87 iroc computer problems please help

[palofval]

I just bought this car it has a new motor the car will start and idle for about 5 seconds sometimes if you toutch the gas at all it will die and if you try to start it with any gas pedal it will not start. I jumped the pins to get the codes and all kind of strange flashes. please help.

[wrightz28]

A- if it's a fuel injected car, pressing the gas pedal shuts off the injectors - no fuel

B - strange flashes are the codes, first one s/b solid, pause, flash flash = 12 'no dist ref', perfectley nomal. This means it's in diagnostic mode, and your cooling fan(s) s/b on. So, you should see 12 three times, then any stored codes afterward. But it sounds as if you have a fuel delivery problem and might not have any (except 12)

[palofval]

Originally Posted by wrightz28

A- if it's a fuel injected car, pressing the gas pedal shuts off the injectors - no fuel

B - strange flashes are the codes, first one s/b solid, pause, flash flash = 12 'no dist ref', perfectley nomal. This means it's in diagnostic mode, and your cooling fan(s) s/b on. So, you should see 12 three times, then any stored codes afterward. But it sounds as if you have a fuel delivery problem and might not have any (except 12)

When i got this car the mass air flo relay and the burn off relay had the wires cut and were melted i fixed the wires and replaced the relays you can here the fule pump running and it is coming up to presure. sence i got your coment back i checked the codes again and a am geting a code 51

[wrightz28]

I beleive 51 is a MAF problem code. Did you clear the ECM after the repair?

[wrightz28]

OK, from what I'm uderstanding, 51 refers to the 5V ecm reference out of range on the ECM circuit somewhere and all sensors are set to default. Again, probably something with the MAF circuit, grounded out maybe? How did you fix the wiring?

[palofval]

Originally Posted by wrightz28

OK, from what I'm uderstanding, 51 refers to the 5V ecm reference out of range on the ECM circuit somewhere and all sensors are set to default. Again, probably something with the MAF circuit, grounded out maybe? How did you fix the wiring?

we have a chiltons cd for the car like i said earler the wires to those relay were in bad shape we cut them back till we had good wire and soldered new wires to the plugs they seem to be working. ther seems to be some confusion on what code 51 is our book says it is bad or improper eprom or computer.

[wrightz28]

Originally Posted by palofval

we had good wire and soldered new wires .

I'm gonna have to let somebody chime in about the soldering aspect of the wiring, something I avoid at all costs. If your cd is year specific, than yes 51 can be a prom failure, but could be because the prom is not in use because everything is in a default mode?

That's my best guess for ya, like I said, somebody else will no doubt chime in if I'm wrong.

[palofval]

Originally Posted by wrightz28

I'm gonna have to let somebody chime in about the soldering aspect of the wiring, something I avoid at all costs. If your cd is year specific, than yes 51 can be a prom failure, but could be because the prom is not in use because everything is in a default mode?

That's my best guess for ya, like I said, somebody else will no doubt chime in if I'm wrong.

thank you you have been helpfull

[palofval]

Originally Posted by palofval

thank you you have been helpfull

just wanted everybody to know I replaced the computer and the car is running now, more work left to do but that problem is fixed now.

[wrightz28]

Sweet, I'm just curious, did you haved the harness conected while soldering, I think that might bve what fried it.

[palofval]

Originally Posted by wrightz28

Sweet, I'm just curious, did you haved the harness conected while soldering, I think that might bve what fried it.

no the computer was out and th batt was disconected. when i got this car these wires were cut and melted.