Member Since: 12 Jul 2010
Location: USA
Posts: 956
Temp sensor, purge valve and leak detection pump circuit
Trying to sort out some issues on my Disco with the V8. 151k miles. It's getting codes for the coolant temp sensor, the purge valve sticking open and closed and high voltage in the leak detection pump circuit as well as running rich on both banks. It usually drives fine and the CEL is intermittent, but sometimes after getting gas it bucks really bad. Sometimes it bucks even if it hasn't just been filled, so there may or may not be a correlation.
I'm having trouble connecting the dots. I'm thinking of 3 different scenarios...
1. Coolant temp sensor is causing all the issues.
2. Purge valve sticking is causing the leak detection pump codes and it to run rich, and the leak detection pump is doing its job. Not sure where the coolant temp sensor fits in the mix.
3. Leak detection pump is bad and causing the purge valve to stick, and causing the richness.
I could be way off base. Really would appreciate some help on this one! Many thanks.17 Discovery 5 HSE Si6, Fuji White on brown | 07 LR3 SE 4.4 Java Black on Alpaca
Club V8/Club OCD
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