aode08

working on 1991 gt, car hauls cold and 35 mins, after that, sluggs, feels like 20 hp loss, customer replaced

o2's coil pack and fuel filter, pressure ok checked cold, im assuming the dizzy or fuel pump is at fault, no codes.




new plugs, wires, cap and rotoe button, and misses somewhat as well. ran inj cleaner 2 [:'(]

no cats

shaners90lxhatch

Possible loss of fuel pressure volume. You pressure may remain good but you can loose adequate volume but have good pressure. The best thing to do is to monitor your oxygen sensor voltage under hard accel. Backprobing the proper PCM pin (43 for passenger bank, 44 for driver's bank) with a voltmeter will be the easiest way to do this. You want those suckers pegged rich under hard accel (.8-.9v). If they climb to almost a volt and then begin to come down as load and RPM increases, you have a clogged filter, resistance in pump circuits, pinched line, junk in the tank, bad pump, et cetera. I will look at my wiring diagram later and make sure those pin numbers are correct but I am 90% sure they are.

LX 5.0

Sounds normal. I also felt a substancial difference in power regarding the engion temp. I love driving on those cool fall days!

92hatchLX

I dunno what would cause power when you go into open loop.

aode08

i know the engine likes cold fuel, cold everything lol.


looking inside his tank, the fuel pump is crust stained red, so is his dizzy


all wiring and ground RESISTANCE CHECKS POSSIBLE COMPLETE.a higher volume will help him,