Question about 1990 Toyota Cressida

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When accelerating at times a noise emits from the engine I think it is possibly the fact that my wife always uses 87 octane instead of 92. What do you think?

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I agree... in a 90's vintage car the computers are not as adept at adjusting the fuel / air mixture for different octane fuels. Put in the higher octane fuel if you know you'll be driving the car under a heavy load.

Posted on Sep 15, 2010

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I have changed my distributor on my rialto 2 car and at medium revs whilst driving it sounds like a bag of nails tried to turn the distributor left to wright it does queten down but still make noise


the noise is most probably detonation of uncontrolled combustion of the mixture in the cylinders
The ignition timing should be no more than 10-12 degrees BTDC
max
If you have described the noise accurately, it occurs mostly on acceleration or when the engine is under load
it is from wrong timing or lean fuel/air mixture or incorrect fuel rating used for the engine ( octane rated at 89 instead of 92 +)
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As a vehicle ages, the timing gets off, and the Octane of fuel will compensate for an out of timing vehicle.
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Use a "GOOD" fuel system cleaner for the next 3 tankfuls, and use a higher octane fuel at the same time!!! This is important. After 3 tankfuls and 3 additions of a Fuel System Cleaner, go back to a lower octane fuel. Drive up a hill and see if the problem is gone. If not, then either take it to a mechanic and check timing, hopefully you replaced the fuel filter by then.

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Can I use 87 octane gas on 2004 Ferrari 360 Modena?


Have to use what the MFG calls for,
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I find that my 2006 Buick Rendezous runs better on 89 and gets better gas miles than 87. I sometimes start it and then it will have to be restarted again on 87. I even put in fuel injector cleaner and gas...


92 octane is wise to use once a month if you drive 1500 miles or more a month. Although I would use a half a tank of 92 octane when doing so. That blend has more additives which is great for larger engines such as a large V8

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What grade gas should be used ?


You should always use premium fuel on the high conmpression V8 engine. Cheaper fuel can cause a PING, and possible engine damage. 87 octane is definitely not recommended at any time, but sometimes you can get by with 89 for a small period of time.

Gas mileage and power will both be down with lower octane fuel, so do not use it all the time.

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What octane fuel used in 98 Cadillac 4.6


having over 30 years with general motors and 10 with cadillac the standard 87 octane can be used in your northstar engine
premium is noted on the dash cluster to the owner of course for the price they paid for a 300 horsepowered engine seems they octane should be using the highest made octane to use. it is another bad reflection from general motors in their part. I owned a 96 de ville and always ran 87 octane and took it out west in 98. I cruised at 90 mph through Nevada and received 29 mpg

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I have a code # po332 on my 2005 chevy silverado, I cleared it and the code reappeared after two weeks. I use 92 octane fuel and do not hear any knocking noises coming from the engine.


This engine is made to run on 87 octane.Sometimes when using a higher octane can cause a check engine light or other driveability problems.If you don`t think it is your knock sensors then get some used ones at the salvage yard and try them.They are under the upper intake plenum.

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Getting better gas milage....


Hey there, well if its anything like mine(91 cressy) its pretty thirsty! but things worth checking(if u havnt already) are the engine timing, fuel filter, air filter, as they will make a huge differnce. still im getting 11L per 100 around town, and i dont exactly flog it. and about the octane, i realy wouldnt worry too much if its just the non turbo version, although sticking to 91octane or above is always a good idea. usually only costs a few extra dollars a tank for 98 octane here in Australia, so i think its worth it.

Cheers
Andrew from Queensland

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try the coolant temp sensor...if its getting the wrong readings then it will fuel accordingly....

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Your ignition timing may have advanced too far. Or it is now where it should be and is making more cylinder pressure during combustion causing the gasoline to ignite to early causing detonation or ping.

Make sure the ignition timing is correct. If it is try better fuel meaning the octane rating.

If you can go up to the next octane level. For example if you are using 87 go to 89 and see if it goes away. 3 of my wife's last cars a 1986 Honda Prelude, 2000 Neon, and a 2003 Neon had some ping under medium to hard acceleration. She switched to 89 octane and the ping went away completely in each vehicle. Each of the vehicle had a good deal of miles on them.

The 2003 Neon has 75000 miles on it now and runs great on 89 octane. About a year ago I tried 87 Octane in her car and the ping came right back.

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