Hello all-
I've go a 1990 xj Auto trans. I bought it with a blown motor, put a junkyard comanche motor in and it ran fine for a month. After the first time I ever held it at wide open throttle from 0-65 it started running very badly. It starts and idles fine and sounds like it is running good while you accelerate but will just barely run at a constant speed going down the road. I've been working on this for two weeks and am stumped.
So far I have:
replaced and adjusted TPS
replaced CPS
checked MAP sensor - good
checked temp sensor - good
checked all engine ground connections
checked fuel pressure - 39 PSI w/o vacuum 31 with vacuum
replaced plugs and wires
swapped in a good set of fuel injectors from another motor
replaced fuel filter
The plugs look like they have a lot of carbon on them. If I had to guess from looking at them I am running too rich but I don't know why.
Does anybody have any guesses where I need to look next?
Thanks
I've go a 1990 xj Auto trans. I bought it with a blown motor, put a junkyard comanche motor in and it ran fine for a month. After the first time I ever held it at wide open throttle from 0-65 it started running very badly. It starts and idles fine and sounds like it is running good while you accelerate but will just barely run at a constant speed going down the road. I've been working on this for two weeks and am stumped.
So far I have:
replaced and adjusted TPS
replaced CPS
checked MAP sensor - good
checked temp sensor - good
checked all engine ground connections
checked fuel pressure - 39 PSI w/o vacuum 31 with vacuum
replaced plugs and wires
swapped in a good set of fuel injectors from another motor
replaced fuel filter
The plugs look like they have a lot of carbon on them. If I had to guess from looking at them I am running too rich but I don't know why.
Does anybody have any guesses where I need to look next?
Thanks