TBI flooded and 400 rebuild ?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**BOSS** · 08-16-2003, 10:22 PM

Ok guys i need some help here.First off i am working on my brother-in-laws 89 k10,and the tbi is flooding it bad.help me go through what i need to please.....lol......Second ? i have a 400 sbc i am wanting to rebuild to put into a 72 4x4 lwb and i am wanting to tow with it so i am after your advice as to what would be best.
I have always trusted your info and i need it again......THANX

frost89434 · 08-16-2003, 11:53 PM

As for the tbi check to make sure that the injector is seated good in the housing. It could also be the seal around the injector. When I rebuilt my tbi i didn't have it seated properly and it flooded really bad. JIM

**BOSS** · 08-17-2003, 12:37 AM

thanx i will have to look at that tomorrow

**BOSS** · 08-17-2003, 08:18 AM

TTT come on guys i have to work this morning but am wanting to work on the truck this afternoon so i am bringing this back to the top for some more things i should try.I really need to try to get this truck back on the road and would like to get started on the 400sbc too...Thanx

Locutus · 08-17-2003, 12:02 PM

You also need to make sure your injectors are functioning properly. If one is staying open it could cause it to flood.

charlieo · 08-17-2003, 12:06 PM

I built mine about a year ago W/ the following :
Block zero decked , bored and honed (of cource)
new vortec heads , hypereutetic pistons on 5.7 " rods,comp cam kit. this motor runs really well !

Chevy Wrench · 08-17-2003, 01:48 PM

As far as the TBI flooding, here we go... Ok, lets see why its squirting too much gas. The reasons could be many, however, the pcm sets flow rate. Are both injectors flooding? Unplug one and check it. The O2 sensor sends a signal to the pcm to tell the injectors to richen or lean out. Also the TPS (throttle position sensor) tells the injectors exactly how much fuel to spray. Have you scanned the pcm for any codes? That would be the first thing I would do. Second, I would test the tps with the scanner still connected so you can see the percentage values. Third, I would do an ohm's test on the o2s. And then if everything tests fine, I would check the fuel pressure, and make sure its not pumping too much. If it is ok, then I would start to tear apart the tbi and have the injectors flow tested. After that, there isnt much left that could go wrong. Good luck, if you have any questions, feel free to ask.
John

Tx Firefighter · 08-17-2003, 01:55 PM

If coolant temp sensor fails, it will read -40 degrees. The computer will richen the crap out of it. Kind of like a choke on a carb. Check this with a scanner to see what temp the sensor is reading. It should be ambient temp on an unstarted engine, or 180-200 degrees on a warm one.

Chevy Wrench · 08-17-2003, 02:30 PM

I seem to always overlook one peice of the puzzle...

**BOSS** · 08-17-2003, 04:12 PM

wanted to let you guys know that it is flooding too bad to even get it running.How can i get codes without it running?And remember i am doing this the redneck way.......no scanners,code readers,nothing that would probably help me.......lol
Thanx guys for all of your help i am going to go try some more stuff and i will check back soon
btw it is getting hot out there.......lol

**BOSS** · 08-17-2003, 06:26 PM

i tried to change the computer and still nothing.It still sprays REALLY fast out of the injectors.If i let it sit for awhile it will hit just a little then it floods it again.Cant get it to start.Keep the sugestions comeing ok..Thanx

73stepside · 08-17-2003, 07:35 PM

check the fuel pressure regulator too. to pull codes, you can jumper pins on the aldl which should be at the bottom of the driver side dash. it looks like a big electrical plug. you should jumper the last 2 pins on the plug. they will be on the passenger side of the plug. if those don't work, them move the top pin over to the left one and it should work. do not start the truck when doing this or you could fry the computer. the service engine soon light will start to flash. if the light flashes 2 times quickly pauses then flashes 3 times quickly then stops and flashes the same code again, then you have a codes 23. that's just an example. you will have to get the codes from a chilton's or a code reader book.

