Running rough

[CToney]

I just swapped my turbo and injectors off of my wrecked '93 onto my new to me '92. I also advanced the timing to where the pump was turned on my old truck. I turned the fuel screw a quarter turn as well. The truck fired up right away and soon died and then ran real rough and smoothed out some. It did not smoke much. It seemed to run a little rough. The engine seems to shake a bit. I used a stethescope to listen to the injectors and they all sound similar but a bit different. The back three cylinders seemed to be putting out more heat than the front three. The injectors have not been used for a couple years. Do I just need to run injector cleaner through them? Is my timing too much? Need some help. The old injectors went back on my '93. They smoked alot of white smoke until the truck warmed up. Thanks for the help.



Chuck

 

[JGrefenstette]

i would suggest pulling the injectors and pressure testing them. i cant remember, but to you have to remove the pump cover to advance the timing??? if soo, you may have some air in the sytem, that its choking on.

 

[CToney]

To advance the timing you loosen the three bolts that bolt the pump to the housing and the one bolt on the injector lines and rotate the pump towards the intake manifold. Stock is finger wide way and advanced is finger the narrow way. The injectors don't even have 60,000 miles on them they have just sat a couple years. maybe I'll run some cleaner through them.

 

[dpuckett]

The sitting will coke them up. The fuel in them will start to break down after a couple of months, and start to varnish the internals. You could have a few sticky injectors. May not be much, but it doesnt take much, either. I'd get them cleaned up and the pop pressures reset. I had a 93 one time with <150K and all the injectors were 1000-1500psi low. I gained 4mpg after getting them cleaned and reset.



Daniel