no fuel/no spark - Pirate4x4.Com : 4x4 and Off-Road Forum

jeepbonehead · 05-27-2010, 03:54 PM

i have checked everything i can find, all fuses and relays are good, ignition switch is good fuel pump works well, i have no power running to my fuel pump and no spark. i've been going through everything for 2 days now and cant find my problem.

PumpkinCrusher · 05-27-2010, 05:32 PM

Need more details? Howell kit, OEM ?

Wolfghost · 05-27-2010, 07:03 PM

check engine light come on with the key in run position?

jeepbonehead · 05-28-2010, 12:37 AM

Quote:

Originally Posted by PumpkinCrusher

Need more details? Howell kit, OEM ?

wiring is all oem, fuel pump is an inline pump from summit.

Quote:

Originally Posted by Wolfghost

check engine light come on with the key in run position?

not the last time i tried

Wolfghost · 05-28-2010, 03:16 AM

check power and grounds to ecm, if it checks out replace ecm.

hy_desert_4wheeler · 05-28-2010, 05:12 AM

Quote:

Originally Posted by Wolfghost

check power and grounds to ecm, if it checks out replace ecm.

this would be my guess.. I had a similar problem with a Dodge truck,no codes no CEL...

jeepbonehead · 05-28-2010, 11:09 AM

ecm=computer?

PumpkinCrusher · 05-28-2010, 11:42 AM

Yes. Should be located behind the glove box.

jeepbonehead · 05-28-2010, 12:03 PM

i thought it's in the engine bay on the drivers side fire wall

jeepbonehead · 05-28-2010, 12:14 PM

just checked voltage to ecm, correct me if i'm wrong, positive is pink with yellow stripe and ground is black. with those i got 12 volts. could any sensors make my fuel and spark turn off

Wolfghost · 05-28-2010, 03:13 PM

yes cam position sensor and crank position sensor would make the ecm turn off fuel and spark BUT you would still have the check engine light, looks to me like you need an ecm.

FuzzyZ · 05-28-2010, 05:35 PM

Yup ECM would be the most likely cause that i can think of for the problems your haveing and not getting a CEL. All your voltage checks can be fine but if one of the boards in the ECM went bad ya got a problem there, not really a good way to check it with out swaping it or taking it in to get checked.

jeepbonehead · 05-28-2010, 09:22 PM

if i swap in a friends is there any chance of frying his? or should i be okay?

ONEtonXJ · 05-28-2010, 11:17 PM

what year and model is your rig??

used to have an '01 XJ... long story short....

XJ died... check engine light followed...

no fuel pressure...

replaced fuel pump...

still no fuel pressure...

check engine light revealed bad crank sensor...

so what im tryin to say here is... MYYY crank sensor.... turned off everthing...

jeepbonehead · 05-29-2010, 03:44 AM

i replaced the crank sensor already

burtv · 05-29-2010, 08:16 AM

do all other electrical components operate correctly?

jeepbonehead · 05-29-2010, 05:04 PM

fixed it. but after i replaced my ignition switch and my crank sensor the ecu was bad. i put a friends in that has the same year make model engine and trans and it came right to life. who know where the cheapest place is to get a new used or refirbished ecu

05-27-2010, 03:54 PM	#1 (permalink)
jeepbonehead Granite Guru Join Date: Feb 2009 Member # 130080 Location: New Fairfield, CT Posts: 718	no fuel/no spark i have checked everything i can find, all fuses and relays are good, ignition switch is good fuel pump works well, i have no power running to my fuel pump and no spark. i've been going through everything for 2 days now and cant find my problem.

05-28-2010, 03:16 AM	#5 (permalink)
Wolfghost Registered User Join Date: Nov 2008 Member # 123988 Location: Koontz Lake, IN Posts: 20	check power and grounds to ecm, if it checks out replace ecm. Last edited by Wolfghost; 05-28-2010 at 03:34 AM.

