TBI 5.7 Woes - The 1947 - Present Chevrolet & GMC Truck Message Board Network

*JCampbell* · 06-19-2013, 03:10 PM

Having issues with the TBI 5.7 in my Suburban. Had a part-throttle ping, replaced the EGR solenoid and double checked that base timing was at 0°. Ping went away for about 100 miles or so (or maybe I just didn’t notice it), then came back. Thought it could have been poor gas, so I filled up with ½ tank of 91 octane instead of 87 to see if it would cure it. It did...I think. Tank ran out, went back to 87 octane, ping came back. Ran that tank out, filled back up with 91. No issues except yesterday at a stop light, the truck was idling, then stumbled slightly. It recovered quickly, but was sort of odd and seemed to come out of nowhere.

I jumped in today to head off to work, SES light came on. Truck seemed “sluggish” (could have just been in my head - the thing is on 35’s with 3.73s so it’s not exactly a powerhouse anyway). Stopped for coffee, shut truck off. Came out, started truck back up, SES light was off. Drove another mile (or so) SES light came back on.

Haven’t pulled a code or anything yet. Just wondering if anyone has any ideas?

Jonboy · 06-19-2013, 04:50 PM

Sounds like it could be the ESC module. If it isn't pulling/giving timing correctly, it would cause the truck to run like doo doo. If you were able to pull a code, that would give you somewhere to look. Was the EGR clean?

*JCampbell* · 06-19-2013, 07:45 PM

I'll pull the code(s) tonight. EGR looked good and passed the vacuum test.

*JCampbell* · 07-10-2013, 01:40 PM

Weird. Just went out to pull the codes and got nothing. Just kept flashing "12" over and over.

manimal · 07-10-2013, 01:44 PM

That's kinda weird...mine would store the EGR code,but the light didnt always come on.

*JCampbell* · 07-10-2013, 01:47 PM

Oh well, I'm gonna try to go get it smogged. I'll just keep an eye on it.

manimal · 07-10-2013, 01:48 PM

cant you get it registered in WA? Do they do smog tests there?

Rich84 · 07-10-2013, 02:12 PM

I chased a slight ping on part throttle accelerations for a while..Screwed around with fuel pressure, timing, colder plugs..Etc. I found that if I use at least 89 octane it never pings , ever.

*JCampbell* · 07-10-2013, 04:24 PM

Quote:

Originally Posted by manimal

cant you get it registered in WA? Do they do smog tests there?

Yeah, my Pops is registering my Shortbed and my Dually up there under his name, and I'll do a title transfer once we get up there.

Desert1957 · 07-11-2013, 01:06 AM

12 code is normal, If there were any codes it would start with 12 , flash any other codes , end with 12 code

*JCampbell* · 07-11-2013, 01:11 AM

Right.

LynnJr · 07-11-2013, 01:20 AM

I would run a large cup of water through it.Get it running and up to temperature then bring up the rpm to 3500 and slowly trickle the water into the TBI.
It will remove any carbon hotpots on the pistons and flush the egr passages.It is poor mans seas foam.

06-19-2013, 03:10 PM	#1
JCampbell Account Suspended Join Date: Apr 2008 Location: Hesperia, Ca Posts: 1,332	TBI 5.7 Woes Having issues with the TBI 5.7 in my Suburban. Had a part-throttle ping, replaced the EGR solenoid and double checked that base timing was at 0°. Ping went away for about 100 miles or so (or maybe I just didn’t notice it), then came back. Thought it could have been poor gas, so I filled up with ½ tank of 91 octane instead of 87 to see if it would cure it. It did...I think. Tank ran out, went back to 87 octane, ping came back. Ran that tank out, filled back up with 91. No issues except yesterday at a stop light, the truck was idling, then stumbled slightly. It recovered quickly, but was sort of odd and seemed to come out of nowhere. I jumped in today to head off to work, SES light came on. Truck seemed “sluggish” (could have just been in my head - the thing is on 35’s with 3.73s so it’s not exactly a powerhouse anyway). Stopped for coffee, shut truck off. Came out, started truck back up, SES light was off. Drove another mile (or so) SES light came back on. Haven’t pulled a code or anything yet. Just wondering if anyone has any ideas?

06-19-2013, 04:50 PM	#2
Jonboy Slots go on anything! Join Date: May 2003 Location: Richardson, TX Posts: 5,957	Re: TBI 5.7 Woes Sounds like it could be the ESC module. If it isn't pulling/giving timing correctly, it would cause the truck to run like doo doo. If you were able to pull a code, that would give you somewhere to look. Was the EGR clean?

06-19-2013, 07:45 PM	#3
JCampbell Account Suspended Join Date: Apr 2008 Location: Hesperia, Ca Posts: 1,332	Re: TBI 5.7 Woes I'll pull the code(s) tonight. EGR looked good and passed the vacuum test.

07-10-2013, 01:40 PM	#4
JCampbell Account Suspended Join Date: Apr 2008 Location: Hesperia, Ca Posts: 1,332	Re: TBI 5.7 Woes Weird. Just went out to pull the codes and got nothing. Just kept flashing "12" over and over.

07-10-2013, 01:44 PM	#5
manimal Registered User Join Date: Oct 2006 Location: Southern Kalifornia Posts: 3,066	Re: TBI 5.7 Woes That's kinda weird...mine would store the EGR code,but the light didnt always come on. __________________ ------------------------------------------------------ -Lance 2000 Chevy C2500, 5.7, 4L80e 1999 Suburban K2500, 7.4, 4L80e 1980 Camaro..son's car...PROJECT

07-10-2013, 01:47 PM	#6
JCampbell Account Suspended Join Date: Apr 2008 Location: Hesperia, Ca Posts: 1,332	Re: TBI 5.7 Woes Oh well, I'm gonna try to go get it smogged. I'll just keep an eye on it.

07-10-2013, 01:48 PM	#7
manimal Registered User Join Date: Oct 2006 Location: Southern Kalifornia Posts: 3,066	Re: TBI 5.7 Woes cant you get it registered in WA? Do they do smog tests there? __________________ ------------------------------------------------------ -Lance 2000 Chevy C2500, 5.7, 4L80e 1999 Suburban K2500, 7.4, 4L80e 1980 Camaro..son's car...PROJECT

07-10-2013, 02:12 PM	#8
Rich84 Registered User Join Date: Mar 2012 Location: Woodbury, Ct. Posts: 1,692	Re: TBI 5.7 Woes I chased a slight ping on part throttle accelerations for a while..Screwed around with fuel pressure, timing, colder plugs..Etc. I found that if I use at least 89 octane it never pings , ever.

07-11-2013, 01:06 AM	#10
Desert1957 Registered User Join Date: Apr 2009 Location: New Freedom Pa. Posts: 1,335	Re: TBI 5.7 Woes 12 code is normal, If there were any codes it would start with 12 , flash any other codes , end with 12 code

07-11-2013, 01:11 AM	#11
JCampbell Account Suspended Join Date: Apr 2008 Location: Hesperia, Ca Posts: 1,332	Re: TBI 5.7 Woes Right.

07-11-2013, 01:20 AM	#12
LynnJr Registered User Join Date: Nov 2012 Location: santa rosa,california Posts: 650	Re: TBI 5.7 Woes I would run a large cup of water through it.Get it running and up to temperature then bring up the rpm to 3500 and slowly trickle the water into the TBI. It will remove any carbon hotpots on the pistons and flush the egr passages.It is poor mans seas foam.



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