Hooked up computer to truck and read that cylinders 1&4 were mis firing.changed all 8 plugs and plug wires and check engine light reset.drove for about 20 miles and check engine light popped back up.truck feels like has ample power but dont want to go over 20-30 miles an hour or shift.sounds like a hissing sound coming from exhaust right by cat.converter.could converter be bad or plugged and causing engine to misfire?
Had the same codes on my truck. cat converter was plugged. I was told to take the cat off and gut it, then put it back on and it would run fine, but that didn't work. You need a new cat. Might want to replace the o2 sensors before and after the cat also. Hope this helps.
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Re: check engine light
Coil pack,,, vacuum leak are good suspects... it has always appeared to me that the check engine light is only for emmission items so consider those. i had a ford windstar van with check engine showing. turns out there are two small pipes that come off the exhast with hoses that go back to a sensor mounted on the engine.... one was broken off.... i fixed that without replacing the pipe $140 for a 12 inch pipe.
If you should find that it is a tube broken off let me know and i'll explain a quick repair.
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change, or have checked the plug wire itself, or the coil, an easy way to check the wire is with a volt meter,, check for ohms. put a test lead from the meter at each end of the plug wire itself. depending on length your reading may vary, so take the next wire with around the same length,, and check it too,, the readings should be about the same. the mechanic should have been able to do this step easily for you,
remove the plug from the #1 cylinder, and install it into the #2 cylinder , and put plug from # 2 clyinder in to #1 plug hole, connect plug wires, and start up vehichle, and if computer shows misfire on # 2 cylinder , then you have a bad plug, possibly porcelin insulator could have a hair line crack in it, hope that this information has helped you.
Cylinder 1 is not firing or is intermittently firing. Check the output on the coil associated with #1 cylinder by using a spare plug attached to #1 wire while engine is running. If it has good spark, check the fuel injector for possible problems. Crank shaft sensor would not be the problem as the engine has to have it to run. You may need to have it checked further at a reputable repair shop as this can get more involved than a back yard repair.
Replaced the MAF sensor - nothing. Took it to a authorized toyota shop & checked compression which check out good and put the computer on. Computer read mis-fire on cylinder 1, and then multiple misfire (like it would jump around). We went ahead and replaced the fuel injector on cylnder 1 - did not solve problem as when we hook the computer up, misfire seemed tp stay at idle and seem better when running high RMP, but check engine light is on as it never went away. Went ahead and replaced the coil pack to cylinder 1 - nothing. what am i missing?
This sounds as if you have a vacuum leak, check all the lines and check the intake. There are a lot of things that will cause mis fire. mis fire code is triggered when the ecm reads a very slight difference in the time the crank sensor picks up a signal. Mis fires can be from electrical, vacuum, mechanical, and eletronic sources. If you can get it to a person/shop that read which cylinder are misfiring this helps alot, narrows the field. Let me know I can help. Also it helps to know what engine we are dealing with
When a cylinder mis-fires there is a reason. The dealer should have told you that. Most likely you have a fouled out spark plug. Which means you need new spark plugs and maybe wires. All this would be covered in a standard tune up. Once the bad spark plug is replaced, the computer will quit registering a mis-fire. Please give good ratings, they meen a lot to us.... Thank you