98 Camry 2.2l .. P302, P303 misfire codes

[cnsheets]

Car started hesitating on acceleration and at idle then I started getting the P0300, P0302, P0303 codes.

Here is what I have tried thus far.

bottle of fuel injection cleaner..... problem continues
new spark plugs and wires..... problem continues
new 2/3 cyclinder ignition pack..... problem continues

Checked compression on each cylinder, each one at 180-182 lbs. So I do not think that I have any burnt valves or anything.

Fuel injectors perhaps?

I read somewhere where it states that cylinders 2,3 are more susceptible to fuel injectors getting clogged or going bad due to the excess heat causing more buildup from being in those locations, so I wonder if this could be it?

I am ready to pull the fuel rail and all 4 injectors, first to try and clean them, and plan to install the 2,3 injectors back into the 1,4 positions to see if I get the errors on those cylinders instead. If I do, then I am sure it is the injectors. If I get the same errors regardless of the injector position, then I am at a loss......

Where next? Sound like a good idea to pull the injectors and clean them and re-install?

Car was otherwise running great other than a few minor oil leaks, oh yeah, it also has 330,000 miles on it.

Thanks for the help. Appreciate it.

[cnsheets]

Anyone have any ideas or suggections other than the track I am on?

[ASG14]

Are the 2 cylinders not firing at all, or just really running bad?

[cnsheets]

Running bad. In park..seems that if I hold the engine RPM at about 2500 it runs rather smooth and the CEL goes out, but this is without load. With the car in drive and on accel its bad throughout....

After replacing the sparkplugs and running it again, I pulled the sparkplugs to check the compression on each cylinder. The spark plugs for the 2/3 cylinders looked "dry" in comparison to the 1/4 plugs. You could tell by looking at the plugs that it was definately sparking, just not sure if there is fuel to combust.... another reason I am thinking of the injectors being the problem. Just not sure why all of a sudden I would have 2 injectors fail or clog at once

[ASG14]

Any gas leaking? I know my friend 3VZ V6 all of a sudden started to misfire, and the cause was 2 of the gaskets went bad and started to leak fuel. At 330k mils, it can be almost anything, haha. But if kept it runnign this long, you must be taing really good care of it.

[cnsheets]

No apperent gas leaks, I have checked around all fuel lines, around all of the injectors etc. and do not see any wetness or anything..... other than a leak at the 2/3 injectors, I would think that any leaks anywhere else would affect all cylinders, not just those 2, but again, who knows.....

I was rather surprised to find the cylinder pressure as high as it was for having 330k miles on it.....

I am second owner,,,,,

[ASG14]

Check the voltage going to the injectors too. I know my mechanic was working on a Vette not long ago and some of the injectors were not getting enough voltage to work properly. Thats the only other thing I can think. I'm a lot better on the V6 engines then the I4's honestly.

I;m sure by the end of the day someone else will chime in with an idea.

[Eye8Pussies]

check for vacuum leaks

[cnsheets]

Thanks, I will double check the vacuum lines... I replaced all of the lines associated to the EGR system about 3 months ago when the EGR vacuum control valve went out, so i will check all remaining line as well.

[Mike Gerber]

"I am ready to pull the fuel rail and all 4 injectors, first to try and clean them, and plan to install the 2,3 injectors back into the 1,4 positions to see if I get the errors on those cylinders instead. If I do, then I am sure it is the injectors. If I get the same errors regardless of the injector position, then I am at a loss......"

That would have been my suggestion.

Congrats on reaching 330,000 miles.

Mike

[cnsheets]

Thanks on the congrats.... original engine other than the normal maintenance items like spark plugs, wires, etc... biggest thing replaced besides the brakes was an alternator.....until these recent problems

[Eye8Pussies]

don't just check the lines also check all the gaskets possible

if you can rev up the engine at idle and it will then be smooth without load, I would say that points to a fairly large vacuum leak somewhere.

spray lots of carb cleaner around to find the leak, or go to a shop and get a smoke test

[new echo owner]

Have you done a leak down test on #2 and #3 cylinder to see if the head gasket maybe having problem between the two cylinders? 2 and 3 cylinder on the same coil pack, how about the signal from the ECM?

N.E.O.

[Eye8Pussies]

^ ooo...very good suggestion as well

[1996camry]

Hi,

I would suggest you get a Toyota Manual and check your MAF sensor... MAF controls (open) how much airflow into your IAC... if you have not right amount of ratio mixing air and gas inflow into your engine, then you could get misfiring codes... Here is another link that I found other people have....hope this give you better feeling not waste $ on item you could potential think it's bad... I think you MAF sensor could be the your problem...but get a OHms meter and check and compare with TOyota spec.
http://www.obd-codes.com/forums/view...hp?f=1&p=15192