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Isuzu Trooper Check Engine Light

59 messages,  Last post on Jan 31, 2011 at 11:34 AM

You are in the Isuzu Trooper Forum.

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

Messages Page 2 of 7

#4 of 59 Re Intermittent Check Engine Light. by lesliecooper

May 01, 2007 (4:34 am)

Same subject but different ingredients! (In the UK)I have a 2001 Isuzu Trooper 3.0L diesel automatic which overheated on me whilst towing my caravan in hilly country. I noticed it before any damage was done but not before the Check Engine light came on. Thereafter the light came on and off in a completely random fashion without any apparent effect on the engine, all the functions of which seemed normal. However during a visit to the main Isuzu dealer nearby I asked them to plug in their electronic analyser thing, and they told me the throttle body needed replacing (at a great cost). I have obtained a replacement throttle body (not new but said to be in good working order) and having fitted it I find that the light comes on when the engine is not under load, but instantly goes out when an accelerator load is placed on the engine. This suggests to me that one or other of the sensors on the throttle body is minutely out of adjustment - I noticed that both the sensors have slotted mounting holes - but I am not able to find anywhere where the functions of the two sensors are described nor the manner in which they should be adjusted. Even the people I spoke to at the main dealers did not seem to know!! Can anyone please help.

#5 of 59 Re: Re Intermittent Check Engine Light. [lesliecooper] by atfdmike

May 01, 2007 (6:58 am)

Replying to: lesliecooper (May 01, 2007 4:34 am)
Unfortunately, the diesel has not been available in the US, so little practical experience with it here. On the gas engines though, the TPS (throttle position sensor)and other sensors for air flow and idle are also there and some are adjustable and I would imagine the same is true for yours. I assume you have already checked the fuel (and water?) filters as equipped?
The procedure usually includes the use of a digital voltmeter and is not technically challenging, but hopefully someone who has done it or has a diesel manual will see your post and respond. One guys opinion.

#6 of 59 EGR Flow insufficient by mbp1

May 12, 2007 (6:55 am)

In my 1998 Trooper S, I've been getting check engine light due to insufficient EGR flow every year since the past four years. I was told by a dealer that this could be because of my shorter and slower commute (15 miles at 35 mph the most). The dealer advised me to occasionally use higher octane fuel. I've been doing that but no relief. I cleaned the valve and the inlet pipe from the exhaust just recently and reset the codes. But the problem resurfaced in a month.
Any suggestions on resolving this issue?
Any suggestions on cleaning the outlet pipe that goes into air intake? I could not clean this pipe properly. Is there any way to clean without opening the air intake?
 
Thanks very much in advance.

#8 of 59 Check Engine light by twlsnbys

Jun 14, 2007 (8:52 pm)

I have a 2000 Isuzu Trooper
 and the check engine light
 stays on, i had it check out
 and it was the EGR valve.
 How do you remove the old
EGR valve and replace it
with a new one? Please advise.

#9 of 59 Re: Check Engine light [twlsnbys] by atfdmike

Jun 15, 2007 (4:32 am)

Replying to: twlsnbys (Jun 14, 2007 8:52 pm)
Located on RH side of engine near rear. It has a wiring connector and two bolts that hold it in place. The only way to verify it is working is to use a Tech 2 and monitor it while running.
There is a gasket between it and the manifold that you may need to replace if in removing the valve it is damaged. Your discretion.
Original Isuzu part no is 8170961783
Hope this helps

#10 of 59 Re: Check Engine light [atfdmike] by wlbrown9

Jun 15, 2007 (7:54 am)

Replying to: atfdmike (Jun 15, 2007 4:32 am)
Here is a link to the FAQs. Look at the section on EGR cleaning. Might help...you might be able to remove and clean it, if not you can just replace it.
 
http://www.isuzufaq.com/

#11 of 59 99 trooper erg valve issues by mcharger

Feb 20, 2008 (5:41 pm)

get po401 error replaced erg valve light went off took to get IM inspection came back on failed with same error drove it for about 50 miles light went off again stayed off for 2 days now back on same error took to mechanic has no clue hard to find Isuzu dealers in UT any ideas what else problem could be---mechanic says could be wiring from valve or the whole computer. Random on and off of the check engine light with always same p0401 code. Really fustrated

#12 of 59 Re: 99 trooper erg valve issues [mcharger] by atfdmike

Feb 21, 2008 (6:38 am)

Replying to: mcharger (Feb 20, 2008 5:41 pm)
Hi, welcome to the forum. I am not sure which engine you have, as I have the older 3.2, but I did a quick search for you and found the following. It is a pretty common problem, and if you can figure out the location on your engine and clean it (try carb cleaner first, I think) by flushing it and soaking it to loosen deposits, you could resolve the problem. HTH
 
" The car will not idle correctly, is difficult to start and runs rough much of the time. My truck did not do any of that. I was also told that in many cases, the insufficient flow may be from carbon in the passageways to and from the EGR valve. After some closer looking with a flashlight in hand, I found a plug that has access to the line between the ERG and the cylinder intake. The plug is located below the EGR unit on the left hand side. You will need a set of hex keys to remove this plug. Once I had the plug removed, I had clear access to the horizontal passageway to the engine intake. I quick inspection did show quite a bit of carbon build up within. To clean the passageway, I broke out my gun cleaning kits and used the barrel brushes attached to a 12 inch section of rod. I believe that it was the .40 caliber brush that was the closest in size. I also used the generic carb cleaner in the process as well. This scrubbing did remove much more buildup than I imagined. I installed the plug back in it’s place and have not had a 401 so far. So I believe that possibly could have been the problem. "

#13 of 59 98 Trooper Check Engine Light by mckellar

Feb 21, 2008 (10:00 am)

My check engine light came on Code P0171 system too lean. How can I correct this?

Messages Page 2 of 7

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