starting problem - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 3 (permalink) Old 01-13-2010, 03:27 AM Thread Starter
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starting problem

ok guys my dad has a 99 3500 and it has gotten to where the wait to start light doesnt always come on when you turn the key and the truck will not start till it does hot or not. it will only spin over till the light comes on then fire right off. any ideas tried swaping relays around no luck. any help is much appreciated and sorry for the long post.

88 F-350 Centurion 4x4, 7.3, C-6, BW1356 T-case, Ats Turbo, Straight pipe, Custom air intake, home made rear bumper, 35s, Kenwood head unit

96 Dodge 2500 4x4 5 spd, luk pro gold clutch, air dog 150 lift pump, 4k gov springs, afc mods, 0 plate, 140hp inj, bored .040 over, cooler tubz intake, bhaf, 64/12/65, 4in turbo back to two home made 6in stacks, 20* timing
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post #2 of 3 (permalink) Old 01-13-2010, 02:40 PM
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A wait-to-start indicator is standard equipment on all instrument clusters, but is only functional in vehicles equipped with an optional diesel engine. The wait-to-start indicator is located near the lower edge of the instrument cluster overlay, to the right of center. The wait-to-start indicator consists of a stenciled cutout of the text "WAIT TO START" in the opaque layer of the cluster overlay. The dark outer layer of the overlay prevents the indicator from being clearly visible when it is not illuminated. A red lens located behind the cutout causes the "WAIT TO START" text to appear in red through the translucent outer layer of the overlay when the indicator is illuminated from behind by a Light Emitting Diode (LED) that is soldered onto the instrument cluster electronic circuit board. The wait-to-start indicator is serviced as a unit with the instrument cluster.

The wait-to-start indicator gives an indication to the vehicle operator when the diesel engine intake air heater is energized in its preheat operating mode. This indicator is controlled by a hard wired input to the instrument cluster from the Engine Control Module (ECM) . The wait-to-start indicator Light Emitting Diode (LED) receives battery current on the instrument cluster electronic circuit board through the fused ignition switch output (st-run) circuit whenever the ignition switch is in the ON or Start positions; therefore, the lamp will always be OFF when the ignition switch is in any position except ON or Start. The indicator LED only illuminates when it is switched to ground by the input from the ECM. The ECM will turn ON the wait-to-start indicator by pulling the wait-to-start indicator driver circuit to ground each time the ignition switch is turned to the ON or Start positions. The indicator then remains illuminated until the ECM detects that the air within the intake manifold is the proper temperature to ensure reliable and efficient engine starting, until the ECM detects that the engine is running, or until the ignition switch is turned to the OFF position, whichever occurs first.

The ECM continually monitors the intake manifold air temperature sensor, the Manifold Absolute Pressure (MAP) sensor, and many other vehicle conditions to determine when the wait-to-start indicator should be illuminated. For proper diagnosis of the wait-to-start indicator, the ECM, or the inputs the ECM uses to control the wait-to-start indicator operation, a DRBIII scan tool is required. Refer to the appropriate diagnostic information.

The intake manifold air temperature sensor is installed into the rear of the intake manifold with the sensor element extending into the air stream.

The IAT provides an input voltage to the Engine Control Module (ECM) indicating intake manifold air temperature. The input is used along with inputs from other sensors for intake air heater element operation, for engine protection, fuel timing and fuel control. As the temperature of the air-fuel stream in the manifold varies, the sensor resistance changes. This results in a different input voltage to the ECM.





The MAP sensor is installed into the rear of the intake manifold.

The MAP sensor reacts to air pressure changes in the intake manifold. It provides an input voltage to the Engine Control Module (ECM) . As pressure changes, MAP sensor voltage will change. The change in MAP sensor voltage results in a different input voltage to the ECM. The ECM uses this input, along with inputs from other sensors to provide fuel timing, fuel control and engine protection. Engine protection is used to derate (drop power off) the engine if turbocharger pressure becomes to high.


Check the MAP,IAT, and the ECM. Chances are the relays are bad. You need to test them as well. My 02 was doing the same thing and all it was was the relays. They are cheap. Start there first, then check the above.
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post #3 of 3 (permalink) Old 01-13-2010, 11:37 PM Thread Starter
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Thanks ill try that and see what i can come up with

88 F-350 Centurion 4x4, 7.3, C-6, BW1356 T-case, Ats Turbo, Straight pipe, Custom air intake, home made rear bumper, 35s, Kenwood head unit

96 Dodge 2500 4x4 5 spd, luk pro gold clutch, air dog 150 lift pump, 4k gov springs, afc mods, 0 plate, 140hp inj, bored .040 over, cooler tubz intake, bhaf, 64/12/65, 4in turbo back to two home made 6in stacks, 20* timing
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