Cheapest way to diagnose "All Cylinders Misfiring" when valve float suspected?
11-22-2011, 02:02 AM
#1
Cheapest way to diagnose "All Cylinders Misfiring" when valve float suspected?
6MT with ~104k miles.
This has been going on since ~96k miles. I've posted about this before, but my car is at the dealer now, and I had the chance to talk to one of their team leaders techs, so I'm thinking about doing something about this again.
Code reader reports misfire in all cylinders and random misfire.
I have accidentally upshifted into 1st instead of 3rd before.
Idle is a little rough.
CEL flashes often at idle (less often when it's hot outside).
Startup sounds a little odd (cranking is not smooth sounding).
MPG has not changed noticeably.
I haven't noticed any loss of power.
No change after spark plugs replaced.
I've looked at several cylinder misfire threads, and I'm almost positive my exhaust valves are bent. I talked to a team leader tech at my local Acura dealer (he's been there 20 years), and he said that he could use a feeler gauge to determine if there is an unusually large gap at the valves. This will cost $400 to check.
I was originally going to have a compression test done and then a leak-down test, but the dealer wants 2 hours for each at $133/hour.
What's the least expensive method to use for confirming valve damage? I was thinking about pulling one of the valve covers off to feel a few of the valves myself with a feeler. I wish I could look inside the cylinders through the spark plug opening to see if there are any marks on the pistons from hitting the valves.
If it is confirmed that the valves need to be replaced, do you think it would be ok to let Firestone remove and reinstall the heads once a machine shop has replaced the damaged valves? I'm always worried that someone might forget to plug something back in. The dealer's not an option because they want $4000 for the job.
The other alternative is to do nothing and save ~$2000. Any potential long term damage possible? I'm thinking it's only a small amount of unburned fuel leaving the combustion chamber at idle. I wonder if it can pass the emissions inspection with those CEL codes in the system.
This is the only thing keeping me from fully enjoying my TL at this moment. Thanks in advance.
This has been going on since ~96k miles. I've posted about this before, but my car is at the dealer now, and I had the chance to talk to one of their team leaders techs, so I'm thinking about doing something about this again.
Code reader reports misfire in all cylinders and random misfire.
I have accidentally upshifted into 1st instead of 3rd before.
Idle is a little rough.
CEL flashes often at idle (less often when it's hot outside).
Startup sounds a little odd (cranking is not smooth sounding).
MPG has not changed noticeably.
I haven't noticed any loss of power.
No change after spark plugs replaced.
I've looked at several cylinder misfire threads, and I'm almost positive my exhaust valves are bent. I talked to a team leader tech at my local Acura dealer (he's been there 20 years), and he said that he could use a feeler gauge to determine if there is an unusually large gap at the valves. This will cost $400 to check.
I was originally going to have a compression test done and then a leak-down test, but the dealer wants 2 hours for each at $133/hour.
What's the least expensive method to use for confirming valve damage? I was thinking about pulling one of the valve covers off to feel a few of the valves myself with a feeler. I wish I could look inside the cylinders through the spark plug opening to see if there are any marks on the pistons from hitting the valves.
If it is confirmed that the valves need to be replaced, do you think it would be ok to let Firestone remove and reinstall the heads once a machine shop has replaced the damaged valves? I'm always worried that someone might forget to plug something back in. The dealer's not an option because they want $4000 for the job.
The other alternative is to do nothing and save ~$2000. Any potential long term damage possible? I'm thinking it's only a small amount of unburned fuel leaving the combustion chamber at idle. I wonder if it can pass the emissions inspection with those CEL codes in the system.
This is the only thing keeping me from fully enjoying my TL at this moment. Thanks in advance.
11-22-2011, 09:03 AM
#2
6MT with ~104k miles.
This has been going on since ~96k miles. I've posted about this before, but my car is at the dealer now, and I had the chance to talk to one of their team leaders techs, so I'm thinking about doing something about this again.
Code reader reports misfire in all cylinders and random misfire.
I have accidentally upshifted into 1st instead of 3rd before.
