engine shut down

have you checked the idle air control its a small motor on the side of the throlle body

Idle works perfectly normal when engine is warmed up or if it is already warm outside. Would idle control motor still be suspect?

(forgot my password) threw a rod in my engine of a 94 sonoma 4.3 v6 vortech....Swapped the engine block that came from a 97 jimmy 4x4 4.3 v6 vortech ...All components from 94 block where put onto the 97 block.....truck would start up an run for a couple seconds and shut off.... it keeps repeating the process everytime....I've changed the throttle body kit and the fuel pump and its still shutting off.... Spark plugs are firing well and fuel is being sent in properly but the truck won't stay on. your thoughts?

scan for codes and check fuelpressure first. if tbi check for blown gasket uner tbi unit. check hose to map sensor for soft as it may be sucking closed and not letting map work.recheck all electrical hookups. and check for a vacuum leak.

Scanned for codes and nothing came up....fuel pressure is between 13-15.replaced the throttle body rebuild kit..all electrical is good.... I Will check the map sensor and vacuum for leaks... Where is the map sensor located?

should be on the firewall right behind motor or by coil

I checked all the vacuum lines and there are no leaks in the lines... However I'm still not certain about the map sensor location....i see no hose leading up to the firewall .... All i see is a hose going from the intake going along the firewall

My engine cuts off when I put the truck in gear or while foot is on the brake to shift into gear it seem like it might be the fuel injectors / all the lights in my dash come on just before the truck stalls out then it's hard to start again I thought it could be a short but I pulled the dash off and couldn't find any loose or broken wires any suggestions.

Try cleaning out the idle air control valve and test the throttle position sensor and manifold absolute pressure sensor.

next time let us know if it's atbi unit or cpi it makes a difference in sensor locations. see pic

I have no idea about atbi or cpi and I'm really not a mechanic just trying this out... I do know that i have a VIN (Z) series and the diagram you sent me differs from what i'm seeing

ok this should be right and it shold be the same or very similar with a stick or auto

I'm not certain that that's the one either....i have a automatic as well

threw a rod in the 94 4.3 v6 vortech engine... i've changed the engine block by using a 97 jimmy 4x4 4.3 v6 engine block... i put all the original components from the 94 block onto the 97 block.. when i start the truck up it just runs for a couple seconds and shuts off... what are your thoughts on this matter? I've already changed the fuel pump as well.

When it shuts down does it restart? and repeat process? can you determine what is shuting off spark or fuel? So the block is all that was used intake, injection dist ect all off 94?

if you look at the right it says vin z a/t meaning auto trans. have a pro look at this for you he'll straighten it out.I have no further suggestions.

I found the sensor thanks... I cleaned it up turned the key and it runs yes i.....thank you very much fir the talk through process.... Now my problem is it sounds like my starter is binding object my fly wheel a bit....I've tried it with 1 shim then 2 shims and without shims and it's no different...any suggestions to that? And thanks again

probably has the wrong flywheel on it or the starter may be going bad.

It's the fly wheel from my old block that threw the rod so i'm guessing that it is the starter

Starts fine and idles good when you start to give it gas it cuts out and sputters gets worse as you go and then dies but starts right up again. Put in new cat and fuel filter had new fuel pump put in 2 years ago.

Did you use a gage and check fuel pressure? The vin Z engine is tbi fuel injection, 9--13 psi.
The vin w is the spider fuel system, our info says 54--64 psi. Which one do you have?

How long since overall tune-up? Can you check applicable trouble codes? If your fully obd1 compliant, you can use a jumper wire between the A & B terminals at datalink connector. Turn key just till the dash lites come on, no further. Then the ses lamp on the dash starts flashing, you count the flashes to get the codes. Your looking for two digit codes.

trouble shooting S-15 1994 trottle body problems

idles however when gas is given - engine wants to stall out.

Check and test the throttle position sensor,manifold absolute pressure sensor,knock sensor and EGR valve to include a fuel pressure check