Question about 1995 GMC Safari

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Running rich and lean

I have a 95 GMC Safari with a 4.3. It's been running rough, seems to be missing. I've replaced the plugs, plug wires, cap, rotor, O2 sensor, and spider injector. Nothing has changed.

I'm getting two trouble codes (which prompted me to change the o2 sensor) 44 and 45. 44 indicates it's running lean, and 45 indicates it's running rich.

This problem has me stumped.

Posted by on

  • fierce panda Oct 02, 2008

    my truck starts ok, runs for the first minute then it seems like its being starved of fuel, then its ok for a bit, this happens on petrol and lpg fuels alike, what is it

  • Anonymous Mar 27, 2014

    sets a code 45 then starts running smoothly

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  • 113 Answers

The codes ur getting will be thrown by a vacume leak make sure u dont have a vacume line leaking or split also check ur pcv valve for clogging

Posted on Jun 18, 2008

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Posted on Jan 02, 2017

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1999 GMC Safari, rough running, knock detonation at wide open throttle


It seems like a problem with your ignition system. You could take a look under the hood at night / in the dark to see if there are any sparks between the spark plug wires and anything they touch or lay close to.
As the engine needs to be running during this test, please watch out not to touch any moving parts as it might lead to severe injury.

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Check engine light is on, emmissions said o2 sensor out replaced sensor replaced plugs,rotor ,cap and wires still idels rough and floods


95 16v ?
what DTC, post DTC? why skip that,... there are many 02 DTC.
most fail for heater, dead,
lets play a game. say;
1: CEL out running, is it , now?
2: you did the 60k by the book, did you? if not why not?
3: checked spark timing, its good, not way off, is it?
the 60k requires a new Timing belt, ever check that, or the timing of the cam? or compression, if not why not.?
no motor can run right with all or any of those stated items bad.
is the fuel filter packed up. 60k.
lets now pretend the 60k was done and done right.
click 60k here
http://www.fixkick.com/IGN_timing/tune-ups.html

"what can make my 95 very rich?,"
Ill pretend it's a MPI 16v engine, not TBI. big differences that.
The 16v has 4 injectors, quad trouble !
rich? you never said under what conditions, hot or cold?
ill pretend, its all the time. rich. not just cold or hot.
1: engine never reaches 180F and holds there (miniumum)
does it? if not it will run rich forever. the ECU thinks its cold all the time and guess what it is.
2: Exhaust cracks, near the 02 sensors, making said sensor useless (new or old)
3: fuel pressure not near 30psi ($20 gage) found at 60. opps. bad.
4: leaking injectors.
5: clogged injectors, (seems odd but is true) ask.(complex)
there is an order to finding this.
ask for detailed help here, totally free.
http://www.fixkick.com/bbs2/Suzuki-bbs/

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