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I6 underhood service specifications

Discussion in 'Vortec 4.2L I-6' started by MAY03LT, Nov 30, 2011.

  1. MAY03LT

    MAY03LT Well-Known Member

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    Oil grade: 5w30 (All temperatures)
    Oil capacity: 7qts w/filter

    Battery:
    02-09 Group 78 600CA

    Alternator:
    150A

    Spark Plug Torque:
    02-09 13ft/lb

    Spark Plug Gap:
    Note - Posted for reference only. Gapping Iridium plugs is not recommended.
    02-04 .050"
    05-07 .042"
    08-09 .040"

    Fuel Pressure:
    02 48-54psi
    03-09 50-57psi

    Oil Pressure (at sending unit, engine warm, MINIMUM):
    12psi @1200rpm

    Firing Order:
    153624

    Compression:
    215psi - *Lowest cylinder must be more then 70% of highest cylinder

    Injectors:
    02-09 11-14 ohms @ 50-90°F

    Map sensor:
    02-05 More then 2.0v at idle less then 4.2v at WOT

    TPS1:
    02-06 Idle less then 4.67v WOT more then .27v
    07-09 Idle .32v WOT 4.75v

    TPS2:
    02-06 Idle more then .27v WOT less then 4.67v
    07-09 Idle .25v WOT 4.59v

    Coolant capacity (quarts):
    02-04 14
    05-06 10.8
    07-09 9.7

    03-04 EXT 15
    05-06 EXT 13.8

    Cooling system test pressure: 15psi
    Radiator Cap Relief: 15psi

    A/C data:
    Refrigerant type: R-134a
    Compressor oil: PAG 46

    Capacities (Refrigerant/Oil):
    02-03 1.8lbs/7.4oz
    04 1.9lbs/7.4oz
    05-06 1.9lbs/8.0oz
    07-09 1.9lbs - w/TPS 8.0oz (first design) w/oTPS (second design) 6.0oz

    02-03 F/R 2.65lb/8.45oz
    04 F/R 3.0lbs/8.45oz
    05-06 F/R 2.65lbs/8.0oz
    07-09 F/R 2.65lbs - w/TPS 8.0oz (first design) w/oTPS (second design) 6.0oz

    Note: TPS - Thermal Protection Switch

    Source: MOTOR spec guide 2011 version
     
    daveb673, Mounce, Redbeard and 3 others like this.
  2. MAY03LT

    MAY03LT Well-Known Member

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    Belt routing:

    [​IMG]

    SWB - 91.5" belt
    LWB - 90.5" belt
     
    Redbeard likes this.
  3. MAY03LT

    MAY03LT Well-Known Member

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    reserved for additional information
     
  4. JRTAHOE

    JRTAHOE Well-Known Member

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    This thread delivers :cool:
     
  5. Regulator

    Regulator Well-Known Member

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    Great information here, thanks a bunch!

    How about adding fluid type and capacities for the other serviceable parts. Transmission, Transfer Case, Front Differential, & Rear Differential.
     
    mfnman88 and Redbeard like this.
  6. Wooluf1952

    Wooluf1952 Well-Known Member

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    Nice to have it all on one page. :wootwoot:
     
    Redbeard likes this.
  7. MAY03LT

    MAY03LT Well-Known Member

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    Thanks man. I am going to list those in the "Engine and Drivetrain" forum since those specs can be used for the 4.2/5.3/6.0.

    That's the plan!:cool:
     
  8. HARDTRAILZ

    HARDTRAILZ Moderator

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    Well done! should defiunitely help alleviate some of the simpler questions.
     
    Redbeard likes this.
  9. Regulator

    Regulator Well-Known Member

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    So I have been starving the engine by only using 5 quarts of oil for the last 230,000 miles? :raspberry:
     
  10. ItsOnVoy

    ItsOnVoy Well-Known Member

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    This is great and will be a big help!! Thanks :biggrin:
     
  11. JPZ

    JPZ Active Member

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    Thanks. I got a belt that I need to put on and I didnt notice the diagram on the fan shroud. That's gonna help.
     
  12. Joe D 04

    Joe D 04 Active Member

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    How about back pressure for the exhaust?

    I'm thinking about testing to see if I have a clogged cat and buying my own gauge
     
  13. Sparky

    Sparky Moderator

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    Whoa, I never realized there was that huge a coolant capacity difference between the various years. I could see a little bit of a difference on the 06+, but a whole gallon? Weird.
     
    Redbeard likes this.
  14. Steve A

    Steve A Well-Known Member

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    Redbeard and jpinoy like this.
  15. Mypetropig

    Mypetropig Well-Known Member

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    So what are TPS 1 and TPS 2 for and where are they located? This article says that the plug gap for my 03 should be .050" and mine I believe were pregapped at .043", will it change anything if they were at .050"? Lots of info here and it gives me some things to check tomorrow.
     
