misfires like everyone else...
#1
misfires like everyone else...
ok so my friends tl has misfire codes on.. it was cylinders 2 3 5 6. so we changes the coils for them and all 6 plugs. everything from factory. the engine light came back on with cylinder 2 misfire and the code p1399. that random misfire code. so wut now should i change the rest of the coils that i didn't change?
#2
I have the same problem......... It comes on wen it feels like it....... Right now it hasn't came on for a week(used to come on every morning). I cleaned the egr valves and tb.... Also make sure the oil level is right because low oil causes random missfire... It it comes on again i'll change all the plugs and coils.
#4
You might have wanted to try cleaning the carbon out of the system first before buying new coils.
Try a seafoam treatment. Big thread in main TL area has all the info needed.
I had misfires and the dealer was about to change out all the fuel injectors, but under pressure from the warranty company, they found that it was just carbon.
Try a seafoam treatment. Big thread in main TL area has all the info needed.
I had misfires and the dealer was about to change out all the fuel injectors, but under pressure from the warranty company, they found that it was just carbon.
#5
Originally Posted by Anachostic
You might have wanted to try cleaning the carbon out of the system first before buying new coils.
Try a seafoam treatment. Big thread in main TL area has all the info needed.
I had misfires and the dealer was about to change out all the fuel injectors, but under pressure from the warranty company, they found that it was just carbon.
Try a seafoam treatment. Big thread in main TL area has all the info needed.
I had misfires and the dealer was about to change out all the fuel injectors, but under pressure from the warranty company, they found that it was just carbon.
#6
From what I've read, getting a CEL after a treatment usually means the carbon burning off is fouling the O2 sensor. Usually that clears itself after a bit of driving. It might be a clue though. Will a failing o2 sensor cause misfires? I thought it was more for air mixture.
When my car was at the dealer to fix my misfires, they said they took off the plenum (they said "plentum", but I'm pretty sure that was a typo) and cleaned the carbon out. I don't know where this is or how to do it. Maybe someone else can elaborate.
When my car was at the dealer to fix my misfires, they said they took off the plenum (they said "plentum", but I'm pretty sure that was a typo) and cleaned the carbon out. I don't know where this is or how to do it. Maybe someone else can elaborate.
#7
Senior Moderator
Yes, 02s will cause the code, ive seen it on my car and there have been others.
The plenum they talked about is the Upper Intake Manifold. Cleaning it has been discussed and there is DIYs in the DIY thread. Just look for EGR cleaning.
The plenum they talked about is the Upper Intake Manifold. Cleaning it has been discussed and there is DIYs in the DIY thread. Just look for EGR cleaning.
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#8
Originally Posted by fsttyms1
Yes, 02s will cause the code, ive seen it on my car and there have been others.
The plenum they talked about is the Upper Intake Manifold. Cleaning it has been discussed and there is DIYs in the DIY thread. Just look for EGR cleaning.
The plenum they talked about is the Upper Intake Manifold. Cleaning it has been discussed and there is DIYs in the DIY thread. Just look for EGR cleaning.
#9
sooo i should seafoam the engine, clean the egr ports, clean the o2 sensors... and i should put back the old sparkplugs before i seafoam. btw how many o2 sensors does this car have? 2 or 4? cuz i know some v6 have 4.. 2 primary and 2 secondary..
#11
Senior Moderator
Originally Posted by oodemonboioo
sooo i should seafoam the engine, clean the egr ports, clean the o2 sensors... and i should put back the old sparkplugs before i seafoam. btw how many o2 sensors does this car have? 2 or 4? cuz i know some v6 have 4.. 2 primary and 2 secondary..
#12
Senior Moderator
Originally Posted by Soseductivesf
What I don't get is it a random thing..... 2 weeks it would drive fine no codes then the next week every morning boom all the lights(check engine/VSA's) would come on. It would still perform the same(no noticable loss in performance).... The dealer says lets pull the engine apart (a my expense of at least 2k in labor)and maybe a bent valve or something but that should be hard evidence and the CEL should come on every time right? I've been checkin up on my oil level and keeping it level and so far no CEL's.......Also sometimes I get rough starts it would take a couple of seconds to start........
Oil level doesnt have any thing to do with it.
#13
i heard somewhere on this form that seafoaming the engine messes up the o2 sensors or something. tahts y we have to clean up but i guess i read wrong. maybe i was too tired or something i'll take your word for it.. were just gonna clear the egr port first. he also has a ripped motor mount passenger side.. probably from the engine shaking very weirdly..
#14
Originally Posted by fsttyms1
Honestly. It could be any number of things. It could be the motor needs work (ie a bent valve, low compression on a cyl) it could be the ECU, it could be wiring, could be a O2 sensor.
Oil level doesnt have any thing to do with it.
Oil level doesnt have any thing to do with it.
#16
A heavy dose of seafoam at 2oz per 1 gallon gas or 1 can in 1/4 tank of gas, will clean the injectors like magic. Always try that, and a can in the intake vac line when dealing with misses.
The EGR port gets carbony buildup really bad and the tiny holes need to be cleaned out.
See the DIY section for Thermoblock spacer install w/ EGR cleaning
Do not put old plugs in! If they are recent the seafoam wont hurt them at all, and doing the all important burn off drive afterwards cuts down on the CEL and other wierdness
The EGR port gets carbony buildup really bad and the tiny holes need to be cleaned out.
See the DIY section for Thermoblock spacer install w/ EGR cleaning
Do not put old plugs in! If they are recent the seafoam wont hurt them at all, and doing the all important burn off drive afterwards cuts down on the CEL and other wierdness
#17
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I had a similar problem w/ cyl 4, 5, and 6 misfire. I had the luxury of having a scan tool and the misfire was happening during idleing when engine cold. First I rotated spark plugs and coils, but that didn't fix it.
