Engine Noise??

SteveAZ · 05-15-2003, 11:01 PM

Here is a weird one. Under hard excelleration My engine makes a funny sound like Valves rattling (Shatter sound) and its like a major power boost and alot of smoke comes out of the tail pipes.
This does not happen everytime but it does happen alot. Anything someone may have to help me diagnose this is greatly appreciated. Thanks,

LX5liter · 05-17-2003, 11:33 AM

Sounds like detonation to me. Are you running 92+ octane fuel? Check your timing (or have it checked ) and post the results.

Chris_H · 05-18-2003, 05:24 PM

I agree with LX, sounds like detonation to me. Not a good thing. I know since its getting a lot hotter around here in the desert, you guys are getting pretty hot too. We've been in the 100's all week and detonation for me tends to show up a lot more with the heat. Definately check your timing and make sure you are running 92+ octane like LX was saying. About what rpm is this happening at?

Chris

05-15-2003, 11:01 PM	#1
SteveAZ Registered Member Join Date: Apr 2003 Location: Phoenix, AZ Posts: 10	Engine Noise?? Here is a weird one. Under hard excelleration My engine makes a funny sound like Valves rattling (Shatter sound) and its like a major power boost and alot of smoke comes out of the tail pipes. This does not happen everytime but it does happen alot. Anything someone may have to help me diagnose this is greatly appreciated. Thanks, __________________ 1995 GT

05-17-2003, 11:33 AM	#2
LX5liter dude5l Join Date: May 2001 Location: Grande Prairie, Alberta, Canada Posts: 603	Sounds like detonation to me. Are you running 92+ octane fuel? Check your timing (or have it checked ) and post the results. __________________ Good luck! Brad R. 1992 L.X. 5.0 coupe MODS: A few little bolt ons New Best time ...11.60 @ 128 mph @ 2000+ ft altitude. Rice Haters Club member #39 Users rides #2542

05-18-2003, 05:24 PM	#3
Chris_H Registered Member Join Date: Oct 1999 Location: New Mexico Posts: 488	I agree with LX, sounds like detonation to me. Not a good thing. I know since its getting a lot hotter around here in the desert, you guys are getting pretty hot too. We've been in the 100's all week and detonation for me tends to show up a lot more with the heat. Definately check your timing and make sure you are running 92+ octane like LX was saying. About what rpm is this happening at? Chris __________________ 1987 LX, Best times: 13.47 @ 102.49, 1.80 60ft 6900' DA

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