gsexxx
10+ Year Contributor
- 166
- 0
- May 4, 2012
-
Minneapolis,
Minnesota
Hey guys, I have a question regarding ignition timing. I dialed in my 1650cc injectors and at idle everything looks good except my timing varies from 7*-17* at idle. Before dialing in my injectors I verified that my ignition base timing was at 5* using a timing light. Now, when I attempt to check timing and check the ground timing box in link, the car dies.
When I start the car with the timing grounded, the car dies as soon as the front o2 cycles. I have read that it is normal for timing to bounce around during idle but 17* seems a little high. I have also read that the car will run rough when grounding timing through link, but it shouldn't die.
Has anyone experienced this issue? Thanks in advance.
When I start the car with the timing grounded, the car dies as soon as the front o2 cycles. I have read that it is normal for timing to bounce around during idle but 17* seems a little high. I have also read that the car will run rough when grounding timing through link, but it shouldn't die.
Has anyone experienced this issue? Thanks in advance.
anyways as far as know 1650cc injectors would require like -72% (450/1650-1=72%) and dead time around 450 but Ive seen that to be not true. Ive ran 1550cc injectors before and I had my global set at -62% but according to the formula and the calculator in the ECMlink it should have been -70% so as long as your fuel trims are good and your airflow/rev is relatively close then you can leave the global alone. One thing Ive learned that sometimes you cant have both global and airflow/rev set to where you think it should be and sometimes its one or the other. As long as your car runs good where things are set then I wouldnt worry about it too much. BTW what kind of injectors are those and are you running a MAF sensor or SD? Do you have bigger then stock cams, if so whats your vacuum at idle?
