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need help with freeze frame

Crunchnmunch

By Crunchnmunch
in Ask A GM Technician

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Crunchnmunch Enthusiast

Crunchnmunch

Posted
Posted

i recently purchased a truck approx 5 months ago and it has been hell. its a 2003 gmc sierra k1500 v8 4.8L manual reg cab long box 137000km. i have a hole lot of problems with it, so far i have changed all the brake pads, calipers, rotors, brake lines also have replaced spark plug wires, plugs and changed 3 coil packs 1,5,6. iv been dealing with a random misfire code p0300,p1380. i had gm hook up a code reader and they said cylinder 1,5,6 were the worst thats y i replaced the packs but to no avail that didnt help. i purchased a code reader for my laptop and started looking at the freeze frame data but to be honest im pretty lost with it. this data if from a trip to my cottage and back 100km/h for approx 400km

just wondering if any one can look at my data and give me an idea of what i should try next.

sorry the program i use wont let me save the data so i had to printscreen and piece it together

 

1_zps600e0b77.png

2_zpsc643024a.png

3_zps29fbc649.png

4_zpsc5596535.png

5_zps12f542ef.png

6_zpsfe2de9b3.png

7_zpsfd0e660b.png

8_zps69949816.png

9_zps6d225756.png

10_zpsd5848029.png

12_zps36c3200b.png

13_zpsfb47d950.png

aflesch Enthusiast

aflesch

Posted
Posted

The throttle position numbers don't look right. It could just be the instant the freeze frame was taken but I would get a scope on the TPS just to make sure.

Crunchnmunch Enthusiast

Crunchnmunch

Posted
  • Author
Posted

The throttle position numbers don't look right. It could just be the instant the freeze frame was taken but I would get a scope on the TPS just to make sure.

 

 

I'll take off the plug and check what volts it's giving me

 

Any one else have any ideas or have ever incounterd those codes

aflesch Enthusiast

aflesch

Posted
Posted

You can't just take off the plug and measure the voltage. You have to probe the sweeper on the POT from the back side of the plug with it still connected. Do the test with KOEO and run a slow smooth sweep from 0-100% throttle using the pedal to actuate it. You really can't do it with a DMM. You really need an oscilloscope or a scanner with graphing capabilities.

Crunchnmunch Enthusiast

Crunchnmunch

Posted
  • Author
Posted

You can't just take off the plug and measure the voltage. You have to probe the sweeper on the POT from the back side of the plug with it still connected. Do the test with KOEO and run a slow smooth sweep from 0-100% throttle using the pedal to actuate it. You really can't do it with a DMM. You really need an oscilloscope or a scanner with graphing capabilities.

 

 

ok ill ask my brother if his program can do that, he tunes cars for a living so im sure he can thanks in advance

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted

did you go back and get your diagnosis money back after you changed the coils?

 

its THEIR fault it didnt work,

 

what was the labour for them to change the coils ?

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