Mostly it is caused by some contaminant in the fuel caused by a low quality fuel filter or by someone putting sugar in your gas tank. Like I said, very unlikely that this would happen.Ĥ) Fuel distributor clogged: Again, this is an unlikely scenario, but it can happen. Basically, you have to take your fuel distributor and air flow sensor apart and re-calibrate it. These are also inexpensive parts, even from the Volvo dealer.ģ) Airflow sensor plate out of adjustment or sticking: This is a very unlikely scenario, but it can happen. To fix these problems, you probably need a new gasket or new injector O-Rings. If the idle of the car speeds up, it means the engine just sucked in that flammable solvent through an air leak. Use quality (OEM Volvo) gaskets (intake manifold, throttle body).Ģ) Other air leaks: If you can actually get the car running, but it runs rough or has trouble starting, you can check for air leaks at the intake manifold gasket (where the intake manifold attaches to the head) or at the throttle body gasket (where the throttle body attaches to the intake manifold) or at the injector seals (where the fuel injectors are inserted into the engine.)Ĭheck for air leaks at these places by spraying a flammable solvent (such as WD-40 or carb cleaner) around the gasket or seals. When you replace them, use small hose clamps or cable ties to make sure that they are tight and don?t pop off. Use the right size of vacuum lines (metric!). Major vacuum lines, like those coming from the idle air motor, the auxiliary air valve, or the brake booster, will make a loud POP! the first time they come off, and after that the car won?t start at all.Īlways keep your vacuum lines in good condition. Vacuum hose is cheap so it?s a good idea to just replace all the lines when you get your Volvo. Are they all connected? Are any cracked or broken? Are they hooked up like the diagram under the hood shows (Vacuum hose routing sticker)? The easiest way to check for vacuum leaks is to look. Vacuum leaks can also cause abnormally high idle problems, as well as many other weird symptoms. Because of this the air/fuel mixture is lean meaning that there is too much air in the mixture. If there are air leaks in the system, more air is getting to the engine than is being measured by the air flow sensor plate. Unlike some EFI systems, K-Jet cannot compensate for vacuum leaks. It is dependent on vacuum lines due to the mechanical nature of the system. However, if you turn the key and the starter motor engages and the engine turns over but just won?t start, here are some common causes of this:ġ) Vacuum leaks: The K-Jet system is very sensitive to vacuum leaks. If you turn the key and NOTHING happens, you probably have a dead battery or the wires that connect to the starter solenoid are disconnected. Random no-start, or will not start unless left in Key Position II for a few minutes Idle fluctuates or ?hunts,? surging in gears 1-4, abnormally high idle g) line pressure regulator out of adjustmentĭifficulty Starting Engine Only When ColdĢ) Auxiliary air valve or idle air motor not working or stickingģ) Problem with cold start injector / thermal time switch circuitĭifficulty Starting Engine Only When Warmġ) Cold start injector stuck open or leaking If you want to do it on the cheap, read this article.ģ) Airflow sensor plate out of adjustment or sticking Due to the random nature of wire breakdown, the problems associated with a bad wiring harness can take almost any form. It can cause a lot of problems on its own. Note: If you have not replaced your engine wiring harness (1980 to 1987 cars) replace it first. Also, please refer to the K-Jet in Detail article for diagrams and descriptions of the K-Jet components. This is not intended to be a full course in fixing cars in general, so I?m not going to cover how to check your spark plugs or distributor cap and rotor or reset your timing belt. I have included some basic info for testing things common to all cars (like the throttle body sticking) but this mainly covers K-Jet related problems. I will try to cover the most common symptoms and their usual suspects. There are a lot of different things that can go wrong with a mechanical fuel injection system.
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