Question about 1990 Ford Tempo

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Starts fine, when accelerator is press car will run but bog or lag power, changed plugs, still . Im guessing mabey fuel injector prob?

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  • Ford Master
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Well, fueling is part of the many systems that you need to investigate. But hard to imagine much wrong if you idle reasonably....Do check or just replace the fuel filter.

From there, the possibilities are massive. Consider paying for a diagnostic at a local shop.

Posted on Oct 09, 2010

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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


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

Mar 31, 2014 | 1992 Geo Tracker

1 Answer

95 GMC Seirria W/5.7 bogs or struglles under heavy acceleration.


if it is not down shifting when you are applying aggressive gas pedal, maybe your transmission linkage to throttle body is off, or needs adjusted,

Mar 23, 2013 | 1995 GMC Sierra

1 Answer

I have a 1996 2.5 liter Dodge dakota that will turn over but not


im assuming youve done basic tune up of plugs, wires, air and fuel filters, oil, distributor if applicable (im guessing not but never owned a dodge)

if it bogs down/stalls at stops only when its hot, try a new egr valve. probably getting stuck open. if not that try heavier oil to see if its losing compression, just one step up. also,

if it runs ok after clearing the computer by disconnecting the battery for a while, probably a dying sensor (most likely o2)

if after clearing computer it still runs bad after warm up, see if it bogs down really bad when letting it warm up from cold without driving (just idle to make sure its not egr system). if it dies or sounds like its close to dead, then its probably something fuel related (clogged/faulty injector, worn fuel pump, bad pump relay)

hope it helps

Jul 28, 2009 | 1992 Honda Accord

2 Answers

My 1997 millennia S stumbles when you accelerate quickly


Hello. How many miles are on the vehical? Have you ever had, or changed the fuel filter(s)? . The spark plugs and wires? I recommend a quality tune up first to eliminate any small issues. Quinn, Arizona

Jul 25, 2009 | 1997 Mazda Millenia

1 Answer

Racecar Motor Bogging on Acceleration


try checking fuel pump presure & delivery
id say its starving or has a blockage
im in AUSTARLIA mate so i dont know the engine but doesnt matterif its efi you may need bigger injectors aswell
if carbs try re jetting
CHEERS

Jul 17, 2009 | 1993 Chevrolet Beretta

1 Answer

88 GMC S15 starting plus other problems


REplace the fuel filter, then check for vaccum leakes around the intake. My guess is the carb it close to falling off! LOL Frankster016

Dec 07, 2008 | 1988 GMC S-15

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