EGTs: Front and Rear differentials
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EGTs: Front and Rear differentials
I cross posted this from the 3rd gen forum because I believe the question applies to all generations.....
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I have both pre and post turbo EGT Gauges. The pre-turbo gauge measure both the EGTs at both the front and rear exhaust manifold. Up til last night, I was getting nearly identical readings from the front and rear preturbo gauges. All of a sudden I was getting 200 degree C lower temps from the front gauge. No other symptoms occurred (engine temps normal, performance excellent, no smoke, no noise).
I tried to compile a list of possible problems and would appreciate any suggestions.
1. coolant leak in front chamber ---- Unlikely--no white smoke
2. exhaust manifold gasket leak (sucking air into mainfold) ---- Unlikely--No associated exhaust noise.
3. stuck open injector in front chamber--- unlikely--AFRs are consistent with precondition readings.
4. spark plug failure---unlikely---AFRs and performance are the same as before.
5. EGT sensor bad......will check by swapping sensors between chambers.
6. EGT gauge failure----will check by swapping inputs to the gauge.
If you have any suggestions for alternative causes or disagree with my analysis of what may not be likely, I would appreciate any input.
Jeff
++++++++++++++++++++++++++++++++++++++++++++++++++ ++++++++
I have both pre and post turbo EGT Gauges. The pre-turbo gauge measure both the EGTs at both the front and rear exhaust manifold. Up til last night, I was getting nearly identical readings from the front and rear preturbo gauges. All of a sudden I was getting 200 degree C lower temps from the front gauge. No other symptoms occurred (engine temps normal, performance excellent, no smoke, no noise).
I tried to compile a list of possible problems and would appreciate any suggestions.
1. coolant leak in front chamber ---- Unlikely--no white smoke
2. exhaust manifold gasket leak (sucking air into mainfold) ---- Unlikely--No associated exhaust noise.
3. stuck open injector in front chamber--- unlikely--AFRs are consistent with precondition readings.
4. spark plug failure---unlikely---AFRs and performance are the same as before.
5. EGT sensor bad......will check by swapping sensors between chambers.
6. EGT gauge failure----will check by swapping inputs to the gauge.
If you have any suggestions for alternative causes or disagree with my analysis of what may not be likely, I would appreciate any input.
Jeff
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