IDLE/TIMING PROBLEM - GT-R Register - Official Nissan Skyline and GTR Owners Club forum

montzz32gtr · 10th July 2008, 08:57 PM

HI GUYS ,
I HAVE A FEW PROBS WITH MY 1990 R32 GTR BASICALLY I REPLACED MY EXHAUST MANIFOLDS TURBO ELBOWS FOR UPRATED ONES AND ALSO TOOK OFF AIRCON AND RECURC SYSTEM BUT NOW EVEN THOUGH ENGINE STARTS FINE IT IDLES AT 1150-1250RPM AND SEEMS TO HUNT TO , TODAY I CHECKED THE TIMING WITH TIMING LIGHT AND AT IDLE THE TIMIMG SEEMED TO JUMP ABOUT A BIT SAY FROM 20 TO 30 DEGREE BTDC

MODIFICATIONS ARE AS ABOVE AND NISMO LEMANS TURBOS , ADJUSTABLE ACTUATERS ,HARD PIPES, M S FACTORY AIR FILTER WIDER HOLDERS , K & N AIR FILTERS , TRUST INTERCOOLER , OIL CATCH TANK , 550CC INJECTORS, OIL FILTER RELOCATION KIT, ALL TURBO BRAIDED PIPES, PROFEC B 2 BOOST CONTROLLER, ALLY RAD ,UPRATED LARGE EXHAUST DOWNPIPE AND EXHAUST , ALSO NO CAT (NOT SURE IF 1990 CARS CAME WITH A CAT!)
ALSO WHILE TRYING TO SET UP BOOST CONTROLLER ON HIGH BOOST 1BAR I THINK I NOTICED ENGINE PINKING (PRE DET)!!

ANY ADVICE WOULD BE VERY APPRECIATED

montzz32gtr · 11th July 2008, 11:45 AM

OK I HAVE GOT THE ENGINE TO IDLE AT 900 RPM THIS MORNING BY ADJUSTING AAC VALVE SCREW, THROTTLE SENSOR,AND THROTTLE LINKAGE, BUT IDLE IS STILL HUNTING A BIT ,I CHECKED TIMING AGAIN AND AT 900RPM SOMETIMES IT SITS PERFECT AND OTHER TIMES ITS FLICKING BETWEEN 17 DEGREES AND 23 DEGREES BTDC !
ANYONE ! ANY IDEAS?

beaumackenzie · 14th July 2008, 03:14 AM

ok firstly you see the button on your key board that says CAPS LOCK yeah, that one, use it!

put all your sensors back where they were.
you have a vacum/boost leak, recheck all of your joins and possibly even silicone them then stick the pipes and clamps back on.

montzz32gtr · 14th July 2008, 10:49 AM

Hi thanks for reply , when you say sencers back it allways did idle a bit fast so i followed the r32 gtr manual on fast idle but i guess that when vaccum leak is fixed it may drop even lower due to me adjusting it ,could the aac valve be sticking/faullty would that cause timimg to jump about? im pretty dam sure ive no boost leak as i renewed all boost pipes and clamps recently quite poss a vaccum leak though as ive also recently took off recurc pipes and put on profec b boost controller , i was going to buy a blazt cable to connect ecu to my laptop do you know if the fault would show up on that? many thanks steve

beaumackenzie · 15th July 2008, 02:09 AM

you answered the question yourself with that last paragraph.

montzz32gtr · 15th July 2008, 07:27 AM

hi, checked aac valve and seems fine also compressed plentum intake to 1 bar by taking out temp sensor and found no leaks ,this is really p**sin me off now lol, still is jumping few degrees and hunting (rpm going up and down) on idle arrrrrrrrrrrrr wheres my big hammer!

