Series 1 misfire on rotor 1
I've been chasing this misfire for a week now. It pops up at about 4k rpm on rotor 1, and it seems to be a wiring issue. I was trying to get it to move to rotor 2 by moving things. I rotated the coils, plugs, wires, and injectors one by one, starting each time, and it misfired on rotor 1 each time. Any help on where to start looking for shorts/ wiring issues would be extremely helpful. thanks guys :)
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How's the catalytic converter? I'd look there first. Since you rotated the coils and plugs, that would seem to indicate it's not an easily accessible wiring problem, if at all. Eliminate the easy stuff first.
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Originally Posted by Loki
(Post 4867852)
How's the catalytic converter? I'd look there first. Since you rotated the coils and plugs, that would seem to indicate it's not an easily accessible wiring problem, if at all. Eliminate the easy stuff first.
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Wait for the car to cool.
Lift the passenger side and support it with jack stands. Remove the three bolts connecting the exhaust manifold outlet to the front of the cat. Gently pull it down a few inches and shine a light in there. See if it looks like a very fine honeycomb, mesh, or spiral. If it looks like chunks are broken off or it's folded in on itself, your cat is hosed. Maybe post a photo here. |
Originally Posted by NotAPreppie
(Post 4867854)
Wait for the car to cool.
Lift the passenger side and support it with jack stands. Remove the three bolts connecting the exhaust manifold outlet to the front of the cat. Gently pull it down a few inches and shine a light in there. See if it looks like a very fine honeycomb, mesh, or spiral. If it looks like chunks are broken off or it's folded in on itself, your cat is hosed. Maybe post a photo here. |
Yah, that's not going to last. Even Permatex Ultra Copper won't hold up against rotary heat.
If you used too much of the stuff, it might be causing some of your problems. Get the proper gasket and scrape all of that crap off of the mating surfaces. |
Originally Posted by NotAPreppie
(Post 4867861)
Yah, that's not going to last. Even Permatex Ultra Copper won't hold up against rotary heat.
If you used too much of the stuff, it might be causing some of your problems. Get the proper gasket and scrape all of that crap off of the mating surfaces. |
It would also be good to get OBD data on airflow and fuel trims on a warm idle (and warm idle only). If the cat is fine, you have an array of possible culprits from poor aftermarket intake to misbehaving injectors. Having data might help add supporting evidence for or against any of those.
And also also, from the "eliminate easy things first" opera, perform the 20-time brake pedal stomp procedure to reset the ESS profile. It's possible but a bit unlikely that it would cause a single rotor to misfire, but it's so easy to try that you'd be silly not to. |
Originally Posted by Loki
(Post 4867890)
It would also be good to get OBD data on airflow and fuel trims on a warm idle (and warm idle only). If the cat is fine, you have an array of possible culprits from poor aftermarket intake to misbehaving injectors. Having data might help add supporting evidence for or against any of those.
And also also, from the "eliminate easy things first" opera, perform the 20-time brake pedal stomp procedure to reset the ESS profile. It's possible but a bit unlikely that it would cause a single rotor to misfire, but it's so easy to try that you'd be silly not to. |
Originally Posted by VeRdantcs
(Post 4867853)
I hadn't thought of the cat, the seller I purchased it from said it had a new one so I haven't checked it. How do I go about doing that?
Bad cats can cause misfires, but you'd usually get a P0420 code. If it is a cheap cat, you should take it off and install a midpipe. If it's still good, you can save it for emissions testing if needed, unless you're in Cali. If it's already bad, you can gut it until you get a decent pipe. You should avoid running it with the cat while it's misfiring. Misfires kill cats, bad cats kill engines. |
Ah so you replaced the engine. Definitely do the 20-time brake stomp procedure (google it). Without getting into physics, your computer learns the behaviour of the ESS (crank position sensor for all intents and purposes), so if you change the engine, including a different ESS, you need to force it to relearn the new sensor. Hence the 20-time brake thing, it's the secret code to clear non-volatile memory and force a relearn.
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Issue fixed!
Originally Posted by Loki
(Post 4868001)
Ah so you replaced the engine. Definitely do the 20-time brake stomp procedure (google it). Without getting into physics, your computer learns the behaviour of the ESS (crank position sensor for all intents and purposes), so if you change the engine, including a different ESS, you need to force it to relearn the new sensor. Hence the 20-time brake thing, it's the secret code to clear non-volatile memory and force a relearn.
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Originally Posted by VeRdantcs
(Post 4868091)
It was the ess after all, It runs so much smoother now, and throttle response is improved. Most of all, no more misfire! Thanks for all the help, guys.
:) Don't forget to look into your cat situation. |
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