LT1 help
Thread Starter
Burning Brakes
Joined: May 2005
Posts: 917
Likes: 55
From: Muskoka Ontario
LT1 help
I am chasing down a rich condition in my 93 and have found what might be a problem. The fuel vapor canister purge valve assembly has hoses going into it but none coming out. Can someone check their 93 and tell me what I am missing.
Thanks
Fred
Thanks
Fred
Instructor
Joined: Apr 2008
Posts: 204
Likes: 0
well since noone else is stepping up maybe I can try to help. I have a 92. And I can forsee that I may making requests like this myself in the future...
Could you post a pic of what you have there so I can see what you are missing? And seeing it may help me locate it quickly.... I only have a short period of daylight when I get home, been putting on my greasey clothes and trying to clean up the lt1 tarpit a little at a time. If you can post by 7:00pm CST (3 hours from now) I should be able to get back to you later tonight
Could you post a pic of what you have there so I can see what you are missing? And seeing it may help me locate it quickly.... I only have a short period of daylight when I get home, been putting on my greasey clothes and trying to clean up the lt1 tarpit a little at a time. If you can post by 7:00pm CST (3 hours from now) I should be able to get back to you later tonight
Safety Car
Joined: Jun 2006
Posts: 3,629
Likes: 28
From: FL
If your vacuum routing label is still present you can verify one goes to the throttle body (top hose in pic) the other to the canister (connected with rusty spring clamp) (note the open port on the throttle body here is the connection for the PCV fresh air tube, removed to show the evap solenoid better)
Safety Car
Joined: Jun 2006
Posts: 3,629
Likes: 28
From: FL
I sent you a PM with directions to forum "X", look forward to meeting you.
Thread Starter
Burning Brakes
Joined: May 2005
Posts: 917
Likes: 55
From: Muskoka Ontario
Thanks for the picture is worth a thousand words. I am grasping at straws as it is running pig rich. I have changed the map sensor, 02 sensors, and iat sensor and it used a quarter tank of gas for 50 miles.
I am at a loss so she is going into the garage tomorrow. I see by the picture that there is no hose on the other end of the canister purge valve.
Thanks again
Fred
I am at a loss so she is going into the garage tomorrow. I see by the picture that there is no hose on the other end of the canister purge valve.
Thanks again
Fred
Safety Car
Joined: Jun 2006
Posts: 3,629
Likes: 28
From: FL
If you have a scan tool take a look at the coolant sensor values before you take it in, good luck. Another thought would be a bad diaphragm in the fuel pressure regulator, pull the vacuum line and check for fuel? Have you checked the pressure?
Last edited by toptechx6; May 16, 2008 at 05:59 PM. Reason: additional suggestion
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Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Something's not right. I believe the hose connected to the top hose bib on the throttle body connects to the coolant vent tubes at the back of each cylinder head. I'll check that just to be sure.
My PCV hose connects to the front of the intake manifold.
I'll pull my passenger side cover just to make sure and I'll post my results.
Of course, mine's a 96 so it might be different.
Jake
My PCV hose connects to the front of the intake manifold.
I'll pull my passenger side cover just to make sure and I'll post my results.
Of course, mine's a 96 so it might be different.
Jake
Last edited by JAKE; May 16, 2008 at 05:35 PM. Reason: 2nd Thoughts
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Check me if I'm wrong that.
Jake
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Well, there's something amiss here.
Since I'm in D.C. and my Insider Hints booklet is in Texas, I can't quote page number, but the TPIS website tells a different story.
Their site says the preferred setting is 47-48 psi, engine idling, vacuum hose disconnected.
Jake
Since I'm in D.C. and my Insider Hints booklet is in Texas, I can't quote page number, but the TPIS website tells a different story.
Their site says the preferred setting is 47-48 psi, engine idling, vacuum hose disconnected.
Jake
Race Director
Joined: Jan 2002
Posts: 12,261
Likes: 85
From: O'Fallon Missouri
Directly from TPIS' web page.
"Since we introduced our Fuel Pressure Regulator in 1987, GM has adopted on the '88-'90 vehicles the fuel pressure that we have found to work well on the '85-'87's. For the '88-'90, we find that 49-52 works well. The LT1 fuel pressure is unusually high for the way the computer is calibrated. We are finding that, unless you send us your computer for reprogramming, you will be faster at 39 PSI, with a stock to bolt on modded engine. Installation time: 30 minutes. Lifetime guarantee. Emission-legal in all 50 states (EO Number 235-2).
This is one of the main tuning tools for wide open throttle, it's like changing main jets on a carburator, but with a simple turn of the screw. If you bring your car to a dyno with a wide band air fuel ratio gauge, this will fine tune the air fuel ratio. Don't forget to pick up a fuel pressure test gauge."
"Since we introduced our Fuel Pressure Regulator in 1987, GM has adopted on the '88-'90 vehicles the fuel pressure that we have found to work well on the '85-'87's. For the '88-'90, we find that 49-52 works well. The LT1 fuel pressure is unusually high for the way the computer is calibrated. We are finding that, unless you send us your computer for reprogramming, you will be faster at 39 PSI, with a stock to bolt on modded engine. Installation time: 30 minutes. Lifetime guarantee. Emission-legal in all 50 states (EO Number 235-2).
This is one of the main tuning tools for wide open throttle, it's like changing main jets on a carburator, but with a simple turn of the screw. If you bring your car to a dyno with a wide band air fuel ratio gauge, this will fine tune the air fuel ratio. Don't forget to pick up a fuel pressure test gauge."
