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Isuzu Trooper Engine Misfire
Last post on Aug 14, 2011 at 9:57 AM
You are in the Isuzu Trooper
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Isuzu Trooper, Isuzu Trooper II, Electrical, Engine, Exhaust, SUV
#9 of 38 engine misfire
Feb 16, 2008 (3:44 pm)
I've had an ongoing problem with the engine having a intermittant misfire, i have cleaned the egr valve and tube, replaced 2 O2 sensors, replaced spark plugs, replaced 1 coil pack, and all tube and valve cover gaskets, but my problem persists. I'm now noticing a rusty oily material in the spark plug tubes. It appears as though the oil and water conbined and evaporated in the tube. I was thinking head gasket, but it seems to me the gasket should not be involve in the spark plug tube, so now i am at a loss. the codes read misfire # 4 cylinder and i replaced that spark plug. Any suggestion would be a good suggestion at this point
#10 of 38 Re: engine misfire [mdenman1]
Feb 16, 2008 (5:15 pm)
What engine are you having this problem with? Generally, I have only heard of antifreeze in the spark plug tubes when the head is cracked. It does happen but pretty rare. More likely the spark plug wire tube seals are letting moisture in. How about spark plug wires.....how old and what condition are they? They may look OK, but age and use can cause their conductance to deteriorate.
HTH One guys opinion.
#11 of 38 Re: engine misfire [atfdmike]
Feb 16, 2008 (10:06 pm)
Your opinion for mdenman may be right on mine. My 3.2 sohc is stalling, huffing and puffing clouds of black smoke intermitenty. The wires are old. When I pulled one, the seal stayed on the plug. The tube came out though, but the plug could not be removed. Any ideas on how to get that seal off the plug would be helpful.
The 5 plugs are still out and I haven't tried to restart it since I replaced the o2 sensor.
Also, where is the connector for the code reader ( i looked )and the location of the crank sensor?
#12 of 38 Re: engine misfire [atfdmike]
Feb 17, 2008 (8:49 pm)
I'm sorry my trooper is a 1999, there are no plug wires and each cyclinder has a coil pack, the liquid is water/oil mixture and maybe condensation could be part of the problem, i have bought a new coil pack and replaced the old one but still have the problem. Also can anyone tell me how to change my email address? I just switched to comcast and my address has changed
#13 of 38 Re: engine misfire [mdenman1]
by steve_ HOST
Feb 17, 2008 (8:51 pm)
If you go to Forum Profile on the upper right, there's a tab for Change Email/Password.
#14 of 38 Re: engine misfire [landfill]
Feb 18, 2008 (4:03 am)
A trick that works when you have a sticky boot is to take an air nozzle and blow air into the be while pulling on the boot with a twisting motion. When reinstalling, apply a dielectric grease to the boot end where it fits over the plug. That will insure it does not stick again. Most parts stores have the grease.
Early Troopers had the plug tucked behind console where it meets the dash. Carpet may be over it. Later Troopers had it in the LH kick panel behind the trim. Try a search, may help on both questions. Include your year, model and trans when posting, makes it easier to be specific good luck.
#15 of 38 Re: engine misfire [mdenman1]
Feb 18, 2008 (4:13 am)
The new pack pretty much rules out the coil or wire being the problem. Have you had the codes read.....there are codes that set that don't trigger the CEL to come on. Even a momentary code will generally be stored for a period of time. I am not too familiar with the ignitions setup on the newer trooprs. Try having the codes scanned at a parts store that does it for free to make sure no surprises. If none, check compression on that cylinder and a couple others to see if low compression is problem. Good luck.
#16 of 38 engine misfire
Feb 19, 2008 (5:37 am)
The problem continues, last night i swapped out the coil pack again, and had the cel codes re checked at autozone i had three codes; 1171 (lean mixture during acceleration), 0157 (O2 sensor bank 2 sensor 2) and 0304 (misfire #4 cyclinder) I'm beginning to think i may have a problem with my fuel injector on cyclinder 4. Does anyone have any thoughts, I've no heard of any problems with that part. It doesn't seem that difficult to take off and check, or replace for that matter. The first two codes are a result of a cyclinder misfire, but in my mind the last (0304) could be the root problem and it seems the injector is the only item i haven't replaced yet.
#17 of 38 Re: engine misfire [mdenman1]
Feb 19, 2008 (6:05 am)
I believe that you can have the fuel injectors tested and cleaned by some auto service places. My only question would be if you are not familiar with them or don't know their reputation, then you may end up with a new set of injectors based on their evaluation when you may only need one. Regardless, injectors do wear out or are damaged and need replacement, so that is definitely a possiblity. Have you done a fuel pressure test to verify that adequate fuel pressure is available? Assuming there is, then a good shop should be able to fix or recommend replacement of the injector. I know they don't come cheap, but you seem to have eliminated most of the common causes. HTH Good luck.
#18 of 38 Re: engine misfire [atfdmike]
Mar 15, 2008 (10:07 pm)
if you like offroad asmuch as i do check for bent/dented fuel lines.... i get that alot