My question is the car lacks power off and on meaning when gas pedal is pressed it almost seems like it falls on its face but when you let of the gas a little bit it moves better. I checked the fuel pressure and the reading is 35 to 39 psi. Whould this be the fuel pump?
Check the tps(throttle position sensor) voltages and grounds. one wire is battery voltage the other is reference voltage and the third is ground. the reference voltage should get higher smoothly as you move the throttle without any dropouts anywhere in the full movement from closed throttle to wide open.
SOURCE: Vehicle dies while driving down the road.
could it be the A/C pump kicking in. might be boging down the motor or electrical circuit, not letting the injectors get enough power. This could happen if the bearings are going bad in th A/C pump or there is a short in it. Just an idea. sounds like you have done the main components.
SOURCE: I have a 1988 delta 88 c code for 3.8 engine.It
Have you checked for vacuum leaks ? I would check first for vacuum leaks then check the timing.
SOURCE: aurora 1997 i have changed the fuel pump,, fuel filter plugs,
Hi there
sounds like you done allot to this car. did you clean your gas tank? Reason i say this there are times you get bad gas that water with it. and it sounds like you got water in your tank. need to get it out. Try this get some rubbing alcohol and poor it in your tank. It won't hurt it. It will soak up the water that's in your tank. try this and let me know how it goes.
Thank you for writing to fix ya.
Best Regards Richard
Testimonial: "yeah, i did that this morning, the gas tank had a bunch of **** in it, changed fuel filter, tank needed cleaned same prob still thanks though"
SOURCE: lack of power in gas pedal
check the air fillter and intake track, sometimes critters like to live up in there
SOURCE: 1999 olds 88. I
recommend you check your MAP sensor. You will need a voltmeter. Fig. Fig. 1: Manifold Absolute Pressure (MAP) sensor circuit Fig. Fig. 2: MAP sensor voltage specifications Fig. Fig. 4: On the 3.8L (VIN K) engine, the MAP sensor (1) is mounted in the PCV valve cover (2)
If you don't have a vacuum gage, just use your mouth to pull a vacuum on the hose and see if the voltage drops when you do.
Let me know if you have questions.
OPERATION
The Manifold Absolute Pressure (MAP) sensor, used on 1996-99 vehicles, measures the changes in intake manifold pressure which result from engine load/speed changes, and converts this information to a voltage output. The MAP sensor reading is the opposite of a vacuum gauge reading: when manifold pressure is high, MAP sensor value is high and vacuum is low. A MAP sensor will produce a low output on engine coast-down with a closed throttle while a wide open throttle will produce a high output. The high output is produced because the pressure inside the manifold is the same as outside the manifold, so 100 percent of the outside air pressure is measured.
The MAP sensor is also used to measure barometric pressure under certain conditions, which allows the PCM to automatically adjust for different altitudes.
The MAP sensor changes the 5 volt signal supplied by the PCM, which reads the change and uses the information to control fuel delivery and ignition timing.
TESTING
See Figures 1 and 2
When pumping up and releasing the vacuum, check to make sure the voltage readings are smooth. When applying vacuum to the sensor, the change in voltage should happen instantly. A slow change in voltage could point to a faulty sensor.
REMOVAL & INSTALLATION
3.8L (VIN K) Engine
See Figure 4
On these engines, the MAP sensor is mounted to the PCV valve cover.
To install:
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