GTR Base timing, idle stumble please help - GT-R Register - Official Nissan Skyline and GTR Owners Club forum

canadian · 21st July 2006, 01:31 AM

1989 R32 GTR Power FC (base map/settings) 800 cc sard injectors.

I am wraping up a two year buildup, fuel pressure is not adj yet.

I have been trying to adjust the timing of my gtr after a buildup. Idle is eratic so i unplugged the acc and adusted the idle screw to get the idle roughly around 950 + or - 10 rpm. then i hook up a Innova timing light to the 1st cyl loop by the ignition module at back of cam cover. it looks as if the timing is at 45-50 deg btdc. what am i doing wrong. i will try to run a spark lead from the coil to plug and attempt that way. any other ideas. duz PFC make any changes to takeing a base timing reading? also between full LH and RH actuation of the CAS it only adjusts between 30 deg btdc and 50 deg btdc on crank.

I have 800cc sard injectors, should i expect to have a slight stumble at idle with these injectors. (Base fuel press no adj yet, timing not spot on but not off by much either, PFC running on base map). stumble is not present off idle

Hugh Keir · 21st July 2006, 08:39 AM

There can be significant difficulty in getting the timing light to correctly pick up the timing pulse.

If you are using a snap on light leave the pickup clamp open.

R32 Combat · 21st July 2006, 09:35 AM

Remove coil 1 and fit a short HT lead between the coil and the plug. The clip the timing light around the HT lead. This will give you an accurate reading.

Like Hugh said, the pickup wire doesn't work correctly exept with the Nissan timing light.

canadian · 26th July 2006, 04:57 AM

worked great thanks, now to figure out the high idle

jza80 · 1st August 2006, 04:47 AM

A snap-on light will work great if you leave the pickup open around the lead.

What is your high idle problem?

21st July 2006, 01:31 AM	#1 (permalink)
canadian GTR Register Member Join Date: Oct 2003 Location: Coquitlam, BC, Canada Posts: 104	GTR Base timing, idle stumble please help 1989 R32 GTR Power FC (base map/settings) 800 cc sard injectors. I am wraping up a two year buildup, fuel pressure is not adj yet. I have been trying to adjust the timing of my gtr after a buildup. Idle is eratic so i unplugged the acc and adusted the idle screw to get the idle roughly around 950 + or - 10 rpm. then i hook up a Innova timing light to the 1st cyl loop by the ignition module at back of cam cover. it looks as if the timing is at 45-50 deg btdc. what am i doing wrong. i will try to run a spark lead from the coil to plug and attempt that way. any other ideas. duz PFC make any changes to takeing a base timing reading? also between full LH and RH actuation of the CAS it only adjusts between 30 deg btdc and 50 deg btdc on crank. I have 800cc sard injectors, should i expect to have a slight stumble at idle with these injectors. (Base fuel press no adj yet, timing not spot on but not off by much either, PFC running on base map). stumble is not present off idle

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21st July 2006, 08:39 AM	#2 (permalink)
Hugh Keir GTR Register Member Join Date: Jul 2001 Location: Aberdeen Scotland Posts: 1,545	There can be significant difficulty in getting the timing light to correctly pick up the timing pulse. If you are using a snap on light leave the pickup clamp open.

21st July 2006, 09:35 AM	#3 (permalink)
R32 Combat New Users Join Date: Jan 2004 Location: Berkshire Posts: 4,357	Remove coil 1 and fit a short HT lead between the coil and the plug. The clip the timing light around the HT lead. This will give you an accurate reading. Like Hugh said, the pickup wire doesn't work correctly exept with the Nissan timing light.

26th July 2006, 04:57 AM	#4 (permalink)
canadian GTR Register Member Join Date: Oct 2003 Location: Coquitlam, BC, Canada Posts: 104	worked great thanks, now to figure out the high idle

1st August 2006, 04:47 AM	#5 (permalink)
jza80 GTR Register Member Join Date: Oct 2002 Location: So. Orange County, USA Posts: 280	A snap-on light will work great if you leave the pickup open around the lead. What is your high idle problem?