- #20 of 31
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flashing check engine light
by rob_w1
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Mar 28, 2009 (10:18 am)
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i have a 2001 trooper, rescently it started to idle rough. I took it to a shop and the codes read basically a tune up and O2 sensor, having 75000 miles i had them do one. the trooper ran better, but still idled rough and the light was flashing at or about 2500 rpm. i took advice from another blog and learned the intake gasket was shot. i changed it and the truck runs alot better, but the light still is on and flashes after 2500 rpm, and reads no codes. Any ideas?
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- #21 of 31
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Re: flashing check engine light [rob_w1]
by brentb1
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Mar 28, 2009 (10:48 am)
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Replying to: rob_w1 (Mar 28, 2009 10:18 am)
yep my guess was the intake gaskets also.not sure why the light would still be on and no codes.disconnect the battery for 15 minutes that should reset it.let me know what happens.should clear all codes.if light comes back on you have to have a code stored...keep me posted.gl.
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- #22 of 31
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Re: flashing check engine light [brentb1]
by rob_w1
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Mar 30, 2009 (5:11 pm)
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Replying to: brentb1 (Mar 28, 2009 10:48 am)
I disconnected the battery and the light went off until i drove. i noticed the light flashes when i accelerate, when i let off the gas, the light stays on. could there be no code since the reader is checking while at idle? Is it possibly a throttle position sensor?
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- #23 of 31
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Re: flashing check engine light [rob_w1]
by atfdmike
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Apr 02, 2009 (8:49 am)
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Replying to: rob_w1 (Mar 30, 2009 5:11 pm)
Why not just get the codes read at an autozone or other for free. Once you know the code, that should help direct your efforts. That said, my guess is that you have an EGR problem, either needs to be cleaned or the valve itself is sticking or solenoid is not working. Odds are it is the EGRpassage in manifold. One guys opinion.
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- #24 of 31
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Re: flashing check engine light [rob_w1]
by grabber7
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Apr 09, 2009 (7:43 am)
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Replying to: rob_w1 (Mar 30, 2009 5:11 pm)
I'm having the same problem except the light goes off when i let off the gas. I have a 2002 LTD 4wd.
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- #25 of 31
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Re: Intermittent Check Engine Light [lukinagin]
by woodpusher
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Apr 18, 2009 (3:12 pm)
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Replying to: lukinagin (Sep 18, 2006 10:26 am)
cleaning the erg valve isnt going to do anything you need to replace it. Here how to check to see if it is working (mechanical valves only) Have the vehical running take your hand under the egr valve and push up on the plunger if the car stumbles your good to go if not new valve or check for kinks in vaccum hose
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- #26 of 31
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Re: flashing check engine light [rob_w1]
by jeepnstein1
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Apr 27, 2009 (6:03 am)
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Replying to: rob_w1 (Mar 30, 2009 5:11 pm)
I'm betting on intake gaskets. It'll just keep getting worse until the thing barely runs. The OEM's are a hard plastic that gets brittle with age. The good news is they are easy to change. Fel-Pro makes one that is softer, with steel inserts to keep it from getting crushed. You should be able to change both sides in less than two hours.
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- #27 of 31
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Re: trooper 98 check engine light [brentb1]
by icarus681
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May 05, 2009 (5:02 pm)
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Replying to: brentb1 (Jan 14, 2009 3:14 pm)
Hi! I, already take out the manifold,and clean it,i also check the computer,clean the egr,change the O2 sensors,injectors were cleaned too,a new gas filter, i cant remember what more and the problem still,thanks for your response.
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- #28 of 31
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Where is the code reader?
by inkaddiction
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Oct 29, 2009 (5:58 pm)
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I am trying to helpl my daughter fix her 94 trooper, v6 dohc 4x4 4 dr......she has all kind of trouble lights on.....so took it to schucks to borrow a code reader, first off, they tell me they dont have an adapter for Isuzu, but that Chevy/GMC should work....ok..........so then the cashier and I go out, pop the hood and spend a good 20 minutes looking stupid....then another good 10 minutes IN the car looking ever dumber..........does any one know where the code read is hiding?
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- #29 of 31
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Re: Where is the code reader? [inkaddiction]
by atfdmike
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Oct 30, 2009 (2:58 am)
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Replying to: inkaddiction (Oct 29, 2009 5:58 pm)
There is a 3 wire pigtail located on the hump on the driver side just where the console meets the carpet and is usually tucked under the carpet. Just follow the carpet end til you meet the console and it should be in there. You jumper the right two wires and turn on the ignition key and the CEL will flash the codes it has stored, one after the other if there are multiple, and repeat a couple more times IIRC.
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