Re: 89 Jeep Cherokee 4L Weird starting problem

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CarGuru > Jeep Willys > Re: 89 Jeep Cherokee 4L Weird starting problem 13 March 2005 05:53:19

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Re: 89 Jeep Cherokee 4L Weird starting problem
L . W . Hughes III 10 March 2005 09:12:23
	I could see a short in the brake light circuit sucking so much power that your computer wouldn't work, but disconnecting the line to that switch, and the engine won't run makes no sense, the line is terminated there. I once had a similar problem where is would hit the brakes and engine would die, but actually my knee was hitting the column where the ignition switch was coming apart. The only thing I could suggest is double check every connection, looking for hot spots where a couple of wire could have melted together. God Bless America, Гџill O\|\|\|\|\|\|\|O mailto:LWHughes3rd@aol.com http://www.billhughes.com/ Glen Hudgin wrote:> My Cherokee starts fine but as soon as I touch the brake pedal it kills the> engine. If I keep my foot on the brake pedal it won't start. I tried> disconnecting the wire to the brake light switch but if I do this it won't> start. The brake lights work fine and the hazard lights work so I don't> think the switch is the problem. Does anybody know what this problem is?> Glen
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Glen Hudgin 10 March 2005 07:03:52 [ permanent link ]
	My Cherokee starts fine but as soon as I touch the brake pedal it kills the engine. If I keep my foot on the brake pedal it won't start. I tried disconnecting the wire to the brake light switch but if I do this it won't start. The brake lights work fine and the hazard lights work so I don't think the switch is the problem. Does anybody know what this problem is? Glen
		Add comment


DougW 10 March 2005 16:20:38 [ permanent link ]
	Glen Hudgin did pass the time by typing:> My Cherokee starts fine but as soon as I touch the brake pedal it kills the> engine. If I keep my foot on the brake pedal it won't start. I tried> disconnecting the wire to the brake light switch but if I do this it won't> start. The brake lights work fine and the hazard lights work so I don't> think the switch is the problem. Does anybody know what this problem is?> Glen Without a wiring schematic I can't give you more than suggestions. First the basics: Do you have an aftermarket alarm system on your Jeep? Go through and check every fuse. Assuming you have an automatic transmission, try starting the Jeep in Neutral. (possibly the park safety/interlock switch) But that usually results in a no-start. <wild guess> Something in the ignition circuit has lost its ground and is finding one through the brake lamp system. (actually if something is, the lamps should glow) When you press the brakes that puts 12v to the lamp and interferes with the engine operation. Try putting a jumpercable between the engine block and the frame. If that works then it's your engine ground strap that has rotted. </wild guess> -- -- DougW -- 93 ZJ 4.0 http://members.cox.net/wilsond HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks Gibson Exhaust - rear DCpower - custom gauge install - Stillen Rotors Banks Header - and BEER, in the fridge!
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Mike Romain 10 March 2005 17:34:10 [ permanent link ]
	That should be a dead mesh ground strap from the rear of the engine head to the firewall. There is a 99% chance your vehicle is stealing the ground through the brake pedal and light circuit. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Glen Hudgin wrote:> My Cherokee starts fine but as soon as I touch the brake pedal it kills the> engine. If I keep my foot on the brake pedal it won't start. I tried> disconnecting the wire to the brake light switch but if I do this it won't> start. The brake lights work fine and the hazard lights work so I don't> think the switch is the problem. Does anybody know what this problem is?> Glen
		Add comment


Mike92105 10 March 2005 18:29:58 [ permanent link ]
	I believe there was a recall on the shift interlock switch not sure why but you might want to check that you are up to date on recalls. "Glen Hudgin" <protrak@sympatico.ca> wrote in message news:aOOXd.22868$fW4.681950@news20.bellglobal.com...> My Cherokee starts fine but as soon as I touch the brake pedal it kills > the> engine. If I keep my foot on the brake pedal it won't start. I tried> disconnecting the wire to the brake light switch but if I do this it won't> start. The brake lights work fine and the hazard lights work so I don't> think the switch is the problem. Does anybody know what this problem is?> Glen>
		Add comment


