 76 2.0 fuel injected motor has surging idle..., What are the first things to look for? |
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| wbergtho |
 Oct 31 2008, 08:58 PM
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#1
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Senior Member  Group: Members Posts: 1,314 Joined: 28-April 03 From: Roberts, WI Member No.: 623  |
My motor surges up and down at idle (500-700 rpm). I have looked at all the vacuum hoses and they look ok. What else might be causing this? I know more about my V-8 car than this 2.0 stock fuel injected motor. Thanks for any suggestions. (IMG:style_emoticons/default/biggrin.gif)
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| sean_v8_914 |
Oct 31 2008, 09:16 PM
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Chingon 601 Group: Members Posts: 4,011 Joined: 1-February 05 From: San Diego Member No.: 3,541 |
timing is off so the idle air bypass is wrong to compensate AND the idle mix adj on teh ecu is lean
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| Krieger |
Nov 1 2008, 10:11 AM
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#3
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Advanced Member Group: Members Posts: 4,721 Joined: 24-May 04 From: Santa Rosa CA Member No.: 2,104 Region Association: None 
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Cracked plenum-look around the 2 "holes" that are hollow studs that pass through the middle of plenum. Take off factory air cleaner. Get a propane tank and hook a hose to the valve. With the engine running spray a little propane gas in around the intake parts. Propane kills the engine. You may want to get a "fresh air" hose to the air intake so the motor get good air.
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| r_towle |
Nov 1 2008, 10:23 AM
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#4
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Custom Member Group: Members Posts: 24,584 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
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Unplug and block off all vacuum lines to the plenum except the MPS.
Block off the advance and retard ports on the throttle body also. After that...does it still do it? Rich |
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