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Cold start/idle issues 4.2 lse

 
 
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tc1
Winch Assistant


Joined: 24 Sep 2007
Odometer: 71




PostPosted: Wed Dec 29, 2010 2:08 pm    Post subject: Cold start/idle issues 4.2 lse Reply with quote

Im having a few issues with cold start/idle on my lse, a bit of history first:

Both heads rebuilt with new guides,4 angle cut on the seats,inlet throats cleaned up combution chambers polished. Piston crowns polished, Double s sports exhaust fittted (manifold back) headers wrapped with thermal bandage, K&N filter fitted with forced cold air induction, throttle butterfly polished plenum intake polished Lambda probes removed and tune resistor fitted(Green 470Ohm UK non-cat). It has also had new plugs,cap,rotorarm,stat and thermo time switch and timming set to 8Btdc as in the lr book.

Now to the problem for the first few weeks after the rebuild it ran nicley (all be it juicy) now since the cold snap it starts reluctantly then runs rough unless i give it some throttle after about 3 minutes like that it will idle but tries to stall if i put in gear or on occasion when on full lock and in gear. So does any one have any thoughts on this one??

__________________________________
www.theawarecampaign.co.uk

'95 300tdi disco 3door
'94 4.2 lse classic
'93 Rover 820 vittesse sport
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4x4menow
Articulating


Joined: 02 Apr 2004
Odometer: 553
Location: stroud



PostPosted: Wed Dec 29, 2010 6:43 pm    Post subject: Reply with quote

Try New plugs worked for me on my 4ltr
Was hard to start in the cold new plugs starts first time
heers Nick
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tc1
Winch Assistant


Joined: 24 Sep 2007
Odometer: 71




PostPosted: Wed Dec 29, 2010 10:14 pm    Post subject: Reply with quote

plugs have only done 500 miles tops?
__________________________________
www.theawarecampaign.co.uk

'95 300tdi disco 3door
'94 4.2 lse classic
'93 Rover 820 vittesse sport
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Chris Ennis
Just got MTs


Joined: 05 Oct 2004
Odometer: 349
Location: rossendale lancs


1992 Range Rover 3.9 Vogue SE

PostPosted: Wed Dec 29, 2010 11:42 pm    Post subject: Reply with quote

vac advance, check its sucking and that the pipes not spit,

IIRC they do have a coldstart feature on them, unsure what it is but i'm sure i read somewhere about it,

i'd also check nothings come loose, ie potentiometer, dizzy, oh and did you use a genuine dizzy cap

chris
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tc1
Winch Assistant


Joined: 24 Sep 2007
Odometer: 71




PostPosted: Thu Dec 30, 2010 8:04 am    Post subject: Reply with quote

No obvious leaks in vac system dizzy cap not an lr one but intermotor
__________________________________
www.theawarecampaign.co.uk

'95 300tdi disco 3door
'94 4.2 lse classic
'93 Rover 820 vittesse sport
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Chris Ennis
Just got MTs


Joined: 05 Oct 2004
Odometer: 349
Location: rossendale lancs


1992 Range Rover 3.9 Vogue SE

PostPosted: Thu Dec 30, 2010 10:40 am    Post subject: Reply with quote

have you still got your old cap, maybe give that a try

i'd definatly try and get a lucas one for it though, i've had intermotor caps fail within a couple of weeks
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fixit
Just got MTs


Joined: 29 Jan 2008
Odometer: 387
Location: Sunny snowy rain devon and thats just today



PostPosted: Fri Dec 31, 2010 8:51 am    Post subject: Reply with quote

Fuel mixture could be a bit rich if its worse in the cold and its jucey at the best of times

Pull the plugs and have a look the deposit on the end will tell you a lot

There used to be a colour pic in the front of a haynes manual(bible of lies) the only colour page in fact To help explain hope that helps
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fixit
Just got MTs


Joined: 29 Jan 2008
Odometer: 387
Location: Sunny snowy rain devon and thats just today



PostPosted: Fri Dec 31, 2010 8:56 am    Post subject: Reply with quote

Ps don't just pull one

I used to run a boxer carb set up with 4 SU Carbs Sh*t Hot when it was set right but a pain in the ass to set 4 carbs the same

And it would drink petrol like there was a hole in the tank Shocked Laughing

But fun to boot Twisted Evil
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