I have an 1988 chevy celebrity 2.8. while driving, it will just all of a sudden lose power kinda like turning off the key and back on i have replaced ignition module, plugs and wires, mass air flow, map sensor and smacked the ptm and even looked over the wire loom. what could it be? and replaced the throttle ps.

i have tried and it absolutely will not read anything, not even when u first plug it in. you know when u plug it in to the car it tells you yo turn ignition on and to hit the green button? it don't even do that. i've even plugged it in to another car just to see if it works and it works just fine. im thinking it's a short but pulled all the wires out of the wire loom and found nothing. Now the comment you made about the lose'n power from the battery sounds like a good direction to look but then again the car turns over just fine. It acts as if the ignition modual is shorting out but he has replaced that, fuel filter crank sensor, maf, and map. maybe the cam position sensor??? would that cause it to cut in and out like that? i have tried and it absolutely will not read anything, not even when u first plug it in. you know when u plug it in to the car it tells you yo turn ignition on and to hit the green button? it don't even do that. i've even plugged it in to another car just to see if it works and it works just fine. im thinking it's a short but pulled all the wires out of the wire loom and found nothing. Now the comment you made about the lose'n power from the battery sounds like a good direction to look but then again the car turns over just fine. It acts as if the ignition modual is shorting out but he has replaced that, fuel filter crank sensor, maf, and map. maybe the cam position sensor??? would that cause it to cut in and out like that?

Hi Charlie, Now we're getting somewhere! Check the connections into the ECU, keeping in mind there is the ignition live and a constant live, Make sure the plugs and sockets are all making good contact and then check the earthing cables from the ECU. I believe you'll find a bad earth somewhere along the circuits so pay special attention there. I would not be very surprised if some of the earthing connections have become rusted and are making poor contact. Keep in mind the vehicle is more than thirty years old so you shouldn't complain if it has rusted a little. Regards John Hi Charlie, Now we're getting somewhere! Check the connections into the ECU, keeping in mind there is the ignition live and a constant live, Make sure the plugs and sockets are all making good contact and then check the earthing cables from the ECU. I believe you'll find a bad earth somewhere along the circuits so pay special attention there. I would not be very surprised if some of the earthing connections have become rusted and are making poor contact. Keep in mind the vehicle is more than thirty years old so you shouldn't complain if it has rusted a little. Regards John