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eatSScommos
Starting in the driveway
4 Posts
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 Posted - 07 Jan 2008 : 3:42:33 PM
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Hi all,
Have just been reading the posts the last coupla days in an attempt to rectify problem with my VN. My car is a Vn Calais 355 Stroker. Manual.
A few things;
1) When I pull up at the lights my idle will drop down to sometimes as low as 250 RPM - sometimes it stalls and this seems to be more frequent.
2)The car is duel fuel but I have recently noticed that it seems to be using more fuel. ie 240k to a tank of LPG when it used to get around 300k.
3)It seems to be running rough - it feels like its misfiring or running on 7 cylinders. Thats the best way I can describe it! It does seem to get better when warmed up.
I have replaced spark plugs, got a computer from the wrekers and plugged that it (just changed the memcal over).
Im a bit broke at the moment (that time of year) and was wondering if any of you fellas would be able to advise me as to what I should replace etc before I bite the bullet and pay big bucks for someone to look at it.
Thanks in advance!!!
Frank.
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trizo
Forum Moderator
3091 Posts
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Posted - 07 Jan 2008 : 9:22:00 PM
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maybe the rubbers and seals are starti to perish a bit on ya lpg system they need a bit of a lube up by running petrol every now and then !! By the way welcome to the club m8 hang in there I'm sure a few more guys will hit this thread yet  |
3 can keep a secret if 2 are dead |
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MILD50
Fully Licenced
850 Posts
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Posted - 08 Jan 2008 : 12:44:07 PM
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It's possible there's more than one drama there but hopefully it'll be an easy fix.
Firstly, look at cleaning the IAC as it could be affecting your idle. You can try doing it without removing it from the throttle body using some throttle body cleaner and throwing it into the IAC recess thing. Other than that- and the better way- is to remove it, clean it and refit it but you'll probably need as new gasket for it.
Then, I'd check your plugs to see if they are fouled at all- it could be a dodgy plug but that might be a bit of wishful thinking. Worth a look anyway.
Other than those two it sounds almost spot on to what mine did when the ignition module **** itself. Try those top two options first for a cheap fix but if you have no luck I'd be testing the ignition module and coil mate...just get a refurb'd module for under $200 rather thana factory new one for over $400 if that's the case.
Good luck with it and let us know how you go. |
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eatSScommos
Starting in the driveway
4 Posts
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Posted - 08 Jan 2008 : 1:03:45 PM
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Hi all,
Thanks for replies so far.
I have replaced coil. And also took the Idle Control motor out from the throttle body and sprayed it with WD40. I managed to re use the gasket. I assume this is what you fellas refer to as the IAC???
It still is idling weird ie. drops down to around 250 rpm at lights then with a tap of the accelerator it settles around factory idle!??
At the moment I'm ordering in a new idle control motor and O2 sensor. Ill try those first. If that doesn't work I guess im looking at an ignition module ( where do i get the cheap ones??).
Any other advice from members would still be appreciated.
I'm still hopeful of it being something minor!!
Cheers
Frank.
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MILD50
Fully Licenced
850 Posts
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Posted - 08 Jan 2008 : 3:37:49 PM
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Sorry... just saw you have changed the plugs.
I got my recondtioned module in Darwin but if you speak to a few auto-elecs someone should be able to point you in the right direction in your state.
Best of luck with it mate- oh and yeah, thats what we mean by IAC ;) |
Edited by - MILD50 on 08 Jan 2008 3:41:05 PM |
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nodg
National Driver
1667 Posts
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Posted - 09 Jan 2008 : 01:50:10 AM
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| wd40 isnt recommended in the throttle body you should have used fuel or carby cleaner, could be inlet/exhaust leak, any 1 of the ines sensors which include, air temp sensor, coolant sensor, 02 sensor, map sensor but i would lean towards the first few and leave the map as it doesnt sound like your problem! |
Cheers,
Nodg. |
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eatSScommos
Starting in the driveway
4 Posts
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Posted - 09 Jan 2008 : 1:14:25 PM
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thanks for replies.
at the moment i know how to replace IAC control - thats it.
where are all the other sensors? 02, temp, and coolant. do you think these can really cause erratic idle, ruff running and poor economy??
thanks |
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jas89
Forum Moderator
779 Posts
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Posted - 09 Jan 2008 : 6:08:32 PM
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the o2 sensor and colent temperature sensors can cause this.......the temperature sensor however has nothing to do with the engine performance....it only reads the temperature for the guage
where they are loacated....wouldnt have a clue on a v8...sorry |
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