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Old 10-11-2019, 10:21 PM   #1
Redheaded sailor bum
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Default Rough idle? 940

So I just cleaned the MAF and still has a rough idle I'm not sure if it could be a vacuum leak be cause most of the vaccum ports have been capped
It starts and runs great no problems there but at idle it'll only itll flutter up and down and run rough along with if I go from high boost and I put the clutch in to either coast or putting it in neutral itll drop down and the engine will stall
Any ideas?
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Old 10-12-2019, 11:51 AM   #2
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Is it a rough idle or is the idle "hunting"?
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Old 10-12-2019, 03:16 PM   #3
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More hunting it is either 600 or 1000 idle but the engine shakes a little not like a a misfire but more like a caammed feel I guess
It also doesnt have a o2 sensor but I doubt that's the issue
It has a megnaflow cat and muffler as well
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Old 10-12-2019, 03:18 PM   #4
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Like I said it runs and drives just fine but doesnt run smooth
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Old 10-14-2019, 11:48 AM   #5
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Having what sounds like the same issue with mine and can't figure it out for the life of me. I feel like we've gone through anything it could be and it hasn't always done it.
Compression is good, tried different MAFs, different injectors, changed crusty vacuum lines, checked plugs and wires and swapped dizzy all without luck.
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Old 10-14-2019, 01:27 PM   #6
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Clean the inevitably filthy throttle plate and throttle body, and check IAC motor for functionality. I have cleaned them with a solvent/lubricant with good luck.
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Old 10-14-2019, 02:30 PM   #7
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Quote:
Originally Posted by Redheaded sailor bum View Post
More hunting it is either 600 or 1000 idle but the engine shakes a little not like a a misfire but more like a caammed feel I guess
It also doesnt have a o2 sensor but I doubt that's the issue
It has a megnaflow cat and muffler as well
The O2 sensor is a critical part in maintaining the correct fuel/air mixture, yet, you doubt that could be the issue. Think again.
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Old 10-14-2019, 04:23 PM   #8
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The O2 sensor is a critical part in maintaining the correct fuel/air mixture, yet, you doubt that could be the issue. Think again.
Yeah I missed this. I have direct experience with this too. Some cars you can (somehow) get away with not having your narrowband hooked up. These cars are not one of them.
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Old 10-15-2019, 08:48 AM   #9
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Throttle body clean #1
Replace all vacuum hoses #2
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Old 10-15-2019, 12:02 PM   #10
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Step 1: fix all hack work.
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Old Yesterday, 02:02 PM   #11
Redheaded sailor bum
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Step 1: fix all hack work.
Ahaha wish it was that simple
It's just a track car for drifting if it's the 02 sensor I'm not worried to much about it I'm gonna try and clean the iac and throttle if that doesnt work then I'm gonna gonna assume it's an 02
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Old Yesterday, 03:02 PM   #12
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Ahaha wish it was that simple
It's just a track car for drifting if it's the 02 sensor I'm not worried to much about it I'm gonna try and clean the iac and throttle if that doesnt work then I'm gonna gonna assume it's an 02
Why not just connect the o2 sensor? Itís literally 3 wires man.
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Old Yesterday, 04:06 PM   #13
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With such an obvious defect in your system you're wasting your time chasing this issue. The oxygen sensor is effectively the building block of LH 2.4.
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