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Lsj Throttle Body Troubleshooting


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#101 Bargi

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Posted 27 March 2015 - 05:57 PM

We'll the logs say there's misfires :)

What's interesting is it's 2 and 4 doing it really badly with very little in comparison from 1 and 3.

The way the coil pack fires is in pairs, 1&4 and 2&3 here. If just a pair was affected I'd say one of coils was def pooched.

I'd still try a working coil pack though to at least eliminate it.

 

 



#102 Exmantaa

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Posted 27 March 2015 - 09:36 PM

Yeah, misfires indeed...

 

Just playing with your logs and something strange (to me) with the MAP reading; if your TB opens and the revs raise, your MAP reading goes slightly lower... 

The (absolute pressure) MAP reading is lowest (around 30-40kPa) @ idle and should raise with opening the TB. But could be that your cam playing up there and breathing is simply better with some revs, as 47kPa @ idle is quite high. Or you have an airleak somewhere? I don't have OBD in my car, so cannot compare how MAP is supposed to behave with some SC cams.

 

The MAP reading lowers correctly further on closing the throtle and with engine off it reads a correct 100kPa-ish.

 






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