Renix Idle Issues / Pop/Misfire on Throttle

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Sep 7, 2019 | 04:42 PM

justfalcon

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Joined: Sep 2019

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Year: 1990 Wagoneer XJ

Model: Cherokee (XJ)

Engine: 4.0 Renix

Renix Idle Issues / Pop/Misfire on Throttle

Did cruiser54s throttle body mod - tapped npt fitting and ran new line to a brand new MAP sensor - fixed idle startup issues right away. Cleaned TB, new gasket, etc.

Got rid of engine vac harness and ran lines straight per the diagram - see video

No vac lines are loose/slide off easily

Somewhere along the last few weeks the evap canister lines got unplugged and I've somehow apparently lost the vac line from canister to fuel vent.

I've scoured the earth for a dummy/DIY guide for replacing that whole line and cannot find anything. Underneath the jeep on pass side there was a 90 degree hardline that looks like it goes to a vac line towards the rear that had nothing on it so I connected a new vac line between that and the canister and reconnected the line to the airbox and that seems to have fixed the massive fuel/exhaust smell that I was getting.

New o2 sensor was just put in, so don't mind the smoking/clearing the PB Blast off in the video

After doing all of this the idle was real high ~1500rpm but couldn't find any vac leaks - adjusted the TPS slightly counterclockwise and it has fixed the issue and idle is back at ~800rpm

Now - when I give it throttle I'm getting a new issue - sounds like some sort of backfire/pop as noted in the video.

Is it something to do with how I have the vac lines routed? The doorman harness paired up with the diagram seems to have some redundancies which I've gotten rid of in the layout in the video.

Any ideas? I'm still getting a slight exhaust/gas smell while standing out of the jeep w/ the driver door open but can't pinpoint anything...