensor, etc.) Help !!!Les
Country: United StatesMake: MitsubishiModel: ElipseYear: 1992Engine: 2000 turbo
Hello and Welcome to Just Answer. My name is XXXXX XXXXX X will try my best to assist you and your 100% satisfaction is my goal. I have been working on these vehicles for over 10 years so I am very familiar with this system and how they work. However, keep in mind, that I need some solid concrete facts/evidence/clues from you in order to give you a good answer about your vehicle. Please realize that all my answers are based solely on the info that you provide me with.You might have an air or a vacuum leak. This is very common! Open the hood and listen for a hissing sound when the engine is running. Unmetered air can enter the engine through a vacuum leak, a dirty airflow sensor that is not reading airflow accurately, an EGR valve is not closing and is leaking exhaust into the intake manifold, an EGR valve that is allowing too much flow.Also, your throttle body may be carboned up and need to be cleaned! This can cause all sorts of idle and hesitation problems. This is caused by the throttle plate not seating properly. The First thing i would do is clean out the throttle body with some throttle plate and intake cleaner and a small brush. Another common cause would be the Idle Air Control motor. This is very common on older cars. The IAC motor gets lazy and cant keep up with the fast idle changes. Also when the IAC motor is out, I rec to check the passages for carbon build up. If they are plugged they need to be cleaned out. Possible Causes Check for air leaks in the Air Induction system (e.g., in the intake manifold)Check for air leaks in the PCV system and in its related hoses and/or valveIdle air inlet passage or throttle bore is dirty or full of depositsIAC valve has failed MAF sensor is dirty, "skewed" or installed improperlyThrottle plate, throttle shaft or linkage is damaged or stickingTP sensor is out-of-range or "skewed" high
The IAC is new, but I will check the passages. I have cleaned and checked the EGR
valve with a vacuum test pump and it seems to be functioning OK. It looks like the main things I need to do is clean the throttle body and turn the thing upside down looking for air/vacuum leaks.
One thing that I forgot to mention is that when I was testing the fuel pressure the engine
ran better with the vac hose off the regulator, 40 psi, and even better when I pinched of the fuel return hose - 50 psi! Does that tell you anything?
Please reply. Thanks!!!
Hello!YES.. this tells me that your engine is running lean. This could be because of an air or vacuum leak or a bad MAP/MAF sensor.
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