More Problems with My '89 XJ :-(

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More Problems with My '89 XJ :-(
Jeffery P . 8 April 2005 09:13:44
	Hey all! I am having a couple of problems with my 89 Cherokee and I was just wondering if anyone has any suggestions to help me track down and repair these problems. Any ideas would be very much appreciated, as always! Problem #1: When I first start the vehicle, drop her into "D" and start to drive everything seems fine but for the first few minutes it will stall out or the idle will drop really low every time I come to a stop unless I put into neutral and give it some gas. It does this for 2-3 minutes and then everything is fine. It does it at ALL temperatures, not just when cold. At any time I start the vehicle it goes through this same process all over again, even if the vehicle is only off for a couple of minutes. Problem #2: My PDL (power door locks) quit working so the first thing I checked was the circuit breaker at the fuse box. I found the breaker was super hot (I have the blisters to prove it) so I pulled it out with a pair of pliers and left it it cool down. Once it was cool I tried the same breaker in the Power Window slot and it was working fine and not heating up. I went to put the breaker back into the slot for the PDL and it sparked like crazy and my interior lights dimmer as I tried to put it in. Just to be sure it wasnt the breaker, I purchased a new one but the same thing happened-it let out a huge spark as I tried to put it in and in the 1/4 second it made contact, it got just as hot as the old one. I pulled both of the PDL switches out and checked for continuity in the wiring as well as all grounds/connections and switches and cant seem to see anything obvious. I put the breaker back in and checked for power but there is no power going to either switch. Any ideas??? Thanks a bunch. ********** * JEFFERY * ********** 89 Cherokee Laredo 4.0L, AT, Selectrac 4X4, A/T/C, PW, PDL
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L . W . Hughes III 8 April 2005 10:52:08 [ permanent link ]
	Hi Jeffrey, The cold fast idle is controlled by the step motor, and Throttle Position Sensors located on that body: http://members.cox.net/wilsond/tb/tb.html cleaning their connections may help. Some have reported sever corrosion in the power window harness passenger floor boards. God Bless America, Гџill O\|\|\|\|\|\|\|O mailto:LWHughes3rd@aol.com http://www.billhughes.com/ "Jeffery P." wrote:> Hey all!> I am having a couple of problems with my 89 Cherokee and I was just> wondering if anyone has any suggestions to help me track down and> repair these problems. Any ideas would be very much appreciated, as> always!> Problem #1:> When I first start the vehicle, drop her into "D" and start to drive> everything seems fine but for the first few minutes it will stall out> or the idle will drop really low every time I come to a stop unless I> put into neutral and give it some gas. It does this for 2-3 minutes> and then everything is fine. It does it at ALL temperatures, not just> when cold. At any time I start the vehicle it goes through this same> process all over again, even if the vehicle is only off for a couple> of minutes.> Problem #2:> My PDL (power door locks) quit working so the first thing I checked> was the circuit breaker at the fuse box. I found the breaker was super> hot (I have the blisters to prove it) so I pulled it out with a pair> of pliers and left it it cool down. Once it was cool I tried the same> breaker in the Power Window slot and it was working fine and not> heating up. I went to put the breaker back into the slot for the PDL> and it sparked like crazy and my interior lights dimmer as I tried to> put it in. Just to be sure it wasnt the breaker, I purchased a new one> but the same thing happened-it let out a huge spark as I tried to put> it in and in the 1/4 second it made contact, it got just as hot as the> old one. I pulled both of the PDL switches out and checked for> continuity in the wiring as well as all grounds/connections and> switches and cant seem to see anything obvious. I put the breaker back> in and checked for power but there is no power going to either switch.> Any ideas???> Thanks a bunch. > *********> JEFFERY > *********> 89 Cherokee Laredo> 4.0L, AT, Selectrac 4X4, A/T/C, PW, PDL
		Add comment


Odd-Inge 8 April 2005 15:44:34 [ permanent link ]
