help! - Page 3

leolkfrm · 10-25-2009, 06:36 PM

since dumping fuel into it makes it start to run, you need to diagnose why it is not getting fuel. don't throw parts at it and hope it's to expensive

SanshzJ65 · 10-25-2009, 08:16 PM

Replace your distributor ignition control module, and maybe your gas pump relay.

BernieB · 10-25-2009, 10:01 PM

Quote:

Originally Posted by SanshzJ65

Replace your distributor ignition control module, and maybe your gas pump relay.

I'd say both of those are pretty unlikely to be the cause of this problem. For one, he has good pressure at the TBI (see post #1) and two, it runs if you put a little gas down the throttle body (see post #6), which rules out ignition module.

snider777 · 10-25-2009, 10:57 PM

i appriacate all the help guys.... it dont run run when i put gas in the throttle body it just runs for a second... and i am trying to see why the tbi injectors are not spraying gas. its geting gas all the way to the throttle body and stoping so bernie said check the wires on the tbi and i just did there bad i beliieve. so the next step in replace ecm or try some sensors first? i dont know where the ecm is located or sensors.

snider777 · 10-29-2009, 10:37 PM

dont nkow where to start on this pos

gregd · 10-29-2009, 11:45 PM

snider, you still here? let's drop back twenty and start over. okay, you have an '89 with the 5.7, right? van, pickup, suburban???? to check the codes, first find the diagnostic plug. if it's a pickup like mine it should be under the dash near your left knee? now you have 2 choices, go buy a code reader for the OBD I system or get/make a jumper and connect pin A(ground) to pin B. that will cause your Check Engine light to flash in a sequence if any codes are set in the ECM, 2 flashes, pause, 4 flashes means a 24 code. if you do not have a Chilton's or Haynes manual yet, i've got mine sitting next to me, let me know.

snider777 · 10-31-2009, 11:17 AM

thanks alot man. its a truck ext cab 89 gmc 5.7 ill look into doing the code thing and get back to you....

leolkfrm · 10-31-2009, 12:07 PM

ok so it is narrowed down to something not allowing the injectors to fire, since dumping gas down works the ingition side is fine. can you keep it running if you use a sprayer to add gas? this would prove that the inition is fine (moudule etc). a switch or sensor is not sending a signal to the ecm, when cranking do you have oil pressure? does the guage go up or light go off?

scavanger · 10-31-2009, 01:42 PM

Don't know if this was done. Use an analog volt meter and connect it to one of the injector wires and crank it. the needle should pulse. A digital might not read the injector pulse current, not quick enough .

Scav.

snider777 · 11-01-2009, 02:12 PM

i dont think the oil gauge works. it was out when i bought it. so i need to spray gas into the tbi and see if it stays running? and i will test the wires oin the injectors also then get back to you guys thanks!

10-25-2009, 06:36 PM	#21
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,300	since dumping fuel into it makes it start to run, you need to diagnose why it is not getting fuel. don't throw parts at it and hope it's to expensive __________________ 4 wheels move the body 2 wheels move the soul B.W.A.I

10-29-2009, 11:45 PM	#26
gregd Full Member Join Date: Jul 2009 Location: Long Beach, CA Posts: 26	help! snider, you still here? let's drop back twenty and start over. okay, you have an '89 with the 5.7, right? van, pickup, suburban???? to check the codes, first find the diagnostic plug. if it's a pickup like mine it should be under the dash near your left knee? now you have 2 choices, go buy a code reader for the OBD I system or get/make a jumper and connect pin A(ground) to pin B. that will cause your Check Engine light to flash in a sequence if any codes are set in the ECM, 2 flashes, pause, 4 flashes means a 24 code. if you do not have a Chilton's or Haynes manual yet, i've got mine sitting next to me, let me know.

10-31-2009, 12:07 PM	#28
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,300	ok so it is narrowed down to something not allowing the injectors to fire, since dumping gas down works the ingition side is fine. can you keep it running if you use a sprayer to add gas? this would prove that the inition is fine (moudule etc). a switch or sensor is not sending a signal to the ecm, when cranking do you have oil pressure? does the guage go up or light go off? __________________ 4 wheels move the body 2 wheels move the soul B.W.A.I

11-01-2009, 02:12 PM	#30
snider777 Full Member Join Date: Oct 2009 Posts: 26	ok i dont think the oil gauge works. it was out when i bought it. so i need to spray gas into the tbi and see if it stays running? and i will test the wires oin the injectors also then get back to you guys thanks!

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10-25-2009, 08:16 PM	#22
SanshzJ65 Junior Member Join Date: Oct 2009 Posts: 3	Replace your distributor ignition control module, and maybe your gas pump relay.

10-25-2009, 10:57 PM	#24
snider777 Full Member Join Date: Oct 2009 Posts: 26	i appriacate all the help guys.... it dont run run when i put gas in the throttle body it just runs for a second... and i am trying to see why the tbi injectors are not spraying gas. its geting gas all the way to the throttle body and stoping so bernie said check the wires on the tbi and i just did there bad i beliieve. so the next step in replace ecm or try some sensors first? i dont know where the ecm is located or sensors.

10-29-2009, 10:37 PM	#25
snider777 Full Member Join Date: Oct 2009 Posts: 26	dont nkow where to start on this pos

10-31-2009, 11:17 AM	#27
snider777 Full Member Join Date: Oct 2009 Posts: 26	thanks alot man. its a truck ext cab 89 gmc 5.7 ill look into doing the code thing and get back to you....

10-31-2009, 01:42 PM	#29
scavanger Senior Member Join Date: May 2007 Posts: 262	Don't know if this was done. Use an analog volt meter and connect it to one of the injector wires and crank it. the needle should pulse. A digital might not read the injector pulse current, not quick enough . Scav.