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These types of problems can be a pain to track down, and if the problem is an intermittent one, it can be months before the cause is found. With my 1991 TT, last year I was on a 400 mile trip with about 50 miles to run. I decided to pull over in a small town for a break. As I was part way through a U turn, doing about 5 mph, the engine stumbled and cut out. Power steering dropped out, but luckily I was able to bring the car to a stop just in time to avoid smashing into the footpath (sidewalk). Started the car again, and you know, this problem has never happened since. This article isn’t intended to be a complete treatise on electronic fuel injection diagnosis. I’ve written this simply from the point of view of a do-it -yourselfer, and I hope that anyone who has stumbling problems with their Z will read this and come away with some thoughts on what to do next. You may decide to fix it yourself, or you might want to profile the problem to enable an expert to pinpoint the solution quickly. Page numbers referred to in the Nissan 300ZX Service Manual are taken from the 1990 edition in English. Page numbers may vary according to the edition. Basic Causes of Stumble. With computer controlled EFI, the computer or any of its sensors or actuators can go faulty, and when this happens you can get, you guessed it- incorrect ignition and incorrect fuel/ air mixture for the required operating condition, thus engine stumble. The Problem arises when the engine is cold. If the temperature sensor circuit is open or shorted, the ECU assumes the engine temperature is 20 deg C or 68 deg F while starting, then when running, assumes the engine temperature is 80 deg C or 176 deg F. Here’s a report from Peter Garcia (edited).
Tags : electronic fuel injection, fuel air mixture, nissan 300zx, engine hesitation, nissan engine, incorrect fuel, sensor circuit, engine temperature, mile trip, u turn, page numbers, footpath, temperature sensor, actuators, fuel injection
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