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Author Topic: Engine noise, terminal?  (Read 61117 times)

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TheBoy

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Re: Engine noise, terminal?
« Reply #15 on: 01 March 2010, 09:50:55 »

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Well, its clear you need to check and work through the basics.........
We are assuming that (petrol) injectors firing at the wrong time would not cause any real issue?
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Marks DTM Calib

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Re: Engine noise, terminal?
« Reply #16 on: 01 March 2010, 09:51:33 »

If it was down a cylinder then, it would be obvious.....what were the compression test results like?
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TheBoy

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Re: Engine noise, terminal?
« Reply #17 on: 01 March 2010, 09:54:03 »

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If it was down a cylinder then, it would be obvious.....what were the compression test results like?
First compression tests wer 10bar for no1, and 14 for others. 2nd test, 6bar for no1.  Not sure if borewash would be coming into play, he says optimistically?
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Kevin Wood

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Re: Engine noise, terminal?
« Reply #18 on: 01 March 2010, 09:55:54 »

Should add, compression test reads 12 bar on all cylinders bar no.1 which reads about 6-7. :(

OK, it was cold, the bores dry and washed with fuel after a few quick start-stop cycles, but, given all the other pots were healthy and closely matched I think that's a clear sign.

It appeared to settle at a smooth idle for the few seconds we ran it.

It is a harsher sound than a big end, thinking about it.

I fear foreign object is looking like the most likely. :'( Given the work carried out, it seems the only option other than a coincidental failure.

No evidence of damage to the plug or from what can be seen of the piston crown down the plug hole.

Kevin
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tunnie

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Re: Engine noise, terminal?
« Reply #19 on: 01 March 2010, 09:56:16 »

if there is a foreign object, would the idle not be rough?  :-/
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Kevin Wood

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Re: Engine noise, terminal?
« Reply #20 on: 01 March 2010, 09:56:59 »

Ahh, yes. 14 bar on the healthy pots.

Kevin
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Re: Engine noise, terminal?
« Reply #21 on: 01 March 2010, 09:58:00 »

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if there is a foreign object, would the idle not be rough?  :-/

You'd only lose 1 cylinder. I'd say at least 5 were firing.

Kevin
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Re: Engine noise, terminal?
« Reply #22 on: 01 March 2010, 10:00:34 »

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if there is a foreign object, would the idle not be rough?  :-/

You'd only lose 1 cylinder. I'd say at least 5 were firing.

Kevin
DO you think it was running on 5?  I thought it was probably running too well to be 1cyl down?

But then the compression test......
« Last Edit: 01 March 2010, 10:00:56 by TheBoy »
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tunnie

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Re: Engine noise, terminal?
« Reply #23 on: 01 March 2010, 10:01:02 »

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Quote
if there is a foreign object, would the idle not be rough?  :-/

You'd only lose 1 cylinder. I'd say at least 5 were firing.

Kevin

V6 idles ok on 5? When i destroyed a plug on the 2.2 that felt damn rough, but not experianced miss-fire on V6.

Can V6 be run with pot 1 HT lead / plug out? Run like poo i should imagine, but might be able to see something bouncing around in the pot?
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Re: Engine noise, terminal?
« Reply #24 on: 01 March 2010, 10:01:36 »

could only be paper towl surely?
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Re: Engine noise, terminal?
« Reply #25 on: 01 March 2010, 10:02:36 »

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could only be paper towl surely?

Would that not burn off eventually? would get soaked in fuel and go bang quite quickly?
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JamesV6CDX

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Re: Engine noise, terminal?
« Reply #26 on: 01 March 2010, 10:04:09 »

Sorry to hear this, Jaime. I know the sinking feeling - I had it when my MV6 threw a rod!

Maybe it's running on 5.5? Given the compression reading, it does seem possible something has got into no1. Presume you've taken the inlets right off and looked down into the valve stems?

My feeling is you'll be pulling that head off for a closer look.

If I can help in any way, shout  :y
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Kevin Wood

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Re: Engine noise, terminal?
« Reply #27 on: 01 March 2010, 10:04:50 »

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Quote
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if there is a foreign object, would the idle not be rough?  :-/

You'd only lose 1 cylinder. I'd say at least 5 were firing.

Kevin
DO you think it was running on 5?  I thought it was probably running too well to be 1cyl down?

But then the compression test......

Not sure  :-/ The engine seemed to be rocking a little, but the important point IMHO is that it was smooth on the cylinders that are OK (I.E. no massive air leak causing it to run lean, etc.).

I think the compression test points to the next course of action, unpalatable though it may be. :(

Kevin
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Re: Engine noise, terminal?
« Reply #28 on: 01 March 2010, 10:06:29 »

Head-Off party at Kevin's place? ::)
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Kevin Wood

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Re: Engine noise, terminal?
« Reply #29 on: 01 March 2010, 10:07:56 »

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Head-Off party at Kevin's place? ::)

Well, I think the venue is fixed, unless anyone has a low loader. ;)

Kevin
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