map sensor 88 astro

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  #1  
Old 12-24-02, 07:46 AM
cactus
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map sensor 88 astro

could someone tell me where the map sensor is on a 88 astro with a 4.3l , was changeing altenator, van ran great changed altenator and will not start, tested new alt and is fine, checked part numbers it is right alt, when i floor it the engine tries to fire, let off the gas and just keeps crankin with no spark, think it could be map sensor?, i have checked all spark plug wires and coil wire, has gas, any ideas man i am stuck
thanks
 
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  #2  
Old 12-24-02, 07:52 AM
Joe_F
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MAP sensor wouldn't cause a no spark condition.

Start with my "The Basics" post below. Let us know what you find.

As for the location of all the sensors, typically there is an emission diagram under the hood that gives the basic layout and vacuum line routing.
 
  #3  
Old 12-25-02, 01:47 AM
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Join Date: Mar 2002
Location: Louisiana
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Check ECM fuses (should be 2 of them). If power is lost to ECM, engine will start only run in WOT condition.
 
  #4  
Old 12-25-02, 02:43 PM
Joe_F
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Thumbs up

I'm with Dan in addition to reading "The Basics"
 
  #5  
Old 12-25-02, 06:24 PM
cactus
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88 astro

thanks for the replies, basics are read and done, good links, checked fuses, still nothing, guess it is time to pay a real mechanic to fix what i messed up, great board and once again thanks
 
  #6  
Old 12-26-02, 02:22 AM
Joe_F
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So still no spark? There are ways to test these things.

Check the autolibrary.org link in my signature file through "The Basics". Check for a bad module or pickup in the distributor. Both would cause a no spark/no start condition.
 
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