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Discussion Starter · #1 ·
Hi

I have just bought a 1999 3.0 S-Type and would just like some confirmation of the main problem.

The car starts fine but has a rough idle. When driving, if hard acceleration is used, the MIL starts flashing, reducing the throttle opening makes the light go off. The light does not flash at idle. I have checked for codes but there are none stored. I have also checked while the light is flashing but, again, no codes. I suspect that this is caused by the air leak under the manifold. Can anyone confirm?

Also, when moving, there is a sort of scraping noise coming from the nearside rear wheel. The bearing has been checked and found to be ok. Any ideas?
 

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Hi

Rough idle can be caused by the air leak at the rear of the inlet manifold.
If your engine light is on then there must be codes!
 

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Discussion Starter · #4 ·
Hi

Rough idle can be caused by the air leak at the rear of the inlet manifold.
If your engine light is on then there must be codes!
I have moved some of the pipes at the back of the manifold while the engine was running which seemed to smooth the idle out which is why I suspect the normal problem. The light only flashes for a short while but I have checked for codes while it is flashing and also with the engine off but nothing shows up.
 

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Sounds like a coil pack is starting to go , just had the same thing myself. Last weekend it eventually threw up a code on cylinder 3, of course it is one of the 3 under the manifold. Got the ( 3 under the manifold)coil packs and 6 x plugs changed car now runs and accelerates a lot smoother with an increase of about 4-5 mpg. I know I should have changed all six but I now have 5 'good' coil packs that can be changed relatively easily?
 
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