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Old 10-05-2021, 08:33 PM
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Suspicious sporadic start

Hello guys. I'm new here and this is my first post. I just bought a 2003 4.6is. And it needed a little work, according to the seller. He stated that all it needs is a throttle body and maf sensor. I scanned the vehicle with my INSTA software, and sure nuff, it came back with the codes for the throttle and maf sensor and also the pedal potentiometer. I changed the tb and sensor but couldn't get it to start. Mind you, last week, it was the samething. I tried starting it bit it wouldn't start. Went out a few days later, it started right up. Along with the bad idle he told me about. I let it idle for a while to see if it would clear up but it didn't. Turned it off and I couldn't start it again. Fast forward to now, this is where I'm at. Cranks but no start with the TB and sensor newly installed. I checked for fuel in the rails, has fuel. Checked for spark. No spark
I don't know why it would start one time and not the next. Is it possible that it being immobilized? I don't know at this point. Can I get some of yous to help? I would really appreciate it. Thanks. And I have videos of it idling and pictures of the codes I pulled if that would help ya.
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Old 10-05-2021, 10:47 PM
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Crank fuel no spark hints at EWS so scan for EWS.

No start intermittent suggests crank position sensor. (and may also inhibit spark).
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Old 10-06-2021, 08:03 AM
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Can you clarify what EWS is? And with CPS? It never showed up on the scan. Could it still be a possible culprit? And which CPS should I change or check? There's two of them.
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Old 10-06-2021, 10:53 AM
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CPS is cam position sensor and I'm not sure that will prevent a start, the car I think has a workaround for the CPS not working.

Crank sensor is CPK for some reason. I'm pretty sure the car won't allow spark until it knows where the crank is.

EWS stands for D rive A way P rotection.

(Whatever the three words in German). Aka immobilizer.

The "catch22" is that you won't get a code until you get a start from my understanding. But look into immobilizer, because it comes up on the forum regularly the EWS gets out of sync and allows crank but no start (why allows crank the world may never know)
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Old 10-06-2021, 11:28 AM
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Okay. Will do.
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Old 10-06-2021, 11:54 AM
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Can we check fuel pressure? How many miles on it? How much fuel is in the tank?
No spark is a biggie. Remove and clean the cam position sensors. Check the wiring harness. Wiggle the harness while someone cranks it.
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Old 10-06-2021, 12:02 PM
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Which is the cam sensor and which is the crank sensor?
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Old 10-06-2021, 01:25 PM
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Quote:
Originally Posted by X5chemist View Post
Can we check fuel pressure? How many miles on it? How much fuel is in the tank?
No spark is a biggie. Remove and clean the cam position sensors. Check the wiring harness. Wiggle the harness while someone cranks it.
Yes there's fuel in the tank. I have 15X,XXX miles on it. I just replaced the tb and maf sensor.
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Old 10-06-2021, 01:27 PM
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Cam sensors are right on the front of the engine. The crank sensor is usually near the bell housing for the transmission. I've never changed on M62 not sure exactly where it is.
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Old 10-06-2021, 01:33 PM
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Quote:
Originally Posted by andrewwynn View Post
Cam sensors are right on the front of the engine. The crank sensor is usually near the bell housing for the transmission. I've never changed on M62 not sure exactly where it is.
Okay.
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