	I am no expert but have som sugestions: Problem #1 Check idle stepper motor unit and intake for gunk. Clean it. This is probably not the root of the problem. I think that the TPS (throtle position sensor) could be at fault. They come in single and double versions and works like a variable resistor. Controls both engine revs and gear change computer on an automatic. Does not like water and could become faulty after a good engine clean. Also there could be a problem with the vacum lines (leak somewhere) and/or the EGR valve sticking open. The latter you could do a visible check of when engine is running. Look closly at EGR to check that all 3 vacum lines are connected and nothing is broken. Problem #2 No idea, but had a similar problem with my 1990. Circuit breaker for windows became very hot. Voltmeter showing a clear drop periodicaly. Turned out that there was a short and the breaker kept on becoming hot, cuting power, cooling down etc etc. Turned out to be a short in the wiering harness to the left rear door, inside where the seatbelt is on a roller. Wiering had com loose and ratchet mechanism on setbelt had removed insulation. good luck Odd-Inge "Jeffery P." <jeepboynospam@mts.net> wrote in message news:9u3c511msbh06bvdrcgqebfnmrab0rmjaq@4ax.com...> Hey all!> I am having a couple of problems with my 89 Cherokee and I was just> wondering if anyone has any suggestions to help me track down and> repair these problems. Any ideas would be very much appreciated, as> always!> Problem #1:> When I first start the vehicle, drop her into "D" and start to drive> everything seems fine but for the first few minutes it will stall out> or the idle will drop really low every time I come to a stop unless I> put into neutral and give it some gas. It does this for 2-3 minutes> and then everything is fine. It does it at ALL temperatures, not just> when cold. At any time I start the vehicle it goes through this same> process all over again, even if the vehicle is only off for a couple> of minutes.> Problem #2:> My PDL (power door locks) quit working so the first thing I checked> was the circuit breaker at the fuse box. I found the breaker was super> hot (I have the blisters to prove it) so I pulled it out with a pair> of pliers and left it it cool down. Once it was cool I tried the same> breaker in the Power Window slot and it was working fine and not> heating up. I went to put the breaker back into the slot for the PDL> and it sparked like crazy and my interior lights dimmer as I tried to> put it in. Just to be sure it wasnt the breaker, I purchased a new one> but the same thing happened-it let out a huge spark as I tried to put> it in and in the 1/4 second it made contact, it got just as hot as the> old one. I pulled both of the PDL switches out and checked for> continuity in the wiring as well as all grounds/connections and> switches and cant seem to see anything obvious. I put the breaker back> in and checked for power but there is no power going to either switch.> Any ideas???> Thanks a bunch. > *********> JEFFERY > *********> 89 Cherokee Laredo> 4.0L, AT, Selectrac 4X4, A/T/C, PW, PDL
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Mike Romain 8 April 2005 18:54:06 [ permanent link ]
	For #1 I would clean all the connections on the throttle body with a spray contact cleaner. WD40 will work in a pinch. You could just be describing a dirty connection on the TPS which is fairly common on the older beasts. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's "Jeffery P." wrote:> Hey all!> I am having a couple of problems with my 89 Cherokee and I was just> wondering if anyone has any suggestions to help me track down and> repair these problems. Any ideas would be very much appreciated, as> always!> Problem #1:> When I first start the vehicle, drop her into "D" and start to drive> everything seems fine but for the first few minutes it will stall out> or the idle will drop really low every time I come to a stop unless I> put into neutral and give it some gas. It does this for 2-3 minutes> and then everything is fine. It does it at ALL temperatures, not just> when cold. At any time I start the vehicle it goes through this same> process all over again, even if the vehicle is only off for a couple> of minutes.> Problem #2:> My PDL (power door locks) quit working so the first thing I checked> was the circuit breaker at the fuse box. I found the breaker was super> hot (I have the blisters to prove it) so I pulled it out with a pair> of pliers and left it it cool down. Once it was cool I tried the same> breaker in the Power Window slot and it was working fine and not> heating up. I went to put the breaker back into the slot for the PDL> and it sparked like crazy and my interior lights dimmer as I tried to> put it in. Just to be sure it wasnt the breaker, I purchased a new one> but the same thing happened-it let out a huge spark as I tried to put> it in and in the 1/4 second it made contact, it got just as hot as the> old one. I pulled both of the PDL switches out and checked for> continuity in the wiring as well as all grounds/connections and> switches and cant seem to see anything obvious. I put the breaker back> in and checked for power but there is no power going to either switch.> Any ideas???> Thanks a bunch. > *********> JEFFERY > *********> 89 Cherokee Laredo> 4.0L, AT, Selectrac 4X4, A/T/C, PW, PDL
