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Unread 08-25-2014, 06:01 PM   #16
mike134
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The standard copper are usually better in most vehicles but dont last as long as the platinum clad plugs. The standard plugs should only last 15-20k miles although some platinum plugs can go to 100k

You should get better hc emissions with the standard type, but it may still not be enough to get you under the threshold

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Unread 08-25-2014, 06:19 PM   #17
mike134
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Also, what octane rating are you using? You may get slightly lower HC with 87 at the expense of slightly higher NO.
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Unread 08-25-2014, 08:09 PM   #18
jsd1991yj
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I did not know that about the plugs. I was always under the impression the platinum style plugs made a hotter more concentrated spark and therefore burned more of the fuel evenly. I will try cahnging out the plugs as they are only a couple of dollars each.

I currently run 87 octane in the jeep. I haven't had a reason to run the higher octane being its a lower compression engine.

I also forgot to say it does occassionally back fire in the lower rpms when I give it full throttle from almost no to light throttle.
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Unread 08-26-2014, 05:57 AM   #19
Que89YJ
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Cat going bad is almost always running too rich fur a long period of time. Is your fuel pressure good?
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Unread 08-26-2014, 08:44 AM   #20
jsd1991yj
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QUE I have been unable to test it so far. I have not been able to find one to borrow or rent and I am trying not to buy one just for a one time use.
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Unread 08-26-2014, 09:26 AM   #21
mike134
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Just call autozone for the fuel pressure gauge. Its free. You just need to leave a deposit to ensure you bring it back.
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Unread 08-26-2014, 09:28 AM   #22
mike134
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Sorry, double post. The forum said I had to repost with 1 more character in lenght
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Unread 08-27-2014, 09:36 AM   #23
jsd1991yj
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I just did the fuel pressure test. at idle it shows 38 psi and when I disconnect the vacuum hose it goes to 42 psi. When I shut the engine down the pressure drops to 32 psi. After about 20 minutes it read 24-25 psi. Im not sure if the guage has a leak in it because I kept feeling gas at all of the connections on the guage.

How do these readings rate?
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Unread 08-27-2014, 09:55 AM   #24
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Quote:
Originally Posted by jsd1991yj View Post
I just did the fuel pressure test. at idle it shows 38 psi and when I disconnect the vacuum hose it goes to 42 psi. When I shut the engine down the pressure drops to 32 psi. After about 20 minutes it read 24-25 psi. Im not sure if the guage has a leak in it because I kept feeling gas at all of the connections on the guage.

How do these readings rate?
Those readings are higher than it's supposed to be, but the same numbers on my 2.5L. Mine doesn't seem to run rich though... weird. I asked Que in a nother thread if this is OK or if we (I) need to resolve the fuel pressure back down to 31 at idle and 38 with the vacuum disconnected from the FPR.
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Unread 08-27-2014, 10:50 AM   #25
mike134
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Look for a vacuum leak on the hose connecting to the fuel pressure regulator. That can certainly cause higher pressure on the fuel rail. If that doesn't work, I would next consider swapping the fuel pressure regulator because it isn't regulating pressure like it is supposed to.
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Unread 08-27-2014, 07:13 PM   #26
jsd1991yj
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I dont think there is a leak. I have already sprayed the entire area with carb cleaner and did not get any fluctuations in the rpms.
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Unread 08-27-2014, 07:15 PM   #27
jsd1991yj
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LUUCA did Que get back to you with an answer about the presure?
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Unread 08-27-2014, 09:30 PM   #28
Luuca
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Quote:
Originally Posted by jsd1991yj
LUUCA did Que get back to you with an answer about the presure?
No but I know what he's gonna say..

Check the return line and swap out the FPR to see if it's more normal.

Posted via my pretentious iPhone.
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Unread 08-27-2014, 09:44 PM   #29
Que89YJ
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I saw the post with the advice they gave. They nailed it and I didn't see any point in adding to advise. Sounds like a vacuum issue to the regulator or the fpr itself.
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Unread 08-27-2014, 09:46 PM   #30
Luuca
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Quote:
Originally Posted by Que89YJ
I saw the post with the advice they gave. They nailed it and I didn't see any point in adding to advise. Sounds like a vacuum issue to the regulator or the fpr itself.
But... But .. You complete me.

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