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 Re: Check Engine Light goes On-OFF-ON-OFF-ON-OFF-ON-Off-On...
#529475
11/23/04 02:47 PM
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Joined: Feb 2002
Posts: 163
OP
Wheeler
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Checking the codes for the "check engine" light is a wise idea. With the introduction of OBDll in 1996, it should be fairly easy to retrieve the codes and find the problem. As far as I know a light that comes on and goes off will store a code...but pplotz is right...blinking on/off is an indication that the truck is definitely not happy about you continuing to run her without fixing the problem. You're lucky you have a 2000 and can use OBDll scanning to diagnose. Us first genners have to rely on other less reliable means of diagnosing and sometimes it can nickle & dime us to an empty pocket and a whole lot of frustration.
Good luck...
dawn... I hear you on the first gens- see my sig... <img src="/forums/images/graemlins/kewl.gif" alt="" /> ...I'm off to get...diagnosed. <img src="/forums/images/graemlins/shocked.gif" alt="" />
2012 Jeep Liberty 2000 Trooper 3.5, LS/Burgandy & Grey(O.B.T.2)...<img src="/forums/images/graemlins/cheers.gif" alt="" /> I WAS down with O.B.T. '88 Trooper II ("Old Blue Trooper!" said my kids!...)
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Re: Check Engine Light goes On-OFF-ON-OFF-ON-OFF-ON-Off-On...
[Re: glock]
#529476
11/23/04 06:41 PM
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Joined: Feb 2002
Posts: 163
OP
Wheeler
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OK. Hit the local service station (closer then AutoZone) and, while they were busy, they managed to to the diagnostic. She "blew" a Random Misfire" code and 3 Unknown codes. <img src="/forums/images/graemlins/shocked.gif" alt="" /> ...Dropping her off in A.M. for inspection AND now this B.S. Stay tuned...
2012 Jeep Liberty 2000 Trooper 3.5, LS/Burgandy & Grey(O.B.T.2)...<img src="/forums/images/graemlins/cheers.gif" alt="" /> I WAS down with O.B.T. '88 Trooper II ("Old Blue Trooper!" said my kids!...)
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Re: Check Engine Light goes On-OFF-ON-OFF-ON-OFF-ON-Off-On...
[Re: glock]
#529477
11/23/04 06:48 PM
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Joined: Sep 2003
Posts: 826
Rock Warrior
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Bosch plugs have been known to cause misfires in these motors. Get a new set of plugs and you may be surprised. Do a search on here about spark plugs.
Dan
92 Rodeo, 3.1 TB crank, custom bumpstop spacers, DOR shackles, Flipped ball joints, D44 Rear, 4.56s and new magnaflow cat and dynomax ultraflow muffler Since been replaced by a 2 door Explorer on 31's shackles, cranked torsion bars and full exhaust
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Re: Check Engine Light goes On-OFF-ON-OFF-ON-OFF-ON-Off-On...
[Re: hunterdan]
#529478
11/24/04 02:06 PM
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Joined: Feb 2002
Posts: 163
OP
Wheeler
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Bosch plugs have been known to cause misfires in these motors. Get a new set of plugs and you may be surprised. Do a search on here about spark plugs.
Dan Why would Bosch give my Troop...indigestion? <img src="/forums/images/graemlins/barf.gif" alt="" /> I thought I was doing a good thing... <img src="/forums/images/graemlins/baby.gif" alt="" />
2012 Jeep Liberty 2000 Trooper 3.5, LS/Burgandy & Grey(O.B.T.2)...<img src="/forums/images/graemlins/cheers.gif" alt="" /> I WAS down with O.B.T. '88 Trooper II ("Old Blue Trooper!" said my kids!...)
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Re: Check Engine Light goes On-OFF-ON-OFF-ON-OFF-ON-Off-On...
[Re: glock]
#529479
11/24/04 09:13 PM
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Joined: Sep 2003
Posts: 826
Rock Warrior
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It has something to do with the internal resistance of the plugs. I think they act as some kind of sensor when the plug isnt firing.
