Jeep question

98FireyGT! · February 11th, 2010, 04:22 AM

So today I go and put gas in the Jeep (97 Grand Cherokee, I6) and when I go to start it back up, it cranks but wouldn't start. I hit the gas while turning the key to the "start" position and it would rev up perfectly fine but as soon as I went to let it idle it would die. I finally figured, ok, it's revving, and I need to get out of the gas pump, so I turned the key to the on position, feathered the gas to just under 1k RPM and then stuck it in drive. After banging it into gear, it ran normal, idled just fine, and I drove into town, hung out with my gf for a few hours, and then drove home, no issues.

Any thoughts? I was leaning toward IAC but not entirely sure. It does have a pulley that squeaks like hell until the motor warms up and a few other little gremlins but nothing (that I knew of) major till now.

Trick Tuners · February 11th, 2010, 11:28 AM

I have hear of this on the jeep engines when its super cold. Post it up on JeepForum.com

97S281 · February 11th, 2010, 06:14 PM

Oh no, NOT THE GREMLINS!!!!!!!!!

No clue, good luck with that.

98FireyGT! · February 11th, 2010, 06:48 PM

Yeaah, like a dumbass I fed them after midnight.

97S281 · February 11th, 2010, 07:09 PM

that's OK, Just don't get them wet!!!!

HMUSN · February 11th, 2010, 09:09 PM

4.0's don't like the cold starts. Could be a battery or cps issue.

winnie51189 · February 11th, 2010, 10:32 PM

I have the same issues in the cold with mine, just won't start cold. But it doesn't bother me, I must be use to it.

HMUSN · February 11th, 2010, 10:33 PM

You should check out the Optima batteries.

They are good for cold cranking and are gel type.

Nothing like a tractor battery though.. those damn things last 25 years.

Steelsoldi3r · February 11th, 2010, 10:35 PM

Tractors FTW! haha

Thumbie · February 11th, 2010, 10:56 PM

that happened to the stang once...it WAS really cold out

winnie51189 · February 11th, 2010, 11:10 PM

I have a trickle charger on the jeep in the winter just in case I might need it, like when it decided to snow 5in right after I got home. Can't wait until summer, so I can start fabbing up some shit for the jeep. New bumpers and rear quarter panels here I come.

98FireyGT! · February 12th, 2010, 04:09 AM

I'll check out the battery, maybe get a red top like the one in my mustang. It worries me that I have to basically neutral drop it to get it running. Granted I make sure the RPM's are <1k but still I can't imagine it's all that great on it.

CPS? Crank position sensor? Or something else?

February 11th, 2010, 04:22 AM	#1
98FireyGT! Hardon Enflooziast '94 GT Vert Havn't tried... Join Date: Oct 2009 Location: Spokane Posts: 3,360 iTrader: 0 reviews	Jeep question So today I go and put gas in the Jeep (97 Grand Cherokee, I6) and when I go to start it back up, it cranks but wouldn't start. I hit the gas while turning the key to the "start" position and it would rev up perfectly fine but as soon as I went to let it idle it would die. I finally figured, ok, it's revving, and I need to get out of the gas pump, so I turned the key to the on position, feathered the gas to just under 1k RPM and then stuck it in drive. After banging it into gear, it ran normal, idled just fine, and I drove into town, hung out with my gf for a few hours, and then drove home, no issues. Any thoughts? I was leaning toward IAC but not entirely sure. It does have a pulley that squeaks like hell until the motor warms up and a few other little gremlins but nothing (that I knew of) major till now. __________________ Bridget: 98 Mustang GT - PI Swapped, J-Mod and B&M Shifter...wrapped it around a tree sparing a deer - RIP Sephie: 94 Mustang GT Vert - Full 03 cobra suspension and brakes, Magnaflow catback, K&N drop in filter, timed at 12*, SS brake lines,

February 11th, 2010, 11:28 AM	#2
Trick Tuners MM Fanatic KB'd GT Join Date: Nov 2006 Location: San Diego Posts: 4,471 iTrader: 3 reviews	I have hear of this on the jeep engines when its super cold. Post it up on JeepForum.com __________________ Check out my forums for stuff on troubleshooting, tuning, etc We teamed up with Socal Performance Racing to bring dyno tuning to San Diego. Be friends with us on FB

