20 Most Recent 1996 GMC Sonoma - Page 6 Questions & Answers

see the diagram attached and proceed according.you must test the switch for open or faulty, this problem NO permitt to goes the voltage to solenoid replace, However test any wires from swtich to soleonid can be broken or open and replace or repair.Of course you must test the Fuse or c. breaker for interruption. God bless youYou can prove to bypass the switch for solenoid see the diagram

Freeze plugs are round, metal/aluminum plugs located in various spots on the engine block. Their purpose is to prevent the engine block from cracking in freezing weather IF you don't have anti-freeze in your car/truck. The plugs will pop out as the water freezes (and expands) releasing the water from the engine block. Kind of a safety-valve device.
I am questioning your "mechanics" dstatement that they are 'shot'. They are either good (not leaking) or bad (leaking). If they are "shot" then you should be loosing antifreeze all over the place. Ask your "mechanic" for a reasonable explanation for his diagnosis.
I would suspect something else other than the freeze plugs causing your overheating problem (i.e. stuck thermostat, clogged radiator, cooling fans not working, blown head gasket)...
I would try ANOTHER mechanic, maybe one recommended by a friend. Lots of so-called mechanics out there that couldn't fix a pedal car....

its posible that in the proces of installing the pump your float got stuck .or it shorted out its a not uncomon that on GMthey fail very often just by removing them

Well that is the correct action of the pump relay. The computer grounds the pump relay for a couple of seconds to prime the pump then the oil pressure switch provides power once the engine starts.You should be able to jumper the relay and power the pump as much as you want to test the circuit.

Not sure. You need to do a little checking of ignition and fuel delivery. I would first check for spark at all four cylinders to eliminate or verify if ignition is causing it. If you have distributorless ignition, you have 2 coils. One coil serves cylinder 1 and 4, the other coil serves cylinders 2 and 3. If for instance, you have weak or no spark on 1 and 4, suspect the coil for them.If you have good spark on all four, a bright blue, snapping spark, then pull the spark plugs to check they are not fouled, like oil fouled that prevents spark..If ignition is good, look to the fuel system. Maybe an injector is blocked open by debris and won't close. That's very rare, but a possibility. The spark plug for that cylinder would likely be much wetter than the other plugs after cranking it over. Maybe the fuel pressure regulator has failed. If you can find the fpr on top of engine (some are located under the intake manifold, hard to get to. and some are fitted to the pump in the gas tank-impossible to inspect) then pull off the vacuum line to it and check for evidence of gas there-a sure sign of a ruptured regulator, and it will let extra gas get sucked into the engine-just like your problem. If you can't find the pressure regulator, you should have the fuel pressure tested-mainly to see if it is too high-also a pressure regulator problem,. likely.IDK, maybe this will help you a little, good luck.

Are you sure the pump is good? It NEEDS 60 PSI or it won't start. It may pump fuel but it needs the pressure.... If you need further help, I’m available over the phone at https://www.6ya.com/expert/justin_3ae27a9d61d6acd4

If the check engine light is on I would have that checked first. The trouble codes in the computer will help point you in the right direction for troubleshooting.You could have a sticking fuel injector, or an ignition problem, or both.

have you replaced the ignition control module in the distributor

Google it--lots to read & go to You Tube Video alsoThere is a fuel pressure regulator under the intake manifold & it has plastic tubes calledspyders going to each cylinder & on the ends are poppet valvesIt is a type of fuel injection

Have you checked the fuel pump, fuse,relay, fuel filter,etc.

If the oil pressure does this as the engine worms up and not when its cold then you need to replace ur inserts and maines.--------------------------------------------------------------------------------ECU Chip Tuning Tool

Have you looked at the gas or gas tank. It could be full of water. Your specific pump could be sitting up high where the gas water line settles after a period of time. Try some dry gas and run the tank out.

Sounds like the wiring is adrift behind the socket ,Now why isnt a probe put up the exhaust to check the emmisions i wonder where the engine is then revved to 2500rpm and the gas analizer read ?

P1351 CHEVROLET - Ignition Coil Control Circuit High VoltageHave the charging system ans the battery tested. O'rielly auto parts and Autozone do this for free.

http://www.autozone.com/autozone/parts/Duralast-Relay-Horn/1996-GMC-Sonoma-2WD/_/N-j5qmvZ9cj6u?itemIdentifier=155154_0_0_ The horn relay is located Front seating area, passenger side, under dash, mounted on support bracket under glove compartment.Click on link to see relay.

maybe a biggr problem depending how long it was hot--cylinderhead damage like warpage or some elctrical part or vacuum hose melted--inspect entire engine for any flaws then test for spark---fuel flow----and compression-------repair manuals are sold for these procedures--------dont let anyone sell u parts till the solution is found

Sounds like it could be the instrument cluster.