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nismo_sss
Starting in the driveway
2 Posts
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 Posted - 11 Oct 2005 : 11:38:53 AM
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 hey pplz my vn series 1 v6 wont idle properly sometimes... it goes up & down & nearly stalls but doesn't & sometimes is very hard to start .. it turns over & just wont start then i hit the key again & it fires straight away, and other times it starts after about 1 second first go, it has a new fuel pump (12 months old) & has pretty much always done it and i have had it for 2 1/2 years now, i just put a cold air kit & a k&n filter in it ... it didnt make any difference to the starting as i thought it wouldnt anyway ... it's had a manual conversion done & still has the automatic chip in it would this be the problem? i have tried a mates manual chip in the computer & as far as i could tell the only difference it made was it went better but still did the same thing! could it be the fuel pressure regulator? i have been told that this could be the problem & i went to holden to price a new one & they want $200+ for one and one of my mates said he went through 3 fuel pressure regulators from wreckers & got sick of replacing it & went & got a new one instead... does anyone know of an easy fit universal one that i can use? sorry bout the long post but i really dont know what to do ....
cheers
Matt
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Chezza
Central North Coast Sporting Car Club
www.cncscc.com |
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mouce
National Driver
1525 Posts
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Posted - 12 Oct 2005 : 8:41:48 PM
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If it were the fuel pressure regulator it would be a bitch when it's running as well. Since it's only hard to start and idle is a little strange...could be lots of things.
If it's always hard to start first thing (eg after it's sat overnight), then I'd say that you have a bit of an injector problem. Might be leaking injectors which just dribble into the cylinders thus flooding the engine. Could be a coil pack issue. But since it's not getting worse I doubt it. Next step would be leads/plugs. Get those checked.
As to the really crap idle sometimes and not others, clean your throttle body and idle air control valve. Rip it out, and wipe it all out with a rag soaked in carby cleaner to get it nice and shiny again. If yours is anything like mine was the IAC valve hadn't been touched in 17 years. It was caked in crap, couldn't move at all. Once I cleaned that up (and reset the computer, and fixed the vacuum leaks) it all came good.
If you want any more ideas let me know. There's plenty more options. |
Bite off more than you can chew, and chew like hell - Peter Brock (1945-2006) |
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nismo_sss
Starting in the driveway
2 Posts
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Posted - 12 Oct 2005 : 10:52:22 PM
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mouce,
in regards to it running crappy (which i forgot to mention in the first post)all the time it does somketimes but not all the time ..... & at times when just crusing say at 60 just touching the throttle, it lightly jumps like a fuel surge or somthing along those lines, i have done the throttle body 3 or 4 times now & reset the computer each time & it still didnt make any difference ... or if it did it wasn't for very long!
Cheers
Matt |
Chezza
Central North Coast Sporting Car Club
www.cncscc.com |
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mouce
National Driver
1525 Posts
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Posted - 13 Oct 2005 : 3:11:08 PM
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It could be a fuel pressure issue, but the computer compensates for raised fuel pressure fairly well. Get a fuel pressure gauge from a mate and test it out. Failing that, you can pick up a little one from repco fairly cheap. (I'm not talking about an in car one, I'm talking about one you plug into the fuel line with the bonnet open and hold in your hand), see what the fuel pressure is at idle, and see if it's stable.
Since it's causing problems when you're actually moving as well, test the throttle position sensor. When you've cleaned it, if you've gotten any of the cleaner in there (and it's damn easy to do), it can stuff it up pretty well. Replacement ones aren't that expensive either so it's fairly cheap if it's busted. Get a multimeter and a service manual (Gregory's is a good one)test it to see if it's gone.
When was the last time you changed your fuel filter? |
Bite off more than you can chew, and chew like hell - Peter Brock (1945-2006) |
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No Longer Member
deleted
16 Posts
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Posted - 15 Oct 2005 : 4:30:57 PM
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blocked fuel filter , shagged pump , crank angle sensor etc could be the culprit.
have you tested for fault codes? |
Take it easy, if its easy take it! |
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