Many noises...

jeepkj02 · **Posted:** Sat Dec 01, 2007 5:28 pm

I'm having some issues with my KJ. My check engine light is on, with the P0442 code. I change the gas cap and plugs (cylinder 6 had fuel on the ignition coil side).

I hear a chirping noise coming from the engine bay only when cruising and accelerating. It goes away when idling.

Performance is lacking. Very difficult to bring it past 2000 RPM, without shaking and making noise. I've been getting some bad mileage around 13 city/15 hwy.

Past 50 mph my exhaust is making some horrible noise, when accelerating. When cruising it goes away. I thought it was the muffler because it was seriously rusted and dented. I did replace it and it helped and sounds awesome @ 1500-2000 rpms (I'll post a sound clip tomorrow or monday), but the noise is still there at 2300-2500 rpms @ 50 mph+.

I can't go past 70 mph without the car shaking. People don't like it when you drive 60-65 on the interstate (in Michigan).

The engine oil filler valve had yellow residue.

Any ideas???

chefdab · **Posted:** Sat Dec 01, 2007 7:00 pm

How many miles you got on it?

jeepkj02 · **Posted:** Sat Dec 01, 2007 7:09 pm

75,680 miles.

Recent maintenance:

PCV Valve: 67,500
Antifreeze/Radiator hoses: 75,600
Motor Oil/Filter: 73,700 (Mobil 1 and Purolator ONE)
Serp. Belt: 65,500 (snapped off on the interstate)
Tire Rotation: 73,600
Spark Plugs: 75,200 (AutoLite Platinums)
Alignment: 73,600
Air Filter (Cleaned/Oiled): 73,200
PS Fluid: 71,100
Tranny Fluid/Filter: 62,200
Frt/Rear Diff Lube: 67,500
Muffler: 75,680 - Today!

Guest · **Posted:** Sat Dec 01, 2007 7:48 pm

is it using coolant? could be a bad head gasket(s)...could be a LOT of things.

jeepkj02 · **Posted:** Sat Dec 01, 2007 7:56 pm

ThunderbirdJunkie wrote:

is it using coolant? could be a bad head gasket(s)...could be a LOT of things.

Coolant level is normal. Shouldn't there be another code if there was a much more serious problem like a blown head gasket.

Jeepjeepster · **Posted:** Sat Dec 01, 2007 9:27 pm

Did it start soon after you changed the spark plugs? Sounds like youre down a cylinder.

Check to make sure you dont have any other codes.

P0442-Evaporative Emission Control System Leak Detected (medium leak)

That shouldnt cause whats going on though.

tjkj2002 · **Posted:** Sat Dec 01, 2007 9:38 pm

Fuel filter or bad coil/plug

For the code you most likely have a cracked hose on the evap canister in front of the gas tank,or a bad test pump,or a leaky evap solinoid(by the battery,green cap).

jeepkj02 · **Posted:** Sat Dec 01, 2007 9:52 pm

Jeepjeepster wrote:

Did it start soon after you changed the spark plugs? Sounds like youre down a cylinder.

Check to make sure you dont have any other codes.

P0442-Evaporative Emission Control System Leak Detected (medium leak)

That shouldnt cause whats going on though.

I changed the plugs because of that code. All of them were find except the last cylinder. Passenger side by coolant tank. The tip (ignition coil side) had some burn marks/fuel? as did the coil itself. Hopefully there is nothing too serious!

tjkj2002 wrote:

Fuel filter or bad coil/plug

For the code you most likely have a cracked hose on the evap canister in front of the gas tank,or a bad test pump,or a leaky evap solinoid(by the battery,green cap).

I did have a P1494 or 1495, don't remember (Leak Detection Pump). But that went away few months ago. Checked all the hoses, looked fine.

Guest · **Posted:** Sun Dec 02, 2007 9:58 am

If there are burn marks on the coil and the plug, that'd tell me to change the coil

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