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Car Forum / Mazda / Mazda Miata / May 2007Pinging
Hello all, My 1991 Miata, just never quit pinging (rattle noise), my mechanic suggested to fill up with premium gas for a while and add Chevron Techron, I did that but pinging is still there, with the current gas price I really want to go back to regular gas, any ideas, suggessions please. Abid > Hello all, > [quoted text clipped - 5 lines] > > Abid My '96 has always pinged (panged? pung?) on 87 octane but not on 91. > <a...@att.net> wrote in message > [quoted text clipped - 11 lines] > > My '96 has always pinged (panged? pung?) on 87 octane but not on 91. Yeah, but the engine in Miata's 91 doesn't require 91, does it. >>> My 1991 Miata, just never quit pinging (rattle noise), my >>> mechanic suggested to fill up with premium gas for a while and [quoted text clipped - 5 lines] > > Yeah, but the engine in Miata's 91 doesn't require 91, does it. Yes, apparently it does. ;) Whether it's supposed to require 91 or not is another question. In my experience, as engines age they seem to require higher octane fuel to avoid pinging. I presume it's due to the buildup of deposits in the cylinders that create hot-spots somehow or to degraded performance of engine management components.  SignatureGrant Edwards grante Yow! I'm pretending that at we're all watching PHIL visi.com SILVERS instead of RICARDO MONTALBAN! > In my experience, as engines age they seem to require higher > octane fuel to avoid pinging. I presume it's due to the > buildup of deposits in the cylinders that create hot-spots > somehow or to degraded performance of engine management > components. I agree with Grant here, he's got a good point. I'm however, wondering if the OP is confusing pinging with HLA noise (a 91 miata's security blanket). He refers to it as "rattle noise". The lifter noise is unaffected by octane and the OP says he put in the hi test and it didn't help. Allot of mechanics aren't familiar with the miata's lifter clatter. The OP should try a fresh oil change (maybe a high mileage blend) and pay close attention, he may find it disappears for about 25 to 2700 miles. Consider it a 'maintenance required" warning! Later, Chris 99BBB I'd agree with Chris, and suggest that a bit (few ounces) of "Marvel Mystery Oil" (or some automatic tranny fluid) be added to the oil. This did wonders for the tiny lifters in our old Mazda MPV 4cyl. with 213,000 on it. > > In my experience, as engines age they seem to require higher > > octane fuel to avoid pinging. I presume it's due to the [quoted text clipped - 15 lines] > Chris > 99BBB > This did wonders for the tiny lifters in our old Mazda MPV 4cyl. with > 213,000 on it. there was a 4 cyl avail? I had the V6 once upon a time, wasn't aware they offered a 4. Chris 99BBB It was actually the better of the two engines. Seems that it had the Japco/ auto tranny, instead of the electronic one used with the 6cyl. The tranny was (so I'm told) originally intended for taxicabs. The 4 cyl was a very good long lived engine, without many of the problems associated with the v6 engines. The 4cyl was also available with a standard tranny, although it was not very popular, and the length of the shift lever was something to behold. > > This did wonders for the tiny lifters in our old Mazda MPV 4cyl. with > > 213,000 on it. [quoted text clipped - 4 lines] > Chris > 99BBB > > In my experience, as engines age they seem to require higher > > octane fuel to avoid pinging. I presume it's due to the [quoted text clipped - 17 lines] > Chris > 99BBB Thanks Chris, I am very well be confuse, I don't even know about HLA, I will do fresh oil change and fill up with high octane right away. >>> In my experience, as engines age they seem to require higher >>> octane fuel to avoid pinging. I presume it's due to the [quoted text clipped - 17 lines] > Thanks Chris, I am very well be confuse, I don't even know about HLA, > I will do fresh oil change and fill up with high octane right away. HLA noise is unmistakable - very loud even at idle, and comes from the very top of the engine. Pinging (or pinking as we say over here) typically shows up only when the engine is put under load - such as driving up a steep hill, or under harsh acceleration. If you think it's the latter, you should have the timing checked. A former owner may have advanced it to 18 degrees BTDC by mistake - it happens, as the timing marks are easily confused. > a...@att.net wrote: > >>> In my experience, as engines age they seem to require higher [quoted text clipped - 29 lines] > > - Show quoted text - Now I am sure it is pinging not HLA, I will have the timing checked. > Now I am sure it is pinging not HLA, I will have the timing checked. Well, sounds are tough in text ;-) but, if the high octane didn't help, it makes it somewhat less likely it's the timing issue. Not saying it can't be, just less likely. By the way, 10 BTDC is spec but I strongly recommend 14 BTDC for extra seat-of-the-pants low end torque. Let us know the result! Chris 99BBB >> Now I am sure it is pinging not HLA, I will have the timing checked. > > Well, sounds are tough in text ;-) but, if the high octane > didn't help, it makes it somewhat less likely it's the timing > issue. If the timing is really whacked, then it might still ping on 91 in warm weather. But, changing from 87 to 91 should have reduced it. OTOH, you'd think he'd have lost enough compression by now that it wouldn't be a big problem. :) If it's louder at idle/cold, then it's lifters. If it's lounder when it's hot and you're trying to accellerate in high gear, it's pinging. If it's the latter and 91 octane doesn't help much, he might want to try a tank of 93 or 94 if he can find some. He also might want to check the plug wires to make sure their not worn out, loose, or mis-connected. Bad wires will make an engine sound funny (though it doesn't usally sound like real "pinging"). SignatureGrant Edwards grante Yow! Hmmm... a CRIPPLED at ACCOUNTANT with a FALAFEL visi.com sandwich is HIT by a TROLLEY-CAR... > If it's louder at idle/cold, then it's lifters. If it's > lounder when it's hot and you're trying to accellerate in high > gear, it's pinging. Let's make this simple. Your engine won't ping when your foot's off the throttle. HLA clatter doesn't care what the throttle is doing. >> If it's louder at idle/cold, then it's lifters. If it's >> lounder when it's hot and you're trying to accellerate in high >> gear, it's pinging. > > Let's make this simple. Your engine won't ping when your foot's off the > throttle. HLA clatter doesn't care what the throttle is doing. My HLA clatter seems to come and go as it it pleases, though it tends to be worse after 2500-3000 miles and worse when the engine is hot (the opposite of what Grant said). > My HLA clatter seems to come and go as it it pleases, though it tends to > be worse after 2500-3000 miles and worse when the engine is hot (the > opposite of what Grant said). I remember it being the way you describe also. The thicker / cold oil lessened the noise, the hotter / thinner / older oil, accentuated the noise. Chris 99BBB > Let's make this simple. Your engine won't ping when your foot's off the > throttle. HLA clatter doesn't care what the throttle is doing. Thank you, the KIS principal! Chris 99BBB > Thanks Chris, I am very well be confuse, I don't even know about HLA, > I will do fresh oil change and fill up with high octane right away. [quoted text clipped - 5 lines] >lifters. The miata's tend to get "tired" and get a bit noisy. It's not as >scary as it sounds, they'll go on and on and on. Good luck, Chris 99BBB >> <a...@att.net> wrote in message >> [quoted text clipped - 13 lines] > > Yeah, but the engine in Miata's 91 doesn't require 91, does it. Neither does the '96. |
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