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Topic: Erm....it's started pinking again (Read 751 times) |
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Jonnycab
Senior Member
Former owner of 2.3 Ultima Facelift saloon
Posts: 3900
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Erm....it's started pinking again
« on: Aug 25th, 2007, 9:26pm » |
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It's been fine for 3 months, since I replaced the camshaft sensor, but it's doing it again 
Started a couple of weeks ago, only a short rattle when dipping the accelerator, just before it drops down a gear.
So it's pinking under load...but as before, it doesn't do it all the time, just occasionally
I checked the plugs today & all are fine apart from No4 plug which is obviously overheating, as it was starting to get a dark glaze on it.
I think I'd be right in thinking that this is caused by the pinking, but why just this plug & not the others ?....would there be a big carbon build up in this cylinder ? & if so, why just No4 & not the other three ?....Hmmm 
I might add that if I use BP etc 97 Ron, then there is no pinking at all. But this stuff is just too expensive to use all the time 
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pat
Full Member
Rover 75. Rover 620. Ford P100 Pickup.
Posts: 545
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Re: Erm....it's started pinking again
« Reply #1 on: Aug 26th, 2007, 3:50pm » |
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Sounds to me as though you might have an air leak on No. 4 which could weaken it and cause overheating and pinking.
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You don't have to be mad to own a Scorp - but it helps!
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Jonnycab
Senior Member
Former owner of 2.3 Ultima Facelift saloon
Posts: 3900
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Re: Erm....it's started pinking again
« Reply #2 on: Aug 26th, 2007, 4:51pm » |
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I was maybe thinking that, but where would the leak be ?
The plugs are nice & tight, & the inlet & exhaust manifolds both have new gaskets
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Alastair
Full Member
2.3 Ghia X & MGB Roadster
Posts: 129
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Re: Erm....it's started pinking again
« Reply #3 on: Aug 26th, 2007, 7:26pm » |
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Hi JC
Try this - take out No. 4 plug, take of the dark glaze with a small file, check the gap and switch it with the No.2.
Run the car for a couple of days and see if plug 2 (now in 4) has started to glaze and the rest are still OK.
Alastair
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Jonnycab
Senior Member
Former owner of 2.3 Ultima Facelift saloon
Posts: 3900
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Re: Erm....it's started pinking again
« Reply #4 on: Aug 26th, 2007, 10:02pm » |
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Alastair, great minds eh...  .......already did that yesterday 
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pat
Full Member
Rover 75. Rover 620. Ford P100 Pickup.
Posts: 545
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Re: Erm....it's started pinking again
« Reply #5 on: Aug 27th, 2007, 2:36pm » |
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Not very au fait with fuel injection systems but by the injector perhaps?
Head gasket?
Was it OK after you fitted the new gaskets and then developed again? If so, presumably you've re-checked the bolts. Again, if that is the case, could you have a warped inlet manifold? In my trade days (long ago!) a good coat of gasket cement usually did the trick but not sure whether that's still an option with more modern engines.
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