Lesson Learned?

Black Sun 5.0

Founding Member

Mar 23, 2002

1,337

0

36

L.I., N.Y.

Aug 10, 2005

#1

• Aug 10, 2005

• #1

A few days ago I ran a post about a strange sound coming from the front of my engine area. I thought it may have been a pulley, maybe the alternator. Turns out, after I tested a theory, that I used too low an octane in my car. I filled up with 89 last weekend, around the time I noticed the sound. Last night, I capped off my tank with 3 gallons of 93 octane, the noise immediately disappeared. I only heard this sound at idle. Think upgrading to #24 injectors saved my engine?

 

bobcatv8

Member

Aug 25, 2004

141

1

16

Ocala,FL

Aug 10, 2005

#2

• Aug 10, 2005

• #2

Been there, done that!
If I use anything but premium in my 170,000 mile bone stock '88 it pings like heck. Been that way since brand new!

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

34

129

Aug 10, 2005

#3

• Aug 10, 2005

• #3

How does one get detonation only at idle. I dont think I could get detonation at idle, even if I had it in higher rpms. There is no load on the motor.

Anyhow, glad you seem to have remedied the issue.

 

DMAN302

My mom says thanks for the pearl necklace.

Nov 8, 2003

2,120

2

59

windsor, Canada

Aug 10, 2005

#4

• Aug 10, 2005

• #4

HISSIN50 said:

How does one get detonation only at idle. I dont think I could get detonation at idle, even if I had it in higher rpms. There is no load on the motor.

Anyhow, glad you seem to have remedied the issue.

Click to expand...

Seriously...just sounds a little strange, detonation at idle would be a first for me. Also glad you seemed to have stopped it...but I'm not sure it's remedied.

 

Black Sun 5.0

Founding Member

Mar 23, 2002

1,337

0

36

L.I., N.Y.

Aug 11, 2005

#5

• Aug 11, 2005

• #5

Like I said, higher octane killed the noise. I've had some fuel probs, also had cats that were burning up at idle that the shop told me was a lean condition. Ended up taking the cats out.

 

K

kystang1889

New Member

Dec 29, 2002

199

0

0

ky

Aug 11, 2005

#6

• Aug 11, 2005

• #6

whats your timming set at? Do you have higher comp. ratio?

 

darthcual

Member

Mar 31, 2005

985

19

18

Arlington, TX

Aug 11, 2005

#7

• Aug 11, 2005

• #7

You might have carbon build up that is making a higher compression and ur engine doesnt like the faster burning (lower) octane. Or previous owner feed him nothing but blondes, and now brunettes just wont due.