Author Topic: Pinking when setting off.  (Read 4450 times)

penfold1981

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Pinking when setting off.
« on: 23:15, Tue 18 August 2009 »
Like the title says, I'm getting slight pinking when I'm setting off, I think it just does it at low revs (so not very often then :D ) Any ideas? Just a fueling prob?

Maybe not related but I get a slight hestation when changing in to the next gear after red lining it!

Running 99 octane fuel and set idle up on gas tester, lambda was about 1 and co2 was about 3.5%

To me it's suggesting a lean mixture but just wanted to hear what anyone has to say.

Now I think about it, I don't know if I had the good fuel in when I set it up!!

Anyway... just wondered if there may be something I'm missing?

5teve L

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« Reply #1 on: 08:28, Thu 20 August 2009 »
Are you sure it's pinking, I wouldn't think it would pink just setting off as it would need to be under a little more load/heat ?
Are you sure it's not either the ex manifold gasket or the driveshaft, sometimes the driveshaft makes an odd sound, not clicky like the outer cv, mine was the inner & the needle bearings had started to drop out of one of the knuckles.
Not saying it isn't the fueling but i've never heard an engine pink that low down before.. it will hesitate alot if it's running that lean or the ign timing is out alot, maybe the vaccumm advance module in the AEI is playing up giving too much advance ?

whitneyd

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« Reply #2 on: 09:11, Thu 20 August 2009 »
Does the carb have an accelerator pump on it. Could be the diaphram.
1995 Escort Cosworth
1994 Renault Express GTT

penfold1981

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« Reply #3 on: 10:57, Thu 20 August 2009 »
thanks guys, that's a few things I can look in to. I'm wondering if it could be the timing chain also.

Problem is that it's not that loud and don't think you could pic the sound out if I put a video up.

5teve L

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« Reply #4 on: 13:21, Thu 20 August 2009 »
Timing chain has a rattle to it, if you blip the throttle or hold it at a certain revs you should hear it as a more constant noise, get your head under there & test it at different rpms to see if the noise is there from stationary or just under load..

penfold1981

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« Reply #5 on: 23:59, Sat 22 August 2009 »
I think it's making the knocking/rattling noise at low revs and in all the gears, the noise seems to stop after about 2500rpm or maybe I just don't hear it after that.

It doesn't seem to make any noise at idle either, only when accelerating.

No smoke, engine runs fine, not using any oil.

Really hope it's not main bearings or big end bearings :-(

anyone who knows what knackered main bearings sound like live near York?

Ash-Lee

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« Reply #6 on: 00:22, Sun 23 August 2009 »
Mine rattled pulling off, low revs and while coasting.

Turned out to be the bracket for the exhaust downpipe.

Knackered bottom ends have a deeper knocking sound, while it's idling you should be able to hear them rumbling away if you crouch down under the bumper or front wings.

penfold1981

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« Reply #7 on: 00:28, Sun 23 August 2009 »
I'll give it a good listen tomorrow, I'm not sure if I would describe it as a rattle or knock. It's very quiet. I will try and get a video of the noise tomorrow, it'll probably make it easier to diagnose.

penfold1981

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« Reply #8 on: 11:41, Sun 23 August 2009 »
you can hear the sound on this video if you turn the volume right up and it's slightly clearer towards the end. For some reason it picked the sound up better from inside the car which is why I haven't posted a video from under the bonnet. But it's definitely an engine noise and not a bracket etc, and it's not clutch release bearing related.

http://www.youtube.com/watch?v=SABxwLjNCE8

5teve L

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« Reply #9 on: 16:12, Sun 23 August 2009 »
All i can tell from that vid is that your steering wheel is squeeky. lol.

jayy.cfg

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« Reply #10 on: 16:38, Sun 23 August 2009 »
lol i got that impression too. bit of wd40 wud do that wheel some loving.

penfold1981

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« Reply #11 on: 16:59, Sun 23 August 2009 »
yeah it is a bit annoying!

Think I'm gona try an oil change and if it's still doing it I'll have to wait until it gets worse.

penfold1981

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« Reply #12 on: 16:00, Mon 24 August 2009 »
Just done an oil and filter change and the noise is still there so I've done another video and it's definitely worse when the engine is cold in a morning.

http://www.youtube.com/watch?v=v5j-whaSnEM

5teve L

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« Reply #13 on: 16:39, Mon 24 August 2009 »
Sounds like piston slap if thats a sort of clacking sound, really hard to hear anything really but I thought it sounded like piston slap personally. My forged bottom end sounded like that till it warmed up.
If not it will be the big ends.. Like i say hard to say..

5teve L

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« Reply #14 on: 16:40, Mon 24 August 2009 »
If it's the big ends one of my old cars used to make a more constant noise at a certain low RPM, i think if I held it around 2k it would rattle alot..