Question about Chevrolet Silverado 1500
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Posted on Jan 02, 2017
SOURCE: 1991 gmc sierra wont start
There are so many things that could have caused this problem to occur. Here are some of my suggestions:
1. Blockage in the air supply to mix with the fuel. Throttle body might need cleaning
2. Compression in the cylinders might be low, probably due to large ring gaps. If you can get your hands on a compression tester to check the compression values of each cylinder, so as to ensure they are in operable range. By the way, was the vehicle smoking heavily when in operation?
3. Is your battery giving a good turn over of the engine? A weak battery can cause an engine not to start. The engine would turn over but just won't start. (Is the engine turning over when you try starting, or does the engine not responding when turning the key?)
4. Igniter in the distributor might need electrical checks to ensure proper electrical circuitry. Liaise with an auto-electrican about this.
Posted on Dec 29, 2008
Wow you have replaced a lot of stuff. Lets go back to the Fuel pump. When you replaced it did you replace the hose between the pump and the sending unit. These are common for splitting. Have you hooked up a fuel pressure gauge to check what pressure you have? It should be real close to 13 psi and should raise to at least 18 or 19 when you pinch off the return line.
Posted on Jun 02, 2009
Try changing the fuel filter and checking the fuel pressure at the shredder valve. The readings should be 60 to 65psi with the fuel line pressurized with the engine not running, once the engine is running. It should drop by 5psi. Start with the simple things first. Keep me posted, be glad to help.
Posted on Jun 28, 2009
I am dealing with the same issue. I have had the computer checks and there is nothing to indicate an issue.There were no computer error codes yet I stall at red lights.
The O2 sensor, the speed sensor or the MAP sensor may be one of the problems. The MAP sensor measure the air pressure in the manifold. It is commonly mounted on the fender and is low in cost and easy to replace. To test it if your if your car won't start, unplug the electrical connection from the MAP sensor. If it starts, then you know to replace the MAP sensor. The Hall Effect sensor can fail and not set an error code. This is an inespensive part that sits underneath the rotor in the distributor cap on cars without distributorless ignition. This only applies to cars made after 1996. Also check the fuel injectors and fuel filter.
If you have a burglar alarm, make sure that it is not causing the problem. It often times can cause the stalling issue.
Posted on Jul 18, 2009
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