06-28-2009, 09:01 PM | #1 |
Registered User
Join Date: Mar 2008
Location: phoenix az.
Posts: 53
|
time to junk the pos
i keep failing smog hi ho i find low vac and a leak at the manafold and cab replace all gaskets and vac only increases 1/2" any ideas befor i set this pos on fire
|
06-28-2009, 09:16 PM | #2 |
Registered User
Join Date: Mar 2008
Location: phoenix az.
Posts: 53
|
Re: time to junk the pos
i forgot to say 383 mild cam q jet headers
|
06-28-2009, 09:39 PM | #3 |
Registered User
Join Date: Jan 2009
Location: phoenix,AZ
Posts: 451
|
Re: time to junk the pos
one more question year of truck is?
make of truck is? model of truck is? once we these asners we can better help you |
06-28-2009, 10:47 PM | #4 |
Registered User
Join Date: Oct 2008
Location: Livermore ca
Posts: 699
|
Re: time to junk the pos
Did you surface the intake?
|
06-28-2009, 11:42 PM | #5 |
Registered User
Join Date: May 2005
Location: PA
Posts: 2,696
|
Re: time to junk the pos
what kind of vacuum readings are you getting at an idle?
timing? vacuum advance? Does the engine respond to the idle mixture screws? Where exactly is it failing, and what type of testing do they do? |
06-30-2009, 09:20 PM | #6 |
Registered User
Join Date: May 2009
Location: Mesa, AZ
Posts: 52
|
Re: time to junk the pos
Get insurance through Haggerty and you won't have to smog it anymore.
__________________
Matt 1970 C10 |
06-30-2009, 10:19 PM | #7 |
Registered User
Join Date: Mar 2008
Location: phoenix az.
Posts: 53
|
Re: time to junk the pos
the truck is a 70gmc 1/2 ton 383 stock heads mild cam q jet perfomer intake headers idle set at 800 idle screws set at 3 turns out timing set to 6btdc the intake was replaced with the gaskets changed the carb and no change even with the low vac can still get the idle down to 250im out of ideas so right now i am ready to get somthing pre 66
|
07-01-2009, 12:15 AM | #8 |
Registered User
Join Date: Oct 2008
Location: Livermore ca
Posts: 699
|
Re: time to junk the pos
Have you sprayed carb cleaner around it to see if you have a leak?
|
07-01-2009, 01:01 AM | #9 |
Registered User
Join Date: Jan 2009
Location: phoenix,AZ
Posts: 451
|
Re: time to junk the pos
jdfrmnt, if you junk ur 70 you might have the same issues with previous owner viruses.
|
07-01-2009, 01:28 AM | #10 |
Registered User
Join Date: Apr 2009
Location: Bend,Oregon
Posts: 225
|
Re: time to junk the pos
where are you geting your vacuume signal? if you are using a ported vacuume sorce, then you should have verry little to no vacuume on a guage. but if you have manifold vacuume and no vacuume,id say you got more going on. id check the idle screws, i only half to adjust mine out 1 1/2 turns out. id also look at the guage to see if it wiggles side to side indicating a valve problem. id also check for a plugged exhaust. if you can get the idle down to 250 still, id lean twards the exhaust, thinking maybe a muffler came apart or maybe someone stuffed somthing up the pipe. ... just my 2 cents ... hope you find it !
Last edited by tomtuna1978; 07-01-2009 at 01:29 AM. |
07-01-2009, 10:48 AM | #11 |
My Carbon Footprint
Join Date: Oct 2008
Location: Orygun
Posts: 5,527
|
Re: time to junk the pos
You can always do what I did and move to an area that doesn't have smog requirements.......but it might be easier to junk it!
|
07-01-2009, 10:52 AM | #12 | |
283 Drama Queen
Join Date: Dec 2004
Location: Surf City, CA
Posts: 2,435
|
Re: time to junk the pos
Quote:
Mac.
__________________
For about 12 years of my adult life I had a severe speech impediment. My ex-wife never let me get a word in edgewise. |
|
07-01-2009, 11:26 AM | #13 |
My Carbon Footprint
Join Date: Oct 2008
Location: Orygun
Posts: 5,527
|
Re: time to junk the pos
From what I understand is that they rate the vehicles as very limited use. I saw them on "my classic car" and they did ........ooops, I think I'm thinking about Grundy worldwide. I guess you could always do a comparison. It's grundy.com
|
07-02-2009, 06:39 AM | #14 | |
Registered User
Join Date: Apr 2009
Location: Truckville, The Capital of NY
Posts: 217
|
Re: time to junk the pos
Quote:
Anyway, back to the OP. Maybe i misunderstood some of your posts (it was hard to read without proper grammer/punctuation). What part of the tests specifically are you failing? You may have to retard the timing and lean the crap out of it to the point it runs horrible just to pass it. Mild cam doesnt really say a whole lot, but i will assume something in the 214/220 @.050 range for the duration---but remember, the more overlap it has, the more reversion of intake charge going out the exhaust at lower idle speeds.
__________________
. 454/4 speed, '85 Dodge Ram hybrid build in progress 454, PP heads, Dual 500 CFM cabs, 'Vette manifolds. First time out---spinning for half track Slooowww build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=348050 Engine build thread at: http://www.chevelles.com/forums/showthread.php?t=326289 |
|
07-02-2009, 10:46 PM | #15 |
Registered User
Join Date: Mar 2008
Location: phoenix az.
Posts: 53
|
Re: time to junk the pos
im failing ho at idle the rest is real low already retarded the timing and leaning it out no help just mad it worse so im lost
|
07-03-2009, 04:14 PM | #16 |
Senior Member
Join Date: Jan 2005
Location: Ontario, Kali
Posts: 2,427
|
Re: time to junk the pos
I hope you don't take this the wrong way, no insult intended.
I had the same problem and got so damn frustrated. I finally swallowed my pride and took the truck in to my dad's mechanic, he hooked it up to an analyzer and later that afternoon I picked the truck up, took it to the smog test center and it passed way easy. All levels were way below mandated levels. I'll do a tune for cruzin' around, but for smog testing I always take it in...
__________________
'69 Fleet It ain't yours, if you didn't build it! Last edited by Dano69c10; 07-03-2009 at 04:15 PM. |
07-06-2009, 10:40 AM | #17 | |
Registered User
Join Date: May 2005
Location: PA
Posts: 2,696
|
Re: time to junk the pos
Quote:
It is possible to lean it out so far that you get a lean miss, and send un-burnt fuel out the exhaust. |
|
07-07-2009, 01:24 AM | #18 |
Registered User
Join Date: Jan 2009
Location: phoenix,AZ
Posts: 451
|
Re: time to junk the pos
another little trick just to pas emissions is to pour a bottle of rubbing alcohol intho the tank before you go for testing
|
Bookmarks |
Thread Tools | |
Display Modes | |
|
|