random code p0307 and p0300 - Page 2

joejoe1985 · 05-29-2008, 02:30 PM

im gonna go ahead drop the tank this weekend add new fuel pump and filter and see if that helps

joejoe1985 · 05-30-2008, 09:04 PM

before i drop the gas tank in the morning i thought of checking the fuel pressure regulator on the vortec do u have to have a vaccum pump to test it?

leolkfrm · 05-31-2008, 05:35 AM

Is the throttle position sensor voltage within the proper range? I'm a believer of a good scan tool, check the actual readings of the sensors against spec, instead of throwing parts at codes.

junior3382 · 05-31-2008, 03:39 PM

I had very similar inexplicable codes for months, some members on here know how much they disturbed me. po300 and po303... However, may parts and diagnostics later, nothing was found..... however, experience has led me to believe that it could literally be anything! Turns out in my case, it was a foriegn peice of metal stuck in the motor, and now the poor things is in the middle of major surgery..... Rare, and unpredictable as it is.... but it happened. Seems like you are on the right track, and many have given great advice here.... I just wanted to offer encouragement for you and anyone looking into seemingly odd codes like this with no appearent faults. beware, ECU's never lie.... sometimes we just cannot understand them. So even if all does not in the end fix the problem, do not think it will go away on its own.... that was my fatal mistake. Just felt like adding that.... sorry...

joejoe1985 · 06-09-2008, 03:22 PM

i changed fuel pump and screen then noticed did have a intake gasket leak so i replaced it and now noticed my timing is off getting the p1345 code so think i wanna buy a scan tool to set timing where can i get one thats good quality for affordable price?

joejoe1985 · 06-10-2008, 03:01 PM

btw i already have a laptop so do i just need to buy the cable and software? or would u reccomend buying whole new scanner

05-31-2008, 03:39 PM	#14
junior3382 Senior Member Join Date: Mar 2007 Location: Currently, I live in Lancaster county, Pennsylvania. Posts: 3,170	I had very similar inexplicable codes for months, some members on here know how much they disturbed me. po300 and po303... However, may parts and diagnostics later, nothing was found..... however, experience has led me to believe that it could literally be anything! Turns out in my case, it was a foriegn peice of metal stuck in the motor, and now the poor things is in the middle of major surgery..... Rare, and unpredictable as it is.... but it happened. Seems like you are on the right track, and many have given great advice here.... I just wanted to offer encouragement for you and anyone looking into seemingly odd codes like this with no appearent faults. beware, ECU's never lie.... sometimes we just cannot understand them. So even if all does not in the end fix the problem, do not think it will go away on its own.... that was my fatal mistake. Just felt like adding that.... sorry... __________________ *The Blazer is dead, so I pumped her with lead, laid her to bed, and bought a FORD instead!*

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05-29-2008, 02:30 PM	#11
joejoe1985 Full Member Join Date: May 2008 Posts: 15	im gonna go ahead drop the tank this weekend add new fuel pump and filter and see if that helps

05-30-2008, 09:04 PM	#12
joejoe1985 Full Member Join Date: May 2008 Posts: 15	before i drop the gas tank in the morning i thought of checking the fuel pressure regulator on the vortec do u have to have a vaccum pump to test it?

05-31-2008, 05:35 AM	#13
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,926	Is the throttle position sensor voltage within the proper range? I'm a believer of a good scan tool, check the actual readings of the sensors against spec, instead of throwing parts at codes.

06-09-2008, 03:22 PM	#15
joejoe1985 Full Member Join Date: May 2008 Posts: 15	i changed fuel pump and screen then noticed did have a intake gasket leak so i replaced it and now noticed my timing is off getting the p1345 code so think i wanna buy a scan tool to set timing where can i get one thats good quality for affordable price?

06-10-2008, 03:01 PM	#16
joejoe1985 Full Member Join Date: May 2008 Posts: 15	btw i already have a laptop so do i just need to buy the cable and software? or would u reccomend buying whole new scanner