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Registered
Join Date: Oct 2010
Location: N. of Boston
Posts: 319
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O2 Sensor solves idle, but causes other issue.
My '82 SC came without a cat & O2. I am in a no emissions state. Car was running great last year, but this Spring the idle started to hunt and the car would sometimes stall if I blip the throttle at idle.
Asked my shop to look at it and discovered PO did not install an O2 sensor in the bung of the SSI's. Shop put in a single wire sensor so he could check/adjust the mixture. Car now starts great, and idles right down after a short warm up; but I find that at 2100+/- RPM, (you know 3-4th gear cruising around town) which I do so often the car seems to hunt a little with the revs going up and down. Since the car is moving in gear I think the hunting is actually masked a little bit. As I said the car starts, accelerates and generally runs great except at this RPM range. I was thinking of unplugging the 02 to see if it changes. Any comments? Thanks.
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G. Hamilton '82 SC Guards Red-2nd time owned-Now sold "Bumerang" '70 TR6 N of Boston |
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07-16-2011, 03:29 PM
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Location: N. of Boston
Posts: 319
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After 100 miles of driving I definately feel the slight surging at 1900-2100 rpm.
Kinda annoying. Anyone have any input? Thanks for your help.
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G. Hamilton '82 SC Guards Red-2nd time owned-Now sold "Bumerang" '70 TR6 N of Boston |
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07-19-2011, 08:11 AM
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RETIRED
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Surging is usually a vacuum leak. Tach surging/bounce can be sign of an alternator/regulator about to go tits up.
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1983/3.6, backdate to long hood 2012 ML350 3.0 Turbo Diesel |
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07-19-2011, 08:15 AM
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Join Date: Nov 2005
Location: CA
Posts: 7,286
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I used to have surge once in a while when it get way too hot. There were 2 things I did and it's gone. 1- change spark plugs from platium to the famous copper NGK. This also got rid of the missing once in a while when it's too cold/wet. 2- my buddy played with adjusting my idle adjustment screw.
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Fat butt 911, 1987 |
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07-19-2011, 08:24 AM
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Join Date: Oct 2010
Location: N. of Boston
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I tend to doubt it's vacum, as it started right after we installed the 02 & set the mixture.
Car idles perfect and runs great otherwise..
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G. Hamilton '82 SC Guards Red-2nd time owned-Now sold "Bumerang" '70 TR6 N of Boston |
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07-19-2011, 08:29 AM
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RETIRED
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Pull a plug and see what's what.....platinum plugs suck. For kicks and giggles, throw a meter on the battery posts....
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1983/3.6, backdate to long hood 2012 ML350 3.0 Turbo Diesel |
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07-19-2011, 08:31 AM
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Join Date: Mar 2001
Location: Marysville Wa.
Posts: 22,431
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that's what you get with the sensor connected. annoting isn't it? the original surging/dying at idle was probably just a too rich initial idle setting, and maybe a too low idle speed. shoulda tried it at 3% CO @ 1000 rpm idle.
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https://www.instagram.com/johnwalker8704 8009 103rd pl ne Marysville Wa 98270 206 637 4071 |
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07-19-2011, 09:35 AM
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Da cab
