Cold Tappety......

[one-lady-owner 1]

I've got a very odd and very intermittent problem with my 75k 1.9 8v engine, every so often when the engine is cold, and usually more when it's cold ambient temp as well, I start the car and it sounds a little tappety and runs a little lumpy, it's had a recent oil and filter change (OE filter, and 0w-40w fully synthetic) doesn't lose or use a drop, the oil pressure runs up as usual when it starts it just feels a little lumpy, but the minute I put it into gear and put load onto the engine (against the handbrake) the engine settles down, the noise goes away and it runs fine, any ideas??

 

It's a ph2 motronic, cat model, completely standard, and very very very occasionally and never for very long, the 'K' engine management light come on (again usually when it's cold outside!?!?!?!?)

Edited November 2, 2009 by one-lady-owner

[kyepan 291]

I would have said change the oil. And that's still probably. My advice. 0w 40 if. I understand oils correctly will be less viscous than 10w 40 or less still than 15w 40 when cold. What is the recommended weight and synthetic grade of oil for your engine? I may be the wrongway round on the viscosity but either way on the cold temps the hydraulic tappets are not getting enough oil to close the clearance to a quiet level

[richsmells 2]

Tappets are solid. I'd stick to 10 w40 semi synth personally.

[Jrod 7]

It doesnt have hydraulic tappets.

[kyepan 291]

That willvteach me for only ever having an mi

 

Written on my touch phone hence bad typos

[Galifrey 1]

Are you sure its tappets?

 

Could be exhaust manifold or HT/coil arcing to earth both can make a ticking sound.

 

I doubt tappets would light the engine management light, exhaust leak could tho! (Lambda sensor)

[one-lady-owner 1]

I only say tappets because it's that type of noise, if it was exhaust i don't see how putting the engine under load would stop it.....

 

I'll check the coil and have a good look at the exhaust and see what I find!

Edited November 3, 2009 by one-lady-owner

[jackherer 543]

A small exhaust leak might be losing 50% of the gas flow at idle but at higher load that same small leak might only represent 5-10% of the total gas flow so the lambda reading will become much more accurate.

[one-lady-owner 1]

But surely if that were the case it would return to the noise when it returned to idle, but it doesn't, it then sorts itself out, goes quiet and runs sweet.

 

I'll check the exhaust anyway, just trying to think my way round what it could be!

[jackherer 543]

I would say you most likely have a faulty AFM actually, or possibly lambda sensor, but I don't think they are used until the engine is warm. As its temp related it could also be the ECU temp sensor but load is unlikely to affect that so its back to the AFM.

[DamirGTI 342]

... alternator bearing perhaps sometimes it rattles on a first start up and then afterwards it shuts down ..

 

Start up the engine and try poking several places with long flat screwdriver (or stethoscope if you have it..) in order to pin point the area from where this sound comes .. (put your ear on a screwdriver handle and slide it across the engine and you'll be able to here where it rattles inside the engine ..)

 

Damir

[Galifrey 1]

... alternator bearing perhaps sometimes it rattles on a first start up and then afterwards it shuts down ..

 

Start up the engine and try poking several places with long flat screwdriver (or stethoscope if you have it..) in order to pin point the area from where this sound comes .. (put your ear on a screwdriver handle and slide it across the engine and you'll be able to here where it rattles inside the engine ..)

 

Damir

 

A piece of thin tube does the job like that nicely, acts as a stethoscope, I use aquarium air line pipe

[paulsupervts84 0]

it could be wrong oil filter as i know this happen to a few 205 there been given the wrong oil filter and at start its not getting a neuf oil flow around the engine

[Baz 421]

it could be wrong oil filter as i know this happen to a few 205 there been given the wrong oil filter and at start its not getting a neuf oil flow around the engine

 

Edited November 18, 2009 by Baz

[one-lady-owner 1]

Baz, I have to say I'm loving the pictures tonight!!

[Galifrey 1]

Baz, I have to say I'm loving the pictures tonight!!

 

Quoted for truth.

 

[GLPoomobile 958]

I think Baz has just completed a 1 day training course in forum put downs It must have come with a starter pack of free GIFS

[Baz 421]

I think Baz has just completed a 1 day training course in forum put downs It must have come with a starter pack of free GIFS

 

Yup, you should know, you taught my tutor!!