Bandito
NAXJA Forum User
- Location
- chattanooga, tn
I recently decided to do a small overhaul on my jeep's fuel system due to sluggish performance. I changed the fuel filter, the old one dumped a kinda murky brown fuel out when i got it out. Not as bad or as much as i expected... then i did an injector change. All were oem spec injectors. I noticed my injector ports were HEAVILY clogged with junk so i cleaned them. Well about a week after the fuel filter and injector change, it started to make a knock, not a tap or tick.. but a knock at idle. Not one that sounds like its going to blow a crater in the block, but a noticeable knock. Only at idle and only after driving for a little while. When given gas, it goes away. When its a cold start, its non existing. After driving for like 15-20 mins, ill come to a stop and hear a knock on one cylinder, cyl. 4 i believe. I checked injector plugs and theyre all connected. My best guess is its the original fuel pump and its going out. I think its fine when its cold then when the motor in it warms up, it loses its prime causing low fuel pressure and poor performance. No, i havent checked the fuel pressure on a cold start and warm, i dont have the tool to do it. I could go rent one at a parts store though, but even if i do.. i dont know what im looking for, fuel pressure wise. What should the fuel pressure be? Does this sound like a bad fuel pump? Any help is appreciated!
P.s. ive been driving it like this for about a month or 2 with no change. I tried a different weight oil and lucas additive. No change.
P.s. ive been driving it like this for about a month or 2 with no change. I tried a different weight oil and lucas additive. No change.