Pre Detonation?!!!?!?!!

1fast94svt

New Member

Jun 14, 2004

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Michigan....Detroit

Aug 17, 2004

#1

• Aug 17, 2004

• #1

Guys, picking up my car from the shop today. Had head gaskets replaced. The old gasket he took out of the car had like 6 or 7 holes blew through it and damage along the holes for coolant and oil. The machanic is telling me im getting really bad detonation. The thing is i was never getting this before and all the parts are brand new, was it just because the gasket was on wrong and it just got really blew out, or do i have bad detonation? I have no boost retard on their but my tuner tuned around it. I just cant figure out why all of the sudden i wuold be getting pre det?!

 

1fast94svt

New Member

Jun 14, 2004

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Michigan....Detroit

Aug 17, 2004

#2

• Aug 17, 2004

• #2

aNYBODY???

 

stockhatch

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Oct 9, 2001

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polar sloth country

Aug 17, 2004

#3

• Aug 17, 2004

• #3

What kind of fuel system do you have? Also, change in the weather can cause detonation.

AC

 

1fast94svt

New Member

Jun 14, 2004

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Michigan....Detroit

Aug 17, 2004

#4

• Aug 17, 2004

• #4

i have Bosch 42lb injectors and a 255 fuel pump. I was told pre det could be ignition, timing, or fuel system problems, but its all brand new and i cant believe that it would go faulty so quick. The machanic is turning up the timing to 23 degrees to be safe, do you think im ok in boost mode or should i keep it down until i sell it? Trading her in on thur i htink for a silver 03 cobra.

 

stockhatch

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Oct 9, 2001

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polar sloth country

Aug 17, 2004

#5

• Aug 17, 2004

• #5

If he backed the timing DOWN to 23 total what was it to begin with? Sounds like you may have had too much timing. Do you have a chip burnt for it? You said you had it tuned...I would stick it on a dyno and see if something obvious was going on if it were me. Or you could just be nice to it until you trade it in and let the next owner worry about it lol.

AC

 

Tomato

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Apr 9, 2003

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Calgary

Aug 17, 2004

#6

• Aug 17, 2004

• #6

you had holes blown through the gasket? huh? Pre detonation?? LOL, it's either detonating, or its not,no such thing as "pre" detonation.

Typically, the gasket will be blown out either between 2 adjacent cylinders a the thinnest part, ot between the cylinder and a water passage.

Get a proper tune.

The bloody 94-95 computers REALLY suck. I would be tempted to swpa in a A9L and get it re tuned.

 

stockhatch

Founding Member

Oct 9, 2001

536

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polar sloth country

Aug 17, 2004

#7

• Aug 17, 2004

• #7

Tomato said:

you had holes blown through the gasket? huh? Pre detonation?? LOL, it's either detonating, or its not,no such thing as "pre" detonation.

Click to expand...

I was going to say something about that too, but I knew what he meant. It can be preIGNITION or detonation... Either way, the outcome is not good

AC

 

HISSIN50

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

15 Year Member

Nov 29, 1999

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Aug 17, 2004

#8

• Aug 17, 2004

• #8

you are running locked out timing right? that is not a bad plan with a blower. what was it before?