 Black plugs on 75 2.0, Conytol Unit adjustment |
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| porschefile2010 |
 Jan 18 2014, 02:07 PM
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#1
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Member  Group: Members Posts: 228 Joined: 26-May 11 From: Whangaparaoa, New Zealand Member No.: 13,118 Region Association: Australia and New Zealand  |
Just pulled the plugs after 1500 miles on a rebuild and they are all evenly black. Can I adjust the screw on the control unit to lean it up a bit and if so which way and by how much? Thanks once again. Richard
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Replies(1 - 12)
| dlee6204 |
Jan 18 2014, 02:59 PM
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#2
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Howdy Group: Members Posts: 2,162 Joined: 30-April 06 From: Burnsville, NC Member No.: 5,956 |
The knob on the ECU will only adjust your mixture at idle.
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| SLITS |
Jan 18 2014, 03:35 PM
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#3
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None  |
Check your fuel pressure and ignition system.
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| porschefile2010 |
Jan 18 2014, 03:49 PM
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#4
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Member Group: Members Posts: 228 Joined: 26-May 11 From: Whangaparaoa, New Zealand Member No.: 13,118 Region Association: Australia and New Zealand |
Thanks. So I have the idle adjustment on the throttle body screwed right in and it is still revving at 1100. Should I adjust the ECU to bring the idle down to, say 900 ? The idle at 1100 is very smooth and the engine is pulling well but I suspect is rich and using too much fuel.
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| SLITS |
Jan 18 2014, 06:22 PM
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#5
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None |
You have a vacuum leak ..........
Leaking AAR... plug it off and see what happens Cracked hoses Cracked elbows that mount lines to plenum Crack in the plenum There are 22 clicks on the ECU from full lean to full rich. The cars I have set up are generally 11 - 13 clicks from full lean. That otta keep you busy for a bit. |
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| porschefile2010 |
Jan 18 2014, 08:56 PM
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#6
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Member Group: Members Posts: 228 Joined: 26-May 11 From: Whangaparaoa, New Zealand Member No.: 13,118 Region Association: Australia and New Zealand |
Thanks for that. That will be really helpful. I went over all vacuum hoses earlier in the week and replaced a couple and added hose clips to them all where they were missing. So I might have a careful play with the ecu even if it's just to find out where it's set at the moment. Appreciate the help.
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| boxsterfan |
Jan 20 2014, 11:26 AM
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#7
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914's are kewl Group: Members Posts: 1,776 Joined: 6-June 03 From: San Ramon, CA Member No.: 791 Region Association: Northern California |
Have you looked at your Air Flow Sensor? Timing, dwell and spark plug gap?
How about your fuel injectors? Are they spraying a fine mist? Here is a link to troubleshooting L-Jet systems from Bowlsby's site. Note: this is for a 912E (same motor...type IV 2.0L.) https://bowlsby.net/914/Classic/zTN_Man08.pdf |
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| r_towle |
Jan 20 2014, 11:31 AM
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#8
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Custom Member Group: Members Posts: 24,577 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States 
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1500 miles on a rebuild.
Have you done a leakdown test to see if your rings are seated properly? How many times have you adjusted your valves in the past 1500 miles? Rich |
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| Cap'n Krusty |
Jan 20 2014, 11:50 AM
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#9
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
QUOTE(boxsterfan @ Jan 20 2014, 09:26 AM)  Have you looked at your Air Flow Sensor? Timing, dwell and spark plug gap? How about your fuel injectors? Are they spraying a fine mist? Here is a link to troubleshooting L-Jet systems from Bowlsby's site. Note: this is for a 912E (same motor...type IV 2.0L.) https://bowlsby.net/914/Classic/zTN_Man08.pdf Not gonna help a D-jet owner all that much .................. The Cap'n |
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| boxsterfan |
Jan 20 2014, 12:00 PM
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#10
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914's are kewl Group: Members Posts: 1,776 Joined: 6-June 03 From: San Ramon, CA Member No.: 791 Region Association: Northern California |
QUOTE(Cap'n Krusty @ Jan 20 2014, 09:50 AM) Not gonna help a D-jet owner all that much .................. The Cap'n Doh!! |
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| porschefile2010 |
Jan 20 2014, 05:35 PM
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#11
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Member Group: Members Posts: 228 Joined: 26-May 11 From: Whangaparaoa, New Zealand Member No.: 13,118 Region Association: Australia and New Zealand |
Have you done a leakdown test to see if your rings are seated properly?
How many times have you adjusted your valves in the past 1500 miles? Rich [/quote] Hi Rich. Thanks for that. We did the valve adjustment after 500 miles along with an oil and filter change. We will do another valve adjust in 1500 miles. But I am thinking I will fix my electrical issues next as there seems to be a body of opinion that poor functioning battery/alternator issues may affect the D Jet? The little car has a bad earth leak. So battery is in good nick but is dead after about three days sitting but ok if used every day. Weird thing is when I shut down after a drive there sound like there is something running behind the radio somewhere. Like a whirring sound of a very small fan or similar. So I have a really good sparky looking at it tomorrow. Also did a rough check on my mpg and in US numbers seems like about 22mpg. Not good. Thanks for the help . Richard |
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| stugray |
Jan 20 2014, 05:40 PM
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#12
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Advanced Member Group: Members Posts: 3,824 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
QUOTE You have a vacuum leak .......... I thought that a vacuum leak would make it run lean because there is more air entering the system than is being measured so too little fuel is being added. Just curious. porschefile2010 - Do you have any friends with an Air Fuel Ratio meter? You can get the kind that you just stick up the tailpipe. That would tell you right away if you are running rich. |
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| porschefile2010 |
Jan 20 2014, 05:46 PM
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#13
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Member Group: Members Posts: 228 Joined: 26-May 11 From: Whangaparaoa, New Zealand Member No.: 13,118 Region Association: Australia and New Zealand |
QUOTE(stugray @ Jan 21 2014, 12:40 PM) QUOTE You have a vacuum leak .......... I thought that a vacuum leak would make it run lean because there is more air entering the system than is being measured so too little fuel is being added. Just curious. porschefile2010 - Do you have any friends with an Air Fuel Ratio meter? You can get the kind that you just stick up the tailpipe. That would tell you right away if you are running rich. Interesting. I thought than when you had a vacuum leak the sytem thought there was too much air so threw in more fuel than was needed. So I am sure someone will put us straight on that one. I can get hold of an AFR when we do the next valve set but I can't see any other reason for the plugs to be black, exactly the same on all four. Unless it was oil coming through but it's not a heavy deposit. Also with the mpg it just seemed there was too much fuel going in. |
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