Here are the most likely culprits when your 1996 Suburban 5.7L won't start without starter fluid:
* Fuel Pump: This is the most common problem. The fuel pump might be weak, failing, or not getting power. You'll want to check the fuel pressure. A mechanic can test this easily. Listen for the pump whirring when you turn the key to the "on" position (before cranking). A weak whir or no whir indicates a failing pump.
* Fuel Filter: A clogged fuel filter restricts fuel flow. This is a relatively inexpensive and easy part to replace.
* Cranking System: While less likely given the starter fluid works, ensure your battery is strong and the starter motor is functioning correctly. A weak battery or a failing starter won't crank the engine fast enough to ignite the fuel even if it's being delivered.
* Fuel Injectors: A clogged or failing fuel injector could prevent fuel from reaching the cylinders. Diagnosing this requires a more specialized scan tool.
* Computer/Sensors: Problems with the Engine Control Module (ECM), crankshaft position sensor, or other sensors can prevent the engine from starting. These require diagnostics with a scan tool.
What you should NOT do:
* Keep using starter fluid: This is a temporary fix at best and can seriously damage your engine. It's a highly flammable substance.
What you SHOULD do:
1. Have the fuel pressure checked: This is the most critical step. A mechanic can do this quickly.
2. Replace the fuel filter: This is a cheap and easy fix, and it's a good preventative maintenance item anyway.
3. Get a professional diagnostic: A mechanic with a scan tool can read diagnostic trouble codes (DTCs) from the ECM which will pinpoint the problem.
Ignoring this problem will likely lead to further damage and more expensive repairs. Get your Suburban to a qualified mechanic as soon as possible. Continuing to use starter fluid is risky and not a solution.
