Question about Pontiac Cars & Trucks
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Posted on Jan 02, 2017
SOURCE: cylinder 2 and 3 are misfiring
The head gasket may have blown between 2&3, but if the cat is getting hot, your ECM may be holding your injectors open. I would first unplug your #2 and #3 injectors, turn the key on but do not start and check for voltage between the pins. The way this engine is set up, it is squirt #1 and #4 injectors at the same time and then #2 and #3 injectors at the same time, so by the time your intake valve opens, you had one shot suspended around the valve, and then another once the valve opens. The hot cat seems to to tell me that the fuel is burning off in the cat since #2 and #3 are misfiring. Problem is, most of the time the computer gives the injectors a ground while voltage is waiting, so you must check between the two pins for each injector or you will be providing a seperate ground if you ground the meter anywhere else. If the voltage shows between the two pins, then you need to find out whether or not it is the computer grounding the injectors, or a wire grounded somewhere giving the injectors a ground. Once you finally get this fixed, plan to have to buy a new catalytic converter, as it will most likely be plugged or about to be in the near future.
Posted on Feb 26, 2009
have you checked to see if the injector is not leaking? this would explain what youre experiencing. another would be a plugged catalytic convertor. what happened when it died in the first place?
Posted on Dec 24, 2009
run engine until problem occurs. turn engine off or let it die. leave key on but don't start engine. put a paper clip in diagnostic plug under steering column. look at area on dash where service engine soon flashes. count flashes. (ex. 1flash-1,1 flashes=1,2. if you see 1flash of service engine soon, then 5 flashes in a row the diagnostic check = 1,5. It will flash this several times in a row. this is your code. look it up or ask and find out what it is. this is usually your problem area. let the car tell you.
Posted on Jan 22, 2010
there is probably a dead spot in the fuel pump,and when it is hot and you shut off the car it will not run.Next time the car does not start,bang on the gas tank with a piece of wood or spray some starter fuel in the throttle body. if it starts,it is a fuel problem.
use a spark tester to see if there is spark as well.ignition modules and coil packs are common on those cars,as well as the EGR valve getting stuck.that will cause the car to idle ok but die out as soon as 2500 rpm is reached.
Posted on Apr 14, 2010
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