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#301 |
Registered User
Join Date: Nov 2011
Location: West Plains Missouri
Posts: 2,088
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Re: Mike's 50
Looking really good Mike
Mark
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#302 |
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Join Date: Feb 2014
Location: Sunnyvale, CA
Posts: 605
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Re: Mike's 50
Thanks Mark
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#303 |
Registered User
Join Date: Feb 2014
Location: Sunnyvale, CA
Posts: 605
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Re: Mike's 50
Well got the truck back from the exhaust shop today.
Drove it from exhaust shop to my shop about 3 miles. Runs like S**t, loading up. not sure what is going on, may be fuel pressure or vacuum leak, not sure will hook up scanner and see if I can find out problem, should idle nice and smooth, but it aint. It sure was fun driving it though, never made it over about 30mph. Here is a link to You Tube videos. videos taken by my girlfriend Will post a picture of exhaust in the next few days. https://youtu.be/6HPX2ZoeoUs https://youtu.be/s-P_ngiQZXI
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#304 |
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Location: Alabama
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Re: Mike's 50
Nice to see it running..you'll figure it out...trucks lookin good
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#305 |
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Location: West Side of the valley, CA
Posts: 878
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Re: Mike's 50
does look good under its own power.
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#306 |
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Join Date: Dec 2002
Location: Cactus Patch So. Az
Posts: 4,749
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Re: Mike's 50
Vacuum leak, MAF, O2, exhaust leak before O2, flange gasket, missing ground connection
Keep us updated on the problem solving, I am about a week out from starting my new LS3 and following your updates
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53 TuTone Extended Cab 350 4-Spd 3:08 (SOLD) 53 Chevy Moldy pearl green ZZ-4 4L60E 9" 3:25 55 GMC 1st Black Mll (ZZ4) ZZ6 TKO 600 5 sp 3:73 62 Solidaxle Corvette Roman Red (327 340hp 4spd 3:36) C4 & C5 suspension tube chassis LS 3 4L70E 65 Corvette Coupe 327 350hp 4spd 4:11 78 Black Silverado SWB (350/350) 5.3 & 4L60E 3:42 2000 S-Type 3.0 (wife cruiser) 2003 GMC SCSB 5.3 4L60E 3:42 |
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#307 |
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Join Date: Mar 2015
Location: Morada, CA --- (Near Lodi)
Posts: 1,443
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Re: Mike's 50
Looks great!!!! nice to have on the road!
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#308 |
Registered User
Join Date: Feb 2014
Location: Sunnyvale, CA
Posts: 605
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Re: Mike's 50
finished exhaust. may coat it or VHT high temp paint.
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#309 | |
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Join Date: Jan 2017
Location: Hillsboro, Ks
Posts: 25
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Re: Mike's 50
Quote:
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#310 |
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Join Date: Feb 2014
Location: Sunnyvale, CA
Posts: 605
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Re: Mike's 50
I'll take a picture tomorrow morning and post it.
Hooked scan tool up this morning and O2 voltages on both banks KOEO is 415mv and KOER O2 voltage is down to 10mv. Running really rich and fuel pressure is up close to 80psi. I'm just ordered a Holley filter regulator assembly to try and bring pressures down. I tried to keep the MAF away from the throttle and it is in a straight pipe section.
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#311 | |
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Join Date: Dec 2002
Location: Cactus Patch So. Az
Posts: 4,749
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Re: Mike's 50
Quote:
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53 TuTone Extended Cab 350 4-Spd 3:08 (SOLD) 53 Chevy Moldy pearl green ZZ-4 4L60E 9" 3:25 55 GMC 1st Black Mll (ZZ4) ZZ6 TKO 600 5 sp 3:73 62 Solidaxle Corvette Roman Red (327 340hp 4spd 3:36) C4 & C5 suspension tube chassis LS 3 4L70E 65 Corvette Coupe 327 350hp 4spd 4:11 78 Black Silverado SWB (350/350) 5.3 & 4L60E 3:42 2000 S-Type 3.0 (wife cruiser) 2003 GMC SCSB 5.3 4L60E 3:42 |
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#312 |
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Join Date: Feb 2014
Location: Sunnyvale, CA
Posts: 605
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Re: Mike's 50
here is the intake system
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#313 |
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Join Date: Feb 2014
Location: Sunnyvale, CA
Posts: 605
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Re: Mike's 50
Solidaxel,
I dont recall, what fuel pump system are you running with you LS3?
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#314 |
Registered User
Join Date: Dec 2002
Location: Cactus Patch So. Az
Posts: 4,749
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Re: Mike's 50
I am using a Camaro/Firebird in tank and a Wix filter
My instructions that came with the crate said to be 12 to 14" from the throttle, and it looks like you have that How is the idle, does it "smell" "OK"
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53 TuTone Extended Cab 350 4-Spd 3:08 (SOLD) 53 Chevy Moldy pearl green ZZ-4 4L60E 9" 3:25 55 GMC 1st Black Mll (ZZ4) ZZ6 TKO 600 5 sp 3:73 62 Solidaxle Corvette Roman Red (327 340hp 4spd 3:36) C4 & C5 suspension tube chassis LS 3 4L70E 65 Corvette Coupe 327 350hp 4spd 4:11 78 Black Silverado SWB (350/350) 5.3 & 4L60E 3:42 2000 S-Type 3.0 (wife cruiser) 2003 GMC SCSB 5.3 4L60E 3:42 |
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#315 |
Registered User
Join Date: Feb 2014
Location: Sunnyvale, CA
Posts: 605
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Re: Mike's 50
It smells really rich. not chugging black smoke but ricchhh.
