lean cyclinders

[Contrldsub]

3 of my cyclinders are running lean, freshly rebuild motor and they were lean prior to the rebuild. all new gaskets, everything torqued to spec, only thing i can figure is something to do with the injectors?

are there larger injectors i could go to?

 

[chrwilkins30]

You should not need larger injectors with a stock rebuild. Make sure the ones in there are working properly.

 

[trail B2]

Are those three cylinders on one bank?If there not is there any way a vacuum leak could affect those three cylinders by the way they line up in the intake manifold?

 

[Contrldsub]

they were lean before i rebuild the motor and reassembled everything (twice). 2 are on the passenger side one is the middle on the driver side. it does not seem that there is a common link possible to me, i thought that perhaps a vaccum leak or bad O2 sensor could be causing it. but it seems like a strech to me.... im going to pull them all out and see about cleaning them. put some new plugs in and see what happens.

 

[trxusrngr]

Pull Your Injectors and Ohm test them. There is a voltage impedance given. its like 12-16 ohms of impedance i think....Don't quote me. but if those three injectors happen to have raised that impedance due to age or any sort of other malfunction within the injector It will not receive the correct voltage signals to complete a full injection of fuel into the cylinders.(Volume or rate of injection) This actually very key to propper engine performance. I tested mine about two weeks ago and they were all between 14.2-14.6 ohms of resistance. Depending on the year of your truck(if it is OBDII) you can do a flow test through the computer to make sure they are working properly. OBDI Goodluck testing the Mechanical side, i found nobody with an old flow test machine to test them!