Question about 1999 Isuzu Trooper

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Why my engine is running rough - 1999 Isuzu Trooper

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Which engine, must we guess that ,?
is it gasoline? or diesel?
engine?
my poor buddy down street has this stinking, isuzu, (Yugo like)
and has (has 2nd one is parked in field rusting away 1987 carb shot)
but this 99 , runs bad too.,
why?
well it's old (16 years )
and he never ever tunes up his cars, then wonders why it runs bad. (oldest story on earth on cars)
I walk over and gee the spark plugs are bad. and filters packed.
his is the older SOHC v6. (single cam heads)

the rough running means MISFIRE
I take my scan tool and shows P0306, hard failure.
and that is #6 misfiring (can be spark , fueling or compression)
i pull #6 spark plug (owner thinks it's a bolt and all bolts same)
it's black as coal, and the gap is like hat rim size.
others look same.
hummm could this be it , I ask him,
50 more stories of misfire. endless.....
like green tip spark plugs. (antifreeze)
or injector coil open.
or 25psi compression on #6



dah line up.....
3.2 L 6VD1 SOHC V6
3.2 L 6VD1 DOHC V6
3.5 L 6VE1 DOHC V6
3.0 L 4JX1 TD I4 diesel T= turbo
3.1 L 4JG2 TD I4 "

Posted on Nov 07, 2015

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Running rough at all speeds ? Hot and cold ?

Posted on Nov 05, 2015

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When last you service the engine,check your spark plugs and if it not running on all look at the set its not running on and check and see if any wet with gas if they are or if they black change them

Posted on Nov 05, 2015

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Posted on Jan 02, 2017

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Check the attached links,instruction and guides on diagnosing rough running engine. Good luck
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I have a 1995 Mercedes Benz SL 500 that runs rough when started after sitting for several days.


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The Common Problem: Rough Running Engine

A properly-operating engine should run smoothly and without excess noise. If your engine starts operating in a manner that gives you the perception of "running rough", it is likely due to a handful of common causes. A mechanic would investigate these common causes first in order to rule out a simple explanation for the engine's unsatisfactory operation.
The common causes for rough running in an engine are:
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-------
van idles rough? http://howtobyme.blogspot.in/2012/01/2004-ford-freestar-van-idles-rough.html

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Here is a list of possible causes. You should not drive the vehicle if the check engine light is flashing all the time, you can cause even more damage. It could pay to have a professional find the real cause.

Spark plugs that are incorrect for the application, cracked, improperly gaped or worn can cause the engine to misfire or run rough at all times.
An IC module that failed to correctly control the ignition coil(s) will cause the engine to misfire or run rough at all times.
Poor connections, broken wiring or wiring that has shorts to ground can cause the engine to misfire or run rough at all times. NOTE: Check connectors that might be pulled apart as the engine flexes or wires that short to ground as they pass near brackets or shorts to ground on the exhaust manifold.
Fuel injector(s) that are shorted, plugged or partially restricted can cause the engine to misfire or run rough at all times.
An ignition coil(s) that has low output, corrosion on the coil tower(s), is carbon tracked or arcs to ground will cause the engine to misfire or run rough at all times.
A PCM that failed to properly control the injector or ignition timing will cause the engine to misfire or run rough at all times.

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