Question about Cars & Trucks
Does it have spark at the plugs ? if it does then check the fuel pressure, if it is low install a new pump and change the plugs and try to start.
Posted on Dec 15, 2016
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Posted on Jan 02, 2017
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May 16, 2017 | Buick Cars & Trucks
Jun 24, 2017 | 1992 Mercury Sable
You turn the key to start and hear the starter
motor crank the engine, but when you release the key, the cranking stops and
there is silence. This means that the battery and starting motor are working
properly, but the engine is not firing. If you continue cranking the engine
over in this way, the battery will eventually run down and will need to be
recharged, but the battery and starter are not the cause of your problem.
There are a number of causes for this type of no-start condition, the most common being that you are simply out of gas. Assuming that you have fuel in the tank, you will need to go through a series of tests to determine what is causing the problem. The testing procedure is as follows:---
Spark:---------An easy way to test for
spark is with an inexpensive spark tester. This is a device that is readily
available at most auto supply stores. You use it by simply holding it next to a
spark plug wire. If you see the neon lamp flashing while someone cranks the
engine, then you have spark and should move on to checking for fuel. If there
is no spark, or a very weak spark, you will have to replace the spark plug or
the coil pack.It has to be checked.
First step here is to listen for the fuel pump running inside the gas tank. When you turn the key to run, you should easily hear the pump come on, run for a few seconds to build fuel pressure, then turn off. If you do not hear it, it could mean that the fuel pump or circuitry is bad. (Fuel pump failure is a common problem).
Fuel injected cars are very sensitive to proper
fuel pressure. If the pressure is off, even by a few pounds, it will cause
noticeable performance problems, or a no-start condition. To check for proper
fuel pressure, you will need a fuel pressure gauge that is suitable for your
type of system. Or you can also get the fuel pressure tested at local car garage,
If fuel pressure is low then its a fuel pump and fuel filter related problem.
If you know that you have spark and fuel, the
next step is to check for compression. For this, you will need a mechanic's grade
compression tester that will screw into a spark plug hole. You will need to
remove the spark plugs and use the compression tester to test the compression
on each cylinder. If the compression is very low on all cylinders, that is a
sure sign that the timing belt (or timing chain depending on the engine) has
failed and will have to be replaced.
This troubleshooting will let you know the problem.Thanks.
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