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timing 4.3 with thunderbolt ignition

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  • timing 4.3 with thunderbolt ignition

    I had to change intake manifolds and now i have to check the timing. Can I simply check the timing at idle or are there different procedures with this ignition. Thanks

  • #2
    Re: timing 4.3 with thunderbolt ignition

    Originally posted by tcline11 View Post
    I had to change intake manifolds and now i have to check the timing. Can I simply check the timing at idle or are there different procedures with this ignition. Thanks
    If it's the thunderbolt 4 ignition, you have to bypass the computer advance by grounding the purple wire lead at the distributor. Set timing and don't forget to take the grounding wire off.
    Sometimes it's more important to be human, than to have good taste. ~Brecht

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    • #3
      Re: timing 4.3 with thunderbolt ignition

      Originally posted by mpdive View Post
      If it's the thunderbolt 4 ignition, you have to bypass the computer advance by grounding the purple wire lead at the distributor. Set timing and don't forget to take the grounding wire off.
      Ayuh,... With T-Bolt IV, ya just hook up the timing light, 'n shoot....

      T-Bolt V needs the jumper wire to set it to base mode, then time it...

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      • #4
        Re: timing 4.3 with thunderbolt ignition

        I stand corrected. It,s the ignition amplifier that supplies advance on the 4. The 5 is grounded for base timing. I was confused for a second ,Thanks Bond-o
        Sometimes it's more important to be human, than to have good taste. ~Brecht

        Comment


        • #5
          Re: timing 4.3 with thunderbolt ignition

          Thanks for the quick response. I have the TB 5 ignition but it doesn,t have a purple wire on the distributor it ha s a black going to ground and 1 white with red stripe and 1 white with green stripe The only purple wire is from the coil. what do i jump and how.

          Thanks again

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          • #6
            Re: timing 4.3 with thunderbolt ignition

            It's not on the distributor, look up next to the carb on the starboard side. Why is it newbies never seem to think that a simple think like the year has any impact on their engine? All 4.3's are not created equal.

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            Don S.


            Please, no PM's (Private Messages) regarding boat/engine problems.
            That is what the forums are for.
            Only forum/moderator issues will be answered in PM's.

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            • #7
              Re: timing 4.3 with thunderbolt ignition

              I dont have this ignition, mine is IV, but... Manual says for V there is a purple and white wire in the harness, with a spade conector, between the ICM and KCM. Run to engine ground with jumper and this makes it run on base timing. Start and use timing light as usual.

              Note: it also states that the carb shoud be adjusted with the engine runing on base like this as well.

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              • #8
                Re: timing 4.3 with thunderbolt ignition

                Originally posted by joewithaboat View Post
                I dont have this ignition, mine is IV, but... Manual says for V there is a purple and white wire in the harness, with a spade conector, between the ICM and KCM. Run to engine ground with jumper and this makes it run on base timing. Start and use timing light as usual.

                Note: it also states that the carb shoud be adjusted with the engine runing on base like this as well.
                Thanks for the info I will try that in the morning

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                • #9
                  Re: timing 4.3 with thunderbolt ignition

                  Originally posted by Don S View Post
                  It's not on the distributor, look up next to the carb on the starboard side. Why is it newbies never seem to think that a simple think like the year has any impact on their engine? All 4.3's are not created equal.

                  [ATTACH=CONFIG]117005[/ATTACH]
                  thanks for the info. sorry for being a newbie

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                  • #10
                    Re: timing 4.3 with thunderbolt ignition

                    When I checked the timing when I grounded the purple and white wire and set it at 10 deg as it says to on the top of the carb. when I unhooked the wire and checked the timing again it was still at 10 deg. Is this correct or should it have changed. Also it idles just fine but when it gets to about 1900 rpm it starts to run bad and backfires sometimes. What else could be wrong and what should I check next. I also checked the pos side of the coil with the key on and it has the same voltage as the battery. Thanks

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                    • #11
                      Re: timing 4.3 with thunderbolt ignition

                      Did you set it into timing mode and take it out of timing mode at the right time?
                      Did you read and follow the procedure I posted earlier?
                      Don S.


                      Please, no PM's (Private Messages) regarding boat/engine problems.
                      That is what the forums are for.
                      Only forum/moderator issues will be answered in PM's.

                      Comment


                      • #12
                        Re: timing 4.3 with thunderbolt ignition

                        Originally posted by Don S View Post
                        Did you set it into timing mode and take it out of timing mode at the right time?
                        Did you read and follow the procedure I posted earlier?
                        I read the instructions and the only thing i couldn't figure out is where it says to remove jumper wire from timing terminal. Is that the same as the purple and white wire for the ground if it's not the instructions never say hook up any jumper wire from the timing terminal. If it's a seperate step to do can you please explain. The engine is a 2003. Thanks

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                        • #13
                          Re: timing 4.3 with thunderbolt ignition

                          Read item 8, especially the bold part that says important.
                          Don S.


                          Please, no PM's (Private Messages) regarding boat/engine problems.
                          That is what the forums are for.
                          Only forum/moderator issues will be answered in PM's.

                          Comment


                          • #14
                            Re: timing 4.3 with thunderbolt ignition

                            Originally posted by Don S View Post
                            Read item 8, especially the bold part that says important.
                            I read #8. I'm talking about #7

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                            • #15
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                              Re: timing 4.3 with thunderbolt ignition

                              Step 8 seems to restate what the second part of step 7 says. And then again puts it in Bold
                              Does the timing move as rpm comes up?
                              Why was this torn apart to begin with?

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