misfire, lsvtec-T when hot
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misfire, lsvtec-T when hot
hey all...
I have bought new plugs and have had this issue for quite some time. I gapped to .030.
I bought a new IACV
I swapped the TB
Checked voltage at TPS, it was at .7... i adjusted to .5
the idle improved, but when the car gets hot it misfires...
it did misfire a few times at high RPM. Not sure if it was due to the TPS being out of spec (can the tuner adjust this during the tune session?)
here is the kicker....
when i turn on the heater, its starts to misfire and rpms dip,
when i turn on any additional accessory power, lights, stereo... it reacts with misfiring and my wideband O2 AEM goes off the charts...... (idle is at 12.5, WOT goes 10.00) i know this is a little on the rich side....
I am leaning towards possibly bad alternator?(14.4v at idle) but the batt is getting proper voltage ........
I replaced the dizzy with an additional dizzy from another LS that I had. Maybe its a bad ignitor or coil? *pulling my hair out*
please help thanks
I have bought new plugs and have had this issue for quite some time. I gapped to .030.
I bought a new IACV
I swapped the TB
Checked voltage at TPS, it was at .7... i adjusted to .5
the idle improved, but when the car gets hot it misfires...
it did misfire a few times at high RPM. Not sure if it was due to the TPS being out of spec (can the tuner adjust this during the tune session?)
here is the kicker....
when i turn on the heater, its starts to misfire and rpms dip,
when i turn on any additional accessory power, lights, stereo... it reacts with misfiring and my wideband O2 AEM goes off the charts...... (idle is at 12.5, WOT goes 10.00) i know this is a little on the rich side....
I am leaning towards possibly bad alternator?(14.4v at idle) but the batt is getting proper voltage ........
I replaced the dizzy with an additional dizzy from another LS that I had. Maybe its a bad ignitor or coil? *pulling my hair out*
please help thanks
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Re: misfire, lsvtec-T when hot
what about a dirty open on a wire somewhere losing connection when the car gets hot? (sort of like when you bend a paperclip back and forth untill its brittle, but not broke)
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Re: misfire, lsvtec-T when hot
Also, make sure you keep the plastic cover for the coil that's inside the distributor. If you don't you could cause it to arch because of the amount of mJ of energy that's higher than the OEM.
You can find them here at summit Racing.
http://www.summitracing.com/parts/ac...Fe99OgodMjAAZA
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What temp does " gets hot mean"?
When the car is at operating temp?
After a long drive?
Is it tuned in open or closed loop
Does this happen when you let the motor idle without driving then it starts to misfire when its warmed up?
Idk how people can suggest parts with such little info
When the car is at operating temp?
After a long drive?
Is it tuned in open or closed loop
Does this happen when you let the motor idle without driving then it starts to misfire when its warmed up?
Idk how people can suggest parts with such little info
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Re: misfire, lsvtec-T when hot
The coil solution was only if it was indeed the problem as wantboost was suggesting. We still don't know ALL of the information, but if that is ONE item that's a part of the overall picture. One part of the solution could be this coil.
It could be plugs, wires themselves, something regarding timing, or even fuel related.
The coil wasn't the overall solution. just one portion to think about if indeed the coil was bad after further investigation.
But you're right. No details = no true solution.
It could be plugs, wires themselves, something regarding timing, or even fuel related.
The coil wasn't the overall solution. just one portion to think about if indeed the coil was bad after further investigation.
But you're right. No details = no true solution.
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Re: misfire, lsvtec-T when hot
it could be anything really... until he starts testing individual components and systems and reporting back with results we can only speculate
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Re: misfire, lsvtec-T when hot
i found a non OEM coil in the dizzy. I will purchase this coil as recommended and an ICM since I allready have the dizzy apart. then I will report back... Timing is good. fuel is good..
