Whining sound slow crank no start - Engine Troubleshooting


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Whining sound slow crank no start

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Auto Repair Home>> Automotive Repair>> Engine Troubleshooting

Soak1dna
New User

Apr 6, 2017, 4:43 PM

Post #1 of 3 (1443 views)

Whining sound slow crank no start	Sign In

I have a 2002 Ford Explorer and it died on me while driving down the road. When I try to start it it would not start again. I replaced all the spark plugs and wires as well as the crankshaft position sensor it's a brand-new battery with plenty of voltage. Every time we try to turn it over it's real sluggish and seems to have a hard time it does turn but will not start

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Apr 6, 2017, 7:27 PM

Post #2 of 3 (1426 views)

Re: Whining sound slow crank no start	Sign In

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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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

Soak1dna
New User

Apr 6, 2017, 8:46 PM

Post #3 of 3 (1416 views)

Re: Whining sound slow crank no start	Sign In

we pulled a sparkplug and did the "screwdriver" test and there was one very faint and weak spark. I had the coil pack tested and it tested fine. I will follow up with the fuel side of it tomorrow. thank you

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