Quote:
Originally Posted by A26B
The common failure of injectors for 90~92 MY is due to ethanol. Most pump fuel in the US contains 10~15% ethanol blended with gasoline. The solenoid windings in the 90~92 injectors are not compatible with ethanol, which breaks down the varnish insulation, allowing short(s) in the windings. The breakdown is evidenced by low resistivity and misfires.
Cleaning does nothing for the problem. Flow testing will cost 50% or more of the cost associated with new injectors and also offers nothing in return to combat the problem. The correct solution is to replace all 16 injectors with new ones (not from GM or ACDelco old stock).
So, it's not a "just in case" but more like a matter of when, unless you are able to use only 100% gasoline.
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Thanks for the detailed answer, exactly what I was looking for. Makes a lot more sense, and in that case will probably go ahead and replace them while I'm in doing everything.
So just so I have an updated running list:
Oil Change - Driven HR4 10w30 and Wix filter
Trans Fluid - Castrol Supercar 10w60
Diff Fluid - Valvoline 75w90 Synthetic + ACDelco limited slip additive
Spark Plugs - ACDelco 41-602 gapped to 0.035"
Air filter
Fuel Filter
Replace brake and master cylinder hydraulic fluid (syringe method)
Clean PCV and throttle body
Check brakes
Replace fuel injectors (16) - Intake Plenum Gaskets and feed & return block orings
Serpentine Belt
Cam cover vent filter