1990 Dodge Dakota

Tiny
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  • 1990 DODGE DAKOTA
Engine Mechanical problem
1990 Dodge Dakota 6 cyl Four Wheel Drive Manual

i have a 1990 dakota 4x4 3.9L. I can pres the clutch in and it revs up a little over 20000 rpms and when I let off the clutch my truck starts going as if I was pressing in my accelerator. I can shift into gears fine but it revs really high when i'm stopped with the clutch engaged.
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Tuesday, June 1st, 2010 AT 10:05 PM

13 Replies

Tiny
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Has the check engine light come on?
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Friday, June 4th, 2010 AT 10:54 AM
Tiny
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Yes the light came on
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Friday, June 4th, 2010 AT 10:10 PM
Tiny
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If the check engine light is on, there is a code stored in the computer. Follow these directions and let me know what you find.

NOTE: DO NOT START THE ENGINE.

With the key in the off position, cycle it 3 times to run, off, run, off, run, off, then run and wait. At this point, the check engine light will go off and then begin to flash. Each trouble code is a 2 digit number. Count the flashes. There will be a slight pause then it will flash again. Count the flashes again. The second set of flashes is the 2nd digit of the code. There will be a longer pause and it will start on the next code if there is one. The last code you will get is a 55. That lets you know it is done. Let me know what codes you get and I'll look them up for you to help identify the problem.

Let me know what you find.
Joe
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Saturday, June 5th, 2010 AT 5:52 PM
Tiny
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Ok I did what ya said and counted the flashes and heres what I got

12 27 35 55
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Monday, June 7th, 2010 AT 12:46 PM
Tiny
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I will get back to you tonight when I am home from work. I have the older trouble code list at home.

Take care,

Joe
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Monday, June 7th, 2010 AT 1:15 PM
Tiny
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Okay, here is the list:

12 - indicated that the battery or power has been cut to the logic module in the last 15 start-ups.

27- Injector driver control circuit open or shorted

Possible Causes
Bad connection or wiring - Check the wiring and connections between the fuel injector and the power module (or SMEC) and the injector contol lines between the logic module and power module. Clean and regrease any corroded connectors with dielectric grease and repair any shorts.
Injector driver transistor failure - Check the injector signal coming from the power module (or SMEC). It should rise to about 12V when the injector is off and drop close to 0V when the injector is on. If it is out of spec, you may need to replace the power module.

35 - Radiator fan relay circuit is open or shorted
I don't believe you have a fan motor, but rather you have a fan clutch. I'm not sure why this is coming up.

55 - Sequence complete

If I had to guess, I would suggest starting by checking the wiring to the injectors. If there is a problem there, it could cause the idle to be a little crazy as you mentioned. You could also erase the codes and see it that changes performance and if the same codes come back. To see if you have fixed the problem that generated the code, your can erase all codes by removing power to the ECU (by disconnecting the battery or otherwise) for about 10 minutes. This will clear the ECU's memory and generate code 11 and code 12. Crank or start the engine to see if the code in question returns. The code 11 should disappear as soon as the engine is cranked and the code 12 will disappear after 15 on/off cycles.

Let me know what you find, and sorry it took so long to get back to you. WHAT A NIGHT!

Joe
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Monday, June 7th, 2010 AT 10:14 PM
Tiny
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Ok but what about it just moving on its own when I let the clutch off with out me pressing the gass?
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Tuesday, June 8th, 2010 AT 1:36 PM
Tiny
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It could be causing a rich or lean mixture that has an affect on the idle.
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Tuesday, June 8th, 2010 AT 2:13 PM
Tiny
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One more question. Does it matter that its carberated rather than fuel injected?
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Friday, June 11th, 2010 AT 12:57 AM
Tiny
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In 1990, they had throttle body injection. Is yours different?
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Friday, June 11th, 2010 AT 11:26 PM
Tiny
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I have a holley carburator 2 barrel it's not fuel injected
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Saturday, June 12th, 2010 AT 1:39 AM
Tiny
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If you have a carb on it, someone has changed it. Now that I know that, I'm not sure what all was changed. Does it ever idle down to where it should be? Have you tried adjusting the curb idle speed?
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Monday, June 14th, 2010 AT 11:08 AM
Tiny
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It starts out normal then when it warms up it starts to idle high. But right when I start it up I can put it in 1st and let off on the clutch with out pushing the gas and it moves as if i'm easing on the gas
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Monday, June 14th, 2010 AT 11:51 PM

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