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I have a 99 suburban 5.7 rebuilt engine that I. Have just…

Customer Question
I have a 99...

I have a 99 suburban 5.7 rebuilt engine that I. Have just installed but I get no fire when cranking and gives two codes crankshaft position sensor and evap system pressure high

Mechanic's Assistant: Thanks. Can you give me any more details about your issue?

I was wondering if the reluctor ring may be backwards and how can I figure this out without breaking the engine down

Submitted: 2 years ago.Category: Chevy
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Answered in 26 minutes by:
3/2/2016
Chevy Mechanic: Juan Crespo, ASE Certified Technician replied 2 years ago
Juan Crespo
Juan Crespo, ASE Certified Technician
Category: Chevy
Satisfied Customers: 1,532
Experience: A.S.E. Master Technician, Advanced Level, Emissions - Asian, Domestic, & European
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Do you have a scope so we can see what the crank signal looks like?

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Customer reply replied 2 years ago
No I do not
Chevy Mechanic: Juan Crespo, ASE Certified Technician replied 2 years ago

Then, I'm sorry, but I can't help you. I'll opt out so others may try. Do not reply until another expert responds or the site will revert this request back to me.

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Chevy Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago
sprinkles08
sprinkles08, ASE Certified Technician
Category: Chevy
Satisfied Customers: 24,206
Experience: ASE Master and Advanced level certified. Factory trained with 17 years dealership experience
Verified

Hello and welcome to JustAnswer!

It's possible that you have a failed sensor, a wiring issue, or it's definitely possible there is an issue with the tone wheel the sensor reads from. It may be damaged, installed incorrectly or the engine may have been assembled without one.

Was the timing cover on the engine when you received it?

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Customer reply replied 2 years ago
When I received the engine it did not have a timing chain cover. It was my first time dealing with the reluctor ring so I may have put it on backwards. I'm hoping there is a way to check without breaking it down. I replaced the crankshaft position sensor but have not checked the wires. I put the distributor on and got it where I believe it should be since it has cam sensor.
Customer reply replied 2 years ago
Another thing they say the harmonic balancer should have two timing marks but all I see is the one so I lined it up with the pointer on the timing cover.
Chevy Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago

The key was in the crank, correct?

Was there any damage to the crank sensor that was removed?

Where did the replacement sensor come from?

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Customer reply replied 2 years ago
The reluctor ring slid on with the key in the slot, the old crank sensor was scratched up a little, and I bought it off ebay.
Chevy Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago

Can you use something such as a mirror to see if the tone wheel is centered under the crank sensor hole?

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Customer reply replied 2 years ago
I can see it the ring through the hole and it looks centered. Can you put these in backwards? I have a camera ordered so I can look inside if that can help out any.
Chevy Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago

It can install either direction but if it's centered then it should be ok.

What is the actual P code setting?

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Customer reply replied 2 years ago
P0336 crankshaft position sensor a ckt range/perf and p0453 evap emission control system press sensor high
Chevy Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago

A circuit code is an electrical issue. Has any testing been done?

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Customer reply replied 2 years ago
No that's not my strong suit but I do have a voltage tester
Chevy Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago

The first thing that needs to be done is test the pullup voltage on the signal wire, the reference voltage and test the sensor ground.

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Customer reply replied 2 years ago
Test these while the key is turned or just with the key on
Chevy Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago

You would test with the key on.

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Customer reply replied 2 years ago
All right Ive got the crank sensor figured out. It wasn't seated all the way. It was a tight fit and needed to be pushed in further but I'm still getting a no start with the evap high pressure code.
Chevy Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago

Does it have spark now?

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Customer reply replied 2 years ago
I hooked up to number one spark plug and it did produce a spark.
Chevy Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago

It would be best to check all cylinders.

What is fuel pressure?

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Customer reply replied 2 years ago
All right I had a chance to mess with the suburban again. The pressure on the fuel line is 60 psi when cranking. I get spark to cylinder number 1 but I have not checked other cylinders yet. When I was tightning the small bolts that hold the fuel line down to the intake I striped one but no fuel leaks so it looks like it's holding good.
Chevy Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago

Have you removed spark plugs to see if they're fouled?

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Customer reply replied 2 years ago
I've just put new ones on. How can you tell
Chevy Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago

If they're fouled then they would be covered with a liquid or solid, in this case most likely fuel.

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Customer reply replied 2 years ago
I checked the spark plugs but they appear clean. They smell like gas but I didn't see any residue.
Chevy Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago

Have you checked for spark on the other cylinders yet?

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Customer reply replied 2 years ago
No, when I have the time I guess I'll check spark and clean them to see what that does
Chevy Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago

Ok.

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Customer reply replied 2 years ago
I had time to mess with the suburban today. I took off the intake and there is some oil on the front portion. It doesn't appear to have fuel leaking into it. I pulled a couple spark plugs. They smelled of gas but didn't appear to be covered. The fuel regulator was pretty nasty so I'm thinking of replacing it.
Chevy Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago

Have you checked for spark on the other cylinders yet?

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Customer reply replied 2 years ago
I think the plugs might be fouled. It smells like fuel and I can see some in the threads. I replaced the plugs but should I try and crank it or will this foul out the new ones?
Chevy Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago

Have you checked for spark on the other cylinders yet?

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Customer reply replied 2 years ago
I checked 3 cylinders but I'll check them all tommorrow. Hopefully it doesn't foul them again.
Chevy Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago

Let's go ahead and check all cylinders and make sure spark is strong on all.

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Customer reply replied 2 years ago
I've got it figured out. Once I lined up the 6 and 8 on the distributor drop it in and let it turn. Then I rotate the distributor until the ***** *****nes up with the cam position sensor. Every tutorial that I looked at left out the last part. I appreciate your help and time. I was about to go nuts trying to figure this out.
Chevy Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago

I'm glad you got it fixed!

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