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23:01:45 - 12/19/2024
V6 Dakotas
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nomekid
Dodge Dakota
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11/09/2004
20:49:02
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 Subject: wont start, 5 sensors no power, new comp
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I have a 1993 Dakota, 3.7L, V6. Will crank when go to start, but will not fire. Checked everything. 5 sensor do not have power, they are: Crank position sensor, throttle position, map sensor, charge air temperature, and idle air control.
Replaced computer, no codes. Battery is good, ignition is good, fusebox, fuses, and wires good...any ideals?
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93dak4x4
Dodge Dakota
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11/10/2004
08:38:47
|  RE: wont start, 5 sensors no power, new comp
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This is from a previous post, i think this will apply:"Right below the underhood fusebox, about 8" down the harness is a splice (#115), from that splice, it powers the PCM, Fuel Pump, and Coil. All four wires are Red/white, one comes from the fusebox, two go right back up to the relays, and the fourth goes the opposite direction to the PCM. You will have to unbolt the fusebox, pull it out of the way, and cut open the tape on the harness to find the splice.
I guess what happens is that water gets into the fusebox, drains down the harness, and eventually corrodes the splice into green powder (oxidized copper). You cannot tell if it is bad by looking at it, you will have to cut the tape off of the splice and inspect the connection. If you see and green or white residue on the connection under the tape, it has started to go bad and needs to be re-done (preferably by soldering).
This problem can be very intermittent, sometimes just a single miss while cruising down the highway, sometimes just a long cranking time, mine was even sensitive to temperature (28-40F) and high humidity. The problem in my 94 Dak occurred intermittently 30+ times and over $1000 in parts over a year. Finally one day it just died in Toledo, luckily I was walking distance from Vin Devers Dodge. When I got there, they were closing in 5 minutes, one of the mechanics there said he new exactly what the problem was, grabbed some tools and drove me back to my truck to fix it, AFTER CLOSING TIME! This guy earned every penny CryCo pays him. Never had the problem since, 80,000 miles later.
My 95 Dak just refused to start one day after I replaced my 14x3 K&N with a 14x4 filter. When I was done it would not start! It was just a coincidence, as it turns out, but I sure was confused at the time. I checked the splice as a hunch after I could not get a voltage reading at the PCM. Sure enough, after I cut the harness to get a better look at I thought that the splice looked fine, but I gave it a little tug to get a closer look, and it snapped in half! Up until that time, I never had it die, it never stumbled, nothing. I even drove the truck the night before and never even a stumble.
A guy I work with also has a 93 Dak that had the exact same problems.
The point I'm tying to make is that this is a big problem on 92-95 Daks and you need to check it if you own one. Chances are if you ever drove in the rain, yours has already started corroding."
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nomekid
Dodge Dakota
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11/10/2004
10:58:10
| RE: wont start, 5 sensors no power, new comp
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Thanks 93dak4x4, I'll try pulling on it as you suggested, because it looks fine.
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