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Unread 03-13-2014, 12:25 PM   #16
Louie4
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Fixing the CCV (Closed Crankcase Ventilation) system may help. The back hose on the valve cover goes to a port on the intake. The front is a fresh air inlet going to the air box.

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Unread 03-13-2014, 04:29 PM   #17
langwilliams
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could someone post a pic of what the vac lines off the rear of the valve cover on the 4.0 is supposed to look like? thanks.
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Unread 03-13-2014, 04:32 PM   #18
langwilliams
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here's what I have:

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Unread 03-13-2014, 08:32 PM   #19
plym49
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Quote:
Originally Posted by 82gt View Post
I was able to induce a small vacuum leak, but finally replaced the cat and have been groovy ever since
That makes no sense as once the engine warms up and enters closed loop operation, the ECU will richen the mixture to compensate for the vacuum leak and maintain the stoichiometric ratio.

BTW, OP: running injector cleaner is meaningless.
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Unread 03-14-2014, 09:35 AM   #20
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I passed my echeck in CLE after running seafoam through the throttle body, then the rest in the gas tank. ran it around for ~50 miles, then took it
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Unread 03-14-2014, 09:56 AM   #21
Tom95YJ
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Run a can of seafoam (1/2 in the gas tank, 1/2 through a vacuum hose) change the plugs/wires/ cap/ rotor then go back it'll clean it up it works like a charm on my 89 with carter carb all the time
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Unread 03-14-2014, 04:53 PM   #22
langwilliams
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thanks for the tips, going to do plugs an wires, cap this weekend. plugs look ugly an the one I pulled had a .053 gap!
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Unread 03-15-2014, 12:09 AM   #23
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Quote:
Originally Posted by langwilliams
thanks for the tips, going to do plugs an wires, cap this weekend. plugs look ugly an the one I pulled had a .053 gap!
.035 is spec unless you have done a Tfi or hei ignition then .045
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Unread 03-15-2014, 02:38 PM   #24
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Put two cans of dry gas into a full tank of gas.......This has worked for me a number of times..............
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Unread 03-15-2014, 05:42 PM   #25
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Start with the basics, tune the sucker up. New plugs, cap, rotor, wires, clean your throttle body out, new air filter, change your oil/filter, and make sure it's running at operating temp.

Seafoam will clean out your injectors but not the throttle body, the throttle body is before the injectors. Fit a new fuel filter too.

High octane gas will actually make it run worse, unless it's already in piss poor shape. The higher octane fuel won't burn as efficiently in a low PSI engine like the 4.0 and will probably increase your emissions slightly. Use the lowest octane possible.

If all of that fails, you may be looking at a new cat indeed..
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Unread 03-16-2014, 10:10 PM   #26
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Get the engine to operating temp. and introduce water into the brake booster line. This will vaporize and clean the combustion chamber most any carbon build up. Carbon build up will cause Nox levels to increase. Free and easy. But yeah, you will most likely need a cat at some point.
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Unread 03-18-2014, 11:46 AM   #27
langwilliams
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if anyone is wondering, i got it to pass. NOx standard is under 1047, i was at 1106. Ran some fuel injector/sea foam thru the tank. changed the plugs an wires. did the sea foam in the intake an let it sit a while. drove it hard an it smoked like a steam engine. went an got 4 gal of shell premium an put a bottle of heet in it. drove it some took it to the check station an it was 841. The tech said that is in standard but still a little high. I fig it'll need a cat for the next test, but who knows!

thanks for the tips
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Unread 03-18-2014, 10:07 PM   #28
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Quote:
Originally Posted by langwilliams
if anyone is wondering, i got it to pass. NOx standard is under 1047, i was at 1106. Ran some fuel injector/sea foam thru the tank. changed the plugs an wires. did the sea foam in the intake an let it sit a while. drove it hard an it smoked like a steam engine. went an got 4 gal of shell premium an put a bottle of heet in it. drove it some took it to the check station an it was 841. The tech said that is in standard but still a little high. I fig it'll need a cat for the next test, but who knows! thanks for the tips
The premium fuel and heet probably made it run a little high premium fuel burns slower so it does not run as clean as regular in our old workhorse engines.
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Unread 03-18-2014, 10:32 PM   #29
Jeep43
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Here in CA the max nox @ 15mph is 365. I failed at 659. After I changed my cat, plugs, and all filters I passed with a 1. The regulations are getting real strict every few years.
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Unread 03-19-2014, 04:29 PM   #30
langwilliams
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I lived in San Diego for a year while in the navy, I kept my truck registered an insured in Fla! Ohio isn't tightening standards that I know of, in fact on 5 or 7 counties still have to get checked an cars over 25 years old no longer require a check
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