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#316 |
Registered User
Join Date: Jan 2017
Location: Hillsboro, Ks
Posts: 25
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Re: Mike's 50
The high fuel pressure could be a lot of it. The spec is about 60psi. solidaxel is right about what GM says in the instructions. I talked with GM tech support and their recommendation is to have at least 10 to 12 inches of straight pipe after the MAF sensor and the sensor needs to be installed in the top of the pipe. I would recommend moving your sensor closer to the air filter.
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#317 |
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Location: Alabama
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Re: Mike's 50
80 psi does sound extremely high...
On my ls3 I'm going to run a areomotive 340 on it...I was told that would work fine.. On my lq9 my maf is right at the throttle and it causes no issues..my dyno man said it was fine.. on my ls3 I've got all the camaro breather system but I'm not sure how far away it is but I don't think its 12"...would have to measure to be sure though |
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#318 | |
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Join Date: Jan 2017
Location: Hillsboro, Ks
Posts: 25
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Re: Mike's 50
Quote:
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#319 |
Senior Member
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Location: Doodah Kansas
Posts: 7,773
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Re: Mike's 50
the LS3 fuel rail is returnless, depending on what you have used for a fuel pump and filter it sounds like maybe you are just hitting full pressure of the pump (80 psi) instead of what the returnless regulator at the filter sets it (60 psi).
I didnt read back through for what you used for a fuel pump and filter but thats just an observation.
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#320 |
Post Whore
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Location: Alabama
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Re: Mike's 50
I had to look up what connect and cruise was....so no ...i guess I didn't use that..mines a junkyard lq9 with psi harness and stock ecm
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#321 |
Post Whore
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Location: Alabama
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Re: Mike's 50
Mike I saw in post 64 the pic of your filter mounted on the rail....did you double check to make sure your pressure and return hoses are in the right place?...you may know already but pressure goes on the outside and return is in the middle..just asking..
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#322 |
Registered User
Join Date: Dec 2002
Location: Cactus Patch So. Az
Posts: 4,749
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Re: Mike's 50
Did I read on here somewhere where someone had the in and our (return) transposed on the fuel filter?
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53 TuTone Extended Cab 350 4-Spd 3:08 (SOLD) 53 Chevy Moldy pearl green ZZ-4 4L60E 9" 3:25 55 GMC 1st Black Mll (ZZ4) ZZ6 TKO 600 5 sp 3:73 62 Solidaxle Corvette Roman Red (327 340hp 4spd 3:36) C4 & C5 suspension tube chassis LS 3 4L70E 65 Corvette Coupe 327 350hp 4spd 4:11 78 Black Silverado SWB (350/350) 5.3 & 4L60E 3:42 2000 S-Type 3.0 (wife cruiser) 2003 GMC SCSB 5.3 4L60E 3:42 |
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#323 |
Post Whore
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Location: Alabama
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Re: Mike's 50
Yep... that's happened a couple times on here recently....
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#324 |
Registered User
Join Date: Dec 2002
Location: Cactus Patch So. Az
Posts: 4,749
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Re: Mike's 50
,,,,,,,,,,,,, or maybe it was a restriction in the return line at the tank that made the fuel pressure so high
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53 TuTone Extended Cab 350 4-Spd 3:08 (SOLD) 53 Chevy Moldy pearl green ZZ-4 4L60E 9" 3:25 55 GMC 1st Black Mll (ZZ4) ZZ6 TKO 600 5 sp 3:73 62 Solidaxle Corvette Roman Red (327 340hp 4spd 3:36) C4 & C5 suspension tube chassis LS 3 4L70E 65 Corvette Coupe 327 350hp 4spd 4:11 78 Black Silverado SWB (350/350) 5.3 & 4L60E 3:42 2000 S-Type 3.0 (wife cruiser) 2003 GMC SCSB 5.3 4L60E 3:42 |
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#325 |
Registered User
Join Date: Feb 2014
Location: Sunnyvale, CA
Posts: 605
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Re: Mike's 50
Guys,
Thank you all for the suggestions. Mongocanfly, I did double check that I have the feed to the outside connection and return on the center connection. Joedoh, I'm running a Aeromotive 340 Stealth in tank system, to the corvette filter than off to the fuel rails which have been set up returnless, they are Holley fuel rails but that shouldnt matter. My thinking is the pressure and volume is overwhelming the filter/regulator., I was also thinking that maybe the return being only -6 might be restricting the return flow. I will update as soon as I having this thing purring like it should be. Solidaxel, I have not checked the return line from the filter to the tank yet. Its on my list to check when I get some time to look further into it.
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