crank/cam sensor or fuel related problems - Page 7 - JeepForum.com
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post #91 of 98 Old 07-03-2009, 11:05 PM Thread Starter
BLACKzj52
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The crank sensor got replaced like 2 weeks ago. Didn't make a difference. Bling you ever figure out ur issues yet?
Mine still likes to sputter/bogg every now and then and occasionally backfire through the intake.
Some guys at the shop I took it to said my plenum gasket is bad. I asked how and they just said its not a matter of how but when (they specialize in jeeps and are particularly fond of 5.2 zjs and gc's in general) I might look into that on mine. Mines also running lean so we replaced both o2 sensors. Still running lean. Wtf


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- 1996 Black ZJ Limited: 5.9 swap, LA's, axles, absolutely built to hell
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post #92 of 98 Old 07-04-2009, 07:27 AM
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It could very well be a failed plenum gasket. Usually if the gasket is bad, looking down through the throttle body you will see oil that has leaked into the intake manifold. Pinging is also common with a leaking plenum gasket. The bad gasket is cause by the fact that the intake manifold is aluminum and the plenum plate is steel and the two have different expansion rates. The best fix is to replace the steel plenum plate with an aluminum plate, and then install the new gasket. You can get an aluminum plenum plate here. http://www.hughesengines.com/Index/p...2&partid=22220

Unfortunately, replacing the plate and gasket (or even just the gasket) is somewhat labor intensive so the shop time can be expensive.

These comments from the Hughes site are informative.
Quote:
Also keep in mind that when the plenum cover gasket leaks it causes oil to be drawn into the intake manifold. This causes increased oil usage, smoking, pinging and power loss. The additional oil usage will cause excessive carbon to build up on the oxygen sensor. The carbon acts as an insulator effecting the operation of the sensor which controls the power, mileage and emissions. We suggest you install a new pre-catalytic (front) O2 sensor when replacing the plenum cover and gasket.
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post #93 of 98 Old 07-05-2009, 10:23 PM Thread Starter
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Originally Posted by rm2001wj View Post
It could very well be a failed plenum gasket. Usually if the gasket is bad, looking down through the throttle body you will see oil that has leaked into the intake manifold. Pinging is also common with a leaking plenum gasket. The bad gasket is cause by the fact that the intake manifold is aluminum and the plenum plate is steel and the two have different expansion rates. The best fix is to replace the steel plenum plate with an aluminum plate, and then install the new gasket. You can get an aluminum plenum plate here. http://www.hughesengines.com/Index/p...2&partid=22220

Unfortunately, replacing the plate and gasket (or even just the gasket) is somewhat labor intensive so the shop time can be expensive.

These comments from the Hughes site are informative.
Ahhh that would make sense (alum vs steel statement). And I was gonna replace it with the hughes plate to begin withj For some reason I do remember looking down my throttle body at some point and seeing oil, as well as smelling it. Its definitely done then. Ill check again tomorrow. I don't have any pinging and after cleaning the terminals to my ecu I got a little bit more of my power back but not all just yet. And I'm not sure but on my way back from offroading today (after cleaning the terminals) I didn't have any spit/sputter/bog at all, well see tomorrow if I still do or not. And now my engine light is gone. Sounds like plenum is the final fix and ill be good.

And shop? Hell ill do it myself. Read a write up in the past when I was bored and it looked easy just time consuming

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- 1996 Black ZJ Limited: 5.9 swap, LA's, axles, absolutely built to hell
- 1998 Platinum 5.9 Limited: DD with some lighter modifications
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post #94 of 98 Old 07-06-2009, 08:50 AM
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Quote:
Originally Posted by BLACKzj52 View Post
........

And shop? Hell ill do it myself. Read a write up in the past when I was bored and it looked easy just time consuming
Thats what I would do.
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post #95 of 98 Old 07-06-2009, 09:32 AM Thread Starter
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Great minds think alike

Edit: just looked at the hughes site once again and noticed they recommend getting this when replacing the plenum
http://www.hughesengines.com/Index/p...5&partid=23039

Is this necessary or is it just them trying to sell you something else also?
If its ABSOLUTELY necessary then ill get both when I have the money

- John - 23 and learning <-- ORIGINAL
- 1996 Black ZJ Limited: 5.9 swap, LA's, axles, absolutely built to hell
- 1998 Platinum 5.9 Limited: DD with some lighter modifications
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Last edited by BLACKzj52; 07-06-2009 at 09:59 AM.
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post #96 of 98 Old 07-06-2009, 12:47 PM
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Originally Posted by BLACKzj52 View Post
Great minds think alike

Edit: just looked at the hughes site once again and noticed they recommend getting this when replacing the plenum
http://www.hughesengines.com/Index/p...5&partid=23039

Is this necessary or is it just them trying to sell you something else also?
If its ABSOLUTELY necessary then ill get both when I have the money
id prob do both at once eliminate the possibility of it being the one you didnt replace/

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post #97 of 98 Old 07-06-2009, 03:04 PM
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Quote:
Originally Posted by BLACKzj52 View Post
Great minds think alike

Edit: just looked at the hughes site once again and noticed they recommend getting this when replacing the plenum
http://www.hughesengines.com/Index/p...5&partid=23039

Is this necessary or is it just them trying to sell you something else also?
If its ABSOLUTELY necessary then ill get both when I have the money
The V8 PLENUM REINFORCEMENT KIT not absolutely necessary, but the cost is modest, and the work to install it adds almost nothing to that done when putting in a new gasket. That's assuming that you do both at the same time.
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post #98 of 98 Old 08-16-2009, 05:44 PM Thread Starter
BLACKzj52
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for anybody that is using the search function or just wanted to know for future reference
my solutions were:

-fill tranny all the way
-bad spark pluG
-fuel pump
-plenum gasket

- John - 23 and learning <-- ORIGINAL
- 1996 Black ZJ Limited: 5.9 swap, LA's, axles, absolutely built to hell
- 1998 Platinum 5.9 Limited: DD with some lighter modifications
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