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1991 Cadillac Sedan deVille
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530 Posts
I think that some of them like to knock, lol. After my mechanic installed new fuel injectors and EGR valve on my '91 it started knocking on low speed acceleration... it sounds like a rod knocking when engine is hot. I have just learned to live with it.
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
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19,840 Posts
I think that some of them like to knock, lol. After my mechanic installed new fuel injectors and EGR valve on my '91 it started knocking on low speed acceleration... it sounds like a rod knocking when engine is hot. I have just learned to live with it.
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are you using premium - 91 or higher gas?
 

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Super Moderator
White Diamond '03 DHS (with DTS floor shift)
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87,177 Posts
:yeah: The 4.9 "requires" 92 octane because it has no knock sensor.
 

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1991 Cadillac Brougham D'Elegance 5.7 Litre, 1994 DeVille
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6,796 Posts
Depending on the knock it could be timing if it's not adjusted properly.
 

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1992 DeVille, 2013 ATS 3.6
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2,366 Posts
Tennesseestorm said:
I think that some of them like to knock, lol. After my mechanic installed new fuel injectors and EGR valve on my '91 it started knocking on low speed acceleration... it sounds like a rod knocking when engine is hot. I have just learned to live with it.
Did you replace the egr solenoid and all egr vac lines yet? I know you were holding off on the solenoid. 30 bucks, one bolt. Super easy to do.

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If the system is functioning and timing is proper and you're running premium gas you shouldn't have a knock or detonation
 
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