2003 GMC Truck 6 cyl Four Wheel Drive Automatic 135000 miles
Three days ago I was driving at nearly 60km/h and the truch lost power. The more I press the accelerator the louder becomes the engine sound, as if there was a lion inside. I shifted the gear manually to 1st gear. it gave me the SES and Reduced engine power lights. I scanned the PCM and the trouble code was P1514. Actron scanner explained it as TB problem. So I purchased a new one and installed it, but a new problem occured. Before, it used to produce the sound. Now, it produces the sound in addition to cutting of and running regularly and continuously as long as I keep pressing the pedal. The pedal is 7 months old, O2 sensors, TB, fan clutch, all new. The sound is like the TB is open wide but no fuel to accelerate the engine. At nuetral, the engine runs normally. It happens only when I accelerate, and it dies out when warm.
Can it be the MAP?
The scanner read as follows:
MAP KPA = 100 While Ignition switch =ON
MAP KPA = 35 While the engine is running
Can it be the fuel pump?
How can I check the pressure of the fuel pump without tools?
I saw a valve on the fuel line. Is it the check pressure valve? (Picture)
Can it be the fuel regulator? How does it function & what does it do?
Saturday, March 7th, 2009 AT 3:11 PM