DavidM
|
| posted on 7/10/07 at 06:14 PM |
|
|
Mondeo Misfire
Hi,
I'm having a problem with my Mondeo. It's a 2 litre and under certain circumstances it misfires.
It ticks over fine
If I increase the revs gradually from tickover it's fine.
If I blip the throttle from tickover it misfires quite badly.
When driving this means I have to get the revs quite high to pull away and then accelerate very slowly, but when I reach whatever speed I want to be
driving at it's fine.
The plugs are fine, the coil pack measures 0.6 ohms across both terminals (book says 0.5 +/- 0.05, don't know if that is significant), and it
does it with or without the airbox/airfilter installed. It's not got any water /oil problems so I've ruled out head gasket.
Any ideas chaps, it's driving me nuts.
David
|
|
|
|
|
andybod
|
| posted on 7/10/07 at 06:17 PM |
|
|
have you checked/changed the ht leads how old are the plugs could be one breaking down and generally check round for air leaks
|
|
|
Mansfield
|
| posted on 7/10/07 at 06:23 PM |
|
|
2nd for HT leads. Have a look along the length of each one. Sometimes you can see where they are tracking to something metallic..
Edit - 2nd for have a look at the plugs as well.
[Edited on 7/10/07 by Mansfield]
|
|
|
stevec
|
| posted on 7/10/07 at 06:25 PM |
|
|
Check plugleads with meter should ge about 10K ohms a foot if I remember right.
Steve.
|
|
|
britishtrident
|
| posted on 7/10/07 at 06:26 PM |
|
|
Yes could be the plugs flashing over --- new leads and plugs.
Standard plug gap is 1.3 mm ! such a wide gap puts the HT components under a lot of stress.
If the plugs leads start to flash over at the plug lead boot they carbonise the boot and make the surface of the porecelain conductive.
I have started use narrower plug gaps -- try 1mm 0r even 0.8mm
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
|
|
|
stuart_g
|
| posted on 7/10/07 at 08:36 PM |
|
|
What year mondeo are we talking about here. my inlaws have a 51 plate that has an intermitant misfire, not surprising the stealers can't find
the fault. loads of bits changed but still happening. any suggestions?
|
|
|
UncleFista
|
| posted on 7/10/07 at 08:52 PM |
|
|
Check the vacuum hose under the coil pack, there's a "T" piece that splits.
A couple of quid from Ford.
Oh, and British Trident, you're not the only one to use 1mm plug gaps now, Ford changed their recommendation once they realised how quickly the
plug leads were breaking down  Only replace Mondeo plug leads with top quality ones, preferably from Ford (not cheap though). Cheapo ones are a
false economy.
[Edited on 7/10/07 by UncleFista]
Tony Bond / UncleFista
Love is like a snowmobile, speeding across the frozen tundra.
Which suddenly flips, pinning you underneath.
At night the ice-weasels come...
|
|
|
rusty nuts
|
| posted on 8/10/07 at 05:19 PM |
|
|
As well as the plugs and leads try a bottle of injector cleaner, have found it helps .
|
|
|
DavidM
|
| posted on 14/10/07 at 06:40 PM |
|
|
Thanks fellas, changed plugs, although they looked alright, and plug leads and now it runs like a dream.
David
|
|
|
.jpg)
