5.2 ZJ lambda, cat and performance - JeepForum.com
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post #1 of 4 Old 09-25-2017, 02:26 AM Thread Starter
SleepyDelegate
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1997 ZJ 
 
Join Date: Feb 2017
Location: Stary Jicin
Posts: 13
5.2 ZJ lambda, cat and performance

Hi friends,

I made a video of my lambda sensors and of the performance of my car in order to seek for any signs of malfunction or service needed. From what I see, a cat is dead. I also think the upstream lambda is slow and does not respond properly, which may result in lower mileage per gallon (Im european, so I would say higher consumption per 100km ).

Also, it seems to me, there could be a problem elsewhere: What do you guys think?
  1. a throttle doesn't go beyond 75% or so, why? I stomped it!
  2. the load doesn't go beyond 80% even though a gas pedal is on the floor. Why?
  3. between 0:02 and 0:03 you can hear a clunking sound comming from the undercariage, I don't know what that is, but it does that whne i floor it from 0. It doesn't do that when I floor it while driving above 30 or so...

Any suggestions or recommendations are highly appreciated!

Performance:
https://youtu.be/3kECq2QwGb8

Lambda:
https://youtu.be/3kECq2QwGb8?t=360

BTW, ZJ forever!

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post #2 of 4 Old 09-27-2017, 02:30 PM Thread Starter
SleepyDelegate
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1997 ZJ 
 
Join Date: Feb 2017
Location: Stary Jicin
Posts: 13
Really nobody?
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post #3 of 4 Old 09-28-2017, 09:34 AM
bmlarson12
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1997 ZJ 
 
Join Date: Apr 2012
Location: Fort Collins
Posts: 31
1. My throttle reading also only goes up to around 76%. The sensor is able to turn farther than the throttle body, so that is why it is limited.
2. My jeep's load value maxes out at a similar amount, not sure what that measurement really means.
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post #4 of 4 Old 09-28-2017, 09:47 AM Thread Starter
SleepyDelegate
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1997 ZJ 
 
Join Date: Feb 2017
Location: Stary Jicin
Posts: 13
Thank you, that makes me feel better... I thought there is something wrong with my throttle... Now I know there probably isn't.

About the load readings: I thought it is some kind of composite index of several factors, like throttle, air coming in, fuel coming in, RPMs etc. all combined together somehow, showing how much is the potential of the engine used... If not, then I will just ignore it, but if anyone could shed some light in it, I would appreciate it!
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