This car EFI, or CARB, ill toss COIN, EFI gas.
what 4 cylinder, name it there are 7 used.
I'll now toss my coin land on GAS 4 cylinder engine. (in usa?)
is it racing too fast hot
or RPM too low hot.?
we cant guess what your statement above means.
but
the exhaust manifold cracks will cause the 02 oxy sensors to LIE,
to go lean (0volts ) this cause the fuel injection
to go RICH, (cause and effect closed loop rules)
and can idle too slow. (see that word SLOW)
the wrong word you used, after reading this vast times.
"NOT idle at very low rpms"
i decode this to mean?
NOt idle at proper low RPM (800 hot)
or spec 800 rpm , is more clear
that means the idle races hot.
this word is in all books on cars. engine RACES
IF true RACES it's not :
the exhaust crack, but can be if engine EFI slams in to limphome mode, do the flash codes show 12?
you never did those did you , bad idea skipping that. Google isuzu diagnostic jumper and read.
it's not he fuel tank ever,. not RACING.
what can cause any map based engine to race
well frankly LOTS:
but can be reduced to: (physics +)
1: throttle cables jammed. no slack. bad.
2: throttle valve jammed (gunk below it does that)(in the throttle body)
3: all vacuum leaks, (put huge list here, ask)
4: ISC or ICA valves stuck open
5: engine not reaching and holding 180f will cause #4 above to fail, naturally. bad thermostat. cause.
6: someone hacked your TB. (ask)
TB = throttle body.
vacuum leaks is an all day wall of text post
i refuse. but do have links to them.
what engine, gas or diesel
and what size, we cant guess engines ever
if in usa we can reduce,, gut guessing really does sux.
is it a diesel
why must we ask ?
here they all are,
tell us now which 4 banger, first.
are you in USA?
7, 4 banger's
every one wants help
few know what's under the hood
why? nor states country to lower the list.
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SOURCE: 88 Isuzu truck (4 cyl) has terrible idle/black exhaust
did you check for vacuum leaks probably a vacuum hose thats been knocked off or eroded and needs to be replaced.
SOURCE: idle issues
I had the same problem and when I change the catalytic converter the problem was solve !
SOURCE: Shake/Shudder while depressing the brake.
I just changed the brake pads and rotors on my father's 2001 Trooper that he recently purchased because they were shaking just like your were. He bought it from a mechanic shop and they had put new pads on it but it needed new rotors as well. If there is noticable groving on the rotors and new pads are installed it can create shaking, sometimes severe, when the brakes are applied. It sounds like this is what has happened with your vehicle as well. That being said, I don't consider it a huge safety issue to drive it until you get it fixed, just know that your braking will not be optimal and that it will take you longer to stop than if the brakes were working properly. All that being said, get them fixed ASAP so you don't have to worry about it. Who wants to mess with safety right? Good luck, hope this helps!
SOURCE: Rough idle engine ticking
check for a lose spark plug lead or cracked elecrod insulation on spark plug
it could be the problem but id also look into the tps sensor thats if it has on since its an older vehicle
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