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Thread: won't rev above 4000rpm

  1. #16
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    Default Re: won't rev above 4000rpm

    Quote Originally Posted by Kyosho
    Alot of engines break down spark on high RPM once on boost. Backing off and they'll cruise to red line.
    That's exactly what I'm getting.

    I have overlooked that actually because all my plugs are in pretty bad shape after running so rich.

  2. #17
    30DET... The only way. Carport Converter Kyosho's Avatar
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    Default Re: won't rev above 4000rpm

    New plugs FTW.

    Go buy some now. They make the world of difference!
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  3. #18
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    Default Re: won't rev above 4000rpm

    Impulse buy eh. Well I went out and purchased a set of copper equivalents. The car now revs up to 5000rpm, stutters then goes on to 5800/6000 and is limited around there. I know it's stopping at around 5800rpm because I need a different ignitor which I have not put in. But the stuttering around the lower rpms is still a cause for concern and I'm still getting the black smoke. I guess next step is the dizzy.

  4. #19
    30DET... The only way. Carport Converter Kyosho's Avatar
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    Default Re: won't rev above 4000rpm

    Gap plugs down to 0.8mm
    You probably have 1.1mm gaps
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  5. #20
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    Default Re: won't rev above 4000rpm

    I bought the bkr6e and was told they should be 0.8mm gap. Can't seem to find my feeler gauge so I've got no choice but to trust them.

  6. #21
    30DET... The only way. Carport Converter Kyosho's Avatar
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    Default Re: won't rev above 4000rpm

    They're a 1.1mm gap AFAIK.

    Also, what coil is the motor running on atm? The Gen2 or 3 one?
    Swap to the Original motors coil before changing plugs around again.
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  7. #22
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    Default Re: won't rev above 4000rpm

    The bkr6e-11 are 1.1mm gapped. I was told bkr6e is 0.8mm gap. Haven't been able to verify this though.

    And yes I'm pretty much using the same electronics because I only got the engine. The only 'new' ignition component is the distributor.

  8. #23
    30DET... The only way. Carport Converter Kyosho's Avatar
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    Default Re: won't rev above 4000rpm

    The distributor is on setup correct? (Not a tooth out?)

    Check your timing, I've had issues nearly the same if the timing is too far advanced...
    Also, I'd probably look at swapping to the other dizzy just as a check...
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  9. #24
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    Default Re: won't rev above 4000rpm

    Quote Originally Posted by hunging
    The bkr6e-11 are 1.1mm gapped. I was told bkr6e is 0.8mm gap. Haven't been able to verify this though.

    And yes I'm pretty much using the same electronics because I only got the engine. The only 'new' ignition component is the distributor.
    I can verify that, I have measured them.
    Your above statement is correct:

    bkr6e-11 are 1.1mm gapped
    bkr6e are 0.8mm gapped

    I use them in my 2jzgte.
    I also must say changing plugs makes the world of difference if they are all fowled up.

  10. #25
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    Default Re: won't rev above 4000rpm

    Did two things today. Changed the distributors around and took the injectors out.

    For some reason the gen2 distributor didn't fire up with the gen3 ignitor. But after getting it to run with the gen2 ignitor it still had the same problem.

    Injectors sprayed fine and the o-rings looked fine so nothing was done to them.

    I'm beginning to run out of ideas. Please help!!

  11. #26
    Junior Member Too Much Toyota oldcorollas's Avatar
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    Default Re: won't rev above 4000rpm

    Quote Originally Posted by hunging
    For some reason the gen2 distributor didn't fire up with the gen3 ignitor. But after getting it to run with the gen2 ignitor it still had the same problem.
    are they the same reluctor?

    did you try to swap the wires around?

    or.. at least put the dizzy on a scope and see if it goes up or down in the first part of the wave (so to see what direction the slope in the middle is..)
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  12. #27
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    Default Re: won't rev above 4000rpm

    AFAIK they are the same. The wires are correct according to the BGB. I guess I can confirm it by checking connectivity of the wires with a multimeter. I don't have a scope to look at the waves but I think trying two distributors should be pretty conclusive that the problem is not there.

  13. #28
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    Default Re: won't rev above 4000rpm

    I've gone back to the drawing board and have started looking at the ignition wiring of gen2 and gen3. These are the apparent differences I've found so far:

    1. For the gen3 power to the ignitor and coil is split at the relay.
    2. The positive wire to the coil is grounded (circled)

    Gen 2:


    Gen3:


    The 'diode' in the gen3 diagram is labelled 'noise filter (for ignition system)' in the ST205 BGB.

    Does that mean I'll need to splice the positive wire going to the coil and ground it? Wouldn't that short out the power to the coil?

  14. #29
    Hopefully soon a 5S-GTE Chief Engine Builder MWP's Avatar
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    Default Re: won't rev above 4000rpm

    Quote Originally Posted by hunging
    The 'diode' in the gen3 diagram is labelled 'noise filter (for ignition system)' in the ST205 BGB.

    Does that mean I'll need to splice the positive wire going to the coil and ground it? Wouldn't that short out the power to the coil?
    Its not a diode, its a capacitor... or "condenser" as its called in automotive electronics.
    Helps to stop ignition noise interfering with other electronic systems & radios.

  15. #30
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    Default Re: won't rev above 4000rpm

    Just a quick update: I've tried switching the G1 and G2 pins on the ecu just to confirm I haven't got them around the wrong way. The engine fired up with a CEL which went off after about a second or so. The engine feels slightly more sluggish but it's still doing the same thing misfiring above 4000 rpm.

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