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Topic: 12v Starting Problems (Read 641 times) |
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RebGershon
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Happier Newbie
Posts: 42
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12v Starting Problems
« on: Feb 18th, 2009, 10:12pm » |
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For sometime now I've been having intermittent cold start problems with my 12v Ultima. Always seems to be during and immediately after damp weather conditions. Seemed to start last summer during all the heavy rains. Until then always started first time quickly settling to idle at around 1000 revs.
Now engine will only fire after few turns of starter with accelerator depressed afterwhich needs to maintain around 2000 revs for about 1-2 minutes to stop engine dying. Engine then idles at around 500 revs with some hunting-it almost sounds as though there is a hollowness in the engine. Exhaust gas smells very rich in unburnt fuel. If left to idle like this after about 10-15 minutes the fault suddenly clears and idle speed goes upto around 1000 revs and engine then sound normal. Its as though there's been a drying out due to the warm up.
Checked leads, coil and distributor connections of HT leads, fuse boxes and drains-all clear.
Car is parked facing downwards on an inclined driveway overnight.
Maybe I need to change the plugs, leads dizzy cap, rotor arm? Or could there be water getting into the cylinders from a leaking gasket?
Any ideas welcome.
TIA, Geoff. 
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gozz
Senior Member
Been around awhile
Posts: 3475
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Re: 12v Starting Problems
« Reply #1 on: Feb 18th, 2009, 10:31pm » |
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Geoff.
As has been recounted several times,the 12valve has three signal wires bound into a copper shielded coaxial type setup,these wires are contained in the loom along the offside rocker box,and go from the distributor to the PCM via the big terminal block on the offside inner wing.This three wire cable breaks down and in damp conditions sends false information to the PCM,thus wrong sparks,wrong fuelling etc.If you dismantle the loom it may well be found that this is the problem,I have discovered that the entire loom,particularly the triple cable has disintegrated all the way round to about half the way across the front of the radiator.If this proves to be the case you can painstakingly strip and retape the loom,and use a piece of three core bound with copper to replace the signal wires.
GOZZ.
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RebGershon
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Happier Newbie
Posts: 42
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Re: 12v Starting Problems
« Reply #2 on: Feb 18th, 2009, 10:41pm » |
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Thanks for that info Gozz.
Do you have any pictures that would help me identify the loom and in particular direction of travel of this loom.
Thanks again,
Geoff.
p.s. would any pics from the Haynes Granada manual assist me?
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python9
Full Member
1997 24v ghia saloon
Posts: 241
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Re: 12v Starting Problems
« Reply #3 on: Feb 19th, 2009, 9:09pm » |
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could be the idle control speed sensor or valve this also gives idling problems and hunting when driven revs go up and down
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RebGershon
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Posts: 42
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Re: 12v Starting Problems
« Reply #4 on: Feb 19th, 2009, 9:41pm » |
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Hi again Goz,
I managed to find a schematic picture of the engine loom on the site at http://www.fordscorpio.co.uk/12vlooms.htm.
The wires for the loom seem to enclosed in plastic, outer umbilical tube that has an opening where the lambda sensor wires enter it near to the front of the engine. Is this the correct loom?
According to the diagram there is a connector-C2505 which appears to go to the bottom of the distributor. Is this where the co-ax type cabling comes from?
TIA,
Geoff.
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gozz
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Posts: 3475
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Re: 12v Starting Problems
« Reply #5 on: Feb 19th, 2009, 11:23pm » |
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Geoff.
That's right,you will need to remove the plastic cover (throw it away) and examine the state of the insulation on the wires,particularly the three core co-ax type cable.
A job requiring diligence and patience 
GOZZ.
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Simmo
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Posts: 5508
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Re: 12v Starting Problems
« Reply #6 on: Feb 20th, 2009, 8:46am » |
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THIS firm may be helpful if you need materials. Several of us have used them and they are v good. 
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