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Old 12-04-2017, 07:31 PM   #1
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Need some lsj help

I have a 06 cobalt ss with the supercharged lsj I replaced cam and crank sensor and made sure the lines where aligned up with #4 in top dead center I changed spark plugs and I am getting a p0017 code saying crank and cam correlation the car just cranks and cranks before it starts but there are a few times it fires right up I pulled the cover and the chain seems tight and inline. Does anyone have a idea what could be my problem or what I can try next? Thanks, jeff
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Old 12-04-2017, 11:07 PM   #2
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How many miles? No timing chain noise?
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Old 12-05-2017, 11:30 AM   #3
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121k and I’m not sure what a timing chain would sound like. The car runs like a dream when started
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Old 12-06-2017, 06:42 PM   #4
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The only thing SI, which is gms dealer tech info, lists is check the crank balancer for proper torque, inspect cam sensor for proper alignment, and if not the engine has to be mechanically out of time.
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Old 12-06-2017, 06:45 PM   #5
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There is also a bulliten, PI# PIP4548F that talks about cam reluctors moving on the end of the camshaft. They are a press fit and do not have a keyway on them, and they can rotate slightly on the end of the cam, causing the sensor to think the engine is out of time, when it isnt. The reluctor on the end of the camshaft the sensor reads it off. And that is listed with symptoms p0017 and customer complaint of crank and no start.

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Old 12-06-2017, 07:00 PM   #6
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How do I get to these sorry I'm kinda new to the whole thread things
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Old 12-06-2017, 07:36 PM   #7
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you positive you got it lined up? #1 at TDC?
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Old 12-06-2017, 10:40 PM   #8
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When you line it up I thought #4 was at tdc
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Old 12-07-2017, 09:01 AM   #9
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Jeff, you are correct. Number 4 tdc on compression stroke.
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Old 12-07-2017, 12:00 PM   #10
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yeah sorry. had to look at my notes. it was #4 on TDC
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Old 12-07-2017, 02:19 PM   #11
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Yes I made sure it was aligned and at tdc when I installed it
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Old 12-07-2017, 04:02 PM   #12
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The sensor hex usually moves when you try to insert it. I generally remove the end cam cap so you can watch it go in the whole way.

A worn chain won't cause the code. You can be a whole link off either direction before the p0017 pops up.
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Old 12-07-2017, 06:18 PM   #13
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#1 and #4 will be at tdc at the same time.

liek armcclure said try the cam sensor again. they can be tough
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Old 12-07-2017, 06:19 PM   #14
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I did it once myself and had a Chevy dealer do it also they say it's timing chain but the car runs great
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Old 12-07-2017, 06:21 PM   #15
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take the valve cover off and check out the chain i guess
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Old 12-07-2017, 06:28 PM   #16
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#1 and #4 will be at tdc at the same time.

liek armcclure said try the cam sensor again. they can be tough
yes but one is compression stroke while the other is exhaust stroke. you have a 50/50 chance of being right or 180 off. the question is if it knows it's 180 off, and i would think so since it specifies #4 TDC compression rather than just saying #4/#1 TDC.
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Old 12-07-2017, 06:30 PM   #17
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yes but one is compression stroke while the other is exhaust stroke. you have a 50/50 chance of being right or 180 off.
you're right i was thinking about doing the cams at the same time.
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Old 12-07-2017, 07:00 PM   #18
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Take the cover off and what am I looking for on the chain
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Old 12-07-2017, 07:07 PM   #19
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on the chain, you'd be verifying that the timing is correct. look for the timing instructions online. turn the crank so that the marks on the cam sprockets are aligned with respect to crank TDC. I'd first check that the cmps is correct with respect to #4 compression stroke.
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Old 12-07-2017, 09:01 PM   #20
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When the EXH and INT marks are at 10&2 respectively, the engine is at tdc4 compression. Each will be 3.5 chain links up from the top of the head.
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Old 12-07-2017, 09:16 PM   #21
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My thing is that if the chain was off wouldn't the car run bad or at least idle bad
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Old 12-08-2017, 11:49 AM   #22
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I have intentionally ran the car a link off and you can't tell a difference.
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Old 12-08-2017, 12:52 PM   #23
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I have intentionally ran the car a link off and you can't tell a difference.
you must have a lot of time on your hands to be wanting to do that **** twice.
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Old 12-08-2017, 05:26 PM   #24
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you must have a lot of time on your hands to be wanting to do that **** twice.
haha no ****
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