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  #1  
Old December 1st, 2005, 06:18 PM
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Unhappy Idle problem - need advice

When the truck is cold it starts fine and idles and drives normally.

Once the engine warms up after driving around a bit the idle drops and the engine will stall unless I keep the rpm above 1K. If I let it die, then try to start it... it will start up fine, rev to 1K then die. Rinse and repeat until engine cools down.

Not sure if this is coincidence or not, but it started to snow today for the first time this season. Temperatures in the low 30s.

Fuses are fine... Any ideas?

-Dan
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  #2  
Old December 1st, 2005, 06:50 PM
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Hmm, on a 97. Is the ECU throwing any codes? Anyone near by with a code reader?
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  #3  
Old December 1st, 2005, 07:46 PM
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Quote:
Originally Posted by Mike Hippert
Hmm, on a 97. Is the ECU throwing any codes? Anyone near by with a code reader?
THe local shop let me borrow their reader and here is what I got:

P3999 and P0430

From the thread below it appears that these may be bogus.

http://www.defendersource.com/forum/...ighlight=P3999

-Dan
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  #4  
Old December 1st, 2005, 08:29 PM
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Hmm, ok have you tried cleaning the IAC? Sometimes the end gets dirty and needs to be cleaned up to work correctly.
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  #5  
Old December 1st, 2005, 09:05 PM
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Sounds like an issue when it goes into closed-loop, and starts accepting input from other sensors. I'd start throwing an ohm meter onto things like the MAF sensor and TPS sensor. Those would be the culprits I would suggest first. Maybe also check the crank sensor too.

-Hans
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  #6  
Old December 1st, 2005, 09:14 PM
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Quote:
Originally Posted by Mike Hippert
Hmm, ok have you tried cleaning the IAC? Sometimes the end gets dirty and needs to be cleaned up to work correctly.
Where is the IAC on the 4.0? It is not where I expected it to be...

http://www.defendersource.com/forum/...achmentid=4038
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  #7  
Old December 1st, 2005, 09:52 PM
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Never worked on a 4.0, but from the limited info I could find real quick on the net, also check the side of the throttle body. Either way, it has to be somewhere on that upper manifold area.

-Hans
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  #8  
Old December 1st, 2005, 10:18 PM
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Dan, i'm in the Redmond area. 97 D90 also. If you can get over here I'd be happy to offer a second opinion or help. How many miles on the rig?? Send me a pm if you want
jeff
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  #9  
Old December 2nd, 2005, 01:29 PM
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Ok, so I found the IAC and cleaned the bugger.... now the idle is way too high

Maybe time for a new stepper motor?

-Dan
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  #10  
Old December 2nd, 2005, 01:46 PM
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Try reseting the ECU, it may need to relearn the stepper now that it is clean.
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  #11  
Old December 2nd, 2005, 02:00 PM
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Quote:
Originally Posted by Mike Hippert
Try reseting the ECU, it may need to relearn the stepper now that it is clean.
To reset, simply disconnect battery?

-Dan
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  #12  
Old December 2nd, 2005, 02:21 PM
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I am not 100% sure on a 97? I think if you disconnect the ECU for 5 minutes or so that should do the trick.
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  #13  
Old December 2nd, 2005, 02:33 PM
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Ok... ECU reset and idle is back in normal range, but the problem persists


-Dan
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  #14  
Old December 2nd, 2005, 03:02 PM
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Check for any vacuum leaks, they don't have to be big to screw things up.
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  #15  
Old December 2nd, 2005, 03:02 PM
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Does anyone know if NAPA part # 2-1738 (stepper motor) is only for pre-97 models?

-Dan
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  #16  
Old December 2nd, 2005, 09:57 PM
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Dan, that number(2-1738) is for the 94-95 3.9L engine. The one for the '97 from Napa is CRB21856 $43.49. The brand is Echlin...
Here's the link:
http://napaonline.com/masterpages/NO...+Control+Valve


jeff
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  #17  
Old December 2nd, 2005, 11:27 PM
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Wow, looks almost exactly like the one on my Jeep too!

-Hans
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My oil line fix

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  #18  
Old December 3rd, 2005, 01:54 AM
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Quote:
Originally Posted by 48vphantom
Dan, that number(2-1738) is for the 94-95 3.9L engine. The one for the '97 from Napa is CRB21856 $43.49. The brand is Echlin...
Here's the link:
http://napaonline.com/masterpages/NO...+Control+Valve


jeff
Thanks Jeff!
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  #19  
Old December 3rd, 2005, 09:31 AM
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Check the fuel pressure regulator. I had a problem with idle that lead to the engine dieing then it wouldn't start. Cleaned the fuel pressure reg. with WD40 it's been fine since.
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  #20  
Old December 6th, 2005, 01:17 PM
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FOLLOW UP: The problem turned out to be a bad throttle position sensor.

All better now

-Dan
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