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Stock 2005 JCW engine pinging high rpm

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Stock 2005 JCW engine pinging high rpm

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  #1  
Old 11-05-2018, 11:38 AM
aupshon
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Stock 2005 JCW engine pinging high rpm

Hi All,

I recently purchased a beautiful one owner full service history 2005 JCW, I have been thoroughly enjoying the car however an inevitable issue has come up.

A bit of background:

The car was low on power, seem to really die off at high rpm and there was pinging now and then. I had codes read and my post cat O2 sensor was stuck lean. Apparently this was due to the decat (the car was bought like this). So the car was taken in today and software was written to fool the post cat O2 sensor.

The car now feels a lot better, power delivery is much more instant and theres more torque. However there is now serious pinging at higher rpm I am petrified of driving the car. I have ordered an OBD reader so when that arrives i will do some live data logging but so far. At 2000rpm (or lower) I can put my foot down flat and there is no pinging, at about 3400/3500 rpm the pinging starts. I can lightly rev the car out with minimal load and no pinging. What I have noticed is with gradual acceleration (before pinging occurs)power delivery is not smooth, the car subtly judders.

Where should I start and what could the cause of this be? Timing chain/tensioner? Would a bad harmonic balancer cause this?

Direction or those with similar experiences, help is greatly appreciated.
 
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Old 11-05-2018, 12:20 PM
MVPeters
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I hope you're using the highest octane fuel you can find.
Although my '02 doesn't ping, I can tell the difference between 93 & the odd occasion I have to use 89 octane.
(I suppose you could try av-gas, but it's $10 a gallon around here!).
 
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Old 11-05-2018, 12:23 PM
aupshon
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We only have 95 octane here so I can rule that out i think
 
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Old 11-05-2018, 12:38 PM
MVPeters
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If you're in the UK the ratings are a bit different.
UK95 = US91 +/- which we call a mid-grade. Can you find anything higher? Shell V-power has a good reputation, though I've never tried it.
I'll just comment that full throttle at low (2,000) rpm is liable to encourage pinging. Maybe you could wind it up a bit!
 
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Old 11-05-2018, 12:40 PM
aupshon
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I'm in Cape Town, South Africa. I only tried at low rpm as this should generally be where pinging occurs if timing is out. At least this was the case with my 91 MR2 but i usually don't do that haha
 
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Old 11-05-2018, 06:21 PM
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I never shift below 3000. High RPM won’t hurt an engine as much as lugging it at low RPM.
 
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Old 11-07-2018, 02:23 AM
aupshon
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I agree, I have only been doing this to test where the pinging occurs. I pulled OBD codes and have P2270, would this be a cause of pinging? I was under the impression the O2 sensor only comes into play during closed loop.
 
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Old 11-07-2018, 04:53 AM
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P2270 means that too much air is being sensed, which is a lean condition. Pinging can be caused by a lean condition. I would start looking for causes of a lean condition. Advanced Timing is a cause of pinging. Not enough fuel obviously also. Carbon deposits, wrong spark plugs and overheating are also causes of pinging.
 
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Old 11-08-2018, 11:53 AM
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Did you discover the problem yet?
 
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Old 11-08-2018, 01:27 PM
drea-min
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Originally Posted by aupshon View Post
We only have 95 octane here so I can rule that out i think
switch and buy gas from different gas company, gas are produce differently the way their feed stock are came from and added blendings are differently, believe me they are. Switch to different brand gas stations.
 
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Old 11-08-2018, 02:12 PM
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I don’t think the gas is causing the pinging. I’ve run 89 octane (I know I shouldn’t) without even the slightest hint of pinging.
 
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Old 11-08-2018, 07:38 PM
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Originally Posted by Tgriffithjr View Post
P2270 means that too much air is being sensed, which is a lean condition. Pinging can be caused by a lean condition. I would start looking for causes of a lean condition. Advanced Timing is a cause of pinging. Not enough fuel obviously also. Carbon deposits, wrong spark plugs and overheating are also causes of pinging.
What he said. Have you "read" the plugs yet? Lean? Proper heat range? Can you try to find an air leak with a judicious squirt or two of starting ether in the engine compartment? A rise in RPM means an air leak of unmetered air.
 
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