February 11th, 2010, 06:14 PM	#3
97S281 Rollin' 18/ pushin' 2 1997 Saleen S281 Join Date: Feb 2007 Location: Zebulon N.C. Posts: 6,259 iTrader: 13 reviews	Oh no, NOT THE GREMLINS!!!!!!!!! No clue, good luck with that. __________________ MODS IN GARAGE NCMM ORIGINAL BLOWN 96-98 CREW MEMBER # 1

February 11th, 2010, 06:48 PM	#4
98FireyGT! Hardon Enflooziast '94 GT Vert Havn't tried... Join Date: Oct 2009 Location: Spokane Posts: 3,360 iTrader: 0 reviews	Yeaah, like a dumbass I fed them after midnight. __________________ Bridget: 98 Mustang GT - PI Swapped, J-Mod and B&M Shifter...wrapped it around a tree sparing a deer - RIP Sephie: 94 Mustang GT Vert - Full 03 cobra suspension and brakes, Magnaflow catback, K&N drop in filter, timed at 12*, SS brake lines,

February 11th, 2010, 07:09 PM	#5
97S281 Rollin' 18/ pushin' 2 1997 Saleen S281 Join Date: Feb 2007 Location: Zebulon N.C. Posts: 6,259 iTrader: 13 reviews	that's OK, Just don't get them wet!!!! __________________ MODS IN GARAGE NCMM ORIGINAL BLOWN 96-98 CREW MEMBER # 1

February 11th, 2010, 09:09 PM	#6
HMUSN Doc 1986 SVO Join Date: Nov 2006 Posts: 36,836 iTrader: 9 reviews	4.0's don't like the cold starts. Could be a battery or cps issue. __________________

February 11th, 2010, 10:32 PM	#7
winnie51189 Hardcore Enthusiast 2000 Mustang v6 Join Date: Jul 2008 Location: Evansville, Indiana Posts: 1,294 iTrader: 3 reviews	I have the same issues in the cold with mine, just won't start cold. But it doesn't bother me, I must be use to it. __________________ FOR SALE: v6 cam SPECS: 207/215 110lsa

February 11th, 2010, 10:33 PM	#8
HMUSN Doc 1986 SVO Join Date: Nov 2006 Posts: 36,836 iTrader: 9 reviews	You should check out the Optima batteries. They are good for cold cranking and are gel type. Nothing like a tractor battery though.. those damn things last 25 years. __________________ Last edited by HMUSN; February 11th, 2010 at 10:37 PM. Reason: spelling T.

February 11th, 2010, 10:35 PM	#9
Steelsoldi3r Regular 1996 Mustang GT Join Date: Jan 2010 Location: Deer Park, Texas Posts: 257 iTrader: 0 reviews	Tractors FTW! haha __________________ 3.55 gears, Cai, magnaflow exhaust, advanced timing to 12 degrees,underdrive pullies, throttle body spacer, plenum intake spacer, BBK o/r H-pipe, king cobra clutch....havent gone to the dyno, more to come

February 11th, 2010, 10:56 PM	#10
Thumbie Hardcore Enthusiast 2001 Cobra 14.2@102 (I suck) Join Date: Apr 2009 Location: SF Bay Area, CA Posts: 1,621 iTrader: 0 reviews	that happened to the stang once...it WAS really cold out __________________ 2001 Cobra with SRA swap, modded for twisties MM Cobra Club Member #76

February 11th, 2010, 11:10 PM	#11
winnie51189 Hardcore Enthusiast 2000 Mustang v6 Join Date: Jul 2008 Location: Evansville, Indiana Posts: 1,294 iTrader: 3 reviews	I have a trickle charger on the jeep in the winter just in case I might need it, like when it decided to snow 5in right after I got home. Can't wait until summer, so I can start fabbing up some shit for the jeep. New bumpers and rear quarter panels here I come. __________________ FOR SALE: v6 cam SPECS: 207/215 110lsa

February 12th, 2010, 04:09 AM	#12
98FireyGT! Hardon Enflooziast '94 GT Vert Havn't tried... Join Date: Oct 2009 Location: Spokane Posts: 3,360 iTrader: 0 reviews	I'll check out the battery, maybe get a red top like the one in my mustang. It worries me that I have to basically neutral drop it to get it running. Granted I make sure the RPM's are <1k but still I can't imagine it's all that great on it. CPS? Crank position sensor? Or something else? __________________ Bridget: 98 Mustang GT - PI Swapped, J-Mod and B&M Shifter...wrapped it around a tree sparing a deer - RIP Sephie: 94 Mustang GT Vert - Full 03 cobra suspension and brakes, Magnaflow catback, K&N drop in filter, timed at 12*, SS brake lines,

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