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 Re: Check engine light flashing
[Re: prospector]
#947200
06/12/09 12:46 AM
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Joined: May 2009
Posts: 306
Mudrunner
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The DRB-3 is the factory tool. the last time I priced a new one it was over $2000! I think the Snap-On scan tool may read it, I'm not sure, it it is very expensive, too. Probably easier to try cleaning the terminals then see if it helps. The cluster comes out fairly easily.
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Re: Check engine light flashing
[Re: MartySoCal]
#947201
06/13/09 03:44 PM
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Joined: May 2009
Posts: 17
OP
Need a Spot
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I took the gauge assembly out cleaned contacts,I also took the clear plastic cover and cleaned the dust and dead mosquito thats been bouncing back and forth for the last 2 years.anyway the plug was very tight and had no indication of black marks or corrosion ,put it back and took it for a drive, it was fine until a down hill stretch and on it came but only flashed for 5 seconds then went off ,the weird thing is that It comes on after 3 miles of down hill every time.I can set the trip meter at the top of the down hill stretch and it always comes on around 2.8 to 3.1 miles every time...........too crazy <img src="/forums/images/graemlins/confused.gif" alt="" />
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Re: Check engine light flashing
[Re: prospector]
#947202
06/14/09 03:55 PM
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Joined: May 2009
Posts: 306
Mudrunner
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For '97 and '98 TJ's, there was a TSB for a similar MIL problem while decelerating, TSB# 18-08-00. It would set a code P0107, MAP volts too low, caused by long decel at closed throttle, over 1500 rpm. It would store a code if this occured. The TSB repair involves reprogramming the PCM. This TSB does not apply to the 2000 model TJ. I see no reflashes for it, either looking at Alldata.
Another issue might be that under a long closed throttle decel conditions, right after starting a cold engine, the engine might not get hot enough, and would set a "Engine too cold" fault. The PCM will shut off injector pulse (No fuel) at high vacuum, closed throttle conditions, over a certain vehicle speed. The PCM needs to see a rise to at least 140* in the first three minutes. If the engine gets no fuel, it will not build heat. This code usually will not set a light for this code, but a code would be stored in any event.
Can you run the Jeep in the same way that sets the light flashing while a buddy holds a scan tool watching for any code/s while the light comes on?
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Re: Check engine light flashing
[Re: MartySoCal]
#947203
06/14/09 04:42 PM
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Joined: Oct 2003
Posts: 7,768
Web Wheeler
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I vote MArty for president! For '97 and '98 TJ's, there was a TSB for a similar MIL problem while decelerating, TSB# 18-08-00. It would set a code P0107, MAP volts too low, caused by long decel at closed throttle, over 1500 rpm. It would store a code if this occured. The TSB repair involves reprogramming the PCM. This TSB does not apply to the 2000 model TJ. I see no reflashes for it, either looking at Alldata.
Another issue might be that under a long closed throttle decel conditions, right after starting a cold engine, the engine might not get hot enough, and would set a "Engine too cold" fault. The PCM will shut off injector pulse (No fuel) at high vacuum, closed throttle conditions, over a certain vehicle speed. The PCM needs to see a rise to at least 140* in the first three minutes. If the engine gets no fuel, it will not build heat. This code usually will not set a light for this code, but a code would be stored in any event.
Can you run the Jeep in the same way that sets the light flashing while a buddy holds a scan tool watching for any code/s while the light comes on? There ya go! Straight from the horses mouth... WOW Marty! Good to have ya aboard. I am wondering if the thermostat could contribute to such a situation.. AND I'm wondering what the temperature outside is on that 3 mile downhill.. Big JIm <img src="/forums/images/graemlins/pfft.gif" alt="" />
professional bovine relocation specialist
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Re: Check engine light flashing
[Re: BigJim]
#947204
06/14/09 11:34 PM
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Joined: May 2009
Posts: 17
OP
Need a Spot
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Good point,the t-stat was a jet 190 high flow,coolant temp never ran over 195, after reading other forums I decided to put a factory spec 195 in it today and went for a ride ,down hill the temp ran at 203 , with no flashing light,uphill it ran at 206 my scan tool was plugged in the entire time with no codes,maybe this was the issue,what do you think Marty? Also on the computer you can see where the dealership has done something with the computer because there is a new sticker pasted over the original,looks like a update or something . I will let you know if this was the problem,need to put some drive time on it because I had to clear a code that was set when I forgot to plug the coolant sensor back in after I switched out the t-stat,one last thing does anyone know how to speed up the drive cycles that are required to finish the system checks (M I L ) I think it says on the scan tool ,the cat one flashes forever. THANKS FOR THE HELP.. <img src="/forums/images/graemlins/patriot.gif" alt="" />
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Re: Check engine light flashing
[Re: prospector]
#947205
07/10/09 03:09 PM
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Joined: May 2009
Posts: 17
OP
Need a Spot
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The camshaft position sensor synchronizer ,or oil pump drive that synchronizes fuel pulse and coil firing had moved,or changed after time , had it synchronized with a dbr tool at local shop,this is why a random misfire code would come on during a no load situation at or above 2000 rpm,this synchronizer if its off will cause all sorts of problems I am told,like p0300 p0301 etc. I wonder if many people that have a random misfire code that cant be explained have this synchronizer problem.Marty is this something you have seen before?
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Re: Check engine light flashing
[Re: prospector]
#947206
07/10/09 04:06 PM
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Joined: Oct 2003
Posts: 7,768
Web Wheeler
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The camshaft position sensor synchronizer ,or oil pump drive that synchronizes fuel pulse and coil firing had moved,or changed after time , had it synchronized with a dbr tool at local shop,this is why a random misfire code would come on during a no load situation at or above 2000 rpm,this synchronizer if its off will cause all sorts of problems I am told,like p0300 p0301 etc. I wonder if many people that have a random misfire code that cant be explained have this synchronizer problem.Marty is this something you have seen before? Somebody here must help me on this. Where did they hide that little devil? I think he is saying the timing was adjusted...but I'm not too sure of even that. Big Jim <img src="/forums/images/graemlins/pfft.gif" alt="" />
professional bovine relocation specialist
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Re: Check engine light flashing
[Re: BigJim]
#947207
07/13/09 12:34 AM
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Joined: May 2009
Posts: 17
OP
Need a Spot
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Bigjim lay off the booze ,or could it be all that raw meat in your gut ,anyway its obvious you have not worked on one of these jeeps so stop with the smart mouth bull........
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Re: Check engine light flashing
[Re: prospector]
#947208
07/14/09 01:47 AM
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Joined: Oct 2003
Posts: 7,768
Web Wheeler
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Bigjim lay off the booze ,or could it be all that raw meat in your gut ,anyway its obvious you have not worked on one of these jeeps so stop with the smart mouth bull........ Dude you don't want to get in an aze munching contest with me! You are waaay out of your league.. Big JIm <img src="/forums/images/graemlins/pfft.gif" alt="" />
professional bovine relocation specialist
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Re: Check engine light flashing
[Re: BigJim]
#947209
07/15/09 12:02 AM
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Joined: Nov 2007
Posts: 633
Rock Warrior
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Not marking out but I would not lash out against BJ. He has a good sense about Jeeps. Calm down, man.
Thanx for the advice on the TPS Jim and Marty, cleaned it up and now the Laredo idles great. I don't think I spoke about it but the last thread on it helped me out. Seems like when I read things on here things happen to me.
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