01-23-2018, 10:17 PM
runs perfectly hot, engine, up hills. flogged hard runs great.right?
sparkplugs ok, spark wires, cap rotor fresh, not 20 years old. gapped at 0.028" never used out of box at 0.045" ever.
spark if first ,if engine itself is ok, spark needs to be strong cold , its runs richer cold so may need very good spark.
lean sure, all MAF engines can go lean , with unmeter air leaks. or just a dirty maf, clean it, with maf cleaner from 8inches away, not direct blasted.
i cant watch the video, im in Yucatan mex. now. diving'
when hot , idle at 800 ?rpm and holds there. shifted to drive, (AT OR MT BOX)? OR TURN ON BLOWER, AND HEAD LIGJTS, does RPM still hold 800 rpm hot.
the surge can be 2 things, lean surge, or the ISC cant control idle speeds so ISC surges madly to get 800rpm but idle is not active cold
The cold surge is misfiring or way too lean. (or extreme rich spark misfiring)
that 717 is hot failure not cold. its hot closed loop failure to regulate fuel rates.
the front 02 sensors can be bad. this old, easy. just front, rear is only for CAT testing,
clean maf, spark good full tuneup, the 02 , and last look for vacuum leaks.....harder... last..
sparkplugs ok, spark wires, cap rotor fresh, not 20 years old. gapped at 0.028" never used out of box at 0.045" ever.
spark if first ,if engine itself is ok, spark needs to be strong cold , its runs richer cold so may need very good spark.
lean sure, all MAF engines can go lean , with unmeter air leaks. or just a dirty maf, clean it, with maf cleaner from 8inches away, not direct blasted.
i cant watch the video, im in Yucatan mex. now. diving'
when hot , idle at 800 ?rpm and holds there. shifted to drive, (AT OR MT BOX)? OR TURN ON BLOWER, AND HEAD LIGJTS, does RPM still hold 800 rpm hot.
the surge can be 2 things, lean surge, or the ISC cant control idle speeds so ISC surges madly to get 800rpm but idle is not active cold
The cold surge is misfiring or way too lean. (or extreme rich spark misfiring)
that 717 is hot failure not cold. its hot closed loop failure to regulate fuel rates.
the front 02 sensors can be bad. this old, easy. just front, rear is only for CAT testing,
clean maf, spark good full tuneup, the 02 , and last look for vacuum leaks.....harder... last..
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