"Pinging" Colorado

Submitted: Thursday, Feb 25, 2010 at 14:13

ThreadID: 76320 Views:2448 Replies:6 FollowUps:6

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Croc nsw

G'Day,

Getting a "pinging" noise like you used to get if you put unleaded into a super engine. Not a lot, just a bit, mainly under load, going up a hill in 4th or 5th gear.
Don't think Im letting the rev's get too low. It's an 09 model running on 91 unleaded.
Has anyone out there got any ideas??

Thanks

Dave

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Reply By: Member - William B (The Shire) - Thursday, Feb 25, 2010 at 15:22

Thursday, Feb 25, 2010 at 15:22

Hi Dave,
The engine management systems on cars these days are pretty sophisticated,
I would have though that the computer would pick up pinging through the knock sensor and adjust accordingly.
Maybe a loss of performance.
Have you checked your fluids, a hotter than normal motor can also cause pinging.
What is the manufacturers fuel recommendation.
Is it E10 your using ?
Will

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AnswerID: 405956

Follow Up By: Croc nsw - Thursday, Feb 25, 2010 at 17:04

Thursday, Feb 25, 2010 at 17:04

Will

Engine is running at normal temp, I agree about the engine management.
Recommended fuel is min 91 oct unleaded, no Im not using E10, not keen on it. Next fill I might try premium.
I could be letting the rev's get a little low under load, as this is when it seems to happen.
Thanks for your ideas/comments.

Dave

FollowupID: 675647

Follow Up By: DIO - Thursday, Feb 25, 2010 at 18:16

Thursday, Feb 25, 2010 at 18:16

One of the kindest things you can do for a petrol engine designed to run on UL is to use Premium UL. Because of the absence of certain additives (haven't got a clue what they are called) it will burn cleaner, keep your fuel system a lot cleaner and in my experience the engine oil stays heaps cleaner between changes (change every 5,000 km). Some people also claim to get improved fuel economy and performance. that hasn't been my experience. I use a couple of super strong 'rare earth' magnets wrapped around the fuel line from the tank. Sure makes me feel like I use a lot less fuel !!

FollowupID: 675662

Reply By: Ianw - Thursday, Feb 25, 2010 at 19:30

Thursday, Feb 25, 2010 at 19:30

Timing slightly too far advanced will cause "pinking", particularly when you accelerate

Ian

AnswerID: 405997

Reply By: Member - Barry (NT) - Thursday, Feb 25, 2010 at 21:20

Thursday, Feb 25, 2010 at 21:20

Dave what revs does the pinging start at and if you lift your foot slightly off accelerator does it quiten down a bit???

AnswerID: 406027

Follow Up By: Croc nsw - Tuesday, Mar 02, 2010 at 07:30

Tuesday, Mar 02, 2010 at 07:30

Barry, sorry this is late, been away at work and got back last night.

Pinging starts at around 1800-2000 revs, and yes if I lift my foot off it does go away.
Dave

FollowupID: 676605

Reply By: Member - Graham H (QLD) - Thursday, Feb 25, 2010 at 22:17

Thursday, Feb 25, 2010 at 22:17

Probaly be a good idea to change down sooner

Going uphill in 5th probably doesnt do it a lot of good.

AnswerID: 406051

Follow Up By: Croc nsw - Tuesday, Mar 02, 2010 at 07:32

Tuesday, Mar 02, 2010 at 07:32

Yea, I was thinking that as well. I was taking it easy, trying to see what sort of economy I could acheive, maybe I need to go a bit harder.

FollowupID: 676606

Reply By: Tim - Thursday, Feb 25, 2010 at 22:59

Thursday, Feb 25, 2010 at 22:59

Run a slightly thicker oil. It has something to do with the valves. I used to have the same issue in another 4x4.
Tim

AnswerID: 406063

Follow Up By: Member - Barry (NT) - Thursday, Feb 25, 2010 at 23:02

Thursday, Feb 25, 2010 at 23:02

Tim this is not the way to solve the problem. It may help in the short term to disguise the problem but the extra load on bearings will not change.

Need to solve the problem IMHO

FollowupID: 675748

Reply By: gav99x - Friday, Feb 26, 2010 at 09:28

Friday, Feb 26, 2010 at 09:28

I notice this in my Jackaroo also (3.5L V6), up a hill or under load, just over 2200rpm give or take.

My mechanic recommended putting premium in every 3rd tank or so, I've been doing this and noticed that when running on premium I don't notice the pinging.

Worth a try.

AnswerID: 406110