Starting problems

Tiny
SASSOANTHONY123
  • MEMBER
  • 2000 FORD CROWN VICTORIA
  • V8
  • 2WD
  • AUTOMATIC
  • 142,000 MILES
My car cranks but wont start, I think it has something to do with the fuel/ and or air system {either where the air intake goes into/ the fuel injectors/ or some part of the fuel system} what could be the problem?
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Wednesday, January 12th, 2011 AT 10:38 PM

7 Replies

Tiny
WRENCHTECH
  • EXPERT
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.
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Wednesday, January 12th, 2011 AT 11:06 PM
Tiny
SASSOANTHONY123
  • MEMBER
Ok thank you, I checked power on the + terminal and its good. But tomorrow im going to get the noid light, and a fuel pressure gauge to check everything, oh and where do I hold the noid light to, too check the injector?
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Thursday, January 13th, 2011 AT 1:22 AM
Tiny
WRENCHTECH
  • EXPERT
Unplug one of the injectors and the noid light plugs right into the harness.
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Thursday, January 13th, 2011 AT 1:24 AM
Tiny
SASSOANTHONY123
  • MEMBER
Ok I was about to change my whole air intake system, befor this all started happening but it still started when I oput everything back on. And now every once in awhile it starts if I poke at the fuel injectors or mess with the air intake (and on the fuel injectors sense my car is so old they are just out on the sides of the engine and they got fully soaked the day all this started happening could also any of that be the problem?
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Friday, January 14th, 2011 AT 5:53 PM
Tiny
SASSOANTHONY123
  • MEMBER
Hey I replaced the fuel pump off switch right after this all started happening, and one of my friends said they go bad all the time; he also said that when he replaced the switch he also replaced the fuel filter bcuz it was shut off for too long from the button being replaced. Nd his car was doin the same thing mine is! So I guess the question is do yu think that I could have the same problem as my friend did/ & Or any sugestions about that?
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Saturday, January 15th, 2011 AT 2:06 AM
Tiny
WRENCHTECH
  • EXPERT
I don't think anything. You need to do the testing, not just guess.
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Saturday, January 15th, 2011 AT 3:40 AM
Tiny
SASSOANTHONY123
  • MEMBER
Oh ok.
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Saturday, January 15th, 2011 AT 4:28 PM

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