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SUVs Isuzu Trooper Isuzu Trooper Engine Misfire
32 messages, Last post on Jun 01, 2009 at 8:34 AM
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I am trying to fix a problem with a '01 Trooper Limited 4WD. The vehicle has 75,000 miles and started to sound rather rough. My wife had the vehicle checked at a shop and was told the EGR valve was bad. I replaced the part as well as a new set of plugs, reset the OBD codes and the car runs a lot better. I am still getting a P0300 code (multilple engine misfire) and the check engine light blinks only when the car is moving. It does not blink when the car is not moving even if the same RPM level is reached. What is causing this misfire?
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Replying to: krowe (Feb 26, 2007 8:28 am) .. The other known occasionally >60K miles failing part on the 01 Trooper 3.5L engine is the intake manifold gaskets. These are thick composite insulating gaskets, and they can sometimes crack allowing air into the engine. Air input into the engine at a gasket leak bypasses the air filter and engine computer monitoring. This can cause damage from dirt sucked in and poor engine performance because the computer cannot adjust the fuel mix properly to account for the extra air. The replacement gaskets are supposed to also be better than original so the problem will not happen again.
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Replying to: boxtrooper (Feb 26, 2007 7:11 pm)
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Replying to: laparka55 (Mar 10, 2007 5:01 pm) |
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Alright I've searched the history and dug as far back as I can to find an answer with no luck! My Trooper has 173K on it, timing belt done at 120K and regular service done always. I was driving for a while, maybe 2 months, with an intermittent check engine light. It would only come on while driving around 50-60 mph then when it would come down to idle speed it would go off. Then one day it started misfiring and bellowing black smoke!!! I had an oil change , fuel and air filter done and she ran fine, FOR A WHILE!!!  Then all the sudden it's back the bogging, the smoke. I've replaced plug wires, new Bosch platinum plus 2 spark plugs and new O2 sensor(it was black as were the plugs) and it still is missing??? Any ideas what to check next? 
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Replying to: marknroll (Mar 17, 2007 6:25 pm) .. Is the loss of power extreme when it smokes? That might favor the not firing scenario. .. Paison I think, had a failed catalytic converter slowing down the air flow and that caused power problems. |
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Replying to: marknroll (Mar 17, 2007 6:25 pm) |
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Replying to: marknroll (Mar 17, 2007 6:25 pm) |
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| 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 | |
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Replying to: mdenman1 (Feb 16, 2008 2:44 pm) HTH One guys opinion. |
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