10th July 2008, 08:57 PM	#1 (permalink)
montzz32gtr GTR Register Member Join Date: May 2007 Posts: 140	IDLE/TIMING PROBLEM HI GUYS , I HAVE A FEW PROBS WITH MY 1990 R32 GTR BASICALLY I REPLACED MY EXHAUST MANIFOLDS TURBO ELBOWS FOR UPRATED ONES AND ALSO TOOK OFF AIRCON AND RECURC SYSTEM BUT NOW EVEN THOUGH ENGINE STARTS FINE IT IDLES AT 1150-1250RPM AND SEEMS TO HUNT TO , TODAY I CHECKED THE TIMING WITH TIMING LIGHT AND AT IDLE THE TIMIMG SEEMED TO JUMP ABOUT A BIT SAY FROM 20 TO 30 DEGREE BTDC MODIFICATIONS ARE AS ABOVE AND NISMO LEMANS TURBOS , ADJUSTABLE ACTUATERS ,HARD PIPES, M S FACTORY AIR FILTER WIDER HOLDERS , K & N AIR FILTERS , TRUST INTERCOOLER , OIL CATCH TANK , 550CC INJECTORS, OIL FILTER RELOCATION KIT, ALL TURBO BRAIDED PIPES, PROFEC B 2 BOOST CONTROLLER, ALLY RAD ,UPRATED LARGE EXHAUST DOWNPIPE AND EXHAUST , ALSO NO CAT (NOT SURE IF 1990 CARS CAME WITH A CAT!) ALSO WHILE TRYING TO SET UP BOOST CONTROLLER ON HIGH BOOST 1BAR I THINK I NOTICED ENGINE PINKING (PRE DET)!! ANY ADVICE WOULD BE VERY APPRECIATED

14th July 2008, 10:49 AM	#4 (permalink)
montzz32gtr GTR Register Member Join Date: May 2007 Posts: 140	no caps here! Hi thanks for reply , when you say sencers back it allways did idle a bit fast so i followed the r32 gtr manual on fast idle but i guess that when vaccum leak is fixed it may drop even lower due to me adjusting it ,could the aac valve be sticking/faullty would that cause timimg to jump about? im pretty dam sure ive no boost leak as i renewed all boost pipes and clamps recently quite poss a vaccum leak though as ive also recently took off recurc pipes and put on profec b boost controller , i was going to buy a blazt cable to connect ecu to my laptop do you know if the fault would show up on that? many thanks steve

15th July 2008, 07:27 AM	#6 (permalink)
montzz32gtr GTR Register Member Join Date: May 2007 Posts: 140	aac valve hi, checked aac valve and seems fine also compressed plentum intake to 1 bar by taking out temp sensor and found no leaks ,this is really p**sin me off now lol, still is jumping few degrees and hunting (rpm going up and down) on idle arrrrrrrrrrrrr wheres my big hammer!

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11th July 2008, 11:45 AM	#2 (permalink)
montzz32gtr GTR Register Member Join Date: May 2007 Posts: 140	OK I HAVE GOT THE ENGINE TO IDLE AT 900 RPM THIS MORNING BY ADJUSTING AAC VALVE SCREW, THROTTLE SENSOR,AND THROTTLE LINKAGE, BUT IDLE IS STILL HUNTING A BIT ,I CHECKED TIMING AGAIN AND AT 900RPM SOMETIMES IT SITS PERFECT AND OTHER TIMES ITS FLICKING BETWEEN 17 DEGREES AND 23 DEGREES BTDC ! ANYONE ! ANY IDEAS?

14th July 2008, 03:14 AM	#3 (permalink)
beaumackenzie GTR Register Member Join Date: Jan 2008 Location: P.N NZ Posts: 319	ok firstly you see the button on your key board that says CAPS LOCK yeah, that one, use it! put all your sensors back where they were. you have a vacum/boost leak, recheck all of your joins and possibly even silicone them then stick the pipes and clamps back on.

15th July 2008, 02:09 AM	#5 (permalink)
beaumackenzie GTR Register Member Join Date: Jan 2008 Location: P.N NZ Posts: 319	you answered the question yourself with that last paragraph.