Last post on Jan 31, 2011 at 10:34 AM
You are in the Isuzu Trooper
What is this discussion about?
Isuzu Trooper II, Engine, SUV
#1 of 59 Intermittent Check Engine Light
Sep 18, 2006 (10:26 am)
I've got a 93 Isuzu Trooper that is giving me a check engine light intermittently in the morning. Again, this only happens in the morning and is intermittent. When the car idles, I get no check enging light. When I accelerate, the check engine light comes on. In the afternoon, when the day is warmer, the check engine light stays off. I took the car into the dealer and was told this was the EGR valve so I have removed and cleaned the valve but am still getting the same check engine indicator. I am going to try and replace the EGR valve but was wondering if anyone has seen this before and could offer some advice before I go through the trouble and expense.
#2 of 59 Re: Intermittent Check Engine Light [lukinagin]
Sep 19, 2006 (8:08 am)
Hi, here is what the manual says about the EGR, should be about same for either v6 engine. If you would like the chart, here is a link:
Hope this helps.
1993 Isuzu Truck Trooper (4 Door) V6-3165cc 3.2L DOHC (6VD1)
Vehicle Level Powertrain Management Emission Control Systems EGR Valve Testing and Inspection
Testing and Inspection
Warm engine to operating termperature (120°F / 60°C).
Place finger on on EGR valve diaphragm and accelerate engine, diaphragm should move.
Disconnect vacuum hose from EGR valve.
Using a vacuum pump, apply 10" of vacuum to the valve. It should move and engine should run poorly or stall.
If valve passes above test use CHART C-7A. If valve fails, replace valve.
#3 of 59 Re: Intermittent Check Engine Light [atfdmike]
Sep 19, 2006 (9:38 am)
Thank you atfdmike, I'll test the EGR valve using these steps and see what happens.
#4 of 59 Re Intermittent Check Engine Light.
May 01, 2007 (3:34 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]
May 01, 2007 (5:58 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
May 12, 2007 (5:55 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
Jun 14, 2007 (7:52 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]
Jun 15, 2007 (3:32 am)
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]
Jun 15, 2007 (6:54 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.