Engine Mechanical problem
1996 Pontiac Grand Am 4 cyl Front Wheel Drive Manual 165000 miles
ok ! What I have is a 1996 pontiac grand am 2.4L dual overhead cam, electronic ignition. (IDI) " Intergrated Direct Ignition". System
its running very rough, getting bad gas milage. When I get off the freeway and come to a stop it stumbles and then picks back up. It does it at a stop light also, lacking power.
i hooked up my " OBD2" code reader, and it gave a reading of " P301" #1 cylinder Missfire Detected
#1) Replaced Plugs & Boots and coil housing
#2) I placed a ohm meter between #1 & #4 on the coil tower and it read 5.0 ohms the same between 2 & 3 and no reading between coil and cover Plate
#3) switched coils around to see if it was the coils. Still shows #1 Missfire
#4) I checked my ignition module by connecting a test light (at the module) between bat. Pos. Terminal to the coil(Terminal A) and terminal B or C. When cranking engine light blinks. According to the book tt that should eliminate the module from being bad. But to check for open or shorted circuit in the coil wiring harness. I didnt do that. How do I do that? And where do I do that?
#4) put a ohm meter to no.1 injector, the reading was within specs described in book.
#5) I Disconected the electrical connector to the (IAC) " idle air control valve" started engine and pulled off each injector connector to the injector and there was a noticable difference in idle change
i didnt have a spark tester light so I couldnt test that
from what I described you have any advise or instructions besides " take it to the shop"
Saturday, March 22nd, 2008 AT 2:57 PM