 Idle hunting, Where do I start? |
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| steuspeed |
 Mar 16 2021, 07:24 PM
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#1
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Senior Member  Group: Members Posts: 1,008 Joined: 12-July 11 From: Portland, Oregon Member No.: 13,308 Region Association: Pacific Northwest  |
I'm working on fixing my idle search. All new vacuum lines, plugs and wires. Car starts and runs smooth for about 1-2minutes, then the idle dumps and starts hunting up and down. My ECU knob was turned full clockwise by the PO. I turned it back to the factory setting.
Stock 2.0L 1973 car with Pertronix. Where should I look next? |
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| rjames |
Mar 17 2021, 01:14 AM
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#2
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I'm made of metal Group: Members Posts: 4,157 Joined: 24-July 05 From: Shoreline, WA Member No.: 4,467 Region Association: Pacific Northwest 
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Are you sure no vacuum leaks?
Does changing the position of the ECU knob do anything? Are all of the FI parts correct for your car? Has the MPS been rebuilt or futzed with? |
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| steuspeed |
Mar 17 2021, 05:17 PM
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#3
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Senior Member Group: Members Posts: 1,008 Joined: 12-July 11 From: Portland, Oregon Member No.: 13,308 Region Association: Pacific Northwest |
QUOTE(rjames @ Mar 17 2021, 12:14 AM)  Are you sure no vacuum leaks? Does changing the position of the ECU knob do anything? Are all of the FI parts correct for your car? Has the MPS been rebuilt or futzed with? Pretty sure no vacuum leaks. Car start and runs nice. I can adjust the idle to say 1100 for warm up. After about 1 min the idle drops and starts hunting. It will hunt and die with the ECU knob in the factory location. If I turn the knob fully clockwise it will still hunt but barley stay alive. The MPS epoxy is gone, so someone has at least turned the outer screw. I tried to get it out, but it only turns about 2x back and forth. The coils read 87.6 ohms and 339.7 ohms. No continuity between coils. I believe all the FI parts are correct and there except Decel valve has been removed. Caps on air box. |
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Posts in this topic
steuspeed Idle hunting Mar 16 2021, 07:24 PM
Bleyseng Do you have the resistor installed? Mar 16 2021, 11:36 PM
steuspeed I see a white wire/connector/black wire to cylinde... Mar 17 2021, 04:59 PM wonkipop not sure i can help as have a 1.8 L jet.
but have ... Mar 17 2021, 01:24 AM BeatNavy I think you're running lean. You need to trou... Mar 17 2021, 05:50 PM steuspeed
I think you're running lean. You need to tro... Mar 18 2021, 03:36 PM 914werke :agree: hunting idle is usually a symptom of lean ... Mar 17 2021, 06:09 PM steuspeed
:agree: hunting idle is usually a symptom of lean... Mar 18 2021, 12:09 AM mgphoto Most times it’s the idle screw on the throttle b... Mar 17 2021, 09:44 PM steuspeed
Most times it’s the idle screw on the throttle ... Mar 18 2021, 12:10 AM cary Concur with Rob & Rich, too lean. Mar 17 2021, 11:01 PM BeatNavy I wouldn't worry too much about the idle bypas... Mar 18 2021, 05:18 AM steuspeed
I wouldn't worry too much about the idle bypa... Mar 18 2021, 03:38 PM saigon71 Agreed that you are running lean at idle.
Start... Mar 19 2021, 05:33 AM JamesM
Agreed that you are running lean at idle.
Star... Mar 19 2021, 08:45 AM rjames
Agreed that you are running lean at idle.
Sta... Mar 19 2021, 11:39 AM 914_7T3 My ‘73 had the same symptoms and it was indeed t... Mar 19 2021, 01:28 PM |
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