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1997 STS - hard start, backfire when cranking

2K views 4 replies 4 participants last post by  vincentm 
#1 ·
My 1997 sts with a northstar won't start. It turns over and backfires thru the manifold.
 
#2 ·
Welcome Aboard !!!! Go up a thread or two and study the proper car/year/system parts in the sticky post "How to pull codes". That gives you the advice on how to retrieve any stored codes from the car's built-in scanner/reader. Practice, write down any found codes and whether each is Current or History. Go back to the sticky and open the link with "obd2" in the address to get to a Master Index of all codes. Decipher the codes, write it all down and post it here.

Has anyone recently messed with the spark plug wires and/or coils ?? How old are they ? Are the plug wires connected to the correct coil terminals ?
 
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