vn idle problems - Aussie V8 | Holden - Ford

richo · 30-08-2008, 08:41 AM

my svle vn 5.0L,
first thing of a morning it fires up ok runs sweet but when she warms up it runs weired when idle'n from 400rpm to 1000rpm,up and down,, it won't level or even to one spot, after driving when i pull up at a intersection or lights it nearly stalls off then same thing, up down, it's a five speed manual, the exhaust is 2.5"inch bolt on pacemaker tri y's, cat has been gutted out (just a case) and rear res has been chopped out and replaced with stainless.

3554me · 30-08-2008, 09:32 AM

mine's a auto and it does the same ever since i did a little grass event (by accident)
it's revs wont stabilize ,it's also doing a brake booster prob where after not driving it for
a week as soon as u hit the brakes the pedel sinks and it take a few hard stops to get
it normal so i'll be looking at the vacuum side of things 1st and see how i go,

CK_318 · 30-08-2008, 10:13 AM

try the fuel pressure regulator, my V6 on petrol does the same thing. surges and carries on like a 3 legged dog. block of the return line to bring up the fuel pressure for a bit and give it a rev. if it runs smooth after that has been done, it has shit in it and probably needs a new fuel filter. hope that helps

richo · 30-08-2008, 12:49 PM

Quote:

Originally Posted by CK_318

try the fuel pressure regulator, my V6 on petrol does the same thing. surges and carries on like a 3 legged dog. block of the return line to bring up the fuel pressure for a bit and give it a rev. if it runs smooth after that has been done, it has shit in it and probably needs a new fuel filter. hope that helps

it definatley not that.my car doesn't surge at all, the question was asked about it won't idle properly. i think that 3554me is con the money, vacum
, i should've thought that, these cars are getting on a bit now, she's 20 next year

3554me · 30-08-2008, 01:14 PM

mine still goes way over the speed limit without any probs like surges and splutters ,
and the temp stay just under half ,so i'm shying away from vac and going to check the
tps as soon as i work out how to check it , i have a multimeter but lack any knowledge
but i'm not ruling out a vac drama just looking at more things that could be wrong

terrytappet · 30-08-2008, 01:19 PM

hi have you had idle stepper motor out and cleaned it get black gum were it seals against.

3554me · 30-08-2008, 01:21 PM

Quote:

Originally Posted by terrytappet

hi have you had idle stepper motor out and cleaned it get black gum were it seals against.

sorry terry i have no idea what the stepper looks like or is

terrytappet · 30-08-2008, 01:32 PM

under neath throttle body just behind butterfly,there is black oval wiring plug three wires going into it,that wear stepper motor is,held in with two little screws,remove it clean with petrol or carby cleaner,you may have to take throttle body off first,only two 13 mm nuts

3554me · 30-08-2008, 01:42 PM

thanks terry will look into it when i get some more time, do i need to have a
new gasket or anything before i start rippin stuff off always helps to be prepared

terrytappet · 30-08-2008, 01:45 PM

may sure you clean inside of throttle body out as well

PVE · 30-08-2008, 04:45 PM

Quote:

Originally Posted by 3554me

.....tps as soon as i work out how to check it , i have a multimeter but lack any knowledge
..............

With the key switched on you should have 0 to 0.9v at closed throttle, and 4.9v at wide open throttle.

Black with yellow stripe is earth (Via ECM).
Grey is 5volt supply (from ECM).
Blue is the wire that should have the above mentioned volts (signal to the ECM).

You measure the voltage between black/yellow wire and the blue. You can also check the black/yellow to a good earth. A major variation would indicate a poor earth somewhere.

EFI systems develop all types of problems with bad earths.

PVE · 30-08-2008, 04:59 PM

I would be cleaning the Idle Stepper Motor, making sure it works by keyon/keyoff test.
Then check for vacuum leak. Manifold bolt tension, leaking hoses and gaskets.

