Cranking issue, multiple codes

CRUISE5020

MEMBER
1996 FORD F-150
5.0L
V8
2WD
AUTOMATIC
187,000 MILES

The truck is having a hard time starting up; it will crank run for a few seconds and shut off. I do this for 5 minutes or so and it will finally run. If it is cold, starts just fine. I pulled codes.

P0401 EGR system low flow vacuum line was off I put it back on.
P0300 random multiple misfires.
P0385 CKP sensor circuit b.
P0171 system too lean bank 1.
P0174 system too lean bank 2.

Running code p1000 on board diagnostic system test incomplete.

Was told to replace CKP crank sensor because when that code is cleared no issue with start hot or cold, but where is it? Bought this from Napa css437 crank sensor have no idea location and what I have to remove to get to it. If this was a Ford Ranger I would be done.

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2 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

Good evening,

The crank sensor is a misfire sensor. It detects misfires for reference to the ECM.

I attached a picture and posted the procedure for you.

The 300 is a misfire code. The most common cause for this along with the 171,174 codes is low fuel pressure. You need to check the actual fuel pressure when it shuts down.

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

https://www.2carpros.com/articles/repair-lean-mixture-codes-p0171-or-p0174-on-some-manufacturers

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Roy

REMOVAL AND INSTALLATION
1. Disconnect battery negative cable.

NOTE: When the battery has been disconnected and reconnected, some abnormal drive symptoms may occur while the Power-train Control Module (PCM) relearns its adaptive strategy. The vehicle may need to be driven 16 km (10 miles) or more to relearn the strategy.

2. Remove attaching screws and timing pointer.
3. Disconnect wiring and remove sensor.
4. To install, reverse removal procedure. Tighten attaching screws to 8-12 Nm (75-105 lb in).

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