A couple of questions

sd88supra · 03-02-2008, 06:37 AM

1.) How can I prevent high idle when starting the engine cold on a cold day? If its about less than 50?F outside and I start my 87 N/A the idle will be about 1600 RPM. I know its normal for it to be higher, but I think thats way too high, and its killing gas.

2.) As far as ignition timing, should I keep the stock 10? BTDC or should I go up to 15? I heard 10 is really only necessary to pass emissions here in California, and that an advancement to 15 will give a slight improvement in power and fuel efficiency. True? I checked the timing and noticed it was at 15 so I put it back to 10 to pass emissions. That was this week though, and I haven't had a chance to test drive on the highway to look for a power improvement.

3. What is the purpose of the sub oxygen sensor (California car)? I replaced my regular oxygen sensor almost a year ago but I didn't do anything to the sub sensor. Is it the same model as the regular oxygen sensor? I'm guessing I should probably replace it.

Thanks in advance.

03-02-2008, 06:37 AM	#1
sd88supra 3" Exhaust Join Date: Oct 2005 Location: San Diego, Ca Posts: 190	A couple of questions 1.) How can I prevent high idle when starting the engine cold on a cold day? If its about less than 50?F outside and I start my 87 N/A the idle will be about 1600 RPM. I know its normal for it to be higher, but I think thats way too high, and its killing gas. 2.) As far as ignition timing, should I keep the stock 10? BTDC or should I go up to 15? I heard 10 is really only necessary to pass emissions here in California, and that an advancement to 15 will give a slight improvement in power and fuel efficiency. True? I checked the timing and noticed it was at 15 so I put it back to 10 to pass emissions. That was this week though, and I haven't had a chance to test drive on the highway to look for a power improvement. 3. What is the purpose of the sub oxygen sensor (California car)? I replaced my regular oxygen sensor almost a year ago but I didn't do anything to the sub sensor. Is it the same model as the regular oxygen sensor? I'm guessing I should probably replace it. Thanks in advance. __________________ -1987 5 spd N/A with TEMS: low miles! All stock with the exception of electric fans and an '89 front bumper, Yokohama 225/50/16 with stock rims. It's a mess and in the garage. -1987 5 spd Turbo with TEMS: miss-matched tires, needs lots of work, but it runs! Project car. -1988 N/A auto targa: all stock except 18" rims with Falken 265/35/18 in rear and 225/35/18 in front; daily driver.