RPM hesitation on WOT?

[Yamajee]

Hey guys,

I'm still not sure if this is an ignition coil problem or a DI failure. No popping noises for me, had the P0351 code pop up a lot of times and cleared it a lot of times, it's just that it came up at high RPMs and didn't do any harm or show anything like the ignition coil is really faulty. But, now there's no CEL and whenever I go WOT I can feel the car hesitating like some sort of lag whenever under 5k RPM, and after 5k RPM the rpm goes up smoothly. Any idea?

My best bet is the ignition coil giving away, but can someone explain to me the symptoms of a direct injector failure as to relating that failure to my problem? did it cause any mis-fire or hesitation on WOT when your injector failed?

[steve99]

Originally Posted by Yamajee

Hey guys,

I'm still not sure if this is an ignition coil problem or a DI failure. No popping noises for me, had the P0351 code pop up a lot of times and cleared it a lot of times, it's just that it came up at high RPMs and didn't do any harm or show anything like the ignition coil is really faulty. But, now there's no CEL and whenever I go WOT I can feel the car hesitating like some sort of lag whenever under 5k RPM, and after 5k RPM the rpm goes up smoothly. Any idea?

My best bet is the ignition coil giving away, but can someone explain to me the symptoms of a direct injector failure as to relating that failure to my problem? did it cause any mis-fire or hesitation on WOT when your injector failed?

definitely looks like coil 1 failed (last digit is coil number) , this coil seems to fail the most maybe due heat , when code returns leave it up ,should be done under warrante unless you have significant mods eg turbo.

you usually get firecracker/popping sounds with DI seal failure, often with no cel.

[Yamajee]

Originally Posted by steve99

definitely looks like coil 1 failed (last digit is coil number) , this coil seems to fail the most maybe due heat , when code returns leave it up ,should be done under warrante unless you have significant mods eg turbo.

you usually get firecracker/popping sounds with DI seal failure, often with no cel.

I've had this ignition coil issue for nearly a year now and the dealer is still convinced that it's out of their hands and ordering it from Japan will take over 45 days, (yaay Dubai), might replace it myself, no mods just an exhaust.

No sounds for me, just the usual sounds of engine mis-firing with no backfire or anything, that feeling when it wants to rev but it holds itself as if you're letting off the gas pedal and then back full and so on.


[ame="http://www.youtube.com/watch?v=VnFa2IvNs9g"]Frs popping noise when given throttle free revving or cruising, rolling on throttle to pass. - YouTube[/ame]

is this what DI failure sounds like?

[steve99]

Originally Posted by Yamajee

I've had this ignition coil issue for nearly a year now and the dealer is still convinced that it's out of their hands and ordering it from Japan will take over 45 days, (yaay Dubai), might replace it myself, no mods just an exhaust.

No sounds for me, just the usual sounds of engine mis-firing with no backfire or anything, that feeling when it wants to rev but it holds itself as if you're letting off the gas pedal and then back full and so on.

is this what DI failure sounds like?

Hard to tell from video but does not sound good, definitly get dealer to check it out as it will cause further problems (often serious) if it is DI seal fail in progress.

its not a simple job

http://www.ft86club.com/forums/showt...t=di+seal+fail

http://www.ft86club.com/forums/showt...t=di+seal+fail

[Yamajee]

Originally Posted by steve99

Hard to tell from video but does not sound good, definitly get dealer to check it out as it will cause further problems (often serious) if it is DI seal fail in progress.

its not a simple job

http://www.ft86club.com/forums/showt...t=di+seal+fail

http://www.ft86club.com/forums/showt...t=di+seal+fail

That wasn't my car, found the video on youtube and thanks I'll check out the links.

[Astroboy]

Originally Posted by Yamajee

Hey guys,

I'm still not sure if this is an ignition coil problem or a DI failure. No popping noises for me, had the P0351 code pop up a lot of times and cleared it a lot of times, it's just that it came up at high RPMs and didn't do any harm or show anything like the ignition coil is really faulty. But, now there's no CEL and whenever I go WOT I can feel the car hesitating like some sort of lag whenever under 5k RPM, and after 5k RPM the rpm goes up smoothly. Any idea?

My best bet is the ignition coil giving away, but can someone explain to me the symptoms of a direct injector failure as to relating that failure to my problem? did it cause any mis-fire or hesitation on WOT when your injector failed?

Did you ever solve the issue you were having? What as it?

[Yamajee]

Originally Posted by Astroboy

Did you ever solve the issue you were having? What as it?

Had to clean out the injectors to resolve this issue, some had to replace them but cleaning them worked for me.

[fmsida]

Originally Posted by Yamajee

Had to clean out the injectors to resolve this issue, some had to replace them but cleaning them worked for me.

How did you clean them out or what process did you take? I am having similar issues, please PM me if you get a chance.
Thanks.

[Yamajee]

Originally Posted by fmsida

How did you clean them out or what process did you take? I am having similar issues, please PM me if you get a chance.
Thanks.

No clue, the dealership did that for me.. however, I do know that when injectors are cleaned, it's through a special machine made to clean them.



Something like this.