Hello Team Honda !

so ive been getting Misfire on all cylinders. Im also getting a Cat-converter code .

I brought the car into a shop and they said i have a bad Cat as well as a bad seal (exhaust valve ) on cyl 3.

options are to get head work for $1500-$2000 car has 175k

or replace engine with one that has 75k for $700 plus labor.

now what im thinking, because i dont have that much money right now foreither option, is to replace the cat and then shut down fuel and spark to cyl 3.

im not sure how to do this. what do you guys think. is this a good idea for now. i dont want to mess up the good cylinder.

the compression on cyl 3 was 95. the rest are good.

thanks in advance for your help

 

also is shutting down a cylinder bad for your engine ? and where is the best place to shut it down. I was thinking the power supply going to the injector on 3 cyl

 

On these cars it is. If you remove the spark/fuel the engine will still mechanically pump air in that cylinder. This air will be pumped into the exhaust, the O2 sensor will read this pumped air, recalculate the A/F ratio and add more fuel, causing a rich condition.

Best bet would be to have the original problem with the engine fixed. Then if the catalyst was indeed damaged, have it replaced. Just because a code is tripped does not mean that the component itself has failed, just that it appears to have fallen out of expected parameters, and should be checked.

 

Awfully expensive for a valve job. Machine shops here charge $250 for the head work alone. Add six hours R&R labor and another $150 for a head gasket set. Even @ $100/hour shop labor rate the total would be right around $1000. Shop around. 175K miles isn't that much.

 

thanks for the reviews, any other feedback ?

 

also if you do replace the cat, keep your oem one, they are worth money. alot of shopd well tell you you need your cat replaced. then keep your old one and sell it for a profit.

i get a second option on both issues. bring it to somone who knows hondas and dont any anything about what the first shop said. if the valve seal is indeed gone you might be better off spending the money on a jdm h22 conversion or something along those lines.

 

GL lol

 

Yeah, youre a tard. "shut down a cylinder" LoL. Madmike covered the rest.

 

Dude, go smoke some Pen15.

For everyone else who was helpful, thanks !

 

I replaced the cat converter. The car is running much better. The check engine light has not gone off in 3 days for misfire or cat. just a heads up.

 

Keep your eye on it. What may have happened is there was an exhaust leak, causing a lean misfire. Replacing the catalyst may have fixed the leak and lean misfire issue which in turn would fix the problem.

What were the codes, you didn't post the actual code numbers outside of 'misfire' and 'bad catalyst code'. BTW you didn't mention the year or model of your car.

Were any of these codes mentioned?

P0300 — Random Misfire
P0301 71 Misfire Cyl. 1 Or Random Misfire
P0302 72 Misfire Cyl. 2 Or Random Misfire
P0303 73 Misfire Cyl. 3 Or Random Misfire
P0304 74 Misfire Cyl. 4 Or Random Misfire
P0305 75 Misfire Cyl. 5 Or Random Misfire
P0306 76 Misfire Cyl. 6 Or Random Misfire
P0420 67 Catalyst System Efficiency Below Threshold

 

2000 Honda accourd ex 4cyl 2.3

I believe the misfire codes were the

P0303 73 Misfire Cyl. 3 Or Random Misfire
P0304 74 Misfire Cyl. 4 Or Random Misfire

thanks for the feedback mad