Bogging Down

[Oddmodman]

Hi guys. I just bought a 1990 cherokee, ax15, np231. It has a very very slight knock, and when it reaches about 2100 rpm or so it starts bogging down. I didn't buy it for its engine anyhow, but I'm curious if people have encountered the same problem. Perhaps CPS or fuel filter? Those'd be my guesses.

[cruiser54]

Hi guys. I just bought a 1990 cherokee, ax15, np231. It has a very very slight knock, and when it reaches about 2100 rpm or so it starts bogging down. I didn't buy it for its engine anyhow, but I'm curious if people have encountered the same problem. Perhaps CPS or fuel filter? Those'd be my guesses.

Check the fuel pressure. Also, since it's a REnix Jeep, you need to do some groundwork. Click on the link in my signature.

[Oddmodman]

Ah, Cruiser54, thank you. I actually went over this yesterday funnily enough. I have two questions for you. Don't mean to seem like a dunce, but what exactly does the Valve Cover Mod do? That hole in the side. Breathing? Also, what do you get out of the CPS Advance Mod? Does it actually advance your timing, delivering more power?

[cruiser54]

Ah, Cruiser54, thank you. I actually went over this yesterday funnily enough. I have two questions for you. Don't mean to seem like a dunce, but what exactly does the Valve Cover Mod do? That hole in the side. Breathing? Also, what do you get out of the CPS Advance Mod? Does it actually advance your timing, delivering more power?

VC mod helps keep oil from being sucked into the air filter. The CPS advance mod fools the eCU and you get more advance.

 

Do the ground refreshing, connector/relay refreshing, and sensor ground tests now and we'll go from there.