Question about 1992 GMC Sonoma
I can push the gas pedal down to the floor at 40 and cannot go any faster, I just had the valve cover seals replaced and the valves set. It starts beautifully and does not "miss" when idling. The engine is in great shape and well cared for. I replaced all the brake lines,and also put a new gas tank,seals,and lines on.I have given it a new oil and antifreeze change also but I still have no power
With the car not running, get someone to push the pedal all the way down and check to see if the throttle valve is fully open.
If it is, chances are the engine is being starved of fuel (plugged fuel filter, plugged or undersized supply line, faulty pump, faulty regulator, etc.) - check the fuel pressure at the engine.
If it isn't, there is probably no cable adjustment and you will have to replace the linkage cable.
Posted on Aug 03, 2017
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Posted on Jan 02, 2017
did you do a fuel pressure test? if you havent do it its cheep an at least you can elimanate that. if thats not an issue, then there is only two other things crank sensor, and if there is one cam sensor.
Posted on Feb 02, 2009
P1133 - Heated Oxygen Sensor (HO2S) Insufficient Switching Bank 1 Sensor 1
I would have the repair shop see if they either damaged or left disconnected the oxygen sensor for engine cylinder bank one upstream sensor, this sensor would have been disconnected if the oil pan was removed.
Posted on Apr 20, 2009
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.
Posted on May 25, 2009
The idle air control valve will be located at the top of the engine on top of the intake manifold. If you hold the new valve and then look at the manifold you should see where it goes. I'm guessing it'll have 2 screws and 1 electrical connector. The one's that I've replaced were very easy to get to and replace. Not sure on your vehicle. The screws may be phillips or torx type heads. Good luck, if this helps please rate this. Thanks.
Posted on Jul 04, 2009
Hi I'm litoshop if you bled the system and get no results then your brake pump needs to be replaced now before replacing make sure your pads are installed correctly because if there not this to can cause this problem good luck. if this information has been useful please let us know thank you.
Posted on Aug 11, 2009
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