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Will replacing an electronic spark control module distributor with a bypassed standard one help 85 Chevy Van 305 V8 that cranks but will not start?

Replacing an electronic spark control module distributor with a bypassed standard distributor is highly unlikely to solve a cranking-but-not-starting problem in a 1985 Chevy Van with a 305 V8. While it's possible the electronic ignition system is faulty, bypassing it isn't a simple fix and probably won't work. It introduces a lot more problems than it solves.

Here's why:

* Compatibility Issues: A standard distributor isn't directly compatible with the electronic ignition system wiring. You'd need to significantly modify the wiring harness, potentially causing more problems.

* No Spark Control: The electronic ignition module controls the spark timing, making it more efficient and reliable than a purely mechanical system. Bypassing it would result in drastically poor ignition timing (if you even get spark at all), likely preventing the engine from starting.

* Other Potential Problems: A cranking-but-not-starting issue has many possible causes, including:

* Fuel delivery problems: Clogged fuel filter, fuel pump failure, faulty injectors.

* Ignition problems (beyond the distributor): Faulty ignition coil, bad wires, insufficient battery power.

* Compression issues: Low compression in one or more cylinders.

* Engine sensor issues: A variety of sensors (crankshaft position sensor, etc.) are crucial for starting and running.

What to do instead:

1. Check for spark: Use an inline spark tester to confirm if you have spark at the spark plugs. If not, focus on the ignition system (coil, wires, distributor cap/rotor). A failing coil is a common culprit.

2. Check for fuel: Verify fuel is reaching the engine. Check the fuel pressure (if you have a fuel pressure gauge), listen for the fuel pump to prime, and inspect the fuel filter for clogs.

3. Test the ignition module: This is much more likely the culprit if your distributor is electronic. Have it tested. A simple swap with a known good module from a similar vehicle is your best initial step if you can find one.

4. Check the computer (ECM): On these vehicles, it's possible the ECM has a problem and the signals it's sending to the ignition are faulty, interfering with starting. This requires a more advanced diagnostic.

5. Check cranking speed: If the engine cranks slowly, you have a weak battery, bad connections, or a faulty starter.

6. Consider professional help: If you lack experience with automotive diagnostics, a qualified mechanic can accurately diagnose and fix the problem much more efficiently and safely.

Trying to bypass the electronic ignition system is a risky move that likely won't work and could damage other components. Focus on systematically checking the other aspects of the ignition and fuel systems first.