Surging Idle After MAF Install...HELP

Stang_Crazy · 03-09-2002, 05:10 PM

I got my C&L MAF yesterday and got it in today. When everything was done and secure, I put the battery back in and fired her up. It was idling nice for a couple of seconds...right around 700 rpm, but then it would drop and almost stall. The rpm's didn't drop below 500 but the battery gauge was going wacky. At normal idle, it's one mark above halfway but when the car would drop rpm's, the volts would drop to a couple marks below halfway.

The idle was fine before the MAF and my new alternator was doing it's job wonderfully. Now the idle goes from 700 rpm then drops to 500 and almost stalls, then back up to 700, then back down. It's hard to describe...it sounds like I have a cam.

What could the problem be?? I never bumped my timing so I don't know what it's at. Other than that, I have no idea why the idle is surging. Any help is appreciated cause I'm stuck.

Hozer 88GTConv · 03-09-2002, 10:39 PM

Sounds like you have a MAF that is calibrated for the wrong sized injectors? Are yours stock? It should say on the side of the box what the sampling tube of the MAF is calibrated for with regards to the size of injectors. My 73mm C+L is calibrated for my 24 # injectors for instance.

Stang_Crazy · 03-10-2002, 03:20 PM

The MAF is calibrated for my stock 19lb injectors. The box stated that it was calibrated for 19lb and the MAF itself has a gold mark on it signifying that it was meant for 19lb injectors. Could it be anything else?

saywhenn94 · 03-10-2002, 08:01 PM

it could be possible that you got a bad maf. try putting your original maf back in your car and see if the problem continues. also did you do any other mod's at the same time?

Stang_Crazy · 03-10-2002, 08:50 PM

I didn't install anything else. Just the MAF. I put the pulleys and alternator on a few weeks ago and the car ran and idled fine. I'll try putting the old MAF back on to see if the problem is still there.

avbcon12 · 03-10-2002, 09:49 PM

you said that you have taken your battery off and then reconnected it. and the voltmeter was going crazy. could it be the connections on your battery to the cables arent good when you put it back on?

take care,
adam

03-09-2002, 05:10 PM	#1
Stang_Crazy It's never clean enough! Join Date: Jan 1999 Location: Shaler, PA Posts: 1,542	Surging Idle After MAF Install...HELP I got my C&L MAF yesterday and got it in today. When everything was done and secure, I put the battery back in and fired her up. It was idling nice for a couple of seconds...right around 700 rpm, but then it would drop and almost stall. The rpm's didn't drop below 500 but the battery gauge was going wacky. At normal idle, it's one mark above halfway but when the car would drop rpm's, the volts would drop to a couple marks below halfway. The idle was fine before the MAF and my new alternator was doing it's job wonderfully. Now the idle goes from 700 rpm then drops to 500 and almost stalls, then back up to 700, then back down. It's hard to describe...it sounds like I have a cam. What could the problem be?? I never bumped my timing so I don't know what it's at. Other than that, I have no idea why the idle is surging. Any help is appreciated cause I'm stuck. __________________ ~Dan 2001 SVT Lightning 89' GT : Taking up garage space and waiting for a buyer... Rice Hater's Club - Member #11

03-09-2002, 10:39 PM	#2
Hozer 88GTConv Registered Member Join Date: Feb 2002 Location: Jacksonville, FL Posts: 706	Calibrated? Sounds like you have a MAF that is calibrated for the wrong sized injectors? Are yours stock? It should say on the side of the box what the sampling tube of the MAF is calibrated for with regards to the size of injectors. My 73mm C+L is calibrated for my 24 # injectors for instance. __________________ 1988 GT Convertible 331 10:1 TW heads, GT-40 intake, MSD, TRW flattops, B Cam w/ 1.7's, MAC exhaust, 24's, 70 TB, 76 MAF, 3.73's, Pro 5.0, Koni's, Anderson PMS, Wideband 02, yatta, yatta... One week with new motor, two speeding tickets...joy

03-10-2002, 03:20 PM	#3
Stang_Crazy It's never clean enough! Join Date: Jan 1999 Location: Shaler, PA Posts: 1,542	calibrated for 19lb The MAF is calibrated for my stock 19lb injectors. The box stated that it was calibrated for 19lb and the MAF itself has a gold mark on it signifying that it was meant for 19lb injectors. Could it be anything else? __________________ ~Dan 2001 SVT Lightning 89' GT : Taking up garage space and waiting for a buyer... Rice Hater's Club - Member #11

03-10-2002, 08:01 PM	#4
saywhenn94 Registered Member Join Date: Feb 2002 Location: Warren, Mi. Posts: 50	bad part? it could be possible that you got a bad maf. try putting your original maf back in your car and see if the problem continues. also did you do any other mod's at the same time? __________________ 91 GT Convertable, 306, TFS TW heads, B41 cam, Holley Systemax, S-Trim, Bassani LT's, and Flo's

03-10-2002, 08:50 PM	#5
Stang_Crazy It's never clean enough! Join Date: Jan 1999 Location: Shaler, PA Posts: 1,542	nothing else installed I didn't install anything else. Just the MAF. I put the pulleys and alternator on a few weeks ago and the car ran and idled fine. I'll try putting the old MAF back on to see if the problem is still there. __________________ ~Dan 2001 SVT Lightning 89' GT : Taking up garage space and waiting for a buyer... Rice Hater's Club - Member #11

03-10-2002, 09:49 PM	#6
avbcon12 Registered Member Join Date: Jul 2001 Location: West Bloomfield, MI Posts: 391	you said that you have taken your battery off and then reconnected it. and the voltmeter was going crazy. could it be the connections on your battery to the cables arent good when you put it back on? take care, adam __________________ 90 GT black/ grey leather ported GT-40 heads w/ 1.7RR, Cobra intake w/ ported lower, 24# injectors, 190LPH pump, 75mm Pro-M MAF, 65mm TB, K&N panel, BBK long tubes, Off road H-pipe, 2 ch. Flowmaster, Black magic fan, Kirban FPR, 180 deg. T-stat, 3.73's, Steeda Tri-Ax, 130 amp alt. Accell 8.8 race wires/cap/rotor, motorcraft plugs, Factory Five suspension, etc etc etc.... http://avbcon12.stangnet.com

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