Surging idle has me stumped. (with video)
08-01-2015, 03:28 PM
#21
I had a similar problem and it ended up being the throttle cable.
A plastic clip had broken and it wouldn't sit / return properly.
Very frustrating. Took me a long time to source an OEM replacement cable too.
A plastic clip had broken and it wouldn't sit / return properly.
Very frustrating. Took me a long time to source an OEM replacement cable too.
08-01-2015, 08:59 PM
#22
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I had a mildly surging idle that I thought was cam surge. Injector o ring was bad.
08-01-2015, 11:58 PM
#23
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Yeah a lot of times they'll pass that bench test, but right after start up, at idle, your alternator is charging the battery introducing a large load, then with your fans kicking on its running that's too. Plus the entire and any other accessories you have on like the radio etc. I dint know what they loaf test then to, if they load them at all, but it seems like the alternator is kicking in and off battery charge mode causing the engine idle to fluctuate. Can you read the IAC counts when it's doing the surging? Does that fluctuate too?
I do notice a supercharger style whine at higher rpm's... Another project for me to trace down. I have had quite a few annoyances to track down with this car. Could be alternator related?
May be worth checking out your alternator theory! I will report back on this one when I have time.
08-01-2015, 11:59 PM
#24
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I checked the TB.. it returns fully and seats correctly. Thanks for the suggestion though! I bet that thing was a PITA to source!
08-02-2015, 12:01 AM
#25
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I had a mildly surging idle that I thought was cam surge. Injector o ring was bad.
Attachment 507880
Attachment 507880
It almost looks as though that o-ring was pinched during an installation?
08-02-2015, 12:17 PM
#26
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It was worse when cold than hot. It was probably pinched during installation. What prompted me to pull the injectors was swapping in a set of MMS220 heads and fast 102.
But if you get the car idling you can shoot wd40 at you injector bases. If one of them changes idle, you've got it. O rings can dry out and crack too.
But if you get the car idling you can shoot wd40 at you injector bases. If one of them changes idle, you've got it. O rings can dry out and crack too.
08-02-2015, 12:17 PM
#27
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Also it was way worse with the AC than without