Question about 1992 Geo Tracker

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92 geo tracker starts fine then during idle it sputters out unless I pump the gas. If I run it to 3000 rpm it seems ok, but anything under it dies. Changed fuel filter. Fuel pump hums so don't think

Not really sure what else to do.

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  • Geo Master
  • 20,706 Answers

What engine, 16valves, or 8valves. silver top or black?
MPI or TBI engine. they sold both and are vastly different.
hums dont mean a thing, only that the pump can make noise.
pressure rules (and flow #1)
ive personally fixed every fail possible on these, stalls.
owned many and fixed more. (own 3 and restored them to 100% )
unfortunately this older car is not OBD2 level ECU/PCM.
so no scan tools work.
Ever give it a tune up.? at the 60k mile interval.? repeats?
1: spare parts, both filters. and timing belt?
2: EGR ,main loves to stick open if it does engine will stall.
starts fine , yes
does engine get to 180F coolant temp and hold? if not fix that first.
is engine idle at 800RPM, hot? y/n? if yes, EGR is not stuck open.
if lower, EGR stuck. or other probs.
not knowing which engine makes answers hard, and only generic.
not knowing the transmission option too, makes it hard. 3,4,5speed.?
the 3sp can have vacuum leaks that can be real bad for the 16v engine, see? see how the work together? or not?
3: bad TPS.
stalling happens for 2 reasons (not counting bad engine)
the ECU (engine EFI brain, puter. etc) does all it can to stop stalls
it has 2 slaves to do that. one is ISC other is spark timing.
when stalls happens this is a warning that the ISC is bad,
or is overloaded.
A: MISFIRE. Gross.( 50 reasons, but can be to rich or just needs a tuneup.)
B: bogging . Gross (too lean, or called fuel starvation)
my questions.
does hot idle run at 800 all the time. RPM.
does engine have full power on hills.
does engine stall coming up to traffic stops (EGR malf)
does the lost power. recover, with just holding throttle down? only?
can you tell the difference from bog and misfire.
bog is lack of power, its smooth
misfire is violent, it shacks the motor. does it?
when you pump the throttle, this engages ENRICH mode
in the ECU , and overrides lean,.
my guess, (cant drive it and if could , i can tell whats going on)
but based on your inputs, it say its lean.
if power is low on hills, i then.
grab my fuel pressure gauge. $20
i do this at every fuel filter change, since im THERE already
it has a test port, a 6mm plug.
i take this hose and check for 30psi,
see why guess here.
34 to 36PSI, key on, 3 times, (both engines, not stated, so..)
see the tool here,for next to nothing. costs.
http://www.fixkick.com/INJECTORS/pump.html

the EFI totally can no work at 20 PSI or hums.
it must be at leas 34psi.
below 28 the injectors fail. (read injector spec, and see that)
if the pressure is good there is hope.

post engine type, 4 injectors or 1.
and can go way deeper and more accurate.

bogging is here
http://www.fixkick.com/power-index.html

Posted on Apr 01, 2014

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Related Questions:

1 Answer

1995 geo tracker sputters and stalls and wont idle


need more input. (8valve or 16valve engine , which option?)
black top engine , or silver 16)?
does it fail, cold or hot engine or both?
does it have full power from engine , at all speeds and loads (hills)?
and wide open throttle power.?
ever do the 60k tune up, not just a fuel filter?
http://www.fixkick.com/IGN_timing/tune-ups.html

how old is the fuel?
the pump/reg holds 34-43 psi.at all times...running.
sputter, from too low RPM ? below 800
or idle fast, but sputters at 800 and more?
if the latter, that is called misfire.
if the former that is lost of idle controls.
need to now which engine. because the are worlds apart.
EFI wise !

but here is a page on misfire. "sputter"
50 reaons and more causes.
we dont guess, we do about 5 tests and bingo....

http://www.fixkick.com/misfiring.html


when was the last time it ran good,?

Jan 16, 2014 | 1995 Geo Tracker

1 Answer

1995 geo tracker sputters and stalls


Have you checked fuel pressure ?

Jan 16, 2014 | Cars & Trucks

1 Answer

1995 geo tracker .. when start the truck it idles at 3000 rpm and when shifting between gears it idles high at 3000 rpm .. it randomly started this but i also noticed when it started doing that my lighter...


Hello,
I doubt it has anything to do with your lighter/aux, but change the fuse on it and see if that corrects the problem. Check to see if you can pull the gas pedal back with your hand and see if that lowers the RPM. Old cars can wear the parts that make your pedal rise fully back up.
There is also the intake adjustment screw near where your intake meets the manifold. It's usually a phillip's screw. This will lower or raise your RPM levels on idle. You may have to adjust the screw. Every time you make 1/4 turn adjustments, you need to let the car run for awhile as the process is gradual and NOT immediate. This is the steps I would take because I know my cars, but if you feel uncertain, please take it to a mechanic. Best of Luck!

Feb 17, 2011 | 1995 Geo Tracker

1 Answer

Sometimes when the engine is cold my 98 accord sputters and dies when started. I turn it over again and it starts up fine. When I drive it is OK unless I push the pedal to the floor - then it does...


change the fuel filter. Then check the fuel pump pressure at idle and at 3000 rpm. A fuel pressure regulator stuck in the idle setting will show those symptoms but so will a partially clogged filter.

Jan 29, 2011 | 1998 Honda Accord

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4.3 L will not idel


check the Idle Stop Solenoid

May 22, 2010 | 1992 GMC Safari

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92 geo tracker wont start replaced gas pump fuel injector relays i can soray starter fluid in the carb and it will start right up but wont run


CHECK FUEL PUMP FUSE.AND CHECK IGNITION TIMING ALSO SCAN IT TO MAKE PCM IS GOOD.FUEL PUMP WONT TURN ON IF PCM OR ECM FAULTY.

Mar 17, 2010 | 1992 Geo Tracker

1 Answer

When i start my 92 geo tracker, it starts fine but about 5 seconds later, the idle drops significantly. enough so, that the car sometimes (usually) stalls and i have to restart it. it also stalls...


this is cause because the ISC is busted or can not open enough to keep idle at 800 rpm.

ISC , idle speed controller

but....
the car has a TPS switch on the throttle body.
if it fails to close at idle the ecu will never attempt to set idle.

or
car could be flooding. (too much gas)

you did not say if motor is 8valve or 16v and they are quite different EFI systems.


Feb 19, 2009 | 1992 Geo Tracker

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