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‘87 245 w/ M47 Idles Fine but dies when gas pedal applied 200 1987

posted by  83GLT on  Wed Jun 28 09:18 CST 2023
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last visit: Fri Jun 13 10:56 CST 2014
[RELATED]

Have been scratching my head and using Search to find answers here and at other forums. Leaving me with more questions than answers!

1987 245 with M47 about 250k miles, reasonably well maintained.

Symptoms: Car starts and idles without issue. While not in gear, the moment the gas pedal is touched to apply throttle, the car shuts off. There is no stumbling/stuttering. It turns off like a switch.

These symptoms persist in spite of the following diagnostics:

- confirmed working fuel pump relay/main pump
- disconnected the MAF (and cleaned it) without any change in symptoms
- cleaned throttle body - confirmed “clicking” as butterfly moves - cleaned TPS contacts and tested good with ohm meter
- cleaned/tested idle air control valve
- checked for/and found holes in the accordion air intake hose - temporarily repaired them with tape while waiting for replacement to arrive
- checked for other vacuum hose leaks - none found
- checked grounds, all show continuity

Symptoms persist. Car will start easily and idle fine (slightly high RPM/1000 or so) but will die/shut off the moment the gas pedal is depressed. Turning the throttle linkage by hand can raise RPM as if the car were accelerating, so the stall only occurs when pressing the gas pedal.

Any help is MUCH appreciated!!





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