Driving it starts to buck and stalls and the temperature bar lights up briefly

Tiny
NASSAU1969
  • MEMBER
  • 2000 FORD CROWN VICTORIA
  • 4.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 130,000 MILES
Slight misfire. That was fixed last month code was a cylinder 8 coil pack replaced. Has another. It’s another miss fire that just started. No dummy lights no codes either. Now the car idles fine with miss fire. No code shows and It restarts after a few try’s. Rev it up in neutral it stalls. You can drive it at low speed and bucks a little.
Ruled out fuel filter, fuel pump and bad gas. My mechanic who is a P71 expect is also a Police dept Mechanic. He says the temperature bar that briefly lights suggesting the temperature censer is bad and shutting down the cylinders and engine. He also saying the transmission is failing and over heating. What I don’t get is when I floor the car it takes off fine the transmission seems fine then it shuts down.
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Sunday, November 10th, 2019 AT 8:19 AM

8 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi:

It can be multiple things causing this. As far as the temperature light, it could be a sensor. However, why is he saying the transmission is overheating? Has there been any indications of that issue?

As far as the engine turning itself off for a temperature issue, that wouldn't be a very safe design. Are you sure there are no engine vacuum leaks and that the fuel pressure is within spec? I know you ruled out fuel issues, but what pressure was found?

Let me know.
Joe
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Sunday, November 10th, 2019 AT 10:17 PM
Tiny
NASSAU1969
  • MEMBER
Hey Joe thanks for the response. All the symptoms were spot on match for the CHT, the cylinder head sensor underneath the front driver side intake manifold. It was in bad it shape and was in need of being replaced. Shockingly it was part of the problem but it didn t solve it. I finally said it has a miss fire and figured out by replacing the two coil packs on each side of it fix the problem. One of the coil packs was bad and was arcing making the sensor send full signals to the computer that it was overheating to shut down the car. This is a new one for the books because the police mechanic was a little shocked, 99.9% it would have been the CHT sensor. Thank you.
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Tuesday, November 12th, 2019 AT 7:05 AM
Tiny
NASSAU1969
  • MEMBER
The coil packs was sending false signals I said full signals to the computer which was shutting it down falsely saying the car was overheating. That s why the computer went into shutdown mode on the engine. The car was idle with no problem for like hours. But once you gave the car more RPM's the ark increased that s when the problem would happen.
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Tuesday, November 12th, 2019 AT 7:08 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Glad to hear you got it going. Honestly, I suspected the sensor was bad, but not the coil packs. Did new codes show up once the sensor was replaced?
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Tuesday, November 12th, 2019 AT 6:18 PM
Tiny
NASSAU1969
  • MEMBER
What s crazy it showed no codes. The lights would light up briefly and go out with the computer hooked up driving around. It didn t even pick up the miss fire and it usually does.
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Wednesday, November 13th, 2019 AT 3:30 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Interesting. I have to be honest. The only thing I can say about technology is there more there is, the more headaches people are going to have. It is great in some ways and a nightmare in others.

Regardless, as long as it's running properly, that's all that matters. Take care and let us know if you have questions in the future.

Joe
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Wednesday, November 13th, 2019 AT 5:41 PM
Tiny
NASSAU1969
  • MEMBER
Thank you.
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Thursday, November 14th, 2019 AT 10:04 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
You are very welcome. Take care. Tomorrow is Friday, so have a good weekend.

Joe
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Thursday, November 14th, 2019 AT 8:41 PM

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