too rich

chrgnu · 08-14-2005, 02:02 PM

I have a '87 mustang that I converted to a '90 for the mass air. my parts list consists of 255 lph pump, 12psi procharger, bbk fuel regulator, and 30 lbs injectors with mass air meter. My problem is my idle goes up to 1800 than down to 400 rpms. sometimes it will idle at 800 rpms but I cant make it do it, it does this when it wants. I think it is running to rich but I cant turn the fuel down under 29 lbs at idle. Can someone help me,

buddha · 08-16-2005, 04:48 PM

Did you reset the idle when you added all these parts? You should be able to run the stock FP....about 38-40 psi.

84gt347 · 08-16-2005, 04:54 PM

my blower cars would surge when they were lean..

my na cars would surge when lean.

my money goes on lean.

they smelled like they were rich, but it weren't so. fatten that sucka

Teamasus17 · 10-04-2005, 09:55 AM

Quote:

Originally Posted by 84gt347

my blower cars would surge when they were lean..

my na cars would surge when lean.

my money goes on lean.

they smelled like they were rich, but it weren't so. fatten that sucka

Rich / Lean Thats here nor there. If its a mass air car, you should have a TPS and IAC Sensor/Motor. Did you set the TPS module?? Check for a leak around the Idle Air Control, or a vacuum leak somewhere in the system. That usually causes the symptoms you are seeing.

Also check to see the MAF is sealed, and no air is leaking around the air intake tract, that will also produce a surge, and whacky idle.

I once had the MAF screen gasket leak on mine and it would do the same as your car, but mine was so bad it would die after idling about 2 minutes.

Jeff Chambers · 10-04-2005, 12:26 PM

Set the TB at 0.010" + 1 full turn.
Verify that the TPS is near but not over 1-volt.
Beyond this, you could try adding the IAC bleed plate or even better yet have a tuner look at the problem. Most likely, if your tuner could add some ISC nuetral idle air to your tune it would solve the problem. Idle is the most difficult part of tuning, but once it's solved the driveability is much improved.

Teamasus17 · 10-04-2005, 12:54 PM

Quote:

Originally Posted by Jeff Chambers

Set the TB at 0.010" + 1 full turn.
Verify that the TPS is near but not over 1-volt.
Beyond this, you could try adding the IAC bleed plate or even better yet have a tuner look at the problem. Most likely, if your tuner could add some ISC nuetral idle air to your tune it would solve the problem. Idle is the most difficult part of tuning, but once it's solved the driveability is much improved.

Amen, I agree.

08-14-2005, 02:02 PM	#1
chrgnu Registered Member Join Date: Aug 2005 Posts: 1	too rich I have a '87 mustang that I converted to a '90 for the mass air. my parts list consists of 255 lph pump, 12psi procharger, bbk fuel regulator, and 30 lbs injectors with mass air meter. My problem is my idle goes up to 1800 than down to 400 rpms. sometimes it will idle at 800 rpms but I cant make it do it, it does this when it wants. I think it is running to rich but I cant turn the fuel down under 29 lbs at idle. Can someone help me,

08-16-2005, 04:48 PM	#2
buddha Registered Member Join Date: Feb 2000 Location: Washington, MO Posts: 327	Re: too rich Did you reset the idle when you added all these parts? You should be able to run the stock FP....about 38-40 psi. __________________ 93' Cobra with a cogged NOVI 2k, R331

08-16-2005, 04:54 PM	#3
84gt347 Registered Member Join Date: Mar 2002 Location: sherwood Forest Posts: 291	Re: too rich my blower cars would surge when they were lean.. my na cars would surge when lean. my money goes on lean. they smelled like they were rich, but it weren't so. fatten that sucka __________________ 84 gt350 89 lx vert 92 lincoln lsc. All Forced ( one way or another)

10-04-2005, 12:26 PM	#5
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	Re: too rich Set the TB at 0.010" + 1 full turn. Verify that the TPS is near but not over 1-volt. Beyond this, you could try adding the IAC bleed plate or even better yet have a tuner look at the problem. Most likely, if your tuner could add some ISC nuetral idle air to your tune it would solve the problem. Idle is the most difficult part of tuning, but once it's solved the driveability is much improved. __________________ Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!"

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