Then I took a guess on the egr valve being cracked open a bit during idle (supposed to be closed) and replaced it. While I was in there sprayed some TB cleaner in the egr port, clean the TB, and IACV. So far no CEL for about a week now.
Then I took a guess on the egr valve being cracked open a bit during idle (supposed to be closed) and replaced it. While I was in there sprayed some TB cleaner in the egr port, clean the TB, and IACV. So far no CEL for about a week now.
#18
Originally Posted by Junior05
It's really annoying because it happens so randomly. If it were a bent valve or something, it should ALWAYS happen. I'm starting with all the spark plugs, then coils. EGR/throttlebody have been cleaned.... valves adjusted 15k ago, CAI cleaned and reoiled. Can anyone thing of anything else? Sensors that would throw a missfire code (o2 would throw an o2 code but maybe MAP sensor or crank sensor?) Also I had someone clean the throttlebody when I had the Plenium spacer installed. Is that the same thing as cleaning the IVAC? I tried to search it but found no D.I.Y's for it........
#19
Originally Posted by silver2003tl
I had a similar problem w/ cyl 4, 5, and 6 misfire. I had the luxury of having a scan tool and the misfire was happening during idleing when engine cold. First I rotated spark plugs and coils, but that didn't fix it.
Then I took a guess on the egr valve being cracked open a bit during idle (supposed to be closed) and replaced it. While I was in there sprayed some TB cleaner in the egr port, clean the TB, and IACV. So far no CEL for about a week now.
Then I took a guess on the egr valve being cracked open a bit during idle (supposed to be closed) and replaced it. While I was in there sprayed some TB cleaner in the egr port, clean the TB, and IACV. So far no CEL for about a week now.
#20
Senior Moderator
Originally Posted by Junior05
It's really annoying because it happens so randomly. If it were a bent valve or something, it should ALWAYS happen. I'm starting with all the spark plugs, then coils. EGR/throttlebody have been cleaned.... valves adjusted 15k ago, CAI cleaned and reoiled. Can anyone thing of anything else? Sensors that would throw a missfire code (o2 would throw an o2 code but maybe MAP sensor or crank sensor?) Also I had someone clean the throttlebody when I had the Plenium spacer installed. Is that the same thing as cleaning the IVAC? I tried to search it but found no D.I.Y's for it........
#21
Taking the EGR off and spraying cleaner in was a quick cleaning but not a total cleaning of the ports that get clogged in the first place.
The only way to get them totally is remove the intake manifold and spray spray spray. Acura method places manifold in a solvent tank, running thru each opening of the manifold to get it spotless again.
Check the DIY- Installed Thermoblock spacer and EGR cleaning
The IAC Idle Air Control is attached to the Throttle Body assembly- when thats off, you flip it over and see the screws. Clean it with carb spray-throttle body cleaner
Dont buy the Denso PLugs- what a $$ ripoff
NGK Iridium IX or NGK Platinum if thats what they have- 7 bucks each, and outlast outplay outwit the denso
The only way to get them totally is remove the intake manifold and spray spray spray. Acura method places manifold in a solvent tank, running thru each opening of the manifold to get it spotless again.
Check the DIY- Installed Thermoblock spacer and EGR cleaning
The IAC Idle Air Control is attached to the Throttle Body assembly- when thats off, you flip it over and see the screws. Clean it with carb spray-throttle body cleaner
Dont buy the Denso PLugs- what a $$ ripoff
NGK Iridium IX or NGK Platinum if thats what they have- 7 bucks each, and outlast outplay outwit the denso
#22
Swapped out the plugs(I was running rich by the looks of the plugs but It may be from all the seafoams 7+ times) also cleaned out the IVAC and it's more responsive...... We'll see if it solves the problem
#27
Senior Moderator
Originally Posted by silver2003tl
Headhunter: Were you getting *random* misfire ie. more than in one cylinder? I think it's unlikely that 1 injector would cause misfire in the other cylinders.
#28
Originally Posted by fsttyms1
It doesnt but our cars are very sensitive and the ECU will often thro a multiple misfire code when its just one cyl
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misfiring
hi guys, has anyone had misfiring from all the cylinders,
i had codes.po300,PO301,02,03,04,05,06.
i tried reseting it but it came back on the next day.....
iddle is low when i start the car, but it become normal when it start driving,....
i had codes.po300,PO301,02,03,04,05,06.
i tried reseting it but it came back on the next day.....
iddle is low when i start the car, but it become normal when it start driving,....
#30
Senior Moderator
Originally Posted by Soseductivesf
on the subject of injectors, is there an upgrade(3g tl-s or odyssey injectors)? i plan to go s/c and want to get around 350whp
#31
Senior Moderator
Originally Posted by robert hu
hi guys, has anyone had misfiring from all the cylinders,
i had codes.po300,PO301,02,03,04,05,06.
i tried reseting it but it came back on the next day.....
iddle is low when i start the car, but it become normal when it start driving,....
i had codes.po300,PO301,02,03,04,05,06.
i tried reseting it but it came back on the next day.....
iddle is low when i start the car, but it become normal when it start driving,....
Buy new plugs. and reset. if it comes back buy one new coil pack and start at 1 cyl. Replace it reset the ecu again and see if it comes back. If it does take off and go to the next cyl. Repeat till you find the one thats bad. (on our cars very often just 1 will cause the multiple misfire like you have)
#32
I give up............. Had to turn down the s/c sale because my missfire codes came back.. damn i was good for 2 weeks I think my engine's wearing down because I burn oil like crazy. I'm gonna change the coil packs but that's my last straw... Here comes 3G TL-S
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