Changing from 10w-30 to 10w-40 should not harm the engine. I think you need to look elsewhere for your problem. Do you have a check engine light on?

I'm assuming you want to remove the one on the Manifold side right?

There are i think 5 bolts (circular pattern) on the top and 2 or 3 bolts at the bottom, just disconnect all of them, also disconnect the o2 sensor, then install the new one, don;t forget to buy gaskets as well.

To have more idea on how to replace your catalytic converter just click this site http://www.automd.com/.../ you will find there a step by step guide on how to replace your catalytic converter and what tools are needed to do it. You will also see there the tools that are needed to do it and the estimated cost if you Do-It-Yourself and if you will take it to a service shop.

Code P0320 is "Ignition/Dist Engine Speed Input Circuit Malfunction"

Replace the ignition failure sensor. The ignition failure sensor has 4 wires and is located near the back of the engine close to the coils.

You are describing the symptoms of a major vacuum leak. Inspect intake/induction tract for leaks/damage.

It sounds like you have a clogged catalytic converter. The increased exhaust back-pressure will set the misfire codes and the MAF P)101 code as well - other codes as well. When the engine is overnite cold, remove the forward most oxygen sensor temporarily for a road test and see if the problem seems gone. Replace the front catalytic converter if the acceleration comes back with the O2 removed.

Timing belt replacement is done by a DIY while reading the steps and seeing the pictures in a shop manual, it is not information we have at AutoMD to post for you. You absolutely cannot consider a T-Belt replacement with having a manual in front of you while doing it.

Hey John,
When you say it connects the power steering pump, are you referring to the serpentine belt and not the timing belt?

On the throttle body. its usually where the air intake tube from the air filter and the intake manifold meet.

your having a bad ECU

there are a multiple possible causes that can give this erratic idle and fluxuation 1. idle air control valve 2. mass air flow sensor. 3 air being taken in after mass air flow sensor so its not being messured by the computer with this type of issue a check engine light is on in most cases. by having the a/c on there is more of a load on the engine so the problem your having will be multiplied by the load < the a/c is not the cause > vacuum leaks will also be a source of this condition . has the car been in for an oil change were they may have disturbed the air filter box by checking its condition.

I absolutely do not understand the 8 degree setting. Where did you get that? There are marks on the crankshaft gear that align with the mark on the timing cover behind the crankshaft gear. These marks are at TDC which is -0- not 8 degrees. The P0016 is a fault code relating to the valve timing being wrong. I believe that your are misaligned. Redo the T-belt again.

Left rear of engine compartment, on the transmission bell housing.

Did you think that the A/C would work without the engine running? It will not.

Typically, if the cam sensor were bad, there would be a fault code P0342 stored so if you do have that code, I would just replace the sensor, if you have a different code then skip the cam sensor and focus on the code title. Here is a flow chart for a code P0342 diagnostic >>

There is a code P0342 stored in the system. It does not want to start and when it does it runs poor.
Tests/Procedures: 1. At the cam position sensor check for 12 volts to be present on the Pink wire.
Check the Black wire for a good ground and then check the Yellow wire for a good square wave signal when cranking.

2. Check the engine mechanical condition of the engine. Check the valve timing for being correct.
Potential Causes: Camshaft Position Sensor (CMP)
Engine Mechanical

Tech Tips: This code can set if the cam timing has jumped and it can also set if the cam sensor is faulty.
Diagnostic Codes: P0342

Try cleaning the mass air flow sensor with the proper aerosol cleaner and then erase the code and see if it returns. Mass air flow sensors can also fail where cleaning them will not help but often iot solves things like a lean code.

Check the starter.