C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

91 L98 - compression test results.

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Old Apr 21, 2003 | 02:37 PM
  #1  
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Default 91 L98 - compression test results.

2 weeks ago i had to fix a misfire that a dealer caused - part of the diagnosis i I had a compression test done. here are the results:

# 1 224 #2 215
#3 225 #4 213
#5 223 #6 210
#7 220 #8 215

How do these numbers look?

Also today after driving about 500 miles on it since picking it up - when idling it seems to jump ever so often. thoughts?

TIA,
>mike
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Old Apr 21, 2003 | 02:54 PM
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Default Re: 91 L98 - compression test results. (mikeg826)

I wish I had those numbers... Mine are 170-180 range. :cry
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Old Apr 21, 2003 | 03:02 PM
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Default Re: 91 L98 - compression test results. (mikeg826)

After seeing those numbers you'll have to change your name to "Mr Good Luck"; very nice results.

You might check the plugs and wires; also see if the TB & plates are carboned up. If so use some TB cleaner on them.
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Old Apr 21, 2003 | 03:15 PM
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Default Re: 91 L98 - compression test results. (65Z01)

After seeing those numbers you'll have to change your name to "Mr Good Luck"; very nice results.

You might check the plugs and wires; also see if the TB & plates are carboned up. If so use some TB cleaner on them.
just had the plugs changed (2 of the wires were on reverse - thanks to the Dealer :mad: ) and wires were changed along with the ignition cable which was burned.

I'll check the TB this weeked hopefully. what's best cleaner to use?


[Modified by mikeg826, 3:16 PM 4/21/2003]
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Old Apr 21, 2003 | 03:21 PM
  #5  
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Default Re: 91 L98 - compression test results. (mikeg826)

After seeing those numbers you'll have to change your name to "Mr Good Luck"; very nice results.

You might check the plugs and wires; also see if the TB & plates are carboned up. If so use some TB cleaner on them.

just had the plugs changed (2 of the wires were on reverse - thanks to the Dealer :mad: ) and wires were changed along with the ignition cable which was burned.

I'll check the TB this weeked hopefully. what's best cleaner to use?


[Modified by mikeg826, 3:16 PM 4/21/2003]
Got to love those dealers :banghead:
You can use TB cleaner or if you take it off use carb clean :cheers:
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Old Apr 21, 2003 | 07:35 PM
  #6  
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Default Re: 91 L98 - compression test results. (Mike's 86)

My 90 only put up 190 on all 8 cylinders. Those are some good numbers
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Old Apr 21, 2003 | 09:00 PM
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Default Re: 91 L98 - compression test results. (Dr. Evil)

I got it, no one told him not to hit the NO2 during the compression test. :eek:
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