wire problems - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bark · 08-21-2011, 07:23 PM

ok, Ive built my harness using info from lt1 swap, I'm in mock up stage on my dbw 6.0l in a 76 stepper, I hooked it all up my pump ran for a second and my throttle body did a search phase, then has a kinda hum whistle sound to it, but does not open or close with throttle, also when I hook up my scanner It powers up but will not connect to the computer. I have not got my computer tune done yet, so not sure if that is why its not working, was just kinda hoping to fire it (not run, just fire. I know vats won't allow it), before I tear it all down for paint????

did I do something wrong, or will I have to wait for a tune before I bother trying?

thanks

68GMCCustom · 08-26-2011, 12:05 PM

I'm not certain of this....but didn't think the DBW throttle bodies took input from the pedal until the engine starts? As far as the sound....don't have a clue. scanner shouldn't require a tune to activate?

usmcchevy · 08-26-2011, 04:13 PM

Everything sounds right. You can try to start it with VATS but it will pop a few times and die or maybe run for a few seconds.

BR3W CITY · 08-27-2011, 02:47 PM

if vats is in it will turn over but will usually die before it catches. IF your fuel system is primed it will catch and fire a few *chugs* but die again. If your engine is non-stock, the pcm needs to "learn" the setup a bit so it probably won't catch.
I think 68GMC is right, the tb won't respond until its running, except for the test "Sweep" from key on.

bark · 09-14-2011, 01:47 PM

been really busy around here, so havent had much time to work on it. I checked my daily driver (03 silverado) and with the key on if you step on the go pedal the TB will open, so? I will have to go throught my wireing, I`m hopeing it might just have a ground problem

bark · 10-02-2011, 10:48 AM

so I got some time, I did some digging on my harness, and found that I missed a ground on the back of the engine (there is more then one), as soon as I hooked it up, hit the key the pump primed up. I cranked and it fired and died, then all of a sudden my scanner decided to link to the computer???? and I had an intake pressure code and bad MAF, grabbed another MAF erased codes, hit the key and it RUNS!!!!!!! found out that workhorse delivery vans don't have VATS

Now the only issue is my intake pressure code keeps coming back, which disables my DBW TB, as soon as I erase it, the throttle will operate for a bit????

have to find out more about intake pressure code, but it runs, so now its time for tear down and PAINT.... YAY!!!!!!

clinebarger · 10-02-2011, 06:19 PM

Quote:

Originally Posted by bark

so I got some time, I did some digging on my harness, and found that I missed a ground on the back of the engine (there is more then one), as soon as I hooked it up, hit the key the pump primed up. I cranked and it fired and died, then all of a sudden my scanner decided to link to the computer???? and I had an intake pressure code and bad MAF, grabbed another MAF erased codes, hit the key and it RUNS!!!!!!! found out that workhorse delivery vans don't have VATS

Now the only issue is my intake pressure code keeps coming back, which disables my DBW TB, as soon as I erase it, the throttle will operate for a bit????

have to find out more about intake pressure code, but it runs, so now its time for tear down and PAINT.... YAY!!!!!!

Whats the code number?

bark · 10-02-2011, 08:26 PM

hmm I think it was p0107???

not sure tho will have to re scan it, cause I guaranty it will be back.

clinebarger · 10-05-2011, 10:41 AM

Quote:

Originally Posted by bark

hmm I think it was p0107???

not sure tho will have to re scan it, cause I guaranty it will be back.

P0107...MAP Sensor Circuit Low Voltage.

Possible Causes.
MAP sensor connector is damaged (check pins for damage, and for moisture)
MAP sensor signal circuit is shorted to ground
MAP sensor 5 volt circuit open between the sensor and PCM
MAP sensor has failed
PCM has failed

Check the MAP sensor voltage, Key On Engine Off.
Should have close to 5 V when near sea level.
Check the MAP sensor connection at the rear of the intake manifold.

mcbassin · 10-08-2011, 12:45 AM

since your engine PCM doesn't have VATS does this mean you didn't have to have it re-programmed? You know what vehicle your donor came from?

bark · 10-09-2011, 11:02 PM

Ya it's from a cube van, a 2005 workhorse still need to get a burn, cause I got rid of the emissions
Posted via Mobile Device

