 Knob on ecu |
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| stateofidleness |
 Aug 29 2010, 09:22 PM
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#1
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Senior Member  Group: Members Posts: 810 Joined: 1-September 07 From: Canyon Lake, Texas! Member No.: 8,065 Region Association: None  |
The knob on the ECU, I thought, is used to adjust the mixture of fuel/air?
I have it all the way clockwise, but changing it appears to not give any noticeable difference in the way the engine runs. Trying to chase a bad cold idle and trying to eliminate that as a possibility. Can someone educate me in the proper usage of that knob and what effect rotating clockwise/counter-clockwise will have? Thanks |
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Replies(1 - 9)
| championgt1 |
Aug 29 2010, 09:38 PM
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#2
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Don't embarrass me Filmore! Group: Members Posts: 2,680 Joined: 3-January 07 From: Tacoma, Washington Member No.: 7,420 Region Association: Pacific Northwest |
It is not fuel/air mixture. It is rich/lean fuel. Can't remember which way is what though.
Now that I think about it I believe clockwise is rich, counterclockwise is lean. |
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| Lennies914 |
Aug 29 2010, 09:50 PM
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#3
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Slacker Group: Members Posts: 828 Joined: 9-January 10 From: NorCal Member No.: 11,216 Region Association: Northern California  |
(IMG:style_emoticons/default/agree.gif) It is strickly for the idle circuit as I understand it
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| SLITS |
Aug 29 2010, 10:05 PM
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#4
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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  |
Clockwise richer, counterclockwise leaner.
Start in the middle of the range. One click at a time richer or leaner. Must run for a couple of minutes to stabilize. Idle only. |
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| tod914 |
Aug 30 2010, 06:57 AM
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#5
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Advanced Member Group: Members Posts: 3,755 Joined: 19-January 03 From: Lincoln Park, NJ Member No.: 170 |
If it's not making much difference when you adjust it, there might be some other issues going on. Here's a link to Brad's site. Some where on here, he goes over this.
http://members.rennlist.com/pbanders/DJetParts.htm |
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| gasman |
Aug 30 2010, 08:49 AM
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#6
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Member Group: Members Posts: 107 Joined: 21-January 08 From: Mooresville, nc Member No.: 8,602 Region Association: South East States |
Your TPS must be set correctly for your adjustment knob to make any changes
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| TheCabinetmaker |
Aug 30 2010, 08:53 AM
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#7
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I drive my car everyday Group: Members Posts: 8,304 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
Yep! The throttle position sensor must be properly set before the idle mixture screw wil make any difference. ECU knob will not make any difference in the way it runs, but a maladjust on the TPS will! Your crappy cold idle is more likely to be the head temp sensor.
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| stateofidleness |
Aug 30 2010, 09:02 AM
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#8
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Senior Member Group: Members Posts: 810 Joined: 1-September 07 From: Canyon Lake, Texas! Member No.: 8,065 Region Association: None |
actually, after removing the air cleaner assembly yesterday, I was able to see the CHT sensor better and it appeared to have oil around it where it screws in. Does this indicate anything and should it be replaced?
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| underthetire |
Aug 30 2010, 09:19 AM
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#9
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914 Guru Group: Members Posts: 5,062 Joined: 7-October 08 From: Brentwood Member No.: 9,623 Region Association: Northern California |
QUOTE(stateofidleness @ Aug 30 2010, 08:02 AM)  actually, after removing the air cleaner assembly yesterday, I was able to see the CHT sensor better and it appeared to have oil around it where it screws in. Does this indicate anything and should it be replaced? Sure your looking at the CHT ? Shouldn't be any oil out there, and if there was it should be burning off, and you'd have a hell of a leak somewhere. |
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| TheCabinetmaker |
Aug 30 2010, 11:02 AM
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#10
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I drive my car everyday Group: Members Posts: 8,304 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
QUOTE(underthetire @ Aug 30 2010, 10:19 AM) QUOTE(stateofidleness @ Aug 30 2010, 08:02 AM) actually, after removing the air cleaner assembly yesterday, I was able to see the CHT sensor better and it appeared to have oil around it where it screws in. Does this indicate anything and should it be replaced? Sure your looking at the CHT ? Shouldn't be any oil out there, and if there was it should be burning off, and you'd have a hell of a leak somewhere. I'm betting your looking at temp sensor 1, not the CHT (temp sensor 2). #1 is locasted below the plenum on a bracket. The cht is screwed into the head beside the #3 plug. It's screwed into a blind hole. There should be no oil there. Oh wait, you could be looking at the oil pressure sender. It could have lots of oil on it. |
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