CK_318 · 31-08-2008, 02:29 PM

Quote:

Originally Posted by richo

it definatley not that.my car doesn't surge at all, the question was asked about it won't idle properly. i think that 3554me is con the money, vacum
, i should've thought that, these cars are getting on a bit now, she's 20 next year

fair enough, mines 20 this year

and mine surges and won't idle properly either thats why i suggested it. coz i did that to mine and it fixed it for a few days. i just don't have teh money for a new regualtor

30-08-2008, 08:41 AM	#1 (permalink)
richo Just Me & Me Tools Trade Rating: (0) Join Date: Dec 2006 Location: hunter valley Ride: hqcoupe ute 350chev, vk355 calais Posts: 300	vn idle problems my svle vn 5.0L, first thing of a morning it fires up ok runs sweet but when she warms up it runs weired when idle'n from 400rpm to 1000rpm,up and down,, it won't level or even to one spot, after driving when i pull up at a intersection or lights it nearly stalls off then same thing, up down, it's a five speed manual, the exhaust is 2.5"inch bolt on pacemaker tri y's, cat has been gutted out (just a case) and rear res has been chopped out and replaced with stainless.

30-08-2008, 10:13 AM	#3 (permalink)
CK_318 my shoulder is watching U Trade Rating: (0) Join Date: Jan 2006 Location: Muswellbrook NSW Ride: VN V6 Executive Posts: 4,014	try the fuel pressure regulator, my V6 on petrol does the same thing. surges and carries on like a 3 legged dog. block of the return line to bring up the fuel pressure for a bit and give it a rev. if it runs smooth after that has been done, it has shit in it and probably needs a new fuel filter. hope that helps __________________ Puppy eyes hide the sick mind behind

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30-08-2008, 09:32 AM	#2 (permalink)
3554me casual poster Trade Rating: (3) Join Date: Apr 2008 Location: qld Ride: hz,vn,vk,fb Posts: 385	mine's a auto and it does the same ever since i did a little grass event (by accident) it's revs wont stabilize ,it's also doing a brake booster prob where after not driving it for a week as soon as u hit the brakes the pedel sinks and it take a few hard stops to get it normal so i'll be looking at the vacuum side of things 1st and see how i go,

30-08-2008, 01:14 PM	#5 (permalink)
3554me casual poster Trade Rating: (3) Join Date: Apr 2008 Location: qld Ride: hz,vn,vk,fb Posts: 385	mine still goes way over the speed limit without any probs like surges and splutters , and the temp stay just under half ,so i'm shying away from vac and going to check the tps as soon as i work out how to check it , i have a multimeter but lack any knowledge but i'm not ruling out a vac drama just looking at more things that could be wrong

30-08-2008, 01:19 PM	#6 (permalink)
terrytappet casual poster Trade Rating: (0) Join Date: Aug 2008 Location: newcastle Ride: vt Posts: 32	hi have you had idle stepper motor out and cleaned it get black gum were it seals against.

30-08-2008, 01:32 PM	#8 (permalink)
terrytappet casual poster Trade Rating: (0) Join Date: Aug 2008 Location: newcastle Ride: vt Posts: 32	under neath throttle body just behind butterfly,there is black oval wiring plug three wires going into it,that wear stepper motor is,held in with two little screws,remove it clean with petrol or carby cleaner,you may have to take throttle body off first,only two 13 mm nuts

30-08-2008, 01:42 PM	#9 (permalink)
3554me casual poster Trade Rating: (3) Join Date: Apr 2008 Location: qld Ride: hz,vn,vk,fb Posts: 385	thanks terry will look into it when i get some more time, do i need to have a new gasket or anything before i start rippin stuff off always helps to be prepared

30-08-2008, 01:45 PM	#10 (permalink)
terrytappet casual poster Trade Rating: (0) Join Date: Aug 2008 Location: newcastle Ride: vt Posts: 32	may sure you clean inside of throttle body out as well

30-08-2008, 04:59 PM	#12 (permalink)
PVE casual poster Trade Rating: (0) Join Date: May 2008 Location: Perth Ride: Holden Posts: 305	I would be cleaning the Idle Stepper Motor, making sure it works by keyon/keyoff test. Then check for vacuum leak. Manifold bolt tension, leaking hoses and gaskets.

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