1997 Plymouth Voyager Van Stalls when coming back to idle

1997 PLYMOUTH VOYAGER
194,000 MILES • 6 CYL • 2WD • AUTOMATIC
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TMCNALR
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History: mother-in-laws van sat up for a year with blown up tranny. Replaced tranny. Tranny works well. While sitting in idle in driveway no problems. Going on test drives to test out tranny drove 10 miles fine went to slow down and engine stalled. Would not refire. After some research replaced idle air control. IAC was carboned up to the point it would not move. Engine ran smoother in idle tried to run up rpm's in driveway and then let off to reproduce result. Van didnt stall. IAC worked because when sitting in idle and turn ob AC the tach "caught up" to normal rpm. Test drive--Same result occurred--went to turn around after 10 miles and van stalled and wouldn't refire. Smelled like engine was running rich. EGR was replaced next. Visual inspection of old EGR was all catches up and don't see how it would open or close. Ran
smoother after replacement. Drive test was able to go the 10 miles turn around--stalled when turning on the street to the house. Pulled codes-O2 sensor popped up. Changed O2 and made the 10 mile trip and van stalled pulling into driveway. One thing I didn't mention in the beginning is I did pull codes before starting all this and only got a cooling fan circuit fault. The fans were hooked up directly the entire time
Oct 20, 2010 at 8:20 AM
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LEGITIMATE007
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hi,
strange indeed, try this, let the vehicle idle in the yard for as long as you can to see if it will stall, when and if it stalls we need to check spark, of course you will need someone to try to start it while checking for spark, I am suspecting the crank position sensor, and possibly cam sensor,(when it gets too warm it could be causing an open circuit). and this seems to be happening exactly at the same time. get back with your findings
Oct 20, 2010 at 9:04 AM
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LEGITIMATE007
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https://www.2carpros.com/how_to/how_to_check_fuel_pressure.htm
Oct 20, 2010 at 9:05 AM
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LEGITIMATE007
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https://www.2carpros.com/how_to/how_to_test_an_ignition_system.htm
Oct 20, 2010 at 9:06 AM
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LEGITIMATE007
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I meant to ask you, is there a check engine light on?
Oct 20, 2010 at 9:07 AM
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LEGITIMATE007
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did you scan for codes?
Oct 20, 2010 at 9:08 AM
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TMCNALR
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The light is on which initially led me to run the diagnostics. With this model you can check diagnostics by turning the key off and on three times. I pulled the code list from Autozone and got the cooling fan circuit relay and then later on the O2 sensor (after changing IAC and EGR). After changing these components does the computer have to "relearn".
Oct 20, 2010 at 9:25 AM
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TMCNALR
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Ran it in the driveway for thirty minutes without any issues. Turned it off and it started right back up
Oct 20, 2010 at 10:05 AM
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LEGITIMATE007
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I would test for spark and fuel at this point, and yes the computer will mostlikely relearn, try disconnecting, the negative battery cable for at least fifteen minutes, plug it back up and lets start from scratch, see if it causes anymore codes, and re learn if need be.
Oct 20, 2010 at 12:14 PM
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LEGITIMATE007
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its also very easy to get the wrong codes by doing the key cycling trick, so I would just go to autozone and have them scan them, and bring it back to us to look em up.
joe
Oct 20, 2010 at 12:18 PM
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TMCNALR
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Joe,

Went to Autozone and borrowed OBDII Scanner. The only codes we are getting is p1491 & 1495

Trey
Oct 20, 2010 at 3:44 PM
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TMCNALR
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Ok Joe, just duplicated the problem sitting in the driveway. The only thing different is that I turned it off after about 15 min then tried to restate and it wouldn't fire. Pulled codes after that and got the same 1491&1495 manufacturer control auxiliary emission controls on both code descriptions. It still smells like it is running rich to me
Oct 20, 2010 at 4:03 PM
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LEGITIMATE007
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I see a egr fault, did you say you replaced the egr?, when doing so, the passages must be cleaned also, and the latter of the codes, is "leak detection pump circuit fault.
Oct 22, 2010 at 10:03 AM
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TMCNALR
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Egr was replaced--my father in law actually put it on--I will take it back off and make sure it is clean. What is the leak detection pump? What does it do? Never dealt with one before

Trey
Oct 22, 2010 at 10:15 AM