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
#31 of 38 Re: 95 Trooper 3.2 SOHC Misfire and black smoke [marknroll]
May 28, 2009 (9:08 am)
I hate to dredge up an old thread but came across your experience while researching about a similar experience I'm having with my 2000 Trooper. The engine bogs at 40-45 mph and won't maintain speed (65-75 mph) in top gear on the highway. An abrupt downshift brings back the power and speed but after the resulting upshift back to fourth gear, no amount of throttle will maintain speed. After about two cycles of this shifting and bogging/lugging, the CEL will flash but doesn't leave a code. Upon slowing down, the CEL goes off and the engine stalls when I come to a stop. A compression test shows 150-155 psig on five cylinders and about 135 on the passenger side front cylinder. All plugs look fine (dry with a little black on the end) and the plug wires/coils also appear to be in decent shape. I will clean the EGR and PCV tonight. The trooper has about 55k miles (unless a previous owner has messed with the odo) so I'm a bit baffled by this lack of performance. Lastly, the fuel mileage has dropped from about 14 mpg to less than 12. Any help would be appreciated. Thanks in advance.
#32 of 38 Re: 95 Trooper 3.2 SOHC Misfire and black smoke [diesel3333]
Jun 01, 2009 (9:34 am)
I'm no expert and this is a shot in the dark...but how is you cat converter? It might be possible that it is starting to plug and back pressure could cause the problem with maintaining speed on the hwy. But if you can downshift and get decent performance in 3rd that might make that possibility a no. Good luck on finding a resolution.
#33 of 38 1998 Isuzu trooper 3.5l cylinder 3 misfire
Jun 01, 2010 (11:57 am)
This problem showed up about 8 months ago. since i have replaced all spark plugs with ngk and then again with champions, i replaced fuel injector, coil over plug, muffler, and battery. ive cleaned egr valve and maf, and throttle body. intake gasket is fine had a shop replace the timing belt and checked compression in all cylinders. compression is 170 - 172 in all 6 cylinders. when i change something it runs 2 - 3 weeks then bam code p0303. any ideas would be greatly appreciated.
#34 of 38 PO308-misfire on #3.
Jun 11, 2011 (1:30 pm)
1996 3.2,which cylider is 3 if u are standing in front of car looking at engine?
#35 of 38 Re: PO308-misfire on #3. [9millileter]
Jun 13, 2011 (2:53 am)
#3 is on passenger side (Right), middle cylinder
#36 of 38 left bank head not firing.
Aug 10, 2011 (4:38 pm)
HELP.... I recently change out the motor on my 2000 trooper 3.5L and change the water pump and timing belt and retime. The engine would start but run really rough. I can take out plugs 2,4,6 and the car wouldn't stall or act like its losing power or die out, but if you take out 1,3,5 it die out right away. Is this normal????? Also no power when driving the car. I check for compression and sparks everything there. Really confuse, what could be wrong? Please help....
#37 of 38 Re: left bank head not firing. [lemon19]
Aug 11, 2011 (6:52 pm)
You have timed the engine wrong. If you followed a Haynes or Chilton manual, this is the result. They don't have the correct procedure for these engines. Tear it back down, line up the crank mark with the mark on the oil pump. Now, locate the timing mark on the passenger side head. Turn the cam and it will thunk thunk into certain spots. Keep thunking it around until the mark on the sprocket naturally lines up with the mark on the head. It may take several turns. Then go the drivers side. There are TWO marks on the head for this one. One that is in a similar location to the passenger side and another one about 90 degrees to the LEFT. Thunk, thunk the cam until it naturally lines up with the second mark mentioned. Now, turn the sprocket to the right 90 degrees to line it up with the top mark. It may not want to stay there. Install your belt with the marks on the belt lining up with the timing marks and hold it in place with some clips. reset your tensioner and install. You can install the lower crank pulley temporarily and start the engine to confirm you got it right.
#38 of 38 Re: left bank head not firing. [catfuzz]
Aug 14, 2011 (9:57 am)
Catfuzz your the greatest. You are a pro... Next time they should let you write the book.. Thanks for your help. I did tried it 3 times and it didn't work. My friends thought I was crazy bout only one side of the head working. Again thanks.