Check engine light turned on after replacing the crank sensor

Tiny
SHAYRIMON
  • MEMBER
  • 1992 CHEVROLET CORSICA
  • 3.1L
  • V6
  • 2WD
  • AUTOMATIC
  • 230,000 MILES
I replaced the crank sensor and the car started fine, but the check engine is still on. I check for codes but no codes and only I have little bit white smoke from exhaust. What is the problem? I don't know what to do with this check engine light.
Thanks
Friday, June 3rd, 2022 AT 12:13 AM

17 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
It sounds like you have a blown head gasket which will explain the white smoke coming from the exhaust pipe. Here is a guide to help you confirm the head gasket failure, some checks you can do with no equipment or tools:

https://www.2carpros.com/articles/head-gasket-blown-test

Check this guide and video out. Please run down these guides and report back.
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Friday, June 3rd, 2022 AT 5:17 PM
Tiny
SHAYRIMON
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Hi, I will check it. I replaced the plugs with black carbon-fouled. I don't have white on the oil cap and no heat engine. I hope I will find if it is what you say.
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Saturday, June 4th, 2022 AT 7:42 AM
Tiny
KEN L
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Good job, the plug with the black carbon can be from a stuck fuel injector which can cause white smoke as well. Here is how to check the fuel injector:

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

Which cylinder had the black plug?
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Saturday, June 4th, 2022 AT 11:01 AM
Tiny
SHAYRIMON
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Thanks! Can stuck fuel injector can do check engine light? And how I find the injectors for this test? I have cover on the engine so I don't see them.
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Sunday, June 5th, 2022 AT 9:29 PM
Tiny
SHAYRIMON
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I think 3 or more was black.
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Sunday, June 5th, 2022 AT 9:30 PM
Tiny
KEN L
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Yes, that's a sign you have a stuck fuel injector. Did you check for a blown head gasket? Also does the engine use coolant. Here is how you can remove the injectors for testing, check the diagrams below:

REMOVE OR DISCONNECT:

NOTE: Use care in removing injectors to Prevent damage to the electrical connector pins on the injector, and the nozzle. The fuel injector is serviced as a complete assembly only. Since it is an electrical component, it should not be immersed in any type of cleaner.

1. Negative battery terminal.
2. Relieve fuel system pressure.
3. Intake manifold plenum.
4. Fuel rail assembly.

DISASSEMBLE:
1. Injector retainer clip and discard.
2. MPFI injector assembly.
3. Injector O-ring seals from both ends of injector and discard.

IMPORTANT: Each injector is calibrated for a specific flow rate. When replacing fuel injectors, order replacements with the identical part number as the old injectors.

ASSEMBLE:

1. Lubricate new injector O-ring seals with clean engine oil, and install on injector assembly.
2. New injector retainer clips on injector assembly. Position open end of clip facing injector electrical connector.
3. MPFI injector assembly into fuel rail injector socket with electrical connectors facing outward. Push in far enough to engage retainer clip with machined slots on rail socket.

INSTALL OR CONNECT:

1. Fuel rail assembly.
2. Intake manifold plenum.

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.
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Monday, June 6th, 2022 AT 12:57 PM
Tiny
SHAYRIMON
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Is it possible to check the injector with no remove all? I don't want to remove all for nothing.
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Tuesday, June 7th, 2022 AT 8:05 AM
Tiny
KEN L
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You can try it one at a time and then stop if you find a bad one.
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Tuesday, June 7th, 2022 AT 10:08 AM
Tiny
SHAYRIMON
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Hi, i try to find code and i find some code. What is the code?

https://www.youtube.com/watch?v=zWcmbChAV5s
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Wednesday, June 8th, 2022 AT 1:12 AM
Tiny
KEN L
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Thanks for the video it is showing code #43 which is Knock sensor or electronic spark control circuit fault. This can be the ignition module causing the issue.
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Wednesday, June 8th, 2022 AT 12:15 PM
Tiny
SHAYRIMON
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How do I know what is wrong? I listen to the engine and I I hear some ringing from the engine its can be the knock sensor, yes? Some friends say to me I need to replace the crank sensor for original GM and this check engine come out. Because I was at the garage and the mechanic replaced it with a new one but not original.
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Wednesday, June 8th, 2022 AT 10:17 PM
Tiny
KEN L
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I have seen the crank sensors be a problem and the ignition modules. Can you upload the engine making the noise so I can see what it is?
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Thursday, June 9th, 2022 AT 6:49 PM
Tiny
SHAYRIMON
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I try to take video and I send it. Thanks Ken!
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Saturday, June 11th, 2022 AT 12:41 AM
Tiny
KEN L
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That would be great. :)
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Saturday, June 11th, 2022 AT 10:10 AM
Tiny
SHAYRIMON
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Hi, this video.

https://youtube.com/shorts/3VEDIb2xXtM?feature=share
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Thursday, June 16th, 2022 AT 1:26 AM
Tiny
KEN L
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Thanks for the video, it seems like it is running okay, with that many miles the engine will be a little noisy. I would try changing the oil with a filter and add in some Lucas oil treatment. Also do you have an oil pressure light or gauge? You could have low oil pressure which means the oil pump pick up might be clogged.

This guide can help:

https://www.2carpros.com/articles/how-to-change-engine-oil-and-filter

Please run down this guide and report back.
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Thursday, June 16th, 2022 AT 4:29 PM
Tiny
SHAYRIMON
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Hi thanks! It's not the knock sensor you think?
I change the oil and filter for new one I have no problem with oil pressure its fine.
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Friday, June 17th, 2022 AT 7:41 AM

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