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Because you're guessing and throwing parts at the problem in the hopes of stumbling onto a solution, I would recommend you try and apply a formal problem solving technique. This will give you an economical and logical road map to finding a solution. Or at least narrow down where to look. Even a chronological notebook will be of help.
I had a real difficult to find miss in my Acura Legend. After making a few guesses and throwing parts at it, I decided to use my professional training and use a fishbone diagram. Essentially, it's just a written down process of elimination.
Process:
List how ever many Main Categories you can think of.
Under each Main Category, list all the sub-categories that can contribute to the problem.
Conduct a test on each sub-category and list the results.
This is a living document. You can add main and sub-categories as the need arises.
When I got to the Fuel category of the diagram, I had the cause of the miss - a partially plugged No. 4 injector. The solution was easy and proved permanent - replace the No. 4 injector.
Cause and Effect (modified Fishbone) diagram - Misfire, 1987 Acura Legend
Traces are already damaged and I worry that simple capacitors change is not enough. Sometimes internal layer's coppers are eaten by the condensed QAS liquid which is very strong alkali and it is almost impossible to be fixed by most of average rebuilders.
ECU came back today. Plugged back in and it worked instantly no misfire/smoke…wish I done it sooner. +1 for ecu repair. Check your ecu, especially for 1996 year. 150$ repair.
ECU came back today. Plugged back in and it worked instantly no misfire/smoke…wish I done it sooner. +1 for ecu repair. Check your ecu, especially for 1996 year. 150$ repair.
Glad it worked! Thank you for coming back & updating the thread. Too many unresolved issues with people 8 years later saying "OP DID YOU FIX".
Hmm. These cars typically need a valve adjustment never.
IF they need one the need will develop through very slow wear over many years.
The valve adjustment is also a BIG jobb on these.
It is very likely your ECU that is giving you problems. Get that fixed. It needs new capacitors.
Hi, I'm having the same issue. I was wondering if you'd be willing to tell me what company you used to have your ECU fixed?
I've been having an issue with my 1997 LS400 misfiring with the code P0300, it shows for the even side of the engine so banks 2,4,6,8 are misfiring. My car also sometimes has a weird jerking motion when I slow down to a stop, similar to stalling but it never fully stalls, almost as if it is choking. My car idles at around 400 rpm. I have done Spark plugs, spark plug wires, rotors and caps, new steering pump w/ IACV delete, valve cover gaskets, timing job, water pump, replaced transmission shift solenoid E, replaced Upstream O2 Sensor, and also an ECU refresh from SIA electronics. I am led to believe that the Fuel pump resistor or lock-up trans solenoid is the issue for the misfire and the weird jerking sensation when slowing down to a stop. I was wondering if anyone else had any other suggestions or advice as to what to fix or look into?
06-08-23, 05:37 PM
