98 gmc cranks but no start please help - Page 2

hotrodpc · 11-02-2009, 10:39 PM

How about check the underhood fuse box. I think GM calls it the Power Management center or something like that. Maybe shorted out a fuse or something. But you say, you are getting plenty of fuel pressure. Just not getting it to the injectors. But still the injectors are electronic, and if they are not opening, still worth a try. I think for poops and giggles, I'd find a manual and ohms test the crankshaft sensor too. Just because.

98gmc1500 · 11-02-2009, 10:56 PM

well it has a new crank shaft sensor as well as the sensor in the distributor all fuses are good getting great fuel pressure to the injector pack but injector pack not getting any pulse fire ..

98gmc1500 · 11-02-2009, 10:57 PM

would the sensor at the rear of engine block have anything to do with it ..i believe they call it the knock sensor

hotrodpc · 11-02-2009, 11:05 PM

Quote:

Originally Posted by 98gmc1500

would the sensor at the rear of engine block have anything to do with it ..i believe they call it the knock sensor

I would think not. Its my understanding, the knock sensor just instantly and temporarily retards the timing to get rid of the knock and should not have anything to do with the fuel.

98gmc1500 · 11-03-2009, 12:09 AM

ok well im getting plenty of fuel im just not getting any injector pulse

leolkfrm · 11-03-2009, 06:27 AM

so, did you check the oil pressure switch and the ecm temp switch? either one will shut down the pulse, since it runs when you dump fuel down, either one will shut it down

98gmc1500 · 11-03-2009, 08:58 AM

not yet where is the ecm temp switch located?

leolkfrm · 11-03-2009, 10:28 AM

usually in the head, being obd2, you could put a scanner(not code reader) on it and see what is not sending info to the ecm

98gmc1500 · 11-03-2009, 11:59 AM

ok check the oil sender but found out that it is only for oil pressure and fuel sensor it has nothing to do with the distr. replaced the temp sensor on head and in front of the intake ..still no start ..now could the egr valve have something to do with it ..now remember it runs when i pour gas directly into the throttle body

1500cheyenne96 · 11-03-2009, 03:54 PM

Not sure if this was answered yet but when its cranking have you hit the manual bleed on the fuel line just to make sure you got gas that far? also have you tested the f.p regulator? and double check the injector harness from the computer to fuel body also. try pulling the top of the fuel body off and check to make sure that is making good contact. hope this helps

11-02-2009, 10:39 PM	#11
hotrodpc Senior Member Join Date: Jul 2008 Location: OKC, OK Posts: 3,177	How about check the underhood fuse box. I think GM calls it the Power Management center or something like that. Maybe shorted out a fuse or something. But you say, you are getting plenty of fuel pressure. Just not getting it to the injectors. But still the injectors are electronic, and if they are not opening, still worth a try. I think for poops and giggles, I'd find a manual and ohms test the crankshaft sensor too. Just because. __________________ *Winners NEVER Quit , Quitters NEVER Win !!!*

11-03-2009, 06:27 AM	#16
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,300	so, did you check the oil pressure switch and the ecm temp switch? either one will shut down the pulse, since it runs when you dump fuel down, either one will shut it down __________________ 4 wheels move the body 2 wheels move the soul B.W.A.I

11-03-2009, 10:28 AM	#18
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,300	usually in the head, being obd2, you could put a scanner(not code reader) on it and see what is not sending info to the ecm __________________ 4 wheels move the body 2 wheels move the soul B.W.A.I

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11-02-2009, 10:56 PM	#12
98gmc1500 Junior Member Join Date: Nov 2009 Posts: 11	well it has a new crank shaft sensor as well as the sensor in the distributor all fuses are good getting great fuel pressure to the injector pack but injector pack not getting any pulse fire ..

11-02-2009, 10:57 PM	#13
98gmc1500 Junior Member Join Date: Nov 2009 Posts: 11	would the sensor at the rear of engine block have anything to do with it ..i believe they call it the knock sensor

11-03-2009, 12:09 AM	#15
98gmc1500 Junior Member Join Date: Nov 2009 Posts: 11	ok well im getting plenty of fuel im just not getting any injector pulse

11-03-2009, 08:58 AM	#17
98gmc1500 Junior Member Join Date: Nov 2009 Posts: 11	not yet where is the ecm temp switch located?

11-03-2009, 11:59 AM	#19
98gmc1500 Junior Member Join Date: Nov 2009 Posts: 11	ok check the oil sender but found out that it is only for oil pressure and fuel sensor it has nothing to do with the distr. replaced the temp sensor on head and in front of the intake ..still no start ..now could the egr valve have something to do with it ..now remember it runs when i pour gas directly into the throttle body

11-03-2009, 03:54 PM	#20
1500cheyenne96 Senior Member Join Date: Sep 2009 Location: MIchigan Posts: 206	Not sure if this was answered yet but when its cranking have you hit the manual bleed on the fuel line just to make sure you got gas that far? also have you tested the f.p regulator? and double check the injector harness from the computer to fuel body also. try pulling the top of the fuel body off and check to make sure that is making good contact. hope this helps