Hey, Got a 92 2+0 NA Its starting to misfire, I've replaced the coolant temp sensor and had an air intake service. Still misfiring, so I've been told to replace all the spark plugs and all the coils as well. But what i want to know, is there a way to tell what spark plugs and what coils are coursing the misfire? Also, what spark plugs will I need to buy? Cheers.
If you switch the coils around and leads plug etc to a different cylinder if it still does it then you've identified the problem. By the way, do you have old injector connector clips. Mine was misfiring badly and it turned out to be one of the injector connectors and its harness was badly corroded. get a long screwdriver whilst the car is running, put touch the tip inbetween the two philips screws on the injector itself and the handle end up against your ear to see if its clicking whilst the engine is running. Its a definite click, if its not clicking then thats your problem. It could be anypart of above plus what u mentioned already.
This ^ Defs check your plugs/wires if they are old....And ill give ol' Baz a plug here by contacting forum member Black Baz for some new coil pack plugs and Injector plugs/other for other electrical doodads
PTU or 'igniter' is a common cause of dropping a cylinder, sometimes intermittantly and sometimes permanently. Do you have a series 1 (big silver) or series 2 (small black) one fitted?
Whoever told you this clearly has no idea on diagnosing engine problems! Try the suggestions offered, that aren't going to cost you money first.
Hi, all previous advices is good? there are a number of checks to do on these cars and regular maintenance you should keep up with. Before changing any parts you should run the CPU diagnostics and check and clean all connectors. They often get corroded and inhibit proper performance. When you say you had the temp sensor replaced, I assume you mean the ecu sender unit (two prong) not the temp gauge sender unit (single prong). I would also recommend checking the connectors to the CAS & TPS units and confirm the TPS is set to the correct voltage and then do a timing check with a timing light (15 tdc). Check in the tech section for hesitation issues and timing. The best (arguably) plugs for your NA are the NGK?s PFR6B-11 (these were made for it and used by Nissan), Iridium?s will work but were designed for higher revving engines so don?t self clean as well. Again there are heaps of thread on this subject and lots of different opinions. You really need to know how to work on these cars yourself or at least diagnose things other wise mechanics will cost you a fortune. Beast of luck.
Before replacing coils, ask around. I had mine tested $10 each normally, was a little cheaper this time, through Inject-A-Carb in Toowoomba. There should be someone local to yourself that can do this. Takes about 15mins to check them all. I had one only with a low output but all were working. Will save you a tonne of money in the long run. I am having similar issues with my '89 TT. Haven't found the problem yet but am at the stage of testing the AAC valve. I would guess they did not look at this in your air intake service, worth asking though. This is what has led me to check into it http://forums.nicoclub.com/iacv-aac-valve-t322892.html Zwicked comments.
