Look under the hood......
(There's usually a vacuum diagram on the underside of the hood or somewhere in the engine compartment)
Depends on what vacuum lines google it select show images or auto zone has diagrams on line
SOURCE: Spark plug gap on a 1992 Gmc Sonoma 4.3L V6 FI
Usually somewhere on the engine or in the engine compartment, there is a sticker with the engine specifications. The spark plug gap should be included. If not .032 or an inch should be close.
Good luck
SOURCE: I need to see the "how to's" in replacing the one way check valves on my 2001 gmc sonoma 4.3
On the 2001 gmc jimmy 4.3L v6 engine there are two air pump check valves: there's a pipe (about 1" diameter) that comes off each of the exhaust manifolds. the check valves are screwed onto those pipes. then a rubber hose (about 1.25" outside diameter) is clamped to the front of each check valve and connects to the air pump, which is hidden behind the vehicles grille in front of the radiator. typically, if you need to replace these (the life expectancy is about 3-4 years), it starts a chain of events that might be as follows: during the wintertime, water from the exhaust leaks through the worn out one-way check valves, and ends up in the air pump. the water freezes, and the ice jams the air pump, which may or may not ruin the air pump, but which usually blows the air pump fuse, which is impossible to find if you're rummaging around the passenger compartment fuse box or the under-hood fuse and relay box. it ain't there! so if you're looking under the hood leaning up against the front bumper, slide to your left around the passenger side headlight. now you should be looking at the battery, leaning up against the passenger side fender. look down between the battery and the fender. you have to push a few things out of the way, but there you will find a green 30 amp blade fuse (about 1" x 1" fuse--and $2.99 at autozone). this blown fuse should have triggered the check engine light and a DTC (diagnostic trouble code) of p0410 (secondary air injection system). for that vehicle there is a TSB (technical service bulletin) put out by gm (bulletin # 04-06-04-015; march 2004). if you want to print out some literature about all that i've mentioned just surf on over to http://www.obd-codes.com/p0410 for more links and documentation. my credentials: self-proclaimed auto mechanic for 26 years (sorry, no ase certification yet [but still trying to find time to study for the tests]) and college dropout (after 3 years of electrical engineering)--so, in other words, don't believe a word i say; just go to that website and get it straight from the horse's...
Good luck and hope this helps. I know you have a Sonoma but we have the same platform. I am thinking of buying a set of headers without the Air injection system and having the jimmy dyno tuned again to eliminate the service engine light and recalibrate the ECM to eliminate the air injection pump.
SOURCE: my 2001 GMC sonoma stalls out going up hill?
how much fuel in tank and how long driving uphill???Pump may be running dry
SOURCE: I need to know how to change the fuel filter in a
Changing filters is on of the easiest at home jobs you can do.
Just locate the the fuel filter housing, take a look and figure it out.
Its as easy as putting air in your tire if you find were its located.
Get The complete tear down and rebuild book for the 98 sonoma @ any parts store and look it up.
SOURCE: how do i know if brake booster is gone ? 2001 gmc
Do you by any chance hear a hissing noise from under the dash? If so, yes, you have a bad booster. For it to do what you're saying, it would almost have to have a vacuum leak. However, if there is a problem with something in the ABS system, you should have an ABS warning light on. Also, ABS can make the pedal fade, but I've never heard of it making the pedal hard. Your diagnosis of a brake booster does sound likely, but I'll admit I can't be sure -- this is an odd one.
Testimonial: "thanks, heard a hissing that i thought was coming from under the truck -- have to check tomorrow - actually my father's truck. have to get back there"
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