Question about 1994 Jeep Wrangler

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I want to increase power in my Strait 6 4.0

I am currently looking at replacing my air intake and exhaust system. Is there any avice on what headers and what diameter piping to use also what should i be aware of about back pressure i don't whant to burn a valve. currently I am running 33X12.50/15 tires and it has enough power but i would like a little more up in the mountains. I have installed a throttle spacer and recieved a little more power out of it but i need more.

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You are correct in replacing both intake & exhaust (you can't put in what you can't get out. "headers" are rpm sensitive, as they scavenge
by using both a moving "slug" of exhaust as well as resonant frequencies. Many manufacturers offer "matched sets" (intake & exhaust for this reason. On a "utility vehicle" such as a Jeep, you must always keep rpm range in mind, using items designed for "mid range" of 1500-2500rpms as a base.The easiest way to get more hp is by doing intake, exhaust and a mild "rv" type camshaft. More expensive is to use a turbocharger (but has limited value at lower rpms) Superchargers offer "off the line power" but are very expensive, unreliable and difficult to get "tuned" properly. An aftermarket "tunable" ignition system is also another option I'd look into. It's another way of changing the engines power curve.Or, how about just changing final drive gear ratios? Don't forget though that most power gains also equal less mpg's.

Posted on Jan 24, 2009

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Eng light on


Also - check the vacuum hoses under the battery for corrosion.

P0410 indicates an A.I.R. system malfunction per the title of your post. Specifically it means the PCM determined the heated O2 sensors voltages did not respond within the allotted time. They have to fall below 222 mV in < 1.3 seconds on both banks during closed loop operation. Or the short term fuel trim did not change more than a predetermined amount.

The above will cause the Malfunction Indicator Lamp (MIL) to come on. If after 3 consecutive ignition cycles where the diagnostic runs and passes it will go out.

Possible causes:

-Low system air flow
-Excessive exhaust system back pressure
-Moisture, water or debris ingested into the AIR pump
-Pinched, kinked, heat damaged, or deteriorated hoses or vacuum lines
-Restrictions in the pump inlet, duct, or filter

The car will run fine with the system inoperative. It only runs during startup to help the CATs light off faster. It does this by injecting air into the exhaust.

The pump is located inside the front fascia on the drivers side. You'll find its intake connected to the engines air intake. It's a small squarish box. The plumbing goes into each header. (The small tubes that come off the headers) There are also two check valves the prevent exhaust gasses from entering the AIR system plumbing. They are located next to those connections on the headers where the AIR plumbing attaches. If one of them goes bad you will get a P1415 or P1416 code. (Fairly common with aftermarket headers).

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