How do you adjust timing on a 99 Chevy 5.7 liter suburban Ditributor has been removed?

You can't adjust the timing on a 1999 Chevy Suburban 5.7L with the distributor removed. That engine uses an electronically controlled ignition system, meaning the distributor's role in controlling ignition timing is gone. The Engine Control Module (ECM) handles all timing adjustments based on various sensor inputs.

There's no mechanical timing adjustment to be made. Any timing issue will require diagnostic work to find the cause, which could include:

* ECM Problems: A faulty ECM is a possibility.

* Sensor Issues: Problems with the crankshaft position sensor (CKP), camshaft position sensor (CMP), or other sensors can disrupt timing.

* Wiring Problems: Damaged or corroded wiring can also interfere with the system.

* Other Ignition Components: Issues with the ignition coil, ignition module (if applicable), or spark plug wires can cause misfires which might *seem* like a timing problem.

If you're having timing-related issues (like misfires, rough running, poor performance), you need to use a scan tool capable of reading OBD-II codes to diagnose the problem. Taking it to a mechanic or auto parts store for a scan is the best first step. Trying to manually adjust timing on this type of system is impossible and could damage the engine.