| | | quote | Originally posted by FrugalFiero:
Keep all your old sensors, cause they are probably good! ......
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Not.
The TPS is a moving part and wears considerably. 30-50,000 miles is allot for this item.
O2 sensors are only rated for abotu 30,000 miles.
MAT gets cooked pretty easily by even one backfire. Any error from the MAT can and usually will cause problems and often will not cause error codes.
ECT usualy holds up pretty well. The connector is pretty well sealed up so the terminals aren't prone to rot lie the older ones did. The sensor doesn't go bad often... usually the older style ones rotted out the terminals because they wer poorly sealed.
MAP uses a "solid state" pressure transducer that can and does go bad. It can become inacurate before it dies. There are ways to test this sensor that usually expose problems easy enough.
Most sensors can be bad and NOT throw any DTCs in the ECM at all. I've seen this happen first hand more than once. Most sensors can fail slowly and screw up the engine long before they register dead and throw codes. They can also throw false codes that point to other things being wrong. NEVER trust a DTC! Especially on these old OBD1 systems.
Now should you reaplace all them...
That's up to the owner. I did. Not sorry I did either. The MAT TPS ECT MAP and CPS have all been replaced. If you are planning to keep the car a long time then it's fairly cheap insurance against a problem.
Do the sensors have to be GM? No but they have to be a good brand. ACDelco is GM but you can get it from many parts stores and pay less than dealer prices. BWD (Borg Warner) and Bosch are both good.
EGR is pricey but this engine will give you headaches if that thing isn't right. ACDelco still carries the OE on as far as I know. (At least acording to the image on their web site.) A worn out EGR is a common source of backfires when you punch the gas. I have an OE EGR that seems to work right most of the time. Every so often it lets me know just how worn it really is. (Mine has 170,000 on it...) In many cases you can just clean the OE EGR and put it back on. New EGR gaskets are about a dollar. Always use a new gasket.
Don't buy "universal" EGRs that come with metering washers unless that is your only choice. These things all suck no matter what brand they are. I've seen these POS items croak in as little as 18 months more than once.
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