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  #1  
Old 06-05-2001, 01:28 AM
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I don't know if chevron has been selling low grade gas or if something is out of adjustment. since it got hot (above nineties) it's been bad.
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  #2  
Old 06-05-2001, 04:18 PM
Southern_Son
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I would be inclined to think something is out of adjustment.
I'll give it a go if you can describe the circumstances.
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  #3  
Old 06-05-2001, 04:21 PM
G-Benz's Avatar
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How about a little more information?

As far as the knocking and pinging:

Which car is doing this? (Between the two on your signature, carbureted vs fuel-injected?)

Does it happen at all engine speeds? Load or under load?

Cold or warm engine?

Have you filled up again with a different brand or grade and still get the same results?

Any recent tune-up work done?

Does it overheat?

Answers to these questions will help pinpoint the cause...
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  #4  
Old 06-05-2001, 04:23 PM
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have timing checked ,then try antother brand of gas if that dosn't cure it......
William Rogers......
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  #5  
Old 06-05-2001, 04:49 PM
Southern_Son
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Ooops, sorry guys. I forgot which forum I was in...I am not a mechanic ( I didn't even stay in a Holiday Inn Express last night ) I'm outa here.........
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  #6  
Old 06-05-2001, 08:13 PM
Clauser1
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Are you using Premium grade?
If its your 2.6 You should do so.
Mine is 2.6 too,and one time
I tried 89 octane,underload
the engine sound like shooting
marbles.It pings like a son of*##!*.
Clauser1
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  #7  
Old 06-06-2001, 01:06 AM
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sorry all,
it seems as some info got cut off when I originally posted. it's the 2.6 190e that is knocking. it does it under load and is worse when it's warmed up. it seems worst when the temp outside is 90+. I always use 91 octane chevron. I tried other brands and it was often hard to start even though it was premium octane. My plugs get a weird build up on them if that is any indication..like a black puffy ash. not the standard oily carbon from being too rich. I installed cooler plugs (bosch supers) and it helped a little. both the 190 and the 250 are fuel injected and have not had any work done recently save an a/c compressor. thanks for all the response everyone.
darren
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German autos!!!
'67 250se coupe
'89 190e 2.6 (gone but I kinda miss it)
'96 c220
'07 BMW x3
'59 0319 diesel Omnibus...the "O"
Italian bikes!!!
'64 Lambretta Special 185 hot rod scooter
'66 Lambretta SX200
'59 Lambretta 250 race bike
'70 Lambretta GP200
'77 860gt ducati
'66 ducati monza
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  #8  
Old 06-06-2001, 09:51 AM
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Posts: 82
Pinging results from a complex relationship between octane, spark timing, engine temperature, ambient temperature, engine load and speed, engine compression, and even ambient humidity. Small changes in any of these can make a significant difference. A well tuned car should ping lightly on a long uphill gradient on a warm day. The "sound of economy" as some people call it. The two easiest variables to control are octane and timing. Sometimes if you retard your timing just one or two degrees from its current setting it will do the trick. Just don't overdo it. Some real old cars had a way to make adjustments to ignition timing from inside the car while underway so you could "dial it in" as you went. Water injection is also an effective way to reduce octane requirements. The Germans used it extensively on their fighter planes during WWII since they didn't have access to high quality gasoline like the Allies.
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  #9  
Old 06-06-2001, 01:38 PM
Robert Boyer
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ping

Chevron? My own experience has been that Chevron works absolutely the best on my 420 SEL. Not imagined. Evrytime I use Mobil premium (its on the corner by my office), I get angry with myself later. The car just doesn't seem the same without the Chevron.

Techron does make a difference - and that's what's in Chevron.

The gas is not your problem.
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  #10  
Old 06-08-2001, 09:14 AM
LarryBible
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johngray,

I hate to take issue with your advice, because I can see how what you say could work if you drive the car correctly. If the timing is such that the engine pings under the circumstances you describe AND you back off the gas enough when climbing that hill to prevent pinging, I might go along with it.

The reason I take issue is that ideally, you should NEVER here your engine ping. Pinging is preignition. Under normal combustion, the fuel/air mixture burns SLOWLY. Preignition is the fuel/air mixture igniting and burning virtually INSTANTLY in one concentrated location on the top of the piston. This puts a strong impact on one small point on the piston top. It is as if you swung a very large pick shaped hammer as hard as you could against the piston top. I have seen preignition put a hole through the top of a piston.

For this reason, it is important for your engine NOT to experience preignition at all.

Have a great day,
Larry
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  #11  
Old 06-09-2001, 12:51 AM
dlswnfrd
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You Heard It From The Horses ----!

Brother of The Benz, Opossum albuquerque,nm
Those replies telling you to get it fixed are facts.
FIX IT!
Off of the subject, it's nice to hear from a fellow Duke Cityite.
I was born in Chama and raised in Albuquerque.
In 1943 I went to Coronado Grammer School on South Fourth St. and then to Washington Jr. High at Tenth and Park. On to Highland High in the highths.
I left The Duke City to go to College in Flint, Mich on a scholarship to The General Motors Institute.
I returned home to work for the AEC, before returning to G.M from which I retired.
I could go on, but this isn't the place.
Happy Trails Beep Beep from The Spiderman in Houston!!!
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  #12  
Old 06-09-2001, 08:40 PM
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Location: oregon
Posts: 2,013
Most people don't relize that the lower the octane the gasoline the more volitile it is ,high octane gas has a retarder in it hence it can be compressed more (higher compression ratio engine) thus giving more power on the down thrust of the piston and with a longer burn.So when you use the more volitile fuel(low octane) in an engine with high compression it flames guicker causing what you hear as pinging, and can do real damage to pistons over the long run.So the proper way to combat the problem is to use the right octane macthed with the factory spec timeing. I reilize that the newer cars do some weird timeing tricks with the computer ,but that is beyond this old codger ...
William Rogers........
74 240D, 81 300 SD. 81 hot rod 2wd Blazer (454) 2 year project...........
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  #13  
Old 06-10-2001, 01:57 PM
rmanies
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You should be using premium gas / 91+octane. New Mexico elevation is typically 5,000 ft +. Many gas companies lower octane levels as elevation rises. Chevron may have lower octane ratings for their premium. Suggest looking at pump to see what rating you are purchasing. Car needs 91+ regardless of altitude. If Chevron has reduced their octane rating, you may want to check other brands in your area. You have some gas companies in your area that used to sell 100+ octane gas.
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  #14  
Old 06-12-2001, 03:07 PM
Bigshot
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Your timing might be good on the light but your advance might not be doing it's job. Try a higher octane gas like Sunoco 94 and see if it helps. If so you have some timing issue. The more miles a car gets on it, the more octane it needs.
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  #15  
Old 06-12-2001, 03:18 PM
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Pinging is Bad!

Just had to reinforce this. Knock sensors were developed primarily to identify when a car begins to preignite. Can cause Mucho damage if left unchecked. And it's definitely not the sound of economy, because it's real expensive to replace a burned piston.

Just my 2% of a buck

[Edited by Michael on 06-12-2001 at 06:34 PM]
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