92 wont start

92chevyguy · 11-04-2009, 10:25 PM

I have a 92 chevy with tbi 350. It was running fine today and then it started bogging down like it wasnt getting fuel. So i replaced the fuel filter on the frame. Problem still existed. checked the injectors and they seem ok. changed the fuel pump and yet again the problem still is there..... Any ideas on what else it could be....

BernieB · 11-04-2009, 10:44 PM

Start looking at your "combustion triad" (air/fuel, compression, ignition) and see where it leads you.

In your case, we'll assume you have compression, so that leaves the air/fuel mixture and ignition left to check. You've already checked half of the air/fuel leg of the triad, so maybe you'll want to look at the "air" portion of that. How's the airflow? Clean filter? Nothing blocking the intake?

shadygrady · 11-05-2009, 01:16 AM

I could be wrong but this is my experience.Ive found most of the time with my vehicles ignition components wear out the fastest and most often.Ive never had to change a fuel pump and never had anything block or clog the intake track.I am however about to change the fuel pump on my iroc.180,000 miles and its still going,i just need to upgrade to a 255 L/hr.My friends stock pump lasted 200,000 miles.
If its a well maintained truck i.e. clean air filter,maintained fuel system its prolly a bad set of plugs,wires,cap,rotor or maybe an ignition module or coil.Ive had all of these fail on me.However when the coil or the module fail you should get a no crank situation.Good luck

Oh i just remembered and noticed your thred title was NO START.Do you have spark?

gmctrucks · 11-05-2009, 03:03 AM

Welcome to the forum and howdy from TEXAS. What brand fuel pump did you buy? Check your fuel pressure. Now im not saying that im right but it's a idea. Shady don't forget to buy a Delphi pump look how long the OEM has lasted.
Good luck! GMC

leolkfrm · 11-05-2009, 05:29 AM

is it no start or running bad, might have pinched a fuel line putting the pump in, so you are chasing the original solution

92chevyguy · 11-05-2009, 07:37 AM

it stays running if you give it gas. but if you try to give it more gas it dies like its not getting enough fuel orr something

BernieB · 11-05-2009, 07:42 AM

Quote:

Originally Posted by 92chevyguy

it stays running if you give it gas. but if you try to give it more gas it dies like its not getting enough fuel orr something

Try giving it a bit more gas, and when it starts to die give it a shot of starter fluid. If it revs then it's not getting enough fuel or is getting too much air. If it still dies then it's getting too much fuel and not enough air, or has ignition problems.

92chevyguy · 11-05-2009, 07:45 AM

what if i try the idle control valve?

bradrhale · 11-05-2009, 11:20 AM

i guess it runs great at about 1000RPMS while sitting in the yard?? if it seems to sputter and stall out without giving it any gas, you shuold check out the IAC. you may try removing it and cleaning it out before buying a new one though. should be 2 torx screws located on the back of the throttle body. it will have a brass colored, or in your case, black, that acts as a piston of sorts. do not screw it in but clean it up as well as the port in which the IAC feeds into. while there, go ahead and clean the butterfly in the TB. pay close attention to the back side of the throttle plate.

11-04-2009, 10:25 PM	#1
92chevyguy Junior Member Join Date: Nov 2009 Posts: 3	92 wont start I have a 92 chevy with tbi 350. It was running fine today and then it started bogging down like it wasnt getting fuel. So i replaced the fuel filter on the frame. Problem still existed. checked the injectors and they seem ok. changed the fuel pump and yet again the problem still is there..... Any ideas on what else it could be....

11-04-2009, 10:44 PM	#2
BernieB Senior Member Join Date: Jul 2009 Location: Fredericksburg, VA Posts: 1,902	Start looking at your "combustion triad" (air/fuel, compression, ignition) and see where it leads you. In your case, we'll assume you have compression, so that leaves the air/fuel mixture and ignition left to check. You've already checked half of the air/fuel leg of the triad, so maybe you'll want to look at the "air" portion of that. How's the airflow? Clean filter? Nothing blocking the intake? __________________ If the guys who design 'em had to take one home, use it every day for 2 years, and do all the maint and repairs themselves, cars would have a button on the dash to change the oil, filters & plugs.

11-05-2009, 01:16 AM	#3
shadygrady Senior Member Join Date: Feb 2007 Location: Brandon,MS Posts: 94	I could be wrong but this is my experience.Ive found most of the time with my vehicles ignition components wear out the fastest and most often.Ive never had to change a fuel pump and never had anything block or clog the intake track.I am however about to change the fuel pump on my iroc.180,000 miles and its still going,i just need to upgrade to a 255 L/hr.My friends stock pump lasted 200,000 miles. If its a well maintained truck i.e. clean air filter,maintained fuel system its prolly a bad set of plugs,wires,cap,rotor or maybe an ignition module or coil.Ive had all of these fail on me.However when the coil or the module fail you should get a no crank situation.Good luck Oh i just remembered and noticed your thred title was NO START.Do you have spark? __________________ 1989 k1500 Cheyene 4x4,regular cab,swb,4.3 V-6.11`x 4`k&N Open element,TBI mods,smog pump delete,mechanical fan clutch to electric fan swap.flowmaster 2.5 dual exhaust.

11-05-2009, 05:29 AM	#5
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,300	is it no start or running bad, might have pinched a fuel line putting the pump in, so you are chasing the original solution __________________ 4 wheels move the body 2 wheels move the soul B.W.A.I

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11-05-2009, 03:03 AM	#4
gmctrucks Senior Member Join Date: Nov 2006 Location: Houston,Texas Posts: 4,033	Welcome to the forum and howdy from TEXAS. What brand fuel pump did you buy? Check your fuel pressure. Now im not saying that im right but it's a idea. Shady don't forget to buy a Delphi pump look how long the OEM has lasted. Good luck! GMC

11-05-2009, 07:37 AM	#6
92chevyguy Junior Member Join Date: Nov 2009 Posts: 3	it stays running if you give it gas. but if you try to give it more gas it dies like its not getting enough fuel orr something

11-05-2009, 07:45 AM	#8
92chevyguy Junior Member Join Date: Nov 2009 Posts: 3	what if i try the idle control valve?

11-05-2009, 11:20 AM	#9
bradrhale Senior Moderator Join Date: Apr 2006 Location: Texas Posts: 8,025	i guess it runs great at about 1000RPMS while sitting in the yard?? if it seems to sputter and stall out without giving it any gas, you shuold check out the IAC. you may try removing it and cleaning it out before buying a new one though. should be 2 torx screws located on the back of the throttle body. it will have a brass colored, or in your case, black, that acts as a piston of sorts. do not screw it in but clean it up as well as the port in which the IAC feeds into. while there, go ahead and clean the butterfly in the TB. pay close attention to the back side of the throttle plate.

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