Question about 1992 Geo Tracker

1 Answer

Hesitation at low rpm

Previous problem was distributor timing. Got a timing light and ignition timing is good, 8 deg BTDC. New problem, at low rpm, it hesitates badly. It was idling high until I set the distributor properly. Now that the distributor is set, it idles fine, but when I put it in gear and give it some gas, it hesitates until the rpm pick up. It sounds like a fuel problem. I'm sure it could use a new fuel filter, but could this be the EGR or the Oxygen sensor? Or maybe the fuel pressure regulator. When the distributor was set too high, there was no hesitation but smelled like it was running rich. Any advice would be welcome.

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  • Geo Master
  • 20,706 Answers

92
which G16 engine, 8valve 16v? black top or silver top
the 16v shouts, electronic EFI on top.

i bet you did classic error #1, never replacing the cam belt
it slips and you see spark timing way off and then retime the distrib.
now its double bad.(wrong)

No tools?
compression, over 150PSI ? wide open throttle time 4?
if that is good the belt has not slipped yet.
the open hood, look up, see that EPA sticker there with spark timing
in clear print, now set the timing using the timing freeze jumper.
to spec. using a real tool called a timing light.
btw, timing never drifts off, unless the belt is bad. or someone guessed.
that is what is first. and fueling is last.
The ECu controls timing all the time, setting it wrong is one of the
biggest lies you can input to any ECU on any car.
it assumes its correct and advances from there. so dont set it wrong.

tell 8v/16v engine and help is 100x better. i promise.

Tbelt
http://www.fixkick.com/t-belt/tbelt-index.html

Dizzy timing, 101
http://www.fixkick.com/IGN_timing/16v-procedure.html

the EGR must not leak or the engine will stall. sitting advance to hide
bad EGR is overthe top wrong.

the tbelt fast test ,
http://www.fixkick.com/t-belt/sneak-a-peek.html

the spark timing freeze jumper
http://www.fixkick.com/IGN_timing/IGN-FREEZE.HTML


bogging.
does it have full power up hills. WOT?
WOT power is 100% ok so........
is the hesitation only for an instant, then recovers.
yes, bad TPS.
or TPS idle switch bad or calibrated wrong.
or needs the 60k mile tuneup. spark /filters /belt (cam)

the bog page. links to all possible

http://www.fixkick.com/power-index.html


is the crank pulley 17mm head bolt , at 94ft/lbs
if not it will mangle the key way fast. end of life , crankshaft.
see TSB on that. on the tbelt pages.

Posted on Apr 02, 2014

  • 3 more comments 
  • Joseph Shinn
    Joseph Shinn Apr 02, 2014

    Okay, full story. Started with blown head gasket. Head went to machine shop for repair. They machined it and replaced valves and guides. I installed new timing belt and tension pulley. It is an interference engine, yes? If timing belt installed incorrectly, I would have had interference with the valves and pistons, yes? Once everything was reassembled, it wouldn't start. Replaced plugs and wires, made small adjustments to the distributor and it started. Got a timing light, and using fixkick.com info, used a paper clip to freeze jump the timing and set it to 8 deg BTDC (I marked the bottom pulley at TDC and the 8 deg mark on the timing cover and they lined up while in idle and while at operating temp. What is the TPS? Hesitation is for an instant, or a bit more than that, and only when I'm giving it significant gas. If I'm just on my flat street, and I just barley push on the gas pedal, there is no hesitation. By the way, this is the 8 valve, 1.6 liter, SOHC.

  • _-__-___-_
    _-__-___-_ Apr 03, 2014

    hey, your on that like tick on a dog. good going. is WOT good, wide open throttle full power up any hill, , normal then the TPS is bad or is maladjusted. the TPS is the the throttle posistion sensor, or throttle angle. , when you move your foot fast, the ECU sees you do that and drops the 02 sensor and goes open loop and then to enrich mode, this prevents the BOG just like on carbs with dead accelerator pump. (the catch up , of power is from the MAP (8v) or the MAF(16v) the TPS has an idle switch, if set to open late, will the ECU will fight your right foot. so there are 2 ways for the TPS to case this. the switch set wrong, or the Throttle angle pin going dead. called TP pin. i still dont know which motor it is.. 8v or 16v (apples or oranges)

  • _-__-___-_
    _-__-___-_ Apr 03, 2014

    case= cause. The TPS, is a very imporant sensor. A feeler gauge sets it easy. all TPS die, when the carbon resistor in side, goes bad. and cause a glitch as you move your right foot. The ecu even measure the rate you move said foot, and goes richer. (more power) . wish i knew what engine you have. http://www.fixkick.com/sensors/tests/TPS...

  • _-__-___-_
    _-__-___-_ Apr 03, 2014

    black top engine or silver.

  • _-__-___-_
    _-__-___-_ Apr 03, 2014

    if 16v, clean the maf, if 8v make sure the map hose is not bad. and CEL lamp off running.

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