Hey guys started having a problem with my xj on the way home from work yesterday. Started acting sluggish. When you give it a bunch of gas you hear the engine sound like it wants to go through the airboxm but the oomph just is not there. I was thinking clogged cat or maybe bad fuel filter. I did just put seafoam in the tank about two hundred miles ago. do you think it could have loosened up some stuff that clogged the filter? Any ideas would be appreciated.
Thanks Brendan

 

Man, i have been banging my head with this one too ever since I put a bottle of seafoam in the tank. Now I have a rough idle and random misfire CEL

I have replaced everything imaginable other than the injectors, so I think my injectors are clogged and I just ordered a set last week. They should be here early in the week so I can swap them in and if that doesn't help then I don't know what will.

 

Well I am glad that I am not the only one. I am going to change the fuel filter today and see if that help, but otherwise I am going to have to clean the injectors.
Brendan

 

Well figured out the problem. Checked if the cat was plugged with a vac guage. Sure enough the cat is plugged up tight. So I should be getting one of those installed tomorrow.
Brendan

 

how do you check the cat with a vac gauge? I've never had to do that and it would probably be a good idea if I checked

 

Hook the vac guage up to intake vacuum. Run it into the cab with you. At idle the vacuum should be about 17. When you get on it the vacuum should drop a bit but then go back up. If you get on it and the vacuum just drops then the exhaust is plugged.
Brendan

 

thanks, but this morning I sprayed some carb cleaner around the intake where it meets the head, and I must have a crack at the number 1 cylinder because it bogs when I spray it there