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G16B running rich and idling high
Posted: Tue Mar 03, 2009 9:47 pm
by Taff
Just finished my G16B conversion into my sierra.
It ran great for the first day but now its idling high and running rich. checked all my sensors and wires and everything seems to be ok. the fuel pressure regulator is hooked up properly and seems to be working. Using the stock vitara fuel pump. the only thing i can find wrong is a hole in the manifold.
any pointers where to look for whats causing this?
Posted: Wed Mar 04, 2009 7:36 am
by lay80n
How is the coolant temp sensor for the engine ECU? Check its not reading bad and keeping the motor in cold start maps? Do you have any vacuum or exhaust leaks?
Layto....
Posted: Wed Mar 04, 2009 11:57 am
by nicbeer
whats it idleing at? and have u got a air/fuel meter on it?
and is it hunting revs or staying constant?
Posted: Wed Mar 04, 2009 4:17 pm
by Taff
coolant temp sensor is hooked up correct
there is a hole in the exhaust manifold right near #4 cylinder.
will recheck for vac leaks.
it is idling at 1500-2000 constant.
when its fully warmed up or cold it has a constant idle but in between it will bounce from 1800-2000 like it is switching fuel maps.
Posted: Wed Mar 04, 2009 10:12 pm
by mr green
block off your pcv valve and see what happens. sounds like one i was playing with a while ago. might have had a bit much blow by and the engine was being force fed crankcase fumes, i think we put a restricter in the line from memory
Posted: Thu Mar 05, 2009 7:30 am
by lay80n
Check your idle air control valve too, make sure its not full of crud. Do you have an air flow meter, if you do check that you dont have any vacuum leaks after the air flow meter. This will cause high rough idle. If you dont have and AFM ( i cant remember if the G16B does or not
) then make sure your MAP sensor connections are good and the vacum line is not leaking.
Layto....
Posted: Thu Mar 05, 2009 9:14 am
by HRZOOK
Posted: Sat Mar 07, 2009 5:58 pm
by Taff
turns out the hose from the IAC valve to the thermostat was blocked up with lots of brown goop. cleared it out and now its running fine.
still need some extractors though.
Posted: Sat Mar 07, 2009 7:14 pm
by zooker
Taff wrote:still need some extractors though.
Hurricane brand
$240, fit perfect
Posted: Sat Mar 14, 2009 11:11 am
by Taff
still running stupidly rich. used 32L over 180km so its sucking it down.
black smoke at idle.
only error code I'm getting is for the VSS.
how do you check a fuel pressure regulator is working correctly?
is it worth getting a new coolant temp sensor for the ECU? is there an easy check for this as well?
its all stock computer / fuel pump / tank
Posted: Sat Mar 14, 2009 4:11 pm
by Taff
turned out to be the inlet side of the AFM was being pinched a little bit by the hose clamp and not letting it spring all the way back.
soooo soo much more responsive off idle now, its not drowning
