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Isuzu Trooper Engine Misfire

32 messages,  Last post on Jun 01, 2009 at 8:34 AM

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What is this discussion about? Isuzu Trooper, Isuzu Trooper II, Electrical, Engine, Exhaust, SUV

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#23 of 32 Re: 1998 Trooper Misfire [landfill] by paisan Aug 19, 2008 (4:21 pm)
Replying to: landfill (Aug 16, 2008 11:45 am) When did you change your plugs last? Could need new plugs and/or wires?   -mike
#24 of 32 Re: 1998 Trooper Misfire [landfill] by steven56 Aug 29, 2008 (2:53 pm)
Replying to: landfill (Aug 16, 2008 11:45 am) Just had the plugs replaced. Still doing it. Checking next week on the O2 sensors and the coil packs. Check engine light came back on less than 5 minutes after being reset at shop. Any other ideas? I'll let y'all know. Thanks! Replies to this message: wlbrown9 (Sep 05, 2008 4:38 pm)
#25 of 32 Re: 1998 Trooper Misfire [steven56] by wlbrown9 Sep 05, 2008 (4:38 pm)
Replying to: steven56 (Aug 29, 2008 2:53 pm) Not sure about the '98 but 2000 Trooper will only like the 3 specific plugs listed in the manual. Using any other plug will probably trigger the CEL pronto. I have these listed in my notes as being recommended in the manual. My '00 had the 3rd one listed, Champion. That is what I used for replacement   K16PR-P11 PK16PR11 RC10PYP4
#26 of 32 Fix for blowing smoke & loss of power by metroawd Oct 01, 2008 (9:29 am)
Change the timing belt & timing belt tensioner. I'd also change the water pump while I was in there. Problem solved. (Been there, done that).
#27 of 32 not firing on one cyl by tropper5 Oct 05, 2008 (7:24 pm)
my bother is have a problem with his trooper his number five cyl does not have any spark all the rest seem ok he took the plugs out in check them they all look good but number five plug.He move the coil pack from a good cyl to number five still no spark change plugs.Number five plug is wet with gas when he take it out. it a 95 anybody have these kind of problems.
#28 of 32 error code p1340 ignightion controle misfire 2001 trooper by successisforme Oct 21, 2008 (4:48 pm)
I have a 2001 trooper . i am getting the p300 EGR and p1340 ignition controle misfire......now...i have read the topics of the egr and i took the egr off and cleaned it well.....cleaned the tube perfectly.....im thinking im gonna have to buy a egr.....but what is the p1340 the engine seems to run great....i went by auto zone and had them reset the codes and the engine light came on right after leaving the parking lot.....im gonna go back and get them to do it again......but what is the misfire code telling me other than just misfire......is there anyone out there with details of their issues.....thanks.... Replies to this message: atfdmike (Oct 22, 2008 3:59 am) wlbrown9 (Oct 22, 2008 6:16 am)
#29 of 32 Re: error code p1340 ignightion controle misfire 2001 trooper [successisforme] by atfdmike Oct 22, 2008 (3:59 am)
Replying to: successisforme (Oct 21, 2008 4:48 pm) I could not find specific code but it is a misfire. Your trooper may have that fancy ion sensing system for ignition....fussy about misfires and plugs. found this on another site: "If you have a 2000-2004 Isuzu, make sure you only use Denso K16PR-P11 spark plugs. The 2000-2004 engines have the GM/delphi "ion sensing" ignition system where the spark plugs are used as a sensor (when they are not firing) to measure the electrical resistance of the gasses in the combustion chamber. Other plugs may cause the ECU to register a code (misfire code: P1340). Also, it has been noted that some 00 trucks came with champion plugs from the factory, which cause knocking, due to to ion sense coils.   If you have 1998-1999, the suggested plugs are NGK or Denso or Champion double platinum plugs"   HTH Replies to this message: wlbrown9 (Oct 22, 2008 6:16 am)
#30 of 32 Re: error code p1340 ignightion controle misfire 2001 trooper [atfdmike] by wlbrown9 Oct 22, 2008 (6:16 am)
Replying to: atfdmike (Oct 22, 2008 3:59 am) I have a '00 Trooper with the Champion plugs from the factory. Replaced them with the exact same and have never had an issue with knocking. The following are what the manual shows for '00:   Manual: K16PR-P11 PK16PR11 RC10PYP4 (Champion I believe)   Bill
#31 of 32 Re: 95 Trooper 3.2 SOHC Misfire and black smoke [marknroll] by diesel3333 May 28, 2009 (8:08 am)
Replying to: marknroll (Mar 17, 2007 6:25 pm) 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. Replies to this message: wlbrown9 (Jun 01, 2009 8:34 am)
#32 of 32 Re: 95 Trooper 3.2 SOHC Misfire and black smoke [diesel3333] by wlbrown9 Jun 01, 2009 (8:34 am)
Replying to: diesel3333 (May 28, 2009 8:08 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.

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