I start or drive the car untill its hot it will miss and after about 10-15 minutes of letting it idle to operating temp, right before the fans kick on it starts to miss... then it misses constantly when the fans kick on. or when i turn the heater on, or if i turn the headlights on... The fans stop spinning, the Rpms return to normal. seems constant with electrical load, that is why i am leaning towards an ignition issue.
checked all grounds, the one on the valve cover had paint (from painting the VC) so i scratched it off.. still same issue... The original TPS was off at .7 at idle.. It is jumping, new one on the way from JHPUSA (california resident).
will update. Thanks for all the help. I would test the leads on the plug wires, but my probe is too short (we can skip the funny jokes). lol
the plugs are new and gapped at .030 , would .032 make a difference or would .028 make a difference? i will get detailed after the new parts are in. Thanks folks.
I will do a search for the procedure for testing the dizzy and try that tonight and see where it gets me.
Question.. If i mark the dizzy with a sharpy, will it necessarily keep the timing there when i put the dizzy back? (not cranking motor while off)... how sensitive is the position of the dizzy?
I start or drive the car untill its hot it will miss and after about 10-15 minutes of letting it idle to operating temp, right before the fans kick on it starts to miss... then it misses constantly when the fans kick on. or when i turn the heater on, or if i turn the headlights on... The fans stop spinning, the Rpms return to normal. seems constant with electrical load, that is why i am leaning towards an ignition issue.
checked all grounds, the one on the valve cover had paint (from painting the VC) so i scratched it off.. still same issue... The original TPS was off at .7 at idle.. It is jumping, new one on the way from JHPUSA (california resident).
will update. Thanks for all the help. I would test the leads on the plug wires, but my probe is too short (we can skip the funny jokes). lol
the plugs are new and gapped at .030 , would .032 make a difference or would .028 make a difference? i will get detailed after the new parts are in. Thanks folks.
I will do a search for the procedure for testing the dizzy and try that tonight and see where it gets me.
Question.. If i mark the dizzy with a sharpy, will it necessarily keep the timing there when i put the dizzy back? (not cranking motor while off)... how sensitive is the position of the dizzy?
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Re: misfire, lsvtec-T when hot
*update* for the primary coil between the "+" and the "-" i get 2.4 ohms resistance... meter set at OHMS 200 (supposed to be between 0.6 and 0.8). Now when i test between the "+" and the spring (secondary coil) i dont get anything on my meter... set at 20k ohms on the meter for testing... i know its supposed to be between 12.8K and 19.2K
But the car runs... ... would it still run under this circumstance or is my meter jacked up?
i am following this thread on the HOW TO
http://www.team-integra.net/forum/bl...eshooting.html
But the car runs... ... would it still run under this circumstance or is my meter jacked up?
i am following this thread on the HOW TO
http://www.team-integra.net/forum/bl...eshooting.html
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Re: misfire, lsvtec-T when hot
*update* for the primary coil between the "+" and the "-" i get 2.4 ohms resistance... meter set at OHMS 200 (supposed to be between 0.6 and 0.8). Now when i test between the "+" and the spring (secondary coil) i dont get anything on my meter... set at 20k ohms on the meter for testing... i know its supposed to be between 12.8K and 19.2K
But the car runs... ... would it still run under this circumstance or is my meter jacked up?
i am following this thread on the HOW TO
http://www.team-integra.net/forum/bl...eshooting.html
But the car runs... ... would it still run under this circumstance or is my meter jacked up?
i am following this thread on the HOW TO
http://www.team-integra.net/forum/bl...eshooting.html
actually secondary is within spec... at 15K
NOTE my meter isnt the greatest... 9.99 harborfrieght
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Re: misfire, lsvtec-T when hot
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Re: misfire, lsvtec-T when hot
recieved the new coil today, installed ( the ACCEL from summit) had a fitment issue, had to cut the tabs back on the plastic protector and the position of the holes that the screw goes through was a bit off. Not too problematic though.. I tested the primary coil and the secondary, getting the same results but the car runs about 90% better. The idle is stable and does not fluctuate. It is solid for the most part. It still sputters a small bit at idle when its real hot, the severity has been less frequent and less agressive.
