i have a 2004 acura tl sometimes while coming to a stop car feels like it misfire and shut off.even at idle it misfire it also has no code stored.any info will help

 

anybody has any info

 

it'd be nice if we got a little more info from you other than the year of your car and a vague description of the problem.."feels like a misfire" is very vague. also shuts off? sounds like an idle issue.

Miles? what kind of work has been done recently? Tune up? Timing belt? Spark plugs last changed when?

 

Adding to this, maybe a coil pack went bad?

 

Coilpack

 

ok im sorry heres what i done throttle body,o2 sensors,spark plugs,motor has 220,000 miles when i start the car it misses i put in drive idles low and shut off sometimes i check coil packs there fine i also noticed that my rpm needle jump up and down when driving

 

what did you do with/to the throttle body?

 

and did you do this work before it started acting funny or after it started acting funny?


basically, we dont know what you did before and after it started acting funny...

is it 6mt or 5 automatic?

 

changed it because i thought that was the problem

 

jeez i feel like sherlock holmes trying to help OP here.


Dump the car OP, buy a new one.

 

It's 5 automatic

 

okay, so....did the car ALWAYS have this problem?

or did it just start?

 

Bought it like that from a guy he told me it was 02 sensor which was code showing replaced them still misfiring

 

now, we're getting somewhere!


hook up an OBDII reader to see if it throws codes once you connect it

 

plugged cat? but yeah, take it to any autoparts store and get the codes read for free, then come back and post.

p.s. has the 2nd 105K service been done?

 

CA no longer allows parts stores to scan codes so OP may be SOL on that front, get a code reader from a friend/buy one and scan.

When you said you checked coil pack, how did you check exactly? By looking at it? Before going into things down stream like the cat, etc. I'd start from the top with coil packs and spark plugs. "Checking them" and "seem fine" aren't very helpful when we're trying to help you remotely. Something like "I got a new coil pack and put it into each cylinder one at a time to try to rule out a bad coil pack" is more helpful.


Waiting for your reply.

 

check it with my code reader no codes as for coil packs i unplugged each one and noticed idle change and after got cylinder misfire cleared them still same

 

what does this mean?

 

after checking coil packs the code come up for cylinder misfire but i cleared it

 

Here's the thing though: clearing the code doesn't fix the problem! Did you maybe not plug it in all the way and thus causing the misfire.

 

what was the code?

 

I think what he is saying is: With the car running he would unplug a coil pack and listen for the idle change / that cylinder didn't fire. So then the car would throw a misfire code on that cylinder. He would clear that code and move onto the next coil pack/cylinder. All six cylinders / coil packs produced the misfire code when he unplugged them verifying that all six coil packs are working.

 

OK, that makes sense if that's what the OP meant.

So, OP: The only time you get a code is when you pull a coil pack?

So if you're not getting codes any other time, then it's not misfiring.

What were the 02 codes when they happened?

What brand of 02 sensors did you use and exactly which 02 sensors did you replace?

Did you use NGK 6994 spark plugs?

Have you checked the voltage on sensor 2 (bottom) of each cat with your obd scanner? It should be steady ~ 0.5v +/- 0.2V

How about cat temps? Have you monitored them with the tool?

 

exactly but i still have a misfire. thank you

 

OP, we posted on top of each other. Can you answer my questions in post #23?

 

no codes are showing

 

If it's misfiring, it'll throw a code.

Have you checked all the spark plugs conditions?

also nfn asked above about the 2nd timing belt job, has it been done yet?

 

yes timing belt was done one other thing i notice when driving rpm needle bounces up and down

 

Okay I think I know a problem: If we ask two questions in one post, you'll forget it so I'll list them one at a time

 

Could also be the coolant was not burped correctly when re installed from at the second 105k service? That brings a bouncing needle and almost stall.

 

Ok update came home replaced all spark plugs still same problem

 

Ok here's update number 2 gutted all the cats still I'm having same issue ,rpm bouncing around

 

No clue if this will help but undo the battery and let it sit for 30 minutes. reconnect it and turn the car on so it's drawing on the battery ONLY. Turn off the radio, lights, a/c, etc. Turn the car off, and then completely ON. Let the car idle for 10 or so minutes, this is the idle relearn procedure.

Also check your fuel pressure and see if it is in spec

I've also heard that if your valves need to be adjusted, you can get a misfire. I don't know if it would cause your problem, but whens the last time you got the valves adjusted?

 

Ok tried relearn process did not help but I notice my positive cable has acid build up inside wire I'm ordering new cables see if that helps

 

instead of throwing parts at it; why not trouble shoot to figure out the problem....

when you tell us its misfiring, HOW DO YOU KNOW that it's misfiring?

 

if you keep throwing parts at it; HOPING that it will fix it, you may never fix it.

 

this is whats happening when i start the car it idles fine then like a minute or two idle stumbles like its misfiring and car shut off. sometimes happens also when i put in drive or reverse ill have to give it gas. but when i drive it runs fine

 

If you gutted your cats, you should now be getting a MIL.....

 

have a leak down test and have compression tested.

these two test will let you know if compression is being lost.

then, instead of throwing parts at it, you will know the problem and can address the problem.


stop throwing parts at it.