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Catalog #70080, #70081, #70082, #70083
Brochure No. 63-0312
©2008 Edelbrock Corporation
Rev. 07/08
Page 30
Symptom #5… Engine detonates mildly when system is activated.
1. Excessive ignition timing.
a. Check timing.
i. Reduce timing in 2-degree increments for every 50 hp.
2. Inadequate octane fuel.
a. Verify what gasoline you use.
i. Use higher-octane fuel.
3. Spark plug heat range too high.
a. Verify what heat range the spark plug is, and how it functions in a high load, high performance
application.
i. Install a performance spark plug.
ii. Reduce spark plug heat range.
4. Too little fuel flow.
a. Check pressure and flow.
i. Correct fuel flow to proper specification.
5. Too much nitrous flow.
a. Verify the size of the nitrous jet.
i. Install the proper nitrous jet.
b. Check bottle temperature and pressure.
i. Ensure before every nitrous usage that you only use nitrous when the temperature and pressure of
your bottle are correct.
Symptom #6… Engine detonates heavily when system is activated.
Inadequate fuel delivery due to:
1. Plugged fuel filter.
a. Inspect fuel filter.
i. Clean or replace filter.
2. Crimped fuel line.
a. Inspect fuel line.
i. Replace crimped line.
3. Weak or inadequate fuel pump.
a. Install fuel pressure gauge. Run engine under load at wide-open throttle, with system activated.
i. Repair or replace fuel pump.
ii. Install nitrous dedicated fuel supply.
Symptom #7… High RPM misfire when system is activated.
1. Excessive spark plug gap.
a. Inspect spark plugs.
i. Set plug gap at 0.030 – 0.035 inch.
ii. Contact the manufacturer of your plugs for more information.
2. Weak ignition/ignition component failure.
a. Inspect ignition components.
i. Replace worn components.
ii. Upgrade ignition system to high performance high load capable ignition components.