2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

s4 or s5

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Old Nov 10, 2002 | 12:47 AM
  #1  
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Question s4 or s5

can someone help me out here i need to know if my motor is an s4 or s5 so i will know wether or not i can remove my air pump. its not the stock motor in the car and im not sure the year it came out of.
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Old Nov 10, 2002 | 12:53 AM
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From: Naperville, IL.
i think the port actuators on the s4 engines are different. find a pic somewhere.
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Old Nov 10, 2002 | 01:50 AM
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If it's 86-88, then it'll say "13B Injection" on the top of the throttle body. If it's 89-91, it doesn't say that.

I'm sorry that I couldn't be more descriptive...I haven't seen a N/A engine in a while.
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Old Nov 10, 2002 | 03:00 AM
  #4  
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my 89 GTU says that on top of the TB...as does my friends S5 GXL.
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Old Nov 10, 2002 | 03:02 AM
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the S4 ones (86-88) the writing is black...and is sunken in, in the metal. --_-- S5's __--__

The _ is the writing :P and the -- is the writing on the new blocks.....if you can understand :P
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Old Nov 10, 2002 | 10:24 AM
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The S4 ones have writing and heat sink ridges on the dynamic chamber, the S5 ones only have writing.
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Old Nov 10, 2002 | 04:17 PM
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The S4 has a mechanical OMP, the S5 is electrical.
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