01 cherokee sport starting problem

red rider · 08-01-2009, 07:17 AM

2001 Sport 4.0. 100K I've been chasing a starting problem and need help before I end up at the dealer.
On cold start I have to turn the engine over at least twice before it starts (3-4 revolutions, stop, start again and it will run). It then misses for 10/20 seconds. After revving the engine the miss will clear and it seems to run fine and will start okay until it has cooled down completely. I still have to use a two-step starting procedure though. Turn it over for 3 or 4 revolutions, stop, then turn it over again before it goes.
I've gotten a check engine code of " PO301-misfire on # 1 cylinder" about 5/6 times and one code of " PO340-crankshaft position sensor malfunction".
I changed the Crankshaft sensor with no change in starting.
I replaced the Coil Rail with no change in starting.
I replaced the plugs twice.
Can anyone direct me to a fix before the dealer gets me.
Thanks

jd4x426 · 08-01-2009, 08:40 AM

make sure that the plug for the cps is plugged in good and the terminals are clean when it doesnt start have you checked to see if it has fuel and spark its missing one or the other and that will help diagnose your problem better

red rider · 08-01-2009, 11:31 AM

I replaced the CPS and cleaned the connection, applied dielc. grease. I'll check the fuel pressure. Filter is in the tank, so if pressure in off I guess the next step is pull the tank and change the pump/filter.
Anyone else cared to chime-in, would appreciate it.

red rider · 08-01-2009, 11:54 AM

Okay, checked fuel pressure while running at injector rail. 45 psi. Sound right?

JeepCoMJ · 08-01-2009, 12:11 PM

thats good.

remember...just because parts are new doesnt mean they're good

08-01-2009, 08:40 AM	#2
jd4x426 Senior Member Garage is empty, add now Join Date: Jan 2009 Posts: 920 My Photos 1996 Cherokee Engine: 4.0 Transmission: ax-15 Transfer Case: NP-231 Front Axle: d-30 Rear Axle: chrysler 8.25 Tires: 31x10.5x15 Lift Specifications: 3" RC series 2 Misc Accessories: homade intake and homemade discos	make sure that the plug for the cps is plugged in good and the terminals are clean when it doesnt start have you checked to see if it has fuel and spark its missing one or the other and that will help diagnose your problem better __________________ BUILD EM DONT BUY EM

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08-01-2009, 11:31 AM	#3
red rider Newbie Garage is empty, add now Join Date: Aug 2009 Posts: 9 My Photos Cherokee	I replaced the CPS and cleaned the connection, applied dielc. grease. I'll check the fuel pressure. Filter is in the tank, so if pressure in off I guess the next step is pull the tank and change the pump/filter. Anyone else cared to chime-in, would appreciate it.

08-01-2009, 11:54 AM	#4
red rider Newbie Garage is empty, add now Join Date: Aug 2009 Posts: 9 My Photos Cherokee	Okay, checked fuel pressure while running at injector rail. 45 psi. Sound right?

08-01-2009, 12:11 PM	#5
JeepCoMJ CF Veteran Garage is empty, add now Join Date: Nov 2008 Posts: 1,933 My Photos 1987 Cherokee Engine: 4.0 Transmission: aw4 Transfer Case: 231 SYE Front Axle: hp dana 30 disco 4.11's Rear Axle: dana 44 4.09's Tires: 33x10.50 BFG AT/KO's Lift Specifications: Comanche. 6.5" RC w/ YJ brake lines, SOA rear lift with dakota brake hose. upgrading to '95 HO Misc Accessories: built front bumper, manual vacuum disconnect, etc.	thats good. remember...just because parts are new doesnt mean they're good

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