98 C1500 No Fire

prcfan · 09-18-2007, 10:42 AM

I was driving along and the truck quit without warning. I changed the coil and module what else would cause it not to fire? Its a 5.7 liter.

scottie · 09-18-2007, 11:14 AM

can ya give us a lil more info, this is kinda vague

75K30 · 09-18-2007, 11:30 AM

Are you sure it is actually spark related?

jktuck · 09-18-2007, 01:47 PM

sounds like you may have a fuel pump issue.

prcfan · 09-18-2007, 06:54 PM

Quote:

Originally Posted by scottie

can ya give us a lil more info, this is kinda vague

OK I got in it today and tried to crank it starts and quits right away. It has 60 psi fuel pressure and drops to 58 when it cranks. Its like you turn the key off I also held the key on when it cranked keeping starter engaged but it still quits. Its crazy because the other day it did not have spark at all. The crankshaft sensor went out about 6 months ago with the same symptoms. It has fuel and fire until it cranks then it quits. The coil is good the module is good the pump is brand new all thats left is?

jktuck · 09-19-2007, 09:16 AM

Do you have oil pressure for the short time it runs?

medic3616@sbcgl · 09-19-2007, 10:35 AM

have you checked your fuel filter? if it is similar to my 1991 there is a coffee can sized inline filter along the frame rail near the fuel tank, not difficult to change. also check to see if it has an evaporation condenser on top of the tank, this can fill with water and cause similar problems.

prcfan · 09-19-2007, 12:26 PM

Quote:

Originally Posted by jktuck

Do you have oil pressure for the short time it runs?

When it cranks I can hear the lifters tapping for a brief moment. The gauge is not working. Does it have a safety feature on it? It did not tap when it killed on me.

crabtruck · 09-19-2007, 12:30 PM

Oil gauge not working ? That could tell the problem - check the plug for the oil sender.
If the computer thinks there is no oil it will shut off.
Your run time may just be burning the gas already there.

What year is this ?

jktuck · 09-19-2007, 01:04 PM

yes, it sounds like you may have a bad oil sending unit. Remove the sending unit and put an oil pressure tester in it's place. turn over the engine ( it does not have to start ) several consecutive times to see if you have pressure. If so, replace the sending unit. If not, then you may have a bad oil pump.

09-18-2007, 10:42 AM	#1
prcfan Junior Member Join Date: Sep 2007 Posts: 3	98 C1500 No Fire I was driving along and the truck quit without warning. I changed the coil and module what else would cause it not to fire? Its a 5.7 liter.

09-18-2007, 11:14 AM	#2
scottie Senior Member Join Date: Jan 2006 Location: South Florida (Palm Beach), originally from south of BOSTON Posts: 644	can ya give us a lil more info, this is kinda vague __________________ im a straight shooter with upper management written all over me

09-18-2007, 01:47 PM	#4
jktuck Senior Member Join Date: Oct 2006 Posts: 76	sounds like you may have a fuel pump issue. __________________ Jeff Tuck ( me likes me some GMs ) 1968 Chevy C10 straight 6 1989 Chevy S10 v6 4.3 1994 Chevy Silverado Z71 4X4 v8 5.7 1999 GMC Jimmy v6 4.3

09-19-2007, 09:16 AM	#6
jktuck Senior Member Join Date: Oct 2006 Posts: 76	Do you have oil pressure for the short time it runs? __________________ Jeff Tuck ( me likes me some GMs ) 1968 Chevy C10 straight 6 1989 Chevy S10 v6 4.3 1994 Chevy Silverado Z71 4X4 v8 5.7 1999 GMC Jimmy v6 4.3

09-19-2007, 01:04 PM	#10
jktuck Senior Member Join Date: Oct 2006 Posts: 76	yes, it sounds like you may have a bad oil sending unit. Remove the sending unit and put an oil pressure tester in it's place. turn over the engine ( it does not have to start ) several consecutive times to see if you have pressure. If so, replace the sending unit. If not, then you may have a bad oil pump. __________________ Jeff Tuck ( me likes me some GMs ) 1968 Chevy C10 straight 6 1989 Chevy S10 v6 4.3 1994 Chevy Silverado Z71 4X4 v8 5.7 1999 GMC Jimmy v6 4.3

09-18-2007, 11:30 AM	#3
75K30 Senior Member Join Date: Jul 2006 Posts: 2,518	Are you sure it is actually spark related?

09-19-2007, 10:35 AM	#7
medic3616@sbcgl Full Member Join Date: Aug 2007 Location: michigan Posts: 19	have you checked your fuel filter? if it is similar to my 1991 there is a coffee can sized inline filter along the frame rail near the fuel tank, not difficult to change. also check to see if it has an evaporation condenser on top of the tank, this can fill with water and cause similar problems.

09-19-2007, 12:30 PM	#9
crabtruck Senior Member Join Date: Jul 2007 Posts: 1,464	Oil gauge not working ? That could tell the problem - check the plug for the oil sender. If the computer thinks there is no oil it will shut off. Your run time may just be burning the gas already there. What year is this ?

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