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1988 EA82 SPFI Running Lean


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My 88 GL Wagon has some fuel system issues, and hesitates and drops in rom under load, especially when the engine is cold. I replaced the fuel filter, which seemed to help, but after I ran the car out of gas the other day it got worse again, and replacing the filter again didn't help. I replaced the spark plugs today and they are all white, powdery, and burnt,so the car is clearly running lean. Most of my experience is with carbureted engines, so I was hoping you guys had some good tips for where to start on figuring this out.

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Metered-air leak (vacuum leak or leak in the boot between MAF and throttle body)?

 

In my (limited) experience, CTS issues either throw check-engine codes (open-circuit or too much resistance) or make the engine run richer.  Typical failure mode is corroded connectors and wires.

 

Running out of gas should not make any difference regarding crud:  The tank's fuel outlet is fixed and located at a the bottom of the tank, so any crud would find itself there even with a full tank.  (Except for ping-pong balls.)

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