Mechanics

95 NO START

1995 Dodge Dakota • V8 4WD Automatic • 190,000 miles

95 dodge dakota, was shutting off in idle. Did tune up got codes 23, 25, and 37. Replaced every sensor including map, idle control, air temp, crank sensor, pick up coil, egr, EVERY including new oil pump, still wont start, acts like auto shut down is kicked in. Hear fuel pump engage but no fuel or oil pressure. Has spark and compression.
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Chrissyw66
August 1, 2011.




Now that you've thrown every part that you can think of at it, it's time for the diagnostics that you should have started with.

All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be tested during the failure. Any other time and they will simply test good because the problem isn't present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.

Every engine requires spark, fuel and compression to run. That's what we have to look for.

These are the basics that need to be tested and will give us the info required to isolate a cause.

1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.

2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.

3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.

4) If all of these things check good, then you would need to do a complete compression test.

Once you have determined which of these functions has dropped out,
you will know which system is having the problem.

Wrenchtech
Aug 1, 2011.
Started there, have compression, have spark, passed the noid test, and fuel pumps engages but then shuts down, no fuel pressure. Was told the auto shotdown. It showing codes 23, 25, and 37.
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Tiny
Chrissyw66
Aug 1, 2011.
The only one that could have any effect there is the code 23 which is for intake air temp sensor which I suspect you set yourself by trying to start it with it unplugged.

If you have no fuel pressure, concentrate on why. Check it while cranking.

Wrenchtech
Aug 1, 2011.

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