Idle is a little rough.
CEL flashes often at idle (less often when it's hot outside).
Startup sounds a little odd (cranking is not smooth sounding).
MPG has not changed noticeably.
I haven't noticed any loss of power.
No change after spark plugs replaced.
I've looked at several cylinder misfire threads, and I'm almost positive my exhaust valves are bent. I talked to a team leader tech at my local Acura dealer (he's been there 20 years), and he said that he could use a feeler gauge to determine if there is an unusually large gap at the valves. This will cost $400 to check.
I was originally going to have a compression test done and then a leak-down test, but the dealer wants 2 hours for each at $133/hour.
What's the least expensive method to use for confirming valve damage? I was thinking about pulling one of the valve covers off to feel a few of the valves myself with a feeler. I wish I could look inside the cylinders through the spark plug opening to see if there are any marks on the pistons from hitting the valves.
If it is confirmed that the valves need to be replaced, do you think it would be ok to let Firestone remove and reinstall the heads once a machine shop has replaced the damaged valves? I'm always worried that someone might forget to plug something back in. The dealer's not an option because they want $4000 for the job.
The other alternative is to do nothing and save ~$2000. Any potential long term damage possible? I'm thinking it's only a small amount of unburned fuel leaving the combustion chamber at idle. I wonder if it can pass the emissions inspection with those CEL codes in the system.
This is the only thing keeping me from fully enjoying my TL at this moment. Thanks in advance.
This has been going on since ~96k miles. I've posted about this before, but my car is at the dealer now, and I had the chance to talk to one of their team leaders techs, so I'm thinking about doing something about this again.
Code reader reports misfire in all cylinders and random misfire.
I have accidentally upshifted into 1st instead of 3rd before.
Idle is a little rough.
CEL flashes often at idle (less often when it's hot outside).
Startup sounds a little odd (cranking is not smooth sounding).
MPG has not changed noticeably.
I haven't noticed any loss of power.
No change after spark plugs replaced.
I've looked at several cylinder misfire threads, and I'm almost positive my exhaust valves are bent. I talked to a team leader tech at my local Acura dealer (he's been there 20 years), and he said that he could use a feeler gauge to determine if there is an unusually large gap at the valves. This will cost $400 to check.
I was originally going to have a compression test done and then a leak-down test, but the dealer wants 2 hours for each at $133/hour.
What's the least expensive method to use for confirming valve damage? I was thinking about pulling one of the valve covers off to feel a few of the valves myself with a feeler. I wish I could look inside the cylinders through the spark plug opening to see if there are any marks on the pistons from hitting the valves.
If it is confirmed that the valves need to be replaced, do you think it would be ok to let Firestone remove and reinstall the heads once a machine shop has replaced the damaged valves? I'm always worried that someone might forget to plug something back in. The dealer's not an option because they want $4000 for the job.
The other alternative is to do nothing and save ~$2000. Any potential long term damage possible? I'm thinking it's only a small amount of unburned fuel leaving the combustion chamber at idle. I wonder if it can pass the emissions inspection with those CEL codes in the system.
This is the only thing keeping me from fully enjoying my TL at this moment. Thanks in advance.
as far as "Checking" valve clearance, you might as well do a valve adjustment at a reputable shop for same or less. They will tell you if there is any excessive clearance and will correct it. Just my
11-22-2011, 02:57 PM
#4
Suzuka Master
Doesnt sound like there is really any question other than how many cylinders/valves are bent. compression and leak down if necessary. You already know the cause, just not the quantity.
11-23-2011, 11:33 AM
#5
the overexplainer
Wait, did I read "Firestone" as in the tire shop?
Find a japanese specialist to work on the car.
www.yelp.com if you have no idea of any. Not 100% reliable but a good place to start.
Find a japanese specialist to work on the car.
www.yelp.com if you have no idea of any. Not 100% reliable but a good place to start.
Thread
Thread Starter
Forum
Replies
Last Post
rp_guy
Member Cars for Sale
9
07-16-2017 07:33 AM
