1999 Chrysler 300 Son's 300M

  • 1999 CHRYSLER 300
  • 150,000 MILES
My son's 99 Chrysler 300M wont start. A day ago, a went out to start the car, claimed that he felt vibrating coming from the hood and the engine started racing. A couple hours later, I went to try and start it, it tried to turn over, but couldnt. I tried to listen if the fuel pump was running, and couldnt hear it. Replaced the fuel pump relay, still wont turn over. So is it the fuel pump, or something worse like the timming chain busted?
Do you
have the same problem?
Thursday, June 20th, 2013 AT 2:21 PM

1 Reply

Nobody is going to make a wild guess like that. We just don't work that way.

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.
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Thursday, June 20th, 2013 AT 3:11 PM

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