*Piston* · 08-17-2003, 07:42 PM

Does it spray fuel when you turn the key on? I've seen a few of these ground the injector wire causing it to stay open all the time. The wire loom is pulled pretty tight on the right rear corner and will ground out on the lift bracket.

For the codes you'll want to jumper terminals A and B. This will be a white/black wire and a black/white wire. Jumper them and turn the key on. start watching the flashes.

Post your codes in here and I'll post the information on them.

**BOSS** · 08-17-2003, 10:23 PM

Guess i'll have to wait to get a book on it,cant tell if it sprays as soon as the key is on it is just me working on it.....lol.I really want to thank everyone for the help today.I might not have it fixed but i have been able to work on it at least....lol.Thanx guys

08-16-2003, 10:22 PM	#1
BOSS Just here to help Join Date: Jan 2002 Location: Norwood,Mo Posts: 3,893	TBI flooded and 400 rebuild ?? Ok guys i need some help here.First off i am working on my brother-in-laws 89 k10,and the tbi is flooding it bad.help me go through what i need to please.....lol......Second ? i have a 400 sbc i am wanting to rebuild to put into a 72 4x4 lwb and i am wanting to tow with it so i am after your advice as to what would be best. I have always trusted your info and i need it again......THANX __________________ Support our site Norwood Survivor

08-16-2003, 11:53 PM	#2
frost89434 Registered User Join Date: Nov 2001 Location: sparks, NV Posts: 1,141	As for the tbi check to make sure that the injector is seated good in the housing. It could also be the seal around the injector. When I rebuilt my tbi i didn't have it seated properly and it flooded really bad. JIM __________________ 68 short fleet with 71 front clip 2wd jaguar blue 99 chevy ext cab shrtbed z71 loaded 99 chevy swb fleetside(daily driver) Sparks, Nevada

08-17-2003, 12:37 AM	#3
BOSS Just here to help Join Date: Jan 2002 Location: Norwood,Mo Posts: 3,893	thanx i will have to look at that tomorrow __________________ Support our site Norwood Survivor

08-17-2003, 08:18 AM	#4
BOSS Just here to help Join Date: Jan 2002 Location: Norwood,Mo Posts: 3,893	TTT come on guys i have to work this morning but am wanting to work on the truck this afternoon so i am bringing this back to the top for some more things i should try.I really need to try to get this truck back on the road and would like to get started on the 400sbc too...Thanx __________________ Support our site Norwood Survivor

08-17-2003, 12:06 PM	#6
charlieo Registered User Join Date: Feb 2003 Location: sw Posts: 341	my 400 I built mine about a year ago W/ the following : Block zero decked , bored and honed (of cource) new vortec heads , hypereutetic pistons on 5.7 " rods,comp cam kit. this motor runs really well !

08-17-2003, 12:02 PM	#5
Locutus Registered User Join Date: Jan 2003 Location: Santa Fe, Texas Posts: 250	You also need to make sure your injectors are functioning properly. If one is staying open it could cause it to flood.

08-17-2003, 01:48 PM	#7
Chevy Wrench former desert rat Join Date: Feb 2003 Location: salt lake city, utah Home of the 3 M's Mormons, methlabs and minivans Posts: 320	As far as the TBI flooding, here we go... Ok, lets see why its squirting too much gas. The reasons could be many, however, the pcm sets flow rate. Are both injectors flooding? Unplug one and check it. The O2 sensor sends a signal to the pcm to tell the injectors to richen or lean out. Also the TPS (throttle position sensor) tells the injectors exactly how much fuel to spray. Have you scanned the pcm for any codes? That would be the first thing I would do. Second, I would test the tps with the scanner still connected so you can see the percentage values. Third, I would do an ohm's test on the o2s. And then if everything tests fine, I would check the fuel pressure, and make sure its not pumping too much. If it is ok, then I would start to tear apart the tbi and have the injectors flow tested. After that, there isnt much left that could go wrong. Good luck, if you have any questions, feel free to ask. John __________________ 94 Chevy Silverado Ext cab 4/6 drop w/ 18's and 2500watt system (work truck). 67 Chevy swb under const. frame off custom, 20's, bagged and a large rat under the hood,and a 1940 Chevy truck under const.

