I have an 87 TPI/5spd car. The car was converted to Speed Density by me. I made an adapter to plug into the factory harness. I removed the entire Harness this past winter to cut out the MAF plugs and all emissions/ac plugs also. While doing this I cleaned up the exsisting wiring and retaped everything. I used some of the old emissions wiring through the harness for MAP wiring.

I did the conversion at first with just the adapter and a drilled hole in the firewall for the seperate MAP wiring. The car ran ok, after the Harness gutting and cleaning up I have noticed a couple of small problems.

1. The MAP KPA never gets to 100kpa on diacom with the key turned forward and linked up. I have tried SEVERAL cars, a s10 with a 4.3TBI engine and a s10 with a 305 TPI motor and a 92z28, all of them are speed density and show the 100KPA MAP value, I have tried other MAP sensors , even from those vehicles to determine if mine had a problem, no help. Mine reads about 98KPA. I'm wondering if the wiring I used from the emissions equipment has some interference from another device? or if there is a short or open somewhere.

2. The other problem after the gutting of the harness is that the fuel pump will NOT shut off for about 1 minute after just starting the car. I fire it up, let it run for a few minutes and then shut it off. The pump just continues to run. I did not do this before the gutting.


Any comments or suggestions would be a great help,

Thanks,
Brendan

 

Try unplugging the oil pressure switch and see if the pump then stops as soon as you shut off the engine. If it does, then that's what's keeping it running on after you shut if off.

I do understand that it shuts off, it just take awhile, right?

 

Yes it takes awhile. Think its the oil pressure bleeding off?

It doesn't do it after the pump has ran more than 15minutes or the car is warmed up though???