1979-1993 & 94 Conv [Subscribe to Daily Digest] |
O2 sensor/A-F mixture. Start there. Clear your stored codes, and then see if the same CEL codes get regenerated. Test your O2 sensor as thoroughly as possible (research archives for how-to, etc.), and/or replace if in doubt. Several ~$35 Bosch PNs will work fine. Solder & stagger splices. Not uncommon for old sensor to be seized: soak w/PB, Kroil, what have you. Use tight 7/8" (I think)
Also ck all O2 sensor support wiring, per schematic, going thru the 6-pin connector (RF wheel), etc., i.e., trace/test all 3 O2 sensor wires, away from sensor, to their respective terminations, including a visual ck (as much as possible) for rubbed off insulation (one goes to grnd, one to ECU, etc)
If no joy, then:
Did you get a ground at AMM harness connector #4 w/ignition on?
Does fuel pressure restore quickly after pinching/releasing fuel delivery line?
Can't recall if we already mentioned these:
ck both your NTC/coolant temp sensor and TPS resistance values (per Bentley & prob in Haynes). Don't just spot ck or ck at extremes, but rather ck at several temps & throttle positions.
both LH system and fuel pump relays good?
you replaced the AMM, IIRC? Doesn't guarantee good - sometimes takes a 3rd unit - but let's assume good for now
ck that air filter is reasonably clean/air intake not partially blocked
Still other possibilities:
AIC can be can be acting up, operating at non-idle (when it shouldn't be)
partially clogged and/or poor fuel injector spray pattern
if you have a timing light, altho timing is automatic, confirm that timing mark is very steady (to ck for a worn distributor)
ignition key shorting out
the ignition amplifier had a separate relay MY 86&87, but not other MYs, AFAIK
posted by 63.107.25...
, Sun, 2 Mar 2003 21:45:59, Tue, 4 Mar 2003 22:57:53
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