  16. Wooluf1952

    Wooluf1952 Well-Known Member

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    Hover your cursor over the TPS and it will show the meaning.

    One is on the gas pedal and one is in the throttle body.

    IIRC, the .043" is an up-date.
     
  17. The_Roadie

    The_Roadie Well-Known Member

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    Admin Post
    There are TWO sensors in the throttle body, and the shop manual calls these the TPS. There are another two sensors on the Accelerator Pedal assy, and these are typically called the APP (Accel Pedal Position) sensors. The reason for two sensors on each is because their positions are compared by the PCM and if they don't agree, you go into REP (reduced engine power) mode to limp home or to the side of the road so we don't end up in a runaway condition.
     
    Redbeard likes this.
  18. Mypetropig

    Mypetropig Well-Known Member

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    Cool trick with the cursor. On some of these items would it be easier to check with a volt meter or a scan tool such as one of these,Actron® or Actron®.
     
  19. Wooluf1952

    Wooluf1952 Well-Known Member

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    :redface: I stand corrected.
     
  20. Spalding1028

    Spalding1028 Well-Known Member

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    I'm not sure who recommended against gapping iridium spark plugs, but it's perfectly fine to gap them as long as you use a wire type gapper and not the slide/coin type.
     
  21. Wooluf1952

    Wooluf1952 Well-Known Member

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    I think the biggest problem is people prying in the gap itself and breaking off the tiny piece of Iridium and, as you stated, using the flat style gapper.
    Also, the AC Iridiums come pre-gapped with a shield to prevent the gap from being damaged in shipping.
     
  22. jes1888

    jes1888 Active Member

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    lol, i wonder where that is hahaha :rotfl:

    - - - Updated - - -

    lol, i wonder where that is hahaha :rotfl:
     
  23. hancock

    hancock Member

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    I have a 2006 envoy 4.2. Is that AC Delco part that I should # 41-103
    Getting new plugs for 2006 envoy 4.2. I'm getting AC Delco but can't remember what part# was recommend. 41-103?
     
  24. dmanns67

    dmanns67 Well-Known Member

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    AcDelco 41-103 is the correct spark plug to use with the I6.
     
  25. smt 59

    smt 59 Well-Known Member

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    Just an FYI, all this information is also in your owners manual
     
  26. Mooseman

    Mooseman Moderator

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    Not for the plugs. 41-103 is a new number.

    And the manual often goes missing so it's useful to have it available elsewhere.
     
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  27. dmanns67

    dmanns67 Well-Known Member

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    My Chilton Repair manual does not even list 41-103 for the I6. The manual listed a completely different spark plug number. I had to pencil-in the new AcDelco plug number.
     
  28. Wooluf1952

    Wooluf1952 Well-Known Member

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    Right. The Owners Manual for my 2003 Envoy I6, calls for AC 41-981. I've changed to the AC 41-103 Iridium.
     
  29. dkvasnicka

    dkvasnicka Silver Supporter

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    Does my 06 Saab 9-7X (which is not XL but has rear A/C) also fall into the "05-06 F/R 2.65lbs/8.0oz" category or is it 3 lbs? A shop filled my A/C up to about 850g of refrigerant (as I now found out from the invoice) and my A/C doesn't blow cold (the snowflake symbol doesn't blink though).
     
  30. Mounce

    Mounce Silver Supporter

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    Check the stickers in your engine compartment. One of them will specify refrigerant type and quantity required. That is likely the number they went by when recharging it.

    Verify whether or not the compressor clutch is engaging. If it is not and 850g is the amount listed on the sticker, take it back and have them check it again.

    - I'm assuming your ac worked when you left the shop but stopped working after? No way I would leave the shop with it not blowing cold.
     
  31. dkvasnicka

    dkvasnicka Silver Supporter

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    Just wanted to edit my post to say I went to look for the sticker and found it :smile: It's 2.65 lbs. It seemed to work when I was leaving the shop but it was quite cold outside (definitely not A/C-requiring temps) so I probably didn't judge it right.
     
  32. dkvasnicka

    dkvasnicka Silver Supporter

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    So I'm scheduled for fillup of the A/C but they are telling me it's not just the amount that causes it to not work at all. He told me that even with that 50 % of refrigerant it should blow cold, albeit not ice cold. Is that true? Last time it took a year for the refr. to leak out so there definitely is a leak... I just hoped it didn't get worse :sadcry:
     
  33. therealsethallen

    therealsethallen Well-Known Member

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    The 9-7x doesn't have rear A/C like the EXT/XL models. It's got ducting and rear controls for fan and that's it.

    The SWB Models are 1.81LBS
    LWB Models (EXT/XL) are 2.56LBS

    Both are R-134A
     
    Mounce and Mooseman like this.
  34. Mooseman

    Mooseman Moderator

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    Another member also believed he had a rear A/C and overcharged it. Use the lower amount for the single system.
     

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