ok automatics
hot engine, is 800 rpm
you shift to drive
rpm holds a 800. the ISC and ecu idle regulation servos do that. magic.
http://www.fixkick.com/CEL/CEL.html#OBD1codes
got 12 codes. its ok to even drive like that, flashing 12s,
usually it only changes for sensors fell off. its crude but worth looking.
15mpg?
not flashing 12s
02 bad, or ehxaust leaks to it, even new stuff, here can leak if not setup right. (cracks or on new system bad gasket near by)
fuel pressure not spec, running. 34-41psi , (changes by altitude.) lower psi at higher elevations.
injector leaks fuel (watch it at instant key off running, it must halt inject in same instant)
ECT reads wrong, or its wires fell off
02 heater dead.
wrong 02.
its not vacuum leaks, nor idle wrong. (although idle wrong is a clue to other things wrong)
is it misfiring?
are the spark tips black or fuel soaked.
maf dead, and ecu in failsafe due this .
there are other fail safe failures. using the jumper clip finds most.
hot engine, is 800 rpm
you shift to drive
rpm holds a 800. the ISC and ecu idle regulation servos do that. magic.
http://www.fixkick.com/CEL/CEL.html#OBD1codes
got 12 codes. its ok to even drive like that, flashing 12s,
usually it only changes for sensors fell off. its crude but worth looking.
15mpg?
not flashing 12s
02 bad, or ehxaust leaks to it, even new stuff, here can leak if not setup right. (cracks or on new system bad gasket near by)
fuel pressure not spec, running. 34-41psi , (changes by altitude.) lower psi at higher elevations.
injector leaks fuel (watch it at instant key off running, it must halt inject in same instant)
ECT reads wrong, or its wires fell off
02 heater dead.
wrong 02.
its not vacuum leaks, nor idle wrong. (although idle wrong is a clue to other things wrong)
is it misfiring?
are the spark tips black or fuel soaked.
maf dead, and ecu in failsafe due this .
there are other fail safe failures. using the jumper clip finds most.
http://www.fixkick.com