Misfire again, now rattling

jeep_boss

TJ Addict
Original poster
Supporting Member
Joined
Oct 10, 2017
Messages
1,148
Location
Seattle, WA, United States
This is getting absolutely ridiculous.

I made an attempt to patch the areas of my vacuum tubing today, that I found were leaking. Spent $8 on nylon tubing, thinking that if I can fix it with that, I can just return the Mopar vacuum harness scheduled to be delivered to me this evening.

I took a quick drive to see if the problem was still there, sure enough - it was. I can still hear a sucking through a straw type noise too (I do not remeber this happening prior to the theottle bosy / IAC cleaning that i did yesterday).

Drove back home, went inside to grab my gloves, and started my Jeep again. As I'm checking the vacuum line again, I'm starting to hear a rattling noise. I can't pinpoint it exactly, but it almost sounds like it is coming from my bell housing on the right side.

The sound of the rattle is almost like dieseling - it drowns out when RPMs increase.

THEN, as I go back in the can to turn the motor off, I see a CEL. My scanner shows another P0301! :( :( :(

At this point, I'm not sure where I should start. I do not thing a vacuum line is going to cause the misfire. I'm not even sure if I should waste my time replacing the vacuum tubing when it arrives.

I'm just as curious about the sucking theough a straw vacuum sound as I am about the misfire and this new horrific rattle!

What do you guys think? I'm close to the point of cutting my losses and parting out this piece of shit.
 
I'm not 100% sure, but the misfires seem to happen when i turn on my heater. I'm pretty sure the rattling that I'm hearing is the misfiring, I thought for a minite that I threw a rod - but it wasn't as loud as a thrown rod would be (more of a loud diseling sound).

SO.. here is my question - could faulty HVAC tubing cause a P0301 misfire????