Dan
92 Rodeo, 3.1 TB crank, custom bumpstop spacers, DOR shackles, Flipped ball joints, D44 Rear, 4.56s and new magnaflow cat and dynomax ultraflow muffler Since been replaced by a 2 door Explorer on 31's shackles, cranked torsion bars and full exhaust
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 Re: Check Engine Light goes On-OFF-ON-OFF-ON-OFF-ON-Off-On...
[Re: hunterdan]
#529480
11/25/04 12:16 AM
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Anonymous
Unregistered
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I agree Dan. Bosch is such a popular brand that you would think you are doing a good thing. Though I don't understand why, I've always had the best luck with NGK's, or Champion though. Go figure...
Happy Turkey Day Everyone...
dawn...
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Re: Check Engine Light goes On-OFF-ON-OFF-ON-OFF-ON-Off-On...
#529481
11/25/04 02:56 PM
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Joined: Sep 2003
Posts: 826
Rock Warrior
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I did a quick search with +3.2 +sparkplugs and came acros this thread . I hope it works, its not very long, but describes the same issues you are having. But it also tells you which plugs to find. Dan
92 Rodeo, 3.1 TB crank, custom bumpstop spacers, DOR shackles, Flipped ball joints, D44 Rear, 4.56s and new magnaflow cat and dynomax ultraflow muffler Since been replaced by a 2 door Explorer on 31's shackles, cranked torsion bars and full exhaust
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Re: Check Engine Light goes On-OFF-ON-OFF-ON-OFF-ON-Off-On...
[Re: glock]
#529482
12/02/04 01:00 AM
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Joined: Feb 2002
Posts: 163
OP
Wheeler
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OK...was out of town for a few days... The mechanic was able to get rid of the 3 "unknown" codes, but couldn't shake the "random misfire" code. The light kept flashing but he told me to head off on my trip and that maybe we would swap out the plugs like you guys have recommended. He had checked each plug and all seem fine. Truck drove just fine as well on 600+ mile trip... <img src="/forums/images/graemlins/kewl.gif" alt="" /> <img src="/forums/images/graemlins/confused.gif" alt="" />
2012 Jeep Liberty 2000 Trooper 3.5, LS/Burgandy & Grey(O.B.T.2)...<img src="/forums/images/graemlins/cheers.gif" alt="" /> I WAS down with O.B.T. '88 Trooper II ("Old Blue Trooper!" said my kids!...)
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Re: Check Engine Light goes On-OFF-ON-OFF-ON-OFF-ON-Off-On...
[Re: glock]
#529483
12/02/04 02:03 AM
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Joined: Oct 2002
Posts: 2,285
Body Damage is Cool
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You're not going to "shake" any codes here. 3 people already told you those plugs don't work on that engine and you are still confused. This engine uses "Ion-sensing" technology, which like dan said uses the plug as a sensor during the exhaust stroke. Using other plugs may be confusing the computer, since different plugs have different construction/internal resistance/materials etc. Isuzu, Delphi to use ion-sense ignition
Isuzu Motors Ltd. and Delphi Automotive Systems Corp. say their ôion senseö ignition subsystems ù in use for the past year on Isuzu Troopers and Rodeos ù have enabled cuts in emissions and fuel usage while adding value by integrating functions.
The ion-sense system consists of an individual ignition coil for each cylinder and a central control module, none of which have any moving parts. After the spark fires the cylinder's air/fuel mixture, the system applies a DC current to the sparkplug gap, turning the spark plug into a sensor. When there are ions present in the gap, there are changes in the DC current that can be translated into useful information about the effectiveness of the combustion process.
Delphi says the ion sense system eliminates the need for the individual crankshaft, camshaft and rough-road sensors typically used for engine-management information. Also, the in-cylinder sensing of misfire and knock is an improvement of most current methods.
