Professional automotive forum for discussion of the theory of operation for any automotive system or component. Discussions include electrical and electronic theory, engine propulsion theory, fuel system theory, ignition systems theory, and much more. This forum is for experienced automotive repair professionals only, membership required.
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| Dual thermostats. Purpose and diagnostics 06/28/2025 in the Technical Theory Forum We have been seeing some cars with dual thermostats. I have not yet understood their purpose. Even worse, how to diagnose them. If I find a circulation problem I replace both thermostats. Can you help me understand the design, and any tips on determining ... | ||
| PCM pid data chart 06/03/2025 in the Technical Theory Forum [Driveability: 21 Jeep Cherokee Limited 3.2L] Can not ID correct vehicle here. Is actually Grand Chero w/ 3.6L. I suspect I have a defective fuel tank pressure sensor but have no baseline info on Mitchell (ShopKey) about what FTPS pid should read koeo an... |
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