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Just for the record, thats the throttle body.
Have you checked to see if the injector is opening ?
If it is a vortec engine, is fuel pressure at least 65psi ?
2001-2004 gmc sonoma 4.3 [X, W Eng.] fuel system specs: 60-66 psi when you turn the ignition key (fuel pump) on without starting the engine. If fuel pressure drops back down quickly after fuel pump stops working (works for only 5 sec.) then you have a bad fuel pump or leaking injector spider.
Hello, the air pump is located under the rad. on the lower core support towards the right. and yes you will need to replace the air pump, you will also need to install a updated hose assembly with a new filter. also in allot of cases the air pump fuse will blow when the air pump goes bad. the fuse is located by the battery in the right fender.
17803252
Pump Kit, Secondary Air Injection
1999-2000 L35
It could be a bad fuel pump located usually under the rear of the vehicle on either passenger or driver side. Or you need to replace the fuel filter may be plugged up.
Check the fuel pressure at the shredder valve, you should have 62 to 65 PSI when the fuel system is primed. (engine not running) With the engine started and running the pressure should drop by 5 PSI, anything less then 62 PSI in your fuel system when trying to start the engine will cause a no start. Note; that try to start a the engine by pouring gas through the throttle body may cause an internal fire in the intake ports and will cause the fuel injectors to melt creating a more expensive problem. As for the fuel pump in the gas tank, it''s held on by and snap ring which you can remove with a simple screw driver. Good luck and keep me posted, and don't for get to replace the wire harness from the frame to the gas tank. It's a $12.00 investment that's worth more then it's cost.
The years of 1996 to 2002 with the engine code L35. Just becareful that the year 2002 is the change over year from L35 to LU3.
The L35 fuel system is the SCPI (Sequential Central Port Injection)
The LU3 fuel system is the MPFI (Muilti Port Fuel Injection)
Good luck and hope this Helps.
Check the fuel pressure at the Shredder Valve, You should have 60PSI to 65PSI upon start and should drop about 5PSI when running. If your fuel pressure is good then it may be a bad injector system. The fuel injector spider system that the vortec has are know to go bad, from the fuel pressure regulator to the puppet fuel valves.
Change the fuel filter first if it has not been changed yet and have the fuel pressure check. Good luck and keep me posed. Note: it's been know that spraying ether to start the vortec with the spider injector system has got the puppet valves to catch fire and melt the ends of the puppet valve leading to the replacement to the whole system.
Good luck and keep me posted, be glad to help.
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