08-17-2003, 01:55 PM	#8
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	If coolant temp sensor fails, it will read -40 degrees. The computer will richen the crap out of it. Kind of like a choke on a carb. Check this with a scanner to see what temp the sensor is reading. It should be ambient temp on an unstarted engine, or 180-200 degrees on a warm one. __________________ I'm on the Instagram- @Gearhead_Kevin

08-17-2003, 02:30 PM	#9
Chevy Wrench former desert rat Join Date: Feb 2003 Location: salt lake city, utah Home of the 3 M's Mormons, methlabs and minivans Posts: 320	I seem to always overlook one peice of the puzzle... __________________ 94 Chevy Silverado Ext cab 4/6 drop w/ 18's and 2500watt system (work truck). 67 Chevy swb under const. frame off custom, 20's, bagged and a large rat under the hood,and a 1940 Chevy truck under const.

08-17-2003, 04:12 PM	#10
BOSS Just here to help Join Date: Jan 2002 Location: Norwood,Mo Posts: 3,893	wanted to let you guys know that it is flooding too bad to even get it running.How can i get codes without it running?And remember i am doing this the redneck way.......no scanners,code readers,nothing that would probably help me.......lol Thanx guys for all of your help i am going to go try some more stuff and i will check back soon btw it is getting hot out there.......lol __________________ Support our site Norwood Survivor

08-17-2003, 06:26 PM	#11
BOSS Just here to help Join Date: Jan 2002 Location: Norwood,Mo Posts: 3,893	again i tried to change the computer and still nothing.It still sprays REALLY fast out of the injectors.If i let it sit for awhile it will hit just a little then it floods it again.Cant get it to start.Keep the sugestions comeing ok..Thanx __________________ Support our site Norwood Survivor

08-17-2003, 07:35 PM	#12
73stepside Registered User Join Date: Feb 2002 Location: Moore OK 73160 Posts: 974	check the fuel pressure regulator too. to pull codes, you can jumper pins on the aldl which should be at the bottom of the driver side dash. it looks like a big electrical plug. you should jumper the last 2 pins on the plug. they will be on the passenger side of the plug. if those don't work, them move the top pin over to the left one and it should work. do not start the truck when doing this or you could fry the computer. the service engine soon light will start to flash. if the light flashes 2 times quickly pauses then flashes 3 times quickly then stops and flashes the same code again, then you have a codes 23. that's just an example. you will have to get the codes from a chilton's or a code reader book. __________________ 04 GMC Sierra RCSS 70 CST LWB 04 HD Sportster 1200 Custom

08-17-2003, 07:42 PM	#13
Piston Account Suspended Join Date: Oct 2002 Location: Olathe, KS Posts: 2,301	Does it spray fuel when you turn the key on? I've seen a few of these ground the injector wire causing it to stay open all the time. The wire loom is pulled pretty tight on the right rear corner and will ground out on the lift bracket. For the codes you'll want to jumper terminals A and B. This will be a white/black wire and a black/white wire. Jumper them and turn the key on. start watching the flashes. Post your codes in here and I'll post the information on them. Last edited by Piston; 08-17-2003 at 07:55 PM.

08-17-2003, 10:23 PM	#14
BOSS Just here to help Join Date: Jan 2002 Location: Norwood,Mo Posts: 3,893	Guess i'll have to wait to get a book on it,cant tell if it sprays as soon as the key is on it is just me working on it.....lol.I really want to thank everyone for the help today.I might not have it fixed but i have been able to work on it at least....lol.Thanx guys __________________ Support our site Norwood Survivor



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