vortec 4.3l 93 blazer
 

hi i have a 1993 blazer with a vortec 4.3 runs good when cold but as soon as it warms up it spits and spudders when hard on the gas motor sound good at idle just not gasing when warm anyone have any ideas to what might be wrong

RE: vortec 4.3l 93 blazer
 

any codes?

i'm inclined to think it might be the coolant temperature sensor. when was the last time you did a tuneup? new plugs, wires, cap and rotor, etc.

RE: vortec 4.3l 93 blazer
 

havent done a tune up yet just got it i was wondering about senser be cause it will stay saying hot sometimes when you first start it but when it dont seems to run good till it starts showing hot but never boils over not real sure its getting hot

RE: vortec 4.3l 93 blazer
 

check for codes, check the coolant temperature sensor. do a tuneup and replace the thermostat and radiator cap. might want to replace the fuel filter and run a couple bottles of fuel system cleaner through if that doesn't help.

RE: vortec 4.3l 93 blazer
 

fuel filter was changed so was fuel pump also spray carb cleaner in it clears out for a min than back to same old time spitting and spuddering does the temp sensor send measage to computer to change fuel mix maybe dont know much about these newer cars

RE: vortec 4.3l 93 blazer
 

in a roundabout way, yes.

RE: vortec 4.3l 93 blazer
 

do have some codes now #22,23,34 does anyone have an idea whats wrong

RE: vortec 4.3l 93 blazer
 

I think 34 is the one causeing your problems.....unless my book is wrong 34= MAP(manifold air pressure) sensor.....you can unplug it and plug the vaccum hose to test it.....but 22= tps(throttle position sensor) and 23= IAT(intake air temp)....but my money would be on either the map or the tps......good luck and let us know how it turns out

RE: vortec 4.3l 93 blazer
 

The puter takes the info from various sensors, including the MAF/MAP sensor to control engine performance. IT will vary the IAC (idle air control). The IAC operates until the engine is warm. The temp sensor tells the puter the engine is warm. The TPS will tell the puter where the butterflies are and how much trottle you are giving it. It takes that info and the MAF/MAP info and adjusts the timing and fuel injector spray duration to control the air/fuel mix ratio to 14.9:1.

My money is on the temp sensor. Replace it and make sure the wires are in good shape, no bare wire showing.