97 blazer have fuel and spark no codes
diezelarebetter
04-15-2007, 01:57 PM
i made the mistake of buying a chevy and now it wont start have spark and have fuel to top of motor will only fire if i poor fuel into the air intake it was running fine other then a rough idle at low rpms when it just died leaving my wife and kids in a intersection i have removed the so called spider injector rack thing cleaned it and did not see any thing visually wrong with it please someone help iam about to push the freaken thing into a lake ........ v6 vortec....
old_master
04-15-2007, 04:35 PM
If adding fuel to the intake makes it run, you have a fuel delivery problem. Fuel pressure is not directly monitored by the OBDII system and therefore can not turn on the SES light if there is a problem.
Fuel pump operation:
The fuel pump circuits are designed to energize the fuel pump continuously any time the key is in the START position. When the key is in the RUN position the fuel pump will operate provided the engine is running. If the engine stalls, or is not running for any reason, the PCM will shut off the fuel pump after approximately 2 to 3 seconds.
Fuel pressure test:
Install the fuel pressure gauge to the test port near the distributor. Turn the key to the RUN position but do not start the engine. While the fuel pump is running, fuel pressure must be 60-66psi. After approximately 2 to 3 seconds, the fuel pump will shut off. Fuel pressure must remain between 55-60psi for several minutes. A drop in pressure below 55psi indicates a leak. The most likely place is the fuel pressure regulator, or the lines under the upper intake manifold.
Here is a link to an inexpensive yet substantial fuel pressure tester: http://www.harborfreight.com/cpi/ctaf/Displayitem.taf?itemnumber=92699
Fuel pump operation:
The fuel pump circuits are designed to energize the fuel pump continuously any time the key is in the START position. When the key is in the RUN position the fuel pump will operate provided the engine is running. If the engine stalls, or is not running for any reason, the PCM will shut off the fuel pump after approximately 2 to 3 seconds.
Fuel pressure test:
Install the fuel pressure gauge to the test port near the distributor. Turn the key to the RUN position but do not start the engine. While the fuel pump is running, fuel pressure must be 60-66psi. After approximately 2 to 3 seconds, the fuel pump will shut off. Fuel pressure must remain between 55-60psi for several minutes. A drop in pressure below 55psi indicates a leak. The most likely place is the fuel pressure regulator, or the lines under the upper intake manifold.
Here is a link to an inexpensive yet substantial fuel pressure tester: http://www.harborfreight.com/cpi/ctaf/Displayitem.taf?itemnumber=92699
RK4332
04-21-2007, 10:59 PM
I just went through a very similar thing with my 92 Jimmy. It would stall, and not start back up unless i sprayed starting fluid in it. It turned out to be the fuel pressure regulator. A good way to find out is to take the plenum off, and look inside. If theres a clean spot on the side with the pressure regulator, that usually means its leaking.
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