All four cylinders misfiring with and o2 code?

Question

I have a 2000 chevy s-10 that was running very poorly. When I was driving the engine started reving so I pulled over and had my brother come look at it. He didb't figure out what was wrong with it, but drove it back to my house since we were close and it would only go about 15 mph before it would start reving. After getting it home and parking I got in to get it closer to the curb and the check engine light came on. I took it to an old frined of mine who owns a shop, and so far he has told me that all four cylinders are misfiring and that he is getting and o2 code. He hasn't had much time to play with it and I told him to take his time, since I won't have the money to get it for a couple of weeks anyway. Has anyone else had something similar to this happen to them, I am curious as to what the problem is and how much it will end up costing (round abouts anyway on the cost). To help narrow it down he said it was not the cat and I have good compression. Timong Belt replaced in March 05

Thought I should add that I just had new plugs and wires done in June of this year, and he said he checked the Catylac convertor and that is not the problem.

Answer 1

could be the Throttle Position Sensor in the side of the throttle body assembly

Answer 2

If you are getting an o2 sensor code, you can start there. Chances are, replacement of the o2 will solve this problem. However, there may be a chance that you have a vacuum leak. This can cause a misfire of all the cylinders because of a too-lean system. The o2 sensor tries to compensate richening up the motor but, its out of its limitations. Start with the vacuum hose going to the brake booster. If you take a can of WD40 and spray it slowly along your vacuum hoses, you can find a leak when the engine changes speed all of a sudden.

Answer 3

O2 sensor wont cause a miss, it will just hurt the air fuel mixture and reduce gas milage. coverter wont cause this problem either. not sure what your reving problem might be, can't figure out how that can happen with it in gear going down the road. if you paid for a timing belt replacement you got suckered, you have a chain.

Answer 4

o2 sensor codes are common for vehicles with serious problems if the mixture is too lean or too rich... Probably set too rich codes due to the misfiring.

Could be a number of things but my guess is it is common to all cylinders (too high or too little fuel pressure), or a coil could be going out

But forget the o2 sensor untill it's running right

Answer 5

sounds like its your ignition module. mounts under your coil packs. and since you only have 1 code saying o2 which is commen for a vehicle misfiring i would try that because you wont get a code for it, hope that helps

Answer 6

needs
new spark plugs
new catallytic converter
new O2 sensors.

and thats roughly $500-1000 in parts(depending on where your located).(cats are not cheap..nor are O2 sensors)

Answer 7

ptruelove01 has the right idea, but i'd go with carb cleaner rather than WD-40 because carb cleaner leaves no residue, wd40 would stay on everything you spray it on and is bad for the rubber hoses!

Answer 8

move the spark plugs around or twist the distributor a little left or right until you get a normal running sound