Issue is still there a small bit , to the point where i dont want to complain and ill drive it, but it is still present.
What route should i take next? I just ordered some OEM ngk plug wires , will see if that helps.
Issue is still there a small bit , to the point where i dont want to complain and ill drive it, but it is still present.
What route should i take next? I just ordered some OEM ngk plug wires , will see if that helps.
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Re: misfire, lsvtec-T when hot
Reset the ecu.
sometimes if the coil goes bad the ecu will do funny things to compensate.
it's not uncommon for heat and vibration over the years to crack the coil potting material allowing it to arc and barely light off a cylinder.
I think once you reset the ecu and the fuel trim tables and some of the closed loop values clear themselves you'll see a difference
sometimes if the coil goes bad the ecu will do funny things to compensate.
it's not uncommon for heat and vibration over the years to crack the coil potting material allowing it to arc and barely light off a cylinder.
I think once you reset the ecu and the fuel trim tables and some of the closed loop values clear themselves you'll see a difference
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Re: misfire, lsvtec-T when hot
reset ECU same issue...
the new TPS came in the mail today... found a golf ball sized hole in the package to find that my new TPS was damaged in transit from JHPUSA. I contacted them and they advd they will work with me but will be back in the office on tuesday. Will update if this fixes the issue... for now she sits in the garage.....
the new TPS came in the mail today... found a golf ball sized hole in the package to find that my new TPS was damaged in transit from JHPUSA. I contacted them and they advd they will work with me but will be back in the office on tuesday. Will update if this fixes the issue... for now she sits in the garage.....
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Re: misfire, lsvtec-T when hot
If you end up needing a known good Honda tps I can help you out with one of my spares. 110% guaranteed to show up intact lol.
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Re: misfire, lsvtec-T when hot
anyways here is where we are at
NEW NGK plugs and wires...
NEW coil by ACCEL
TPS calibrated to .5 idle and 4.5 WOT...
I start the car... let it warm up... it fires up every time......
when it gets to operating temp... it sputters very little now....
if i turn on the heater, it sputters from the electricity being drawn, and then the computer corrects it some 4-5 seconds later.....
can I say that this is now normal?
I have a coolant temp sensor available, i have been lazy at putting it in....
I can hear the 750CC RC injectors...
OOOO GUESS WHAT! i just got my new tool in today also, the one that adjusts the valves with the flathead and the 10mm around it... maybe needs a valve adjustment? im at about 10K miles since rebuild and I did it when i did the rebuild... what do you think?
Last edited by supersilverdc2; 05-28-2014 at 07:22 PM.
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Re: misfire, lsvtec-T when hot
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Re: misfire, lsvtec-T when hot
JHPUSA called me today advised they are going to ship me the new TPS.
Also, took the car on a long drive to look at a house im going to buy.. car was fine when i got there, turned it off, looked at house.... sat around for about 30 minutes......
started the car and it was sputtering again........... I put my foot on the gas pedal and it was almost as if it wanted to stall for a split second or hesitate..... or a delay in throttle response at about an 1/8 of a second... was not smooth... which brings me back to think it is the TPS.....
Also, took the car on a long drive to look at a house im going to buy.. car was fine when i got there, turned it off, looked at house.... sat around for about 30 minutes......
started the car and it was sputtering again........... I put my foot on the gas pedal and it was almost as if it wanted to stall for a split second or hesitate..... or a delay in throttle response at about an 1/8 of a second... was not smooth... which brings me back to think it is the TPS.....
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Re: misfire, lsvtec-T when hot
Not sure, im not a fan of aftermarket parts from either of those companies. I have had many issues... Thats why i try to go with a company that is targeted towards what I am doing, and not just the average stock joe.