08-21-2011, 07:23 PM	#1
bark Registered User Join Date: Jun 2010 Location: Manitoba Posts: 223	wire problems ok, Ive built my harness using info from lt1 swap, I'm in mock up stage on my dbw 6.0l in a 76 stepper, I hooked it all up my pump ran for a second and my throttle body did a search phase, then has a kinda hum whistle sound to it, but does not open or close with throttle, also when I hook up my scanner It powers up but will not connect to the computer. I have not got my computer tune done yet, so not sure if that is why its not working, was just kinda hoping to fire it (not run, just fire. I know vats won't allow it), before I tear it all down for paint???? did I do something wrong, or will I have to wait for a tune before I bother trying? thanks

08-26-2011, 12:05 PM	#2
68GMCCustom Truck and auto performance nut Join Date: Feb 2007 Location: McKinney,Texas Posts: 3,848	Re: wire problems I'm not certain of this....but didn't think the DBW throttle bodies took input from the pedal until the engine starts? As far as the sound....don't have a clue. scanner shouldn't require a tune to activate? __________________ Kurt - '68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy '72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close '06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD '18 Kia Sorento - wife's econo-driver '95 Chevy S10 - reg cab shortbed, LS, 4.3, auto... my '68's powertrain and chassis build -links broken A surprise phase - carb to efi -links broken

08-26-2011, 04:13 PM	#3
usmcchevy Has more rust than truck... Join Date: Apr 2005 Location: Ivanhoe, MN Posts: 2,421	Re: wire problems Everything sounds right. You can try to start it with VATS but it will pop a few times and die or maybe run for a few seconds. __________________ 1972 Custom/10 SWB, 4.8/4l80e Build thread LSx Swap FAQ index

08-27-2011, 02:47 PM	#4
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: wire problems if vats is in it will turn over but will usually die before it catches. IF your fuel system is primed it will catch and fire a few chugs but die again. If your engine is non-stock, the pcm needs to "learn" the setup a bit so it probably won't catch. I think 68GMC is right, the tb won't respond until its running, except for the test "Sweep" from key on. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

09-14-2011, 01:47 PM	#5
bark Registered User Join Date: Jun 2010 Location: Manitoba Posts: 223	Re: wire problems been really busy around here, so havent had much time to work on it. I checked my daily driver (03 silverado) and with the key on if you step on the go pedal the TB will open, so? I will have to go throught my wireing, I`m hopeing it might just have a ground problem

10-02-2011, 10:48 AM	#6
bark Registered User Join Date: Jun 2010 Location: Manitoba Posts: 223	Re: wire problems so I got some time, I did some digging on my harness, and found that I missed a ground on the back of the engine (there is more then one), as soon as I hooked it up, hit the key the pump primed up. I cranked and it fired and died, then all of a sudden my scanner decided to link to the computer???? and I had an intake pressure code and bad MAF, grabbed another MAF erased codes, hit the key and it RUNS!!!!!!! found out that workhorse delivery vans don't have VATS Now the only issue is my intake pressure code keeps coming back, which disables my DBW TB, as soon as I erase it, the throttle will operate for a bit???? have to find out more about intake pressure code, but it runs, so now its time for tear down and PAINT.... YAY!!!!!!

10-02-2011, 08:26 PM	#8
bark Registered User Join Date: Jun 2010 Location: Manitoba Posts: 223	Re: wire problems hmm I think it was p0107??? not sure tho will have to re scan it, cause I guaranty it will be back.

10-08-2011, 12:45 AM	#10
mcbassin Still Learning Join Date: Jul 2009 Location: Central Oklahoma Posts: 10,108	Re: wire problems since your engine PCM doesn't have VATS does this mean you didn't have to have it re-programmed? You know what vehicle your donor came from? __________________ Mike "69 Short Wide" My Project 86 Silverado Landen's Project Instagram: @mcbassin My Website C/10 Club Oklahoma Facebook Group

10-09-2011, 11:02 PM	#11
bark Registered User Join Date: Jun 2010 Location: Manitoba Posts: 223	Re: wire problems Ya it's from a cube van, a 2005 workhorse still need to get a burn, cause I got rid of the emissions Posted via Mobile Device

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