What can be causing this?

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Jun 30, 2009 | 03:49 PM

tonmarchelli

Thread Starter

Racer

Joined: Apr 2009

Posts: 403

Likes: 9

From: Surprise AZ

What can be causing this?

Been having that rocks in a coffee can rattle on hard acceleration sound for the last few months. Comes from the front of the car and happens only under hard acceleration, otherwise the car is smooth. was told it was detonation from the gas i was using because i put 89 in it. was told to put 91 in it with a bottle of techron top end cleaner. Tried that without resolution of the problem.

any other ideas on what this might be? or how I can fix it?

Thanks

Jun 30, 2009 | 05:00 PM

bumble-z

Le Mans Master

Joined: May 2007

Posts: 5,393

Likes: 17

From: Belleville Mich.

You have to narrow the noise down to a more specific, centralized area of the car in order to get a reasonable answer to your question.. More info needed.

Jun 30, 2009 | 05:02 PM

Vetteman Jack

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Perhaps a bad knock sensor. Just a guess. Might try the Tech section too.

Jun 30, 2009 | 05:24 PM

bucwheat

Race Director

Joined: Oct 2007

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From: 4th on the list of top 100 in USA Ga.

Quote:

Originally Posted by JDs00PewterCoupe

Perhaps a bad knock sensor. Just a guess. Might try the Tech section too.

My first guess,are you running Top grade gas?

Jun 30, 2009 | 05:27 PM

jbondfl

Melting Slicks

Joined: Aug 2006

Posts: 2,866

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From: Tampa Bay, Go BUCS!!!Go Rays!!!Go Lightning!!!

St. Jude Donor '12-'13-'14

definitey sounds like detonation (knock) to me. Take care NOT to force it until you get a chance to fix it.
Only use premium fuel and if it continues get a tune up.

Jun 30, 2009 | 05:27 PM

lil vette

Melting Slicks

Joined: Apr 2007

Posts: 2,916

Likes: 1

From: West Palm Beach Florida

Timing set too far advanced
.

Jun 30, 2009 | 05:43 PM

tonmarchelli

Thread Starter

Racer

Joined: Apr 2009

Posts: 403

Likes: 9

From: Surprise AZ

Thanks for the hints so far. I bought the car a few months ago, ran 89 for a few weeks then switched to the 91. Only chevron.
If the timing is off, how do I diagnose/repair that?

Jun 30, 2009 | 09:55 PM

ecoman

Burning Brakes

Joined: Nov 2007

Posts: 1,121

Likes: 0

From: naugatuck ct

Quote:

Originally Posted by tonmarchelli

Thanks for the hints so far. I bought the car a few months ago, ran 89 for a few weeks then switched to the 91. Only chevron.
If the timing is off, how do I diagnose/repair that?

Bring it to a tuner and only use 91 octane or higher.

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Jun 30, 2009 | 10:00 PM

VinnyT

Le Mans Master

Joined: Jan 2007

Posts: 7,364

Likes: 6

From: Rocky Mount Virginia

You may have carbon build up in the combustion chambers. This will cause detonation even with high octane fuel. I would try to Seafoam it and try to get rid of the carbon.

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