Will crank but will not start?

KALANIR

MEMBER
2001 FORD F-150
4.2L
6 CYL
2WD
AUTOMATIC
160,000 MILES

I was driving the other day and it started to bog down, so I let off the gas, pressed it again RPMs went up a little then the RPMs went crazy and stalled out. Now it won’t start but it cranks.
I’ve checked the relays/fuses.
Fuel pump is turning on/ fuel pressure good.
Battery.
Spark plugs/cord/ distribution box.

Sunday, April 2nd, 2023 AT 3:18 PM

6 Replies

JACOBANDNICKOLAS

MECHANIC
110,176 POSTS

Hi,

In most cases, a crank no start condition is the result of either a fuel loss or ignition spark loss issue.

Do me a favor. See if it will start with starting fluid. If it does and then stalls, we know it is fuel related. If there is no change, we need to check for an ignition spark at the plugs.

Here is a link that explains how that is done:

https://www.2carpros.com/articles/how-to-check-for-ignition-spark

Let me know what you find.

Joe

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Sunday, April 2nd, 2023 AT 9:52 PM

KALANIR

MEMBER
4 POSTS

I replaced the crank shaft sensor, nothing.
But I sprayed some starter fluid in n there, cranked right up.

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Monday, April 3rd, 2023 AT 9:06 AM

KALANIR

MEMBER
4 POSTS

It stays on too and turn the key off and on drove it down the block 2 times.

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Monday, April 3rd, 2023 AT 9:07 AM

JACOBANDNICKOLAS

MECHANIC
110,176 POSTS

Hi,

Did you use the starting fluid after the new CKP sensor was installed or did you try it prior? I ask because if you did, then I don't know if the CKP was bad prior.

However, if it started with starting fluid, that tells me there is a fuel-related issue. At this time, is it operating normally?

Let me know.

Take care,

Joe

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Monday, April 3rd, 2023 AT 8:30 PM

KALANIR