Just installed new injectors an now car idols rough
Reply #45 –
OK if you think you have dead cylinders there is a scope that is built in to your BODY. It is called a WET INDEX FINGER. With the engine started from cold wet you finger and touch it on the exhaust manifold next to the cylinder it connects to. Have you ever seen a person check an IRON for heat. My MOM used to wet her finger and touch the IRON. It would SIZZLE and tell her the iron was hot enough. The same can be dun with an engine. If the exhaust outlet is cold that cylinder is dead. At the track away from my equipment this is how we would test for a dead cylinder. I use this technique all the time. It works and just do it correctly so you do not burn yourself. With that if you have dead cylinders you just might have a vacuum leak near those group of cylinders. If in fact the engine ran good before the swap you messed something up. Also to check for a vacuum leak i used to close off the choke on carb engines. This reduces the air entering the engine and if it has a leak it will smooth out quite a bit. On an EFI engine this can be accomplished the same way with your hand. Or spray some carb cleaner in the intake sparingly and see if the engine runs better. With that i think running codes is a good idea. But Ford says you need a worm engine to get proper results. other than TPS for example. Other than that check the EGR and see if it is stuck open or has an exhaust leak past the PINTLE. Good luck
O2 Sensors do not effect a cold engine. The engine is in OPEN LOOP on start up stratigies. The HEGO has to be wormed up before they start working. Then in closed loop they come in to play!!
:burnout:
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