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How to: 500 efi timing
i had the chance to adjust timing on carbed engine pretty often but i was told there is something else to do for an efi engine so it does not move advance while trying to change timing so! what needs to be disconnected? Or jumped? Or whatever? before playing with distributor? this must not be rocket science right? |
It can be done with the scan tool, otherwise in the DLC connector, jumper the black and black and white wires, this puts it in base timing mode, run it up to 1500 rpm+ and adjust |
thanks
what should be the degre at 1500? 33? or 34? I always used that on 350 cu v8 |
set it at 8* in base mode and let the ecm do the rest
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will do !
Thanks ! |
If you don't have a scan tool or jumper plug, you can go the high tech way and use a paper clip. Jump the A and B terminals in the data plug. That will put it in base timing mode. The timing will not move now no matter what rpm you put the engine at. Set it to 8*. It doesn't matter what rpm you put the engine, but the timing will be more steady if you raise it to about 1700-1800 rpm. At idle, it will move around some and make it difficult to get an exact reading due to the slack in the timing set, distributor to cam gear play, etc. If you bring it up, the timing will stabilize and allow you to get a good reading.
It's very important to set it at exactly 8*. If you set it at 10*, you will have 2* more timing everywhere. Same applies if it's lower than 8*. The ECM has no way of knowing where you set it. It just uses the 8* as a reference. Eddie |
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Originally Posted by sb
(Post 4632536)
paper clip tech tip:
Obviously black paper clips are coated in plastic, so you have to grind the coating off the ends to make the metal exposed. But many people don't realize bare metal paperclips are actually coated in clear plastic, so make sure to grind the plastic off it's ends and verify you are down to metal. |
Did that and worked fine! Thanks everyone! |
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