 Running too rich ?, Bad MPG too |
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| johannes |
 May 2 2008, 07:44 AM
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#1
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Club Porsche 914 France President  Group: Members Posts: 3,084 Joined: 13-January 06 From: France Member No.: 5,409 Region Association: France  |
I have a 1975 1.8 (L-jet) with all the cat stuff removed.
The car runs strong (I believe), I can reach 110 mph. But when driving slow I get bad mpg (about 20 when other achieve 30) and my exhaust has black dirt. I suspect my car is running too rich. Can this be the cause of bad milage ? When I let the car checked they found 0.8 CO. is this OK ? How can I test, fix, improve, ajust ? |
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Replies(1 - 8)
| dr914@autoatlanta.com |
May 2 2008, 08:07 AM
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#2
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914 Guru Group: Members Posts: 7,896 Joined: 3-January 07 From: atlanta georgia Member No.: 7,418 Region Association: None |
QUOTE(johannes @ May 2 2008, 06:44 AM)  I have a 1975 1.8 (L-jet) with all the cat stuff removed. The car runs strong (I believe), I can reach 110 mph. But when driving slow I get bad mpg (about 20 when other achieve 30) and my exhaust has black dirt. I suspect my car is running too rich. Can this be the cause of bad milage ? When I let the car checked they found 0.8 CO. is this OK ? How can I test, fix, improve, ajust ? I would suggest maybe if that rich 8.0 co. Anyway maybe the flap in the air flow meter is sticking. That would certainly cause the low speed problem. Check it when the car is very hot and everything in the flow meter has expanded. Pry off the top and check the spring loaded pointer. If it sticks or squeeks that is the problem. If the fuel pump runs constantly when the key is turned on that is an indication that the flap is sticking as well |
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| johannes |
May 2 2008, 08:40 AM
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#3
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Club Porsche 914 France President Group: Members Posts: 3,084 Joined: 13-January 06 From: France Member No.: 5,409 Region Association: France |
When I say "low speed" I mean 50 60 mph. I should achieve 30 mpg at theese speeds.
I tested the key. Seems OK. Pump doesn't run until the engine runs. |
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| Bleyseng |
May 2 2008, 09:20 AM
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#4
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Aircooled Baby! Group: Members Posts: 13,035 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
Have access to a AFM like a LM 1 meter? I adjusted my Ljet Westy using one to set the AFR to 14.2 to 1 under load at 2500rpms.
To adjust the AFM you pop off the cover and loosen the little screw and move the wiper ever so slightly and retighten. When you are done you must check the pump shutoff arm and readjust that too so the pump shuts off when the wipe is a rest. I can post of pic of the inside of the AFM if you want. (IMG:style_emoticons/default/idea.gif) |
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| johannes |
May 2 2008, 09:30 AM
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#5
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Club Porsche 914 France President Group: Members Posts: 3,084 Joined: 13-January 06 From: France Member No.: 5,409 Region Association: France |
QUOTE I can post of pic of the inside of the AFM if you want. this may help ! (IMG:style_emoticons/default/wink.gif) ... |
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| dr914@autoatlanta.com |
May 2 2008, 09:35 AM
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#6
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914 Guru Group: Members Posts: 7,896 Joined: 3-January 07 From: atlanta georgia Member No.: 7,418 Region Association: None |
QUOTE(johannes @ May 2 2008, 07:40 AM) When I say "low speed" I mean 50 60 mph. I should achieve 30 mpg at theese speeds. I tested the key. Seems OK. Pump doesn't run until the engine runs. Wow high speed man! I would put a probe in the pipe and check the air to fuel ratio at that speed |
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| Bleyseng |
May 2 2008, 09:23 PM
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#7
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Aircooled Baby! Group: Members Posts: 13,035 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
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| rhodyguy |
May 2 2008, 09:27 PM
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#8
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Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,092 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
very cool. saved that picture and text.
k |
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| johannes |
May 3 2008, 05:03 PM
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#9
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Club Porsche 914 France President Group: Members Posts: 3,084 Joined: 13-January 06 From: France Member No.: 5,409 Region Association: France |
QUOTE(Bleyseng @ May 2 2008, 07:23 PM) Thank you ! this is very helpfull. (IMG:style_emoticons/default/bye1.gif) |
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