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whats making my car do this (video included) 

 

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 Post subject: whats making my car do this (video included)
Posted: Fri Apr 30, 2010 9:47 pm 
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Hey guys, firstly heres a few video's of what its doin. As u can see its sort of misfiring and not running smoothly (cutting out a cylinder or two?), and also blowing black smoke .


Image


Image

Ok, the car went into the mechanics to get my loud lifters sorted out. I supplied new lifters and he measured valve clearance and came to the conclusion that the head was not done right (the head was done by superflow heads, higher comp and port and polished), he therefore took 20thou off the rocker assembly.

When i came to pick the car up it and we started it, it done whats in the video above . Rough idle, misfiring, and shaking the whole interior of the car. (Also didn't fix my loud tappets). He pointed out that the cam angle sensor (syncronizer) was covered in coolant and the electrical terminal had corroded away. So i've just put in another new one, timed it up and its doing the exact same thing.

so heres the question, what on earth could be causing this? im certain the CAS is right, and its never done this before. Could it be something related to the job that was done (taking 20thou off the rockers)

Oh and this was no dodgy mechanic, he is a well respected and known falcon mechanic.
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 Post subject: Re: whats making my car do this (video included)
Posted: Fri Apr 30, 2010 11:41 pm 
Getting Side Ways
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took some off the rocker assembly?why?
maybe now the valves dont fully close,causing the excess fuel,and poor running?

 

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 Post subject: Re: whats making my car do this (video included)
Posted: Sat May 01, 2010 12:22 am 
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Cant say I've ever heard of someone skimming the rockers on a 4.0 before :?
Did you ask him about how he came to his conclusion? regrind cam?
It could possibly be a vacuum leak but... I wouldnt have drove the car home in that state - tell him you f**k it up, you fix it.

 

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 Post subject: Re: whats making my car do this (video included)
Posted: Sat May 01, 2010 12:42 am 
Getting Side Ways
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yeh its a regrind cam, and two shims wasn't enough.

vacuum leak? what makes u say that? ill have a look tomorrow and see if i can see any hoses split or something.


madeaspack: i've been thinking the exact same thing! I might have to get another rocker assembly and see if it fixes it?
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 Post subject: Re: whats making my car do this (video included)
Posted: Sat May 01, 2010 12:51 am 
Getting Side Ways
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your engine is running like a HAIRY GOAT>>>>>

Go too the wreckers and get a stock cam and rocker gear assembly, install that and at least your car will be running again.. Your mechanic has f*cked something up and probably doesn't what too see you again.

Map sensor hose still attached???

 

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 Post subject: Re: whats making my car do this (video included)
Posted: Sat May 01, 2010 9:59 am 
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Was the cam chain tensioner reset properly????....is the synchronizer set properly???
Are the leads on the right way??? MAP sensor OK??? Intake manifold gasket OK???

 

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 Post subject: Re: whats making my car do this (video included)
Posted: Sat May 01, 2010 10:53 am 
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Check MAP sensor vacuum

 

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 Post subject: Re: whats making my car do this (video included)
Posted: Sat May 01, 2010 11:00 am 
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doesnt even sound like its running on all cylinders
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 Post subject: Re: whats making my car do this (video included)
Posted: Sat May 01, 2010 11:23 am 
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Check MAP sensor. Does it continue making the noises if you rev it up above 1000 rpm? if it stops, check the throttle body

 

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 Post subject: Re: whats making my car do this (video included)
Posted: Sat May 01, 2010 2:35 pm 
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2 tests.
1. Spray aero start accross all possible vacume leak areas, revs will pickup if you spray where there is a leak.
2. Do a compression test to check that the valves are closing.

 

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 Post subject: Re: whats making my car do this (video included)
Posted: Sat May 01, 2010 8:29 pm 
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MadMatt wrote:
1. Spray aero start accross all possible vacume leak areas, revs will pickup if you spray where there is a leak.


hopefully theres no arcing on the coil or coilpack
use water or crc, may avoid fires
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 Post subject: Re: whats making my car do this (video included)
Posted: Sun May 02, 2010 12:33 am 
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yeah map sensor hose off will make it run s**t

 

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 Post subject: Re: whats making my car do this (video included)
Posted: Sun May 02, 2010 8:39 am 
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if it only started doing it after the rockers were messed with i would say there is a clearence issue..
i would fit another rocker assembly and see what happens...

i cant see how maching of the head surface or porting would have any effect on the rockers...
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