2eyefishclaw []
AF Enthusiast
Joined: Oct 2003
Status: online
Posts: 429
04-04-2004, 09:53 PM Re: Would like to put in 87 octane, but car seems to ping. Any suggestions? (Post #8)
if its 2000 or newer it may have champion plugs if so remove them and use only nippendenso its what works best with the Ion sense module
Report Post | IP: Logged So if Isuzu goofed up by putting Champion spark plugs that wouldn't even work correctly when the truck rolled off the assembly line, I suppose I can't bust your balls about not listening to what people have suggested. <img src="/forums/images/graemlins/pfft.gif" alt="" /> The whole system seems mysterious to me and very complicated. I can see how it could measure a/f ratio of exhaust gas, but how can it determine pinging? It must measure wether fuel is present and when it turns to exhaust gas, maybe if it ignites too early compared to crank position, the ecm determines the engine is pinging. Good stuff though either way.
CHRIS
98 Amigo, 92 Pup
need a pickup 1st gen fuel level sender
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Re: Check Engine Light goes On-OFF-ON-OFF-ON-OFF-ON-Off-On...
[Re: CPOM]
#529484
12/02/04 06:42 PM
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Joined: Feb 2002
Posts: 163
OP
Wheeler
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You're not going to "shake" any codes here. 3 people already told you those plugs don't work on that engine [color:"red"]AND YOU ARE STILL CONFUSED? [/color] This engine uses "Ion-sensing" technology, which like dan said uses the plug as a sensor during the exhaust stroke. Using other plugs may be confusing the computer, since different plugs have different construction/internal resistance/materials etc. Isuzu, Delphi to use ion-sense ignition
Isuzu Motors Ltd. and Delphi Automotive Systems Corp. say their ôion senseö ignition subsystems ù in use for the past year on Isuzu Troopers and Rodeos ù have enabled cuts in emissions and fuel usage while adding value by integrating functions.
The ion-sense system consists of an individual ignition coil for each cylinder and a central control module, none of which have any moving parts. After the spark fires the cylinder's air/fuel mixture, the system applies a DC current to the sparkplug gap, turning the spark plug into a sensor. When there are ions present in the gap, there are changes in the DC current that can be translated into useful information about the effectiveness of the combustion process.
Delphi says the ion sense system eliminates the need for the individual crankshaft, camshaft and rough-road sensors typically used for engine-management information. Also, the in-cylinder sensing of misfire and knock is an improvement of most current methods.
2eyefishclaw []
AF Enthusiast
Joined: Oct 2003
Status: online
Posts: 429
04-04-2004, 09:53 PM Re: Would like to put in 87 octane, but car seems to ping. Any suggestions? (Post #8)
if its 2000 or newer it may have champion plugs if so remove them and use only nippendenso its what works best with the Ion sense module
Report Post | IP: Logged So if Isuzu goofed up by putting Champion spark plugs that wouldn't even work correctly when the truck rolled off the assembly line, I suppose I can't bust your balls about not listening to what people have suggested. <img src="/forums/images/graemlins/pfft.gif" alt="" /> The whole system seems mysterious to me and very complicated. I can see how it could measure a/f ratio of exhaust gas, but how can it determine pinging? It must measure wether fuel is present and when it turns to exhaust gas, maybe if it ignites too early compared to crank position, the ecm determines the engine is pinging. Good stuff though either way. I admit I'm confused by the trucks good performance on a 600 mile trip...WITH the check engine light flashing away. <img src="/forums/images/graemlins/butwiggle.gif" alt="" /> I also upgraded the gas I use from regular to plus...The minor pinging I had heard before changing the plugs has disappeared... <img src="/forums/images/graemlins/cheers.gif" alt="" />
2012 Jeep Liberty 2000 Trooper 3.5, LS/Burgandy & Grey(O.B.T.2)...<img src="/forums/images/graemlins/cheers.gif" alt="" /> I WAS down with O.B.T. '88 Trooper II ("Old Blue Trooper!" said my kids!...)
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