05-28-2010, 12:14 PM	#10 (permalink)
jeepbonehead Granite Guru Join Date: Feb 2009 Member # 130080 Location: New Fairfield, CT Posts: 718	just checked voltage to ecm, correct me if i'm wrong, positive is pink with yellow stripe and ground is black. with those i got 12 volts. could any sensors make my fuel and spark turn off Last edited by jeepbonehead; 05-28-2010 at 12:14 PM.

05-28-2010, 05:35 PM	#12 (permalink)
FuzzyZ Trailbusters4x4 club Join Date: Aug 2008 Member # 117547 Location: Vacaville, CA Posts: 1,332	Yup ECM would be the most likely cause that i can think of for the problems your haveing and not getting a CEL. All your voltage checks can be fine but if one of the boards in the ECM went bad ya got a problem there, not really a good way to check it with out swaping it or taking it in to get checked. __________________ 83 toy pickup, 02 TJ, 02 GMC 2500HD Trailbusters4x4 club Solano County Dont blame me i voted Republican! ECV 1004

05-28-2010, 11:17 PM	#14 (permalink)
ONEtonXJ Rock God Join Date: Nov 2009 Member # 145633 Location: Grand Junction, Crawlorado Posts: 1,336	what year and model is your rig?? used to have an '01 XJ... long story short.... XJ died... check engine light followed... no fuel pressure... replaced fuel pump... still no fuel pressure... check engine light revealed bad crank sensor... so what im tryin to say here is... MYYY crank sensor.... turned off everthing... __________________ "Tater2" - '91 2 door XJ. 4.0, AW4, 231/300 doubler, GM 60/70HD, 6.17s, ARB's & 4Ds

05-27-2010, 05:32 PM	#2 (permalink)
PumpkinCrusher Wheeler Join Date: Oct 2006 Member # 81449 Location: Sagamore Hills OH Posts: 303	Need more details? Howell kit, OEM ?

05-27-2010, 07:03 PM	#3 (permalink)
Wolfghost Registered User Join Date: Nov 2008 Member # 123988 Location: Koontz Lake, IN Posts: 20	check engine light come on with the key in run position?

05-28-2010, 11:09 AM	#7 (permalink)
jeepbonehead Granite Guru Join Date: Feb 2009 Member # 130080 Location: New Fairfield, CT Posts: 718	ecm=computer?

05-28-2010, 11:42 AM	#8 (permalink)
PumpkinCrusher Wheeler Join Date: Oct 2006 Member # 81449 Location: Sagamore Hills OH Posts: 303	Yes. Should be located behind the glove box.

05-28-2010, 12:03 PM	#9 (permalink)
jeepbonehead Granite Guru Join Date: Feb 2009 Member # 130080 Location: New Fairfield, CT Posts: 718	i thought it's in the engine bay on the drivers side fire wall

05-28-2010, 03:13 PM	#11 (permalink)
Wolfghost Registered User Join Date: Nov 2008 Member # 123988 Location: Koontz Lake, IN Posts: 20	yes cam position sensor and crank position sensor would make the ecm turn off fuel and spark BUT you would still have the check engine light, looks to me like you need an ecm.

05-28-2010, 09:22 PM	#13 (permalink)
jeepbonehead Granite Guru Join Date: Feb 2009 Member # 130080 Location: New Fairfield, CT Posts: 718	if i swap in a friends is there any chance of frying his? or should i be okay?

05-29-2010, 03:44 AM	#15 (permalink)
jeepbonehead Granite Guru Join Date: Feb 2009 Member # 130080 Location: New Fairfield, CT Posts: 718	i replaced the crank sensor already

05-29-2010, 08:16 AM	#16 (permalink)
burtv HARD ROCK VEGAS Join Date: Dec 2006 Member # 83644 Posts: 570	do all other electrical components operate correctly?

05-29-2010, 05:04 PM	#17 (permalink)
jeepbonehead Granite Guru Join Date: Feb 2009 Member # 130080 Location: New Fairfield, CT Posts: 718	fixed it. but after i replaced my ignition switch and my crank sensor the ecu was bad. i put a friends in that has the same year make model engine and trans and it came right to life. who know where the cheapest place is to get a new used or refirbished ecu

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