dave AKA vwdoc1 11 March 2005 06:33:20 [ permanent link ]
	Also see if the bake pedal hits some wiring for the ECM. When you hit the Brakes, does the tach drop dead instantly like the power was cut off? If so then I agree with ("Яill") -- later, dave AKA vwdoc1 88 XJ 4.0 auto "L.W. ("Яill") Hughes III" <billhughes@cox.net> wrote in message news:422FD737.BE216B6C@cox.net...> I could see a short in the brake light circuit sucking so much> power that your computer wouldn't work, but disconnecting the line to> that switch, and the engine won't run makes no sense, the line is> terminated there. I once had a similar problem where is would hit the> brakes and engine would die, but actually my knee was hitting the column> where the ignition switch was coming apart. The only thing I could> suggest is double check every connection, looking for hot spots where a> couple of wire could have melted together.> God Bless America, Яill O\|\|\|\|\|\|\|O> mailto:LWHughes3rd@aol.com http://www.billhughes.com/
		Add comment


Mike Romain 11 March 2005 18:38:48 [ permanent link ]
	Ok seeing as you have new ground straps, (everyone should know this), I would take a booster cable and run it from the battery negative to the firewall and see what happens. If no change, I would then turn on the emergency flashers and see if a) it starts with them on or b) it dies when they come on or c) they have no effect. There is one other place to check for a broken ground as well. Look on the passenger side of the engine near the back for a bolt with 2 or 3 small black wires coming off it. This is the ground for the computer harness. Have you had any wiring issues or melts or bad electrical smells? Anything like the 4x4 light stuck on or anything else unusual? Mike Mike Romain wrote:> That should be a dead mesh ground strap from the rear of the engine head> to the firewall.> There is a 99% chance your vehicle is stealing the ground through the> brake pedal and light circuit.> Mike> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00> 88 Cherokee 235 BFG AT's> Glen Hudgin wrote:> > My Cherokee starts fine but as soon as I touch the brake pedal it kills the> > engine. If I keep my foot on the brake pedal it won't start. I tried> > disconnecting the wire to the brake light switch but if I do this it won't> > start. The brake lights work fine and the hazard lights work so I don't> > think the switch is the problem. Does anybody know what this problem is?> > Glen
		Add comment


Glen Hudgin 13 March 2005 02:22:14 [ permanent link ]
	Problem solved. It was a bad ground wire, apparently for the computer or control unit. Thanks for all the input. "mike92105" <mike92105@cox.net> wrote in message news:XRYXd.58092$%U2.49331@lakeread01...>I believe there was a recall on the shift interlock switch not sure why but >you might want to check that you are up to date on recalls.> "Glen Hudgin" <protrak@sympatico.ca> wrote in message > news:aOOXd.22868$fW4.681950@news20.bellglobal.com...>> My Cherokee starts fine but as soon as I touch the brake pedal it kills >> the>> engine. If I keep my foot on the brake pedal it won't start. I tried>> disconnecting the wire to the brake light switch but if I do this it >> won't>> start. The brake lights work fine and the hazard lights work so I don't>> think the switch is the problem. Does anybody know what this problem is?>> Glen>>
		Add comment


L . W . Hughes III 13 March 2005 05:53:19 [ permanent link ]
	Hi Glen, Thanks for telling us. It's unbelievable how many times it's Mike's infamous engine ground strap. God Bless America, Гџill O\|\|\|\|\|\|\|O mailto:LWHughes3rd@aol.com http://www.billhughes.com/ Glen Hudgin wrote:> Problem solved. It was a bad ground wire, apparently for the computer or> control unit.> Thanks for all the input.
		Add comment

CarGuru > Jeep Willys > Re: 89 Jeep Cherokee 4L Weird starting problem 13 March 2005 05:53:19

	see also: TRANSAM: 2005 season in review F1: Clean qualifying lap for Doornbos SCCA-WC: Mosport GT practice 2 times		pass tests:		see also: 4e za dephizit zapisei 1996 Acura Integra 91 lumina trans axel locked

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Re: 89 Jeep Cherokee 4L Weird starting problem

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