Please check my logic and troubleshooting procedures and suggest something that I might have missed:Low (safety) boost this last summer at about 7 psi (using stock gauge). As the weather got colder this fall I noticed that in the mornings the boost increases to about 9.5 psi but later droppes to 7 psi as the engine and weather got warmer (40+ F). Last night after the engine cooled off (almost cold) and after resetting the codes, the ECU displayed code 55. This morning was in the 30’s F and I took her for a ride (I did not check the codes before I drove). Very peppy at 9+ psi. Stopped the car and checked codes to discover code 34. Reset the codes, immediately started the car, drove it and could only get 7 psi. Checked the ECU and it was still was at code 34. I checked the wiring to detonation sensor - infinite resistance on both wires. Checked wires to the ECU and one wire was grounded and the other had 560k ohms. Conclusion: Intermittent connection of the wire to the detonation sensor affected by engine temperature. Options:
1. Replace detonation sensor and/or associated wiring harness
2. Locate a new detonation sensor somewhere else on the engine with increased risk
3. Bypass the detonation sensor and accept the high risk I guess I should check the resistance in the wiring to the detonation sensor when the engine is cold to confirm that temperature affects the connection, but I think I have enough information to support the conclusion. Am I missing something? Thanks in advance!
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08:54:02 11/11/11
