Northstar Engines and System Technical Discussion Discussion, 1997 STS - hard start, backfire when cranking in Cadillac Engine Discussion; My 1997 sts with a northstar won't start. It turns over and backfires thru the manifold....
Automobile(s): 2002.5 F55 STS, 2014 Explorer XLT 4WD
MD Eastern Shore
Re: 1997 STS - hard start, backfire when cranking
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 ?