		Add comment


Will Honea 9 April 2005 00:56:20 [ permanent link ]
	I've been trying to get mine to play nice on cold start for 4 years now - and I've about given up. I'm pretty sure it's a problem with temperature and the computer somewhere. My throttle body and everything associated with it were one big heap of gunk when I got it and a really thorough cleaning got rid of the majority of the problems and changing the O2 sensor got rid of a lot more, but those all had sympthoms beyond just dying at the stop sign. For the first 2-3 minutes it still does that BUT only when the outside temperature is in the 50 degree range. Cleaning the throttle position sensor leads helps a little but the idle still drops way low at the stop sign at the bottom of the hill - sometimes it catches and is fine, sometimes it dies. If it's good and cold or nice and warm out, no problem - just that one temperature range that usually comes in the Spring and Fall. Aside from that, no problems so I've pretty much decided to leave it alone and expect it on those chilly but not cold mornings. On Fri, 8 Apr 2005 05:13:44 UTC Jeffery P. <jeepboynospam@mts.net> wrote: Hey all!> I am having a couple of problems with my 89 Cherokee and I was just> wondering if anyone has any suggestions to help me track down and> repair these problems. Any ideas would be very much appreciated, as> always!> Problem #1:> When I first start the vehicle, drop her into "D" and start to drive> everything seems fine but for the first few minutes it will stall out> or the idle will drop really low every time I come to a stop unless I> put into neutral and give it some gas. It does this for 2-3 minutes> and then everything is fine. It does it at ALL temperatures, not just> when cold. At any time I start the vehicle it goes through this same> process all over again, even if the vehicle is only off for a couple> of minutes.> Problem #2:> My PDL (power door locks) quit working so the first thing I checked> was the circuit breaker at the fuse box. I found the breaker was super> hot (I have the blisters to prove it) so I pulled it out with a pair> of pliers and left it it cool down. Once it was cool I tried the same> breaker in the Power Window slot and it was working fine and not> heating up. I went to put the breaker back into the slot for the PDL> and it sparked like crazy and my interior lights dimmer as I tried to> put it in. Just to be sure it wasnt the breaker, I purchased a new one> but the same thing happened-it let out a huge spark as I tried to put> it in and in the 1/4 second it made contact, it got just as hot as the> old one. I pulled both of the PDL switches out and checked for> continuity in the wiring as well as all grounds/connections and> switches and cant seem to see anything obvious. I put the breaker back> in and checked for power but there is no power going to either switch.> Any ideas???> Thanks a bunch. > *********> JEFFERY > *********> 89 Cherokee Laredo> 4.0L, AT, Selectrac 4X4, A/T/C, PW, PDL -- Will Honea
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Robb S via CarKB.com 9 April 2005 03:58:37 [ permanent link ]
	check this website out. Really helpful.....don't give up yet!! http://home.sprynet.com/~dale02/list.htm http://home.sprynet.com/~dale02/list.htm -- Message posted via http://www.carkb.com
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Will Honea 9 April 2005 06:23:39 [ permanent link ]
	Not much help there for a 4.0 MPI system <g>. On Fri, 8 Apr 2005 23:58:37 UTC "Robb S via CarKB.com" <forum@CarKB.com> wrote: check this website out. Really helpful.....don't give up yet!!> http://home.sprynet.com/~dale02/list.htm> http://home.sprynet.com/~dale02/list.htm> -- Will Honea
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Robb S via CarKB.com 9 April 2005 07:54:18 [ permanent link ]
	no, but he seems knowledgable...thought you might try to email him... -- Message posted via http://www.carkb.com
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More Problems with My '89 XJ :-(

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