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1990 Dodge Dakota Question: Please help with no start issue 1989 dakota 3.9l throttle body injection.

 

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lightsaber, Raton, NM, January 12, 2014, 15:58
 Journeyman

The truck sat for 10 years outside, gas tank was close to empty. Installed a battery, replaced clogged air filter with new air filter, added two gallons fresh gas to tank, removed the return line from throttle body and gas shoots out for two seconds with key in run position. With the return hose reconnected, and engine cranking over, no gas spraying from the two injectors in the TB. The engine spins ok with the starter, no odd noises. Battery voltage 12.47V from bat ground to plus pins on injector connector from pcm. One neg pin pegs analog meter, and the other neg pin has no continuity with key in run position. Key on chk eng light obd1 codes are 1 space 2 space 5 space 5. The injector resistance is 0.00 for both on ohm X 1k setting. Distributor has rust on rotor rivet, and inner cap terminals, but spark is jumping from coil wire when I hold the terminal close to engine ground. Any thoughts on what to check next, or what is causing the injectors to not spray. Thank You!

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  • Answer #1

    pushrod January 12, 2014, 16:04
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     Master

    Now check for good hot spark at the plug wire to see if it looks the same as from the coil and jumps the same gap. Post results. Also any sign 'mice' have been around or on top of the engine?

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    lightsaber, January 12, 2014, 16:31
     Journeyman

    Thanks for the fast response pushrod! No evidence of mice/rodent damage in the engine compartment. The spark from the coil was yellow. I will have to check the spark at the plug wire tomorrow as the truck is across town, and it is already dark out. I will post results then.
    I forgot to mention earlier that if i pour some gas into the throttle body and then try to start it, the engine will start up and run for a few seconds until that gas is used up.

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    pushrod, January 12, 2014, 19:23
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     Master

    That was my next suggestion! Takes care of spark! No more testing needed there. Need to check injector pulse,,engine cranking,, to rule out plugged injector flow circuit. Fuel pressure would be good to know also.

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    lightsaber, January 13, 2014, 00:20
     Journeyman

    Fuel pressure is good at 13 psi, noid light flashes for both injector circuits, but turned out the injectors were plugged or stuck. Thanks to Barryman's fuel injector cleaner and manually pulsing injectors the truck is working fine now! Thanks Pushrod!

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