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16th November 2018, 15:49 | #1 |
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Engine juddering
I hope someone can help!
I am getting a juddering from the engine, you can feel it almost slightly misfiring at idle and you can see the needle slightly moving up and down. Also when I’m driving it judders at times for example when pulling away and even just cruising at the same speed. It doesn’t do it all the time and is intermittent, sometimes all gears sometimes just one. Basically when I push the accelerator down (even really gently). It’s really doing my head in not knowing what it is - it almost feels like fuel starvation? I thought it might be the lower engine mount but that was changed today and it’s still the same! Argh!
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16th November 2018, 16:44 | #2 |
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Check your idle control valve ,broken vacuum lines and plugs.mine made a difference when i serviced my idle valve...
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16th November 2018, 18:34 | #3 |
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Thanks for the reply!
Would you be able to give a bit more detail as I have no idea what you mean! Sorry for being dim. Thanks Kev
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[SIGPIC][/SIGPIC] Done: New leather & walnut steering wheel, headlight restore, new badges to rear & engine, walnut facia trims, full size spare wheel, timing belts, Plenum spy hole, DD head unit. • This vehicle was the 67,855th 75 to run off the production line, out of 112,381 • This vehicle was the 2,457th 75 2.5 V6 Connoisseur SE to be made out of 3,671 |
16th November 2018, 18:55 | #4 |
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It will be on the air plenum box , near the throttle. It allows a small amount of air to bypass the throttle valve to keep the engine running at idle. Surprised if it would cause those symptoms. Sounds more like failing injector, spark plug(s) or plug lead(s). Start it up in the dark, open the bonnet, and rev it from under the bonnet. See if you can see electrical sparks jumping about. It may tend to be worse in damp, dewy weather.
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16th November 2018, 18:59 | #5 |
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PS Sorry. Failing spark due to break down of plug nose insulation would not show under the bonnet, but the plug spark is so weak, the fuel injection drowns it, usually at lower revs with foot down, so the fuel does not ignite properly.
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16th November 2018, 19:41 | #6 |
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Crankshaft pulley beginning to fail ?????
Will judder in all gears and revs. |
17th November 2018, 07:26 | #7 |
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Not on a KV6 Jon. That delight is the preserve of the diesel!
Kev, does your car have a manual gearbox? Another real possibility is 'fuel filter syndrome'. Do you have the orange clip fitted? Simon
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17th November 2018, 10:06 | #8 |
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Thanks for the replies chaps, it is a manual Simon - what orange clip and where is it lol?
Thanks Kev
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[SIGPIC][/SIGPIC] Done: New leather & walnut steering wheel, headlight restore, new badges to rear & engine, walnut facia trims, full size spare wheel, timing belts, Plenum spy hole, DD head unit. • This vehicle was the 67,855th 75 to run off the production line, out of 112,381 • This vehicle was the 2,457th 75 2.5 V6 Connoisseur SE to be made out of 3,671 |
17th November 2018, 13:28 | #9 | |
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It can be fitted to the fuel filter to prevent the two halves of the casing loosening in service. When this happens fuel pressure is reduced and the engine falters or stops. The filter is located under the rear seat cushion on the passenger side. For further reading, search for 'FFS' or 'Fuel filter syndrome'.
Quote:
Simon
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17th November 2018, 16:47 | #10 |
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I too think it is drive train related.
The car still starts great so I doubt the clip is to blame. Seems to happen under load if you labour the engine ( high gear, low speed) So I agree with SD1too........... could be fly wheel |
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