Question about Denso 1991 GMC K1500 Sierra XC 4.3L Remanufactured Alternator

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Why does my truck stall when I plug in the map sensor

Timing and such are good, ran clean prior to total shut down.

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Sensor is bad and it is giving the wrong fuel/air mixture info to the computer.

Posted on May 29, 2014

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Usually a problem with a dirty throttle body or a faulty idle air control valve. The computer controls idle speed by regulating how much air enters the intake thru the valve.

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I have a 98 Electraglide Classic. The problem I am having is intermittent. While riding my ignition system will shut down, no rough running or missing, just total stall. Most of the time it will start back...


Hi Sparkypickle, and the usual suspects are:
1. Severely discharged or damaged battery.
2. Loose, corroded or broken battery cable.
3. Alternator not charging or below normal rates.
4. Failed ignition coil, ignition/electronic module.
5. Failed CKP, CPS, CMP, MAP, TPS, or BAS sensor.
6. Faulty ignition switch.
7. Water or dirt in fuel system, carburetor or filter.
8. Fuel tank vent system plugged or gas cap not venting.
9. Fuel tank empty.
10. Fuel valve vacuum line broken or carburator vent line closed off.
11. Restricted, blocked or kinked fuel line.
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85 Citation stalls at idle after reaching operating temp


Are you sure this has a carburetor? By 85 most were fuel injected. Did you check the gap on the plugs? Clean the threads and seat? Map sensor maybe bad.

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My engine shuts off while I am driving and then takes about 20 minutes before it will start back up. It also will start up and then shut off before I can get moving. Finally when I am driving sometime it...


the very 1st thing for you to do is have the OBD 2 electronic engine control system tested for trouble codes, whenever you have a stall like this there is almost always a code that is stored for the problem, which in your case will most likely be a crankshaft position sensor, but do the test.

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