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FSM vs. Owner's Manual - Spark Plug Gap

Discussion in '80-Series Tech' started by fuzzywuzzy, Jun 16, 2017.

  1. fuzzywuzzy

    fuzzywuzzy

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    Hi All - this weekend I'm going to be adjusting my valves in my continued attempt to pass smog and was checking the FSM I downloaded from online and there's a difference in gap recommendations between the FSM and the Owner's Manual that the truck came with.

    I downloaded the FSM from another forum, it has a blue/white cover and has, "TOYOTA 3F-E ENGINE REPAIR MANUAL SUPPLEMENT AUG. 1988" and then down at the bottom Pub. No. RM134E. On page EM-9 the states the gap should be 0.8 mm or 0.031 in.

    The owner's manual states 1.1 mm or 0.043 in.

    So my question is, is the FSM specific for each year? The sticker under my hood states I have a 3F-E CAL engine in my 91; is the 3F-E in a 88 different from the 3F-E in a 91 and would they have different gap requirements?
     
  2. Rifleman

    Rifleman

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    To answer your question, yes FSM can be specific to each year due to the fact that Toyota can, and will make changes from year to year. Next, since you don't have a FSM for your year truck, follow the spec's in your owners manual, as long as that owners manual is for the same model and year as your truck.
     
    Last edited: Jun 18, 2017 at 1:43 AM
  3. baldilocks

    baldilocks GOLD Star

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  4. inkpot

    inkpot SILVER Star

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    Is yours a 3Fe also?
     
  5. fuzzywuzzy

    fuzzywuzzy

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    Yes- sticker in engine bay says 3F-E CAL
     
  6. fuzzywuzzy

    fuzzywuzzy

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    We're different engines available in 1991. Wondering if the owners manual is for a diff engine.
     
  7. Rifleman

    Rifleman

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    Your 94 has a 1FZFE motor in it, if I'm not mistaken he's running a 3F-E motor in his 91, that's a completely different animal then the 1FZFE is.
     
  8. baldilocks

    baldilocks GOLD Star

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    My point in posting that info was that my fsm for a completely different engine concurred with his so .031 is probably correct. No telling what owners manual he has.
     
  9. Rifleman

    Rifleman

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    That's the reason i told him to use his owners manual in my first post, here's my quote, "follow the spec's in your owners manual, as long as that owners manual is for the same model and year as your truck" end quote.
     
  10. fuzzywuzzy

    fuzzywuzzy

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    The manual is for a 91 Land Cruiser and when discussing engine in the back it says 3F-E
     
  11. DirtScaresMe

    DirtScaresMe

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    Same. Although I get shade from ih8mud for gapping the sparkplugs to that since they're pre-set with something better if you buy the toyota versions these days. I keep gapping them to the fsm; doesn't seem to have any issues.
     
  12. Dave 2000

    Dave 2000 Not all Land Rovers are useless! SILVER Star

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    To the OP, spend a little time getting this right. Apart from the usual reasons to get the gaps right, the OE recommendations allow for gaps opening over time, if you start with too big a gap then initially no real problems, if the gap gets too big then this can cause issues such as lead failures and tracking around the cap/coil etc.

    Regards

    Dave
     
  13. fuzzywuzzy

    fuzzywuzzy

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    Doing the best I can, unfortunately when looking at the two options, I have to choose one and I went with the Owner's Manual for now. Yesterday I adjusted the valves, checked compression (new vehicle to me so wanted to see where I stood), and updated gap. Seems to be running smooth.
     
  14. Rivman1243

    Rivman1243 SILVER Star

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    Isn't there a sticker in the engine compartment stating valve lash, timing, and plug gap
     
  15. baldilocks

    baldilocks GOLD Star

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    @LS1FJ40 is a 3fe guy from way back. Maybe he can shed some light on your situation.
     
  16. fuzzywuzzy

    fuzzywuzzy

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    Lash and timing yes, gap no. I'll lol again tonight but didn't see it before.
     
  17. LS1FJ40

    LS1FJ40 SILVER Star

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    I don't know what the gap is supposed to be. I always buy the plugs pregapped. @jonheld probably knows off the top of his head.
     
  18. BILT4ME

    BILT4ME

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    Are you talking about SPARK PLUG GAP or VALVE LASH?

    The title says Spark Plug Gap, but the first sentence states "I'm going to be adjusting my valves". Typically , adjusting the valves is NOT addressed in the Owner's Manual, only in the FSM.

    Otherwise, follow what is stated in your year-appropriate manual, whether it is owner's or FSM.
     
  19. fuzzywuzzy

    fuzzywuzzy

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    Was going to be tearing into the engine anyway, needed to adjust valves and check compression and figured since I was going to elbow deep in things might as well update plugs if needed at the same time. Ended up gapping spark plugs based on owner's manual.
     
  20. jonheld

    jonheld

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    There was a difference in spark plug gap between the FJ62 3FE and the FJ80 3FE. There is a different ECU and different coil/igniter. The smaller gap is from an FJ62. The correct gap for the FJ80 version (assuming you have the rest of the FJ80 components) is 1.1mm.

    Valve adjustment specs are printed on the sticker under the hood.
    Valve clearance (Hot):
    Intake 0.20 mm (0.008 in.)
    Exhaust 0.35 mm (0.014 in.)
     
    LS1FJ40 likes this.