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Old 05-14-2018, 04:03 PM   #1  
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Default Timing jumps

I have a 96 na miata. I just turboed it and have a mspnp2. I first tried to start car and timing was off. I adjusted time and idle and it wouldn't start. I checked the timing and it was off again. Did this multiple times. Belt has all teeth in good condition. Crank timing pulley is good and key is good. Cant find out the problem.
only have downpipe on turbo,
intercooler,
GM iat.
thanks in advance
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Old 05-14-2018, 05:20 PM   #2  
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How are you adjusting timing?
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Old 05-14-2018, 05:59 PM   #3  
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How are you adjusting timing?
taking out 1st plug, going to tdc, setting cam gears to appropriate markings, and making sure everything is right and right
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Old 05-14-2018, 08:53 PM   #4  
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The belt is jumping everytime you try and start it? Does it skip teeth if you crank over the motor by hand with a breaker bar? Also the motor has to make 4 IIRC* revs before the timing marks line up again (someone will have to confirm this for me)
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Old 05-14-2018, 09:31 PM   #5  
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Turning it with a breaker bar doesnt seem to make it jump teeth. And i thought it was 2 rotations to be right again
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Old 05-15-2018, 02:47 PM   #6  
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Originally Posted by Surferdudek1ng1 View Post
Turning it with a breaker bar doesnt seem to make it jump teeth. And i thought it was 2 rotations to be right again
It is two rotations.

Is the adjustable timing belt idler (tensioner) adjusted properly? It is possible to be torqued down too loose if all of the slack wasn't taken up between the other gears before tightening. The little spring doesn't work as well after 20 years of tension.
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Old 05-15-2018, 02:50 PM   #7  
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Quote:
Originally Posted by Surferdudek1ng1 View Post
taking out 1st plug, going to tdc, setting cam gears to appropriate markings, and making sure everything is right and right
so it's working exactly as it should.


tl;dr i.e. you never locked the timing to a static number ...
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Old 05-15-2018, 06:06 PM   #8  
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I replaced the spring with a new one, made sure the tensioner was tight enough to not move but didnt check specs to tighten it. And what do you mean lock it to a static number. Am I missing a step with the process to lock it. I thought this put it at 10 and set it there
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Old 05-15-2018, 06:09 PM   #9  
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you are most definitely missing the step of locking it at 10*

is it jumping by about 4-6*?
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Old 05-15-2018, 06:24 PM   #10  
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Its jumping enough to where the car will die and wont start back up. How do I go about locking the timing
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Old 05-15-2018, 06:26 PM   #11  
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its not the timing jumping that's causing the car to stall, it's the complete lack of fuel tuning...
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Old 05-15-2018, 06:31 PM   #12  
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When I physically check the timing after it dies it seems to be different from where it was set
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Old 05-15-2018, 06:33 PM   #13  
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are you doing this?

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Old 05-15-2018, 07:05 PM   #14  
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I'm not sure if I set it to fixed or not. I'll check when I get back to the car tonight
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Old 05-15-2018, 07:16 PM   #15  
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Old 05-15-2018, 09:32 PM   #16  
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Changed the setting in Ms and Ill get car out back together tomorrow and follow up with it
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Old 05-16-2018, 08:47 AM   #17  
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Quote:
Originally Posted by Surferdudek1ng1 View Post
Changed the setting in Ms and Ill get car out back together tomorrow and follow up with it
you forgot the step where you set the trigger angle using a timing light, and then unlock the timing to go back to a table...
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