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Old 07-14-2013, 02:51 PM   #1
90notchback90
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Default 94 gt spark knock

Hi guys,
I just picked up a nice 94 gt 5 speed with 90k miles. It's been drivin maybe 100 miles in the last year. When I tach out a gear it spark knocks the more Tom's the worse it gets. Maybe it's old gas? Any ideas? Thank you
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Old 07-14-2013, 08:06 PM   #2
clowe1965
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TOM'S?
Guessing some autocorrect bs happened. When does it knock, just at the top? Go ahead and put some fresh gas in it, not like its going to hurt anything. Have you done any maintenance yet?
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Old 07-14-2013, 08:49 PM   #3
JimC
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Wrong section - moved from S197 5.0 section
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Old 07-14-2013, 09:25 PM   #4
mjr46
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seafoam it, check where base timing is set and run premium gas
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Old 07-14-2013, 09:51 PM   #5
90notchback90
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Originally Posted by clowe1965 View Post
TOM'S?
Guessing some autocorrect bs happened. When does it knock, just at the top? Go ahead and put some fresh gas in it, not like its going to hurt anything. Have you done any maintenance yet?
Rpm's not Tom's.. No maintenance yet just got it a few hours ago.
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Old 07-14-2013, 09:53 PM   #6
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seafoam it, check where base timing is set and run premium gas
Thanks, I will do that along with a full Tune up.
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Old 07-15-2013, 06:41 AM   #7
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seafoam it, check where base timing is set and run premium gas
What are the correct steps to sea foam a 94 gt? I know some people just pour it in the gas but I'm guessing a need to run it through a vacume line while its running? Thanks
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Old 07-15-2013, 08:09 AM   #8
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while the engine is running pull the break booster vacuum line . A lot of people just pour it right in I like to use a small kerosene funnel or something so its not so tricky to get it in the line. Its gonna smoke , ALOT. And if you pour it too quickly the engine will stumble and die.
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Old 07-15-2013, 08:23 AM   #9
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Let the engine warm up then you pour in 1/3 of the can, let the engine suck it in. Easiest to pour the 2/3 into the gas tank, then suck up the remaining third. After the seafoam is sucked up shut the engine off. Best to get a second person to shut it down and give it gas while sucking it up to keep it from dying.

Don't forget the fuel filter, it can cause problems too.
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Old 07-15-2013, 12:43 PM   #10
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Quote:
Originally Posted by 90notchback90 View Post
What are the correct steps to sea foam a 94 gt? I know some people just pour it in the gas but I'm guessing a need to run it through a vacume line while its running? Thanks
on the back of the can it has all the directions, I often use the can that has a nozzle that allows the intake to draw it in after the Maf
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