Idle surge and running rich. Input please

Dark_5.0 · 09-10-2007, 04:44 PM

Your fuel pressure should be at 38 psi with the vacuum off.

To set idle and TPS.

Back off the idle adjustment screw until you can fit a .10 feeler gauge between it and the plate. Then turn in the adjustment screw 1/2 turn. Now adjust the TPS voltage to .93-.99.

If the bad idle persist you may have a vacuum leak or a bad mass air meter.

Pull codes if all else fails and post back up.

USMC302 · 09-11-2007, 10:52 PM

Seems like I always bring up the same things in these forums, LOL......What's your timing set at? And yes I have to ask, what size and type of Mass Air Meter are you running, does it have the right tube in it for the 24lbers?

Dog5ohfun · 09-12-2007, 07:41 PM

Hey everyone, thanks for the input so far. I haven't had a chance to spend time with the car. Yes they are always the same answers to the same question. I will try to baseline the throttle plate. I know the mass air meter is correct for the injectors as I bought them together as a set. Timing is at 14 degrees. I am leaning towards the possibility of a vacuum leak. Will keep you posted.

Dog5ohfun · 12-21-2007, 02:25 AM

Just a quick post to thank all you of for your help and input. About a week ago I finally had some time to work on the car. Changed the upper intake gaskets (yes plural I have two 1/2" phenolic spacers). The car seemed to idle fine in the driveway. I haven't driven it as it is not a winter car, no heater. I will eventually re baseline the throttle body and see how it goes from there. As for the TPS it is always at .98 volts as I have the digital TPS monitor installed. Thanks again and Happy Holidays.

09-10-2007, 04:44 PM	#1
Dark_5.0 Registered Member Join Date: Apr 2001 Location: Staging lane Posts: 4,337	Re: Idle surge and running rich. Input please Your fuel pressure should be at 38 psi with the vacuum off. To set idle and TPS. Back off the idle adjustment screw until you can fit a .10 feeler gauge between it and the plate. Then turn in the adjustment screw 1/2 turn. Now adjust the TPS voltage to .93-.99. If the bad idle persist you may have a vacuum leak or a bad mass air meter. Pull codes if all else fails and post back up. __________________ 92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer

09-11-2007, 10:52 PM	#2
USMC302 Registered Member Join Date: Apr 2001 Location: Gallatin, Tn Posts: 1,326	Re: Idle surge and running rich. Input please Seems like I always bring up the same things in these forums, LOL......What's your timing set at? And yes I have to ask, what size and type of Mass Air Meter are you running, does it have the right tube in it for the 24lbers? __________________

09-12-2007, 07:41 PM	#3
Dog5ohfun Registered Member Join Date: Feb 2002 Location: Arlington, Washington Posts: 92	Re: Idle surge and running rich. Input please Hey everyone, thanks for the input so far. I haven't had a chance to spend time with the car. Yes they are always the same answers to the same question. I will try to baseline the throttle plate. I know the mass air meter is correct for the injectors as I bought them together as a set. Timing is at 14 degrees. I am leaning towards the possibility of a vacuum leak. Will keep you posted. __________________ Black 1990 LX DSS Racing Super Pro Bullit 331, AFR 185, Anderson B31 Cam, 1.6 DSS rockers, Cobra Intake w/ 2 phenolic spacer, Aluminum DS, 3.73 gears, Tremec 3550, Lakewood SFI Bellhousing, MSD Digital 6+, Spintech Side Exhaust,

12-21-2007, 02:25 AM	#4
Dog5ohfun Registered Member Join Date: Feb 2002 Location: Arlington, Washington Posts: 92	Re: Idle surge and running rich. Input please Just a quick post to thank all you of for your help and input. About a week ago I finally had some time to work on the car. Changed the upper intake gaskets (yes plural I have two 1/2" phenolic spacers). The car seemed to idle fine in the driveway. I haven't driven it as it is not a winter car, no heater. I will eventually re baseline the throttle body and see how it goes from there. As for the TPS it is always at .98 volts as I have the digital TPS monitor installed. Thanks again and Happy Holidays. __________________ Black 1990 LX DSS Racing Super Pro Bullit 331, AFR 185, Anderson B31 Cam, 1.6 DSS rockers, Cobra Intake w/ 2 phenolic spacer, Aluminum DS, 3.73 gears, Tremec 3550, Lakewood SFI Bellhousing, MSD Digital 6+, Spintech Side Exhaust,

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