philip@qubix.UUCP (Philip Wang) (12/12/83)
Thank you for all of you who gave me your suggestion/experience
regarding the question of SLICK 50 which I asked in early November.
I summarized them. But, it looks no benefits been detected by
most of the people who has used it. Only one has positive
response which includes better gas mileage, more power and less
maintenance. Luckly, no response said any negative result.
It seems that the worst result you could get by using SLICK 50
is wasting money. ( Be care for!! That is just my guess.)
At the same time, I like to ask another question about my Civic
since I saw some people talking some Honda's problems. I have
an '82, model 1300FE. It has ~24k miles on it now. Since it was
only ~10k miles, I noticed that it started pinging under only
moderate acceleration. The timing is OK. I just changed spark
plugs. I also try super unleaded gas, and use lower gear to run
engine in higher rpm. But nothing helps. I wonder if the vacuum
advance is too much under moderate acceleration. I like to try
reducing it, but don't know how. I appreciate if anyone has any
idea to solve this problem. Thanks in advance.
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decwrl!qubix!philip@Berkeley.ARPA
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Philip Wang @ QUBIX Graphic Systems, Inc., Saratoga, CA.
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decwrl!qubix!philip@Berkeley.ARPAtgg@hou5e.UUCP (12/13/83)
>... I noticed that it started pinging under only >moderate acceleration. The timing is OK. I just changed spark >plugs. I also try super unleaded gas, and use lower gear to run >engine in higher rpm. But nothing helps. I wonder if the vacuum >advance is too much under moderate acceleration. I like to try >reducing it, but don't know how. I appreciate if anyone has any >idea to solve this problem. Thanks in advance. On several cars I have corrected obnoxious pinging that has no other obvious cause by repairing/modifying the EGR system. Recirculated exhaust gas tends to lower combustion temperatures by being an inert displacement gas and as a byproduct also reduces knocking (and power and mileage, etc.). A lack of EGR (via stuck valve, faulty logic or deliberate modification) on newer cars tends to produce knocking because the cars are tuned within a gnat's eyelash of knocking to begin with to produce the best economy/power possible. Hondas seem to be particularly prone to partial or full EGR failure. An old civic (~'79-'80) and a new accord ('83) both had a stuck EGR valve and pinged like crazy. Unstuck valve - pinging stopped. Hondas are really wild in the emissions dept. - two stage EGR valves, a sensor that tells the logic if the car is over 15mph (emissions are stated in grams/mile, after all), three stage carbs., 3 (or more) valves/cyl. and >20 vacuum lines under the hood! Good Luck - Tom Gulvin AT&T ISL Holmdel, NJ
wookie@alice.UUCP (12/14/83)
Pinging Honda: I have read that the Hondas have some problems with the Exhaust Gas Recirculation system (EGR) as they have a rather complex operation. The basic idea of the EGR is to reduce combustion temperatures to reduce NOX production. Should the EGR valve be disconnected or stuck closed the combustion temperatures will rise thus aggravating the tendency toward knocking. Give a check to the EGR system before you tamper witht the ignition timing and advance curves. Another source may be the simple buildup of carbon in the cylinders allowing hot spots to exist. I would bet on the EGR though. Keith Bauer White Tiger Racing