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idle issue G13b

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jonno_racing

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Joined: Wed Apr 15, 2009 11:30 pm
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Posted: Mon Jun 20, 2011 12:48 am

ok on the trip to nsw my zook started to have a shit idle, i put it down to blow h/g. but no.
at idle it sounds like it has lumpy cams (it dosnt)
cam timing is perfect.
i just swapped to spare afm and tps
checked for vac leaksthere are none, and cracks in inlet also none..
computer gives no codes.
i am lost...
any ideas?

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jonno_racing

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Posted: Mon Jun 20, 2011 12:49 am

oh also as soon as i bring it off idle it runs smooth as. its just at actual idle 1000rpm that it has issues. i have had to up the idle from 800rpm as it used to just stall out there all the time.

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UBZ

Joined: Sun Nov 16, 2008 10:30 pm
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Posted: Mon Jun 20, 2011 1:05 am

idle air valve?

jonno_racing

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Posted: Mon Jun 20, 2011 1:24 am

they are a manual screw type. not much can go wrong.

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JrZook

Joined: Tue Aug 08, 2006 11:30 pm
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Posted: Mon Jun 20, 2011 2:40 am

jonno_racing wrote:

they are a manual screw type. not much can go wrong.

Whats cold idle speed controlled by? Doesn't it have an idle air bypass valve?

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jonno_racing

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Posted: Mon Jun 20, 2011 2:45 am

yeah it has a cold idle valve that has a thermostat style set up in it. its not the cold start as it does it all the time.

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SierraDan

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Joined: Fri Feb 04, 2011 10:55 pm
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Posted: Mon Jun 20, 2011 4:16 am

Sticky valves?

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shakes

Joined: Sat Apr 10, 2010 11:30 pm
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Posted: Mon Jun 20, 2011 4:41 am

edit: finger worked faster than my brain function. :oops:

jonno_racing

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Posted: Mon Jun 20, 2011 4:50 am

dont think so dan. its not rattling at all.

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SierraDan

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Posted: Mon Jun 20, 2011 7:20 am

G13B?

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Scrawny

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Posted: Mon Jun 20, 2011 7:26 am

How did you check for vacuum leaks? Have you checked the brake booster? Still sounds like a vacuum leak to me

JrZook

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Posted: Mon Jun 20, 2011 8:45 am

Scrawn wrote:

How did you check for vacuum leaks? Have you checked the brake booster? Still sounds like a vacuum leak to me

Yea or air bypassing the throttle body butterfly.

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jonno_racing

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Posted: Mon Jun 20, 2011 12:23 pm

JrZook wrote:

Scrawn wrote:

How did you check for vacuum leaks? Have you checked the brake booster? Still sounds like a vacuum leak to me

Yea or air bypassing the throttle body butterfly.

i think the same. i might disconnect booster tommorow and try.

i checked with the good old spray crc everywhere. nothing.

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