can some help me if u can i have loss of power just had the wires, plugs and distributor cap and rotor, coil pack change and runs rough and still no power did this before had this wrk dne as well and has no power to get off hills i dnt see it being the transmission cuz and the trans shifts fine and if it was i wouldn't get nothing i thought the cat but punched that out no difference also thought o2 sensor but i dnt know plz help

 

Did you replace the O2 sensors? If so, what brand?

Have you checked your plenum? Fuel pressure? CEL on?

 

no i haven i trying to get some ideas so i can get it fixed no i didnt replace the o2 sensor and if it was o2 sensor it would throw a code rite when this started no code thrown

 

O2 sensors won't necessarily throw a code. Depends on just how they fail. If they are still sending a signal to the PCM, the PCM doesn't know if it is accurate or not.... PCM only cares if the signal is either NOT there, or, way out of range, or, doesn't "look" right. (not switching rich/lean, etc.) Good test for those is to simply unplug the pre-cat O2 sensors, and take the truck for a drive. That WILL set a code, but, if the truck drives better..... There ya go.

If all your ignition parts are new, and you are STILL running rough.... I would take a long hard look at the plenum, fuel pressure, and possibly the injectors. (start with the easy stuff.... dig deeper if you don't find anything.)

Compression test wouldn't be a bad plan either.

 

MAP sensor?
PCM?
Clogged cat?


Could be anything at this point, especially since you have a 94....yay.

 

ok nw just asken what shuld i do first so im not dumping money and not getting anywhere im not to mechanically enclind can u put in step what i should go about first thx

 

Unplug the O2 sensor, and take it for a ride. Connector is up above the trans, easiest to get to from drivers side, just follow the wires up to the connector.

gonna need a fuel pressure gauge... might be able to rent/borrow one from an auto parts store... I am not entirely sure what pressure on yours is supposed to be... I have heard anywhere from 35, to 49 PSI at idle......

Check those, see what ya find.

 

and i want to say this the loss of power it is there when it is cold but nt as badd when u drive it for a little to warm up i have no power to get off hills it crawls off of them i dnt have any power to even brake torque it

 

Have you checked the air filter?

If worse when it is cold, have you looked at the choke?

Does it do this when you press the gas pedal hard as well as gently, or is it different if you stomp on it?

When was it last running well, and what changed since then?

 

Fuel injected, so, no choke. Possible coolant temp sensor problem though.