I have a 90 geo prizm I have changed the plugs ignition control module fuel pump and fuel filter the car runs for a few minutes till at normal temp then shuts down when put it in gear any suggestions
wow , year, body name Prizm stated, Prizm is a TOY corolla.
but not the engine, or trans.
my wild guess this is the TOY 4aFE engine. 1990
i have 50 guesses for you, would you like me to toss dice and spit one out? or would you like to try real diagnosis.?
using real tools, lacking tools, its impossible to do this.
sorry. EFI systems and ENGINES are complex with huge numbers of failures, possible.
sounds like an auto trans there, shifting from Park to drive..
Best is to say DRIVE,
and when you do that a huge load is put on the engine.
and if its stalls its cause by 1 of 2 reasons.
idle controls dead;
or engine is weak.
so if you use the fast right foot trick you lean which it is.
is engine rpm at spec, hot ?
is engine rpm at 800 or more in park.
when you shift to drive, the rpm most hold at 800.
if not the engine is weak for sure if the fast right foot cant make car move.
if the trick above works, i can drive using the fast foot trick, then we do idle speed controls tests.
if not (its misfire, caused weak engine)
the engine is weak, top reason misfire or under injected.
under injected is lean and bogging engine, and stalls.
the 50 other causes. starts now. or up to 10 more tests.
idle cold ok, no misfiring? or engine shaking
can you drive it dead cold???????????????
then are you saying only the hot engine , shifted to drive
causes a stall but not driving a cold engine>?
if all that is true, then use the hot right foot, happy foot.
you foot can in fact bypass the idle controls of all EFI engines made (gas).
This trick adds air and the ECU adds fuel matching your added air.
see how this magic works.?
so does it work. this trick.? i can drive now it a happy right toe?
THE key answer, to diagnosis.
and if you hear /feel or see misfire, that too is key and no blind net bunny can see this.
it must be seen and reported.
spark plugs gaped to spec>/? not guessing?
new spark plug wires, on a car this old the original are all DOA.
compression at 150PSI or more , at sea-level to 1000'feet.
if not , say so, and the readings as WOT. (open the throttle to do compression tests are its all just a wasted effort)
cap and rotor new, (26year old parts here are junk)
also battery voltage need to be 13.3v to 15vdc running.
if not ?and the alternator is dead, the voltage drops and EFI stalls the engine, so we always check system main voltage on all cars the run bad, and fuses.
we also check fuel pressure ! on all engine that flood or bog.
and the flash codes, (magic 1990 jumper clip flash codes)
Apr 25, 2016 |
Geo Cars & Trucks