Will it ever end? Not looking good! |
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Will it ever end? Not looking good! |
customstarr |
Jun 19 2007, 06:09 PM
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#1
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King of the Nighttime World Group: Members Posts: 116 Joined: 13-February 07 From: Waterford, Michigan - Home of Waterford Hills Road Racing Member No.: 7,531 |
My car still idles like pure crap. Very inconsistent - high to low surging, super low, rich... you name it, this car's idle is ALL OVER THE PLACE. It's never the same condition. The car runs like a raped ape and goes good, but the idle sux complete ass. I used to be able to get some idle adjustment at the TB screw (I don't have the ECM screw), but today I set the fuel pressure correctly (was at 42 PSI) and now I have no control over the idle mix/speed. Maybe someone in the past tried to cover the problem by cranking up the fuel pressure. I'm not seeing the super rich condition now, but like I said... no control.
I've been through everything: replaced/fixed wiring, new ignition system, battery, cables, checked all the standard fare + what I've listed below, etc. This is getting ridiculous. What I've replaced thus far: 1. Ignition: Coil, Cap, Rotor, Points, Condenser, Plugs, Wires (all Bosch except plugs). 2. Fuel/D-Jet: TS1, Fuel Filter, Vacuum Lines. What I've checked, adjusted to spec, or tested to be good: 1. Ignition: Points, Timing, Trigger Points. 2. Fuel/D-Jet: MPS, TS2, Fuel Pressure Reg, Cold Start Valve, Aux Air Reg, Injectors, Fuel Lines, Fuel Pump, Throttle Body, Throttle Switch. 3. Engine: Timing, Compression, Valves. |
scotty b |
Jun 19 2007, 06:28 PM
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#2
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rust free you say ? Group: Members Posts: 16,375 Joined: 7-January 05 From: richmond, Va. Member No.: 3,419 Region Association: None |
Nope I can't get to the engine for all of the sh*t I have piled up. Maybe somebody else will know what I am talking about.
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Johny Blackstain |
Jun 19 2007, 06:50 PM
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#3
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Walnut Elite Stratocaster player Group: Members Posts: 3,434 Joined: 5-December 06 From: The Shenandoah River Member No.: 7,318 Region Association: MidAtlantic Region |
Nope I can't get to the engine for all of the sh*t I have piled up. Maybe somebody else will know what I am talking about. Scotty- does this help? 74 D-jet w/ air filter removed- (IMG:style_emoticons/default/cool_shades.gif) Attached image(s) |
scotty b |
Jun 19 2007, 06:56 PM
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#4
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rust free you say ? Group: Members Posts: 16,375 Joined: 7-January 05 From: richmond, Va. Member No.: 3,419 Region Association: None |
[quote name='Johny Blackstain' date='Jun 19 2007, 04:50 PM' post='913326']
(IMG:style_emoticons/default/cool.gif)--><div class='quotetop'>QUOTE(scotty b @ Jun 19 2007, 08:28 PM) </div><div class='quotemain'><!--quotec--> Nope I can't get to the engine for all of the sh*t I have piled up. Maybe somebody else will know what I am talking about. [/quote] Scotty- does this help? 74 D-jet w/ air filter removed- (IMG:style_emoticons/default/cool_shades.gif) [/quote] Kionda. It's right there under the #1 runner where the 3 hoses seem to intersect. All I remember is there is also a small steel body with 2 ports down there also that the "Y" connects in with. See the green hoses from the intake boot and the air filter? That is the metal part and the rubber piece is there as well. Somebody will know it (IMG:style_emoticons/default/headbang.gif) Attached image(s) |
customstarr |
Jun 19 2007, 08:12 PM
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#5
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King of the Nighttime World Group: Members Posts: 116 Joined: 13-February 07 From: Waterford, Michigan - Home of Waterford Hills Road Racing Member No.: 7,531 |
My car is plumbed exactly like the diagram. Intake boot to Aux Air Valve, Air filter to Oil Breather, Throttle body to distributor x 2, Intake to MPS, and AIr Cleaner to Canister. I'm not aware of any "Y" connectors, or any additional hoses. This is a 1971 D-Jet just for clarification.
I'll look for more vac leaks, but I'm not aware of any at the intake. |
dr914@autoatlanta.com |
Jun 20 2007, 03:44 PM
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#6
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914 Guru Group: Members Posts: 8,055 Joined: 3-January 07 From: atlanta georgia Member No.: 7,418 Region Association: None |
My car is plumbed exactly like the diagram. Intake boot to Aux Air Valve, Air filter to Oil Breather, Throttle body to distributor x 2, Intake to MPS, and AIr Cleaner to Canister. I'm not aware of any "Y" connectors, or any additional hoses. This is a 1971 D-Jet just for clarification. I'll look for more vac leaks, but I'm not aware of any at the intake. your car (71) is prone to lean idle (high low idle) as the control unit is not adjustible in the early cars (no knob) and with old injectors and vacuum leaks (make sure that the aux air valve is closing by removing the hose to the u shaped intake boot and making sure that it is not sucking vacuum) When this is verified you can then as the car hi low idles spray carb cleaner around all of the fittings to see if the idle changes. If to no avail, and you have carefully checked everything you said (including proper routing of all of the vacuum lines and ascertained that the vacuum advance/retard is working properly, and remember that AUX AIR VALVE to make sure it is closing when the engine is hot) for the hell of it, install an inline 270 ohm resistor with the head temp sensor to richen the idle mixture and see what happens. |
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