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car rattles after cam install then wont start at all!

This is a discussion on car rattles after cam install then wont start at all! within the Tech Lounge forums, part of the W Body Tech category; alright guys i finally installed my INTENSE stg 1 cam along with jp timing chain and oer lifters everything was ...


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Old 07-05-2008, 03:42 PM   #1
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Default car rattles after cam install then wont start at all!

alright guys i finally installed my INTENSE stg 1 cam along with jp timing chain and oer lifters everything was cleaned and lifters were put in oil a day before the install. after we got everything back together the car ran fine ran strong on the top end but when i was running the car i started to get valve float so i stopped runing it hard. when i left my friends house i notice the car ran really sluggish like a (4cylinder) so i dropped into second and it would barely pick up speed and was making this rattling noise that went up with the rpms.
first thing that was checked was oil pressure it was45 to 50 psi at idle and climbed with the rpms.
i though it was valve train related and the lifters werent pumping up all the way.
we checked the dampener pulley and that seems to be where the noise is coming from....but it also sounds like its from the top some.
now the car wont start and sounded like somthin is locked up in there.
also it did through some codes and timing was jumping all over the place!
i think its the dampener that is all screwed up and caused the timing to be out .
any ideas are welcomed, thanks in advance
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Old 07-05-2008, 06:18 PM   #2
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Default Re: car rattles after cam install then wont start at all!

still turns over though?
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Old 07-05-2008, 06:38 PM   #3
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Default Re: car rattles after cam install then wont start at all!

The dampner wouldnt cause the timing to be out. Did you align the timing dots correctly? they should look like this. This is from when i installed my xp cam about a month ago.







Did you put the cam thrust pate back on correctly? or back on at all?


Here is the link to the direct thread of mine-http://www.grandprixforums.net/f14/the-swap-pic-heavy-4210.html
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Old 07-05-2008, 07:28 PM   #4
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Default Re: car rattles after cam install then wont start at all!

well the car stoped turning over so i got a wrench and turned it over by hand at first it was really hard then it broke loose and turnover really easy and smooth. yes i had all the dots line up on the timing chain and balance shaft, also the thrust plate was put back on. it does crank over put its very hard to keep it running, and the im pretty sure the noice is coming from the balancer

by the way nice write up the pics would have been helpfull when i did mine
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Last edited by chrisb; 07-05-2008 at 07:43 PM.
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Old 07-05-2008, 07:32 PM   #5
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Default Re: car rattles after cam install then wont start at all!

Well the ballancer wouldnt throw the engine out of time. Now if you had a bad ballancer you may get a bad vibration from the engine but thats it. how long was the engine running for? I'd do an oil change and inspect it for any kind of metal debris before i would touch the motor anymore.
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Old 07-05-2008, 07:35 PM   #6
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Default Re: car rattles after cam install then wont start at all!

Im not saying to do this but can you turn the engine over by just using the starter? Again if the engine was runnning for a little while i'd do a oil analisis first before. That may not be a sure way of finding out if something internally is messed up but it's a good start. What kind of noise is comming from the ballancer?
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Old 07-05-2008, 08:06 PM   #7
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Default Re: car rattles after cam install then wont start at all!

well i was driving it yesterday with no promblems i had about 40 miles on it before it took a crap on me, now im not saying your wrong on the balancer part but doesnt the computer use the inner part of the balancer to know when to fire the spark plugs? my uncle and cousin+ dad who are mechanics all say the the second piece inside the balancer can brake loose from the outside and spin freely kinda like a spun rod bearing causing the timing to be off. when i scan with hp tuners timing would fall off and the car would die, then when i tried starting it back up it would crank over but it was like half of the cylinders were not firing to turn the crank completely over. oh and the sound is like a rattling sound scraping sound. oil was changed after it ran for a few mins after the cam install
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Old 07-05-2008, 08:58 PM   #8
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Default Re: car rattles after cam install then wont start at all!

I'm still learning about engine troubleshooting, but i'd want to have a look at the hedz/valves/etc., and maybe the cam again. *shrugs* i phail :'(
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Old 07-05-2008, 09:25 PM   #9
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Default Re: car rattles after cam install then wont start at all!

well first thing going to do is put a new harmonic balancer in it. my uncle and dad and me are convinced that it is this it started to squeal a bit there....so yeah.
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Old 07-05-2008, 10:00 PM   #10
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Default Re: car rattles after cam install then wont start at all!

Well the harmonic ballancer has teeth so to speak that passes basicly through a magnet wich would be called the crank position sensor. I cant tell anything about what is going on when you say the timing falls off without a scan. So send me a .hpl file if you happen to save it. I have hpt so I will be able to read it...matter o fact post a scan depo scan so everyone can see it.



I could be wrong but i don't think that is your problem...any dtc's
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