Question about 1990 Chevrolet K1500

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Looking to find out where the vacuum hoses on a 1990 chevy k1500 4x4 go from the tbi its the 350 5.7

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There are several different configurations depending on the emission package on the vehicle. there was a 3 digit code on the emission label to tell you which set up you have, because there is federal/California, medium duty, heavy duty, light duty, high altitude, etc..

Posted on May 28, 2011

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I have a 1990 chevy c1500 4.3 tbi with a flooding problem. When I start the truck most of the time I have to hold the pedal down.Also when I let off the gas pedal there is a small backfire.I did notice...


To begin with do some testing. You can have a code scan done at most major parts stores free. You can also do individual component testing using a digital multi-meter and a haynes or chiltons manual for a guide.
(book is about $20) Sounds like possibly a throttle position sensor, or MAP sensor but that's only a guess and if I was working on it I would ALWAYS test before buying anything...with computerized systems it is far too easy to make a mistake if you don't.
The fitting on the trans is likely a vent tube fitting and really should not have a vacuum line attached. (just a hose to nowhere to keep water out)
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Mar 10, 2010 | 1990 Chevrolet C1500

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My 1990 350 tbi will not start. the fuel is getting all the way to the fuel injecters but wont come out


Make sure you are getting power to the injectors. I have the same,350 tbi. Check the fuses and relays and check the wires at the tbi to make sure one of them is not rubbed through. The injectors have to be getting intermitent power .

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Car wont idle, dies and shifts eratically


Hello;
It definetly sounds like a vacuum leak problem. The vacuum hoses are routed to perform various functions for the engine and transmission. They can be very difficult to track down. They are small diameter black hoses and start at the intake manifold (the source) and go to their respective locations.
They could be cracked, oil soaked, loose fitting, or disconnected to name a few problems to look for. Take it to a mechanic if you do not feel comfortable replacing the hoses.
Thanks;
Rich
RPM Northwest

Jan 22, 2009 | 1990 Oldsmobile Cutlass Ciera

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