Hanging idle

bottlebaby91 · 04-28-2003, 11:53 PM

Since a took the motor out, put all new gaskets in, got heads ported and polished and back together, the car does not want to come down to a good idle. I have adjusted the tps, adjusted fp, reset computer, checked for codes and came up o2 sensor lean bank 1 and 2. It is not running lean, it is running rich, the o2's says lean which makes the computer make the car run rich. I have spent numorous hours searching for vacuum leaks and cant find any. The last time i adjusted fp, when i took off the vacuum line for the regulator, some gas piddle out. Should this be happenig? The idle comes down to about 1600, than runs down to 1200 and than down to the proper idle. I have adjusted timing, tried "clocking" the maf w/ no luck. When the motor is cold it comes down to idle w/o a problem. I dont know what to do. Any comments/suggestions are thankful. Sorry so long, but kinda needed to let everyone know what i have tried already.

LIST OF MODS: Engine: 5 liter

-Transmission: T-5 with Ram Powergrip Clutch

-Engine mods: bored .030 with Arias 10:1 Pistons, ARP main cap bolts, ARP head bolts, Edelbrock gear drive, Moroso 7qt oilpan

-camshaft: 286/294 duration @ .050 lift ???? forgot

-heads: Trick Flow Twisted Wedge 2.02/1.60 valves, 7/16" rocker studs w/ guide plates, Crane aluminum roller rockers, ported and polished

-intake: Edelbrock Performer RPM EFI with 70mm throttle body, 30lb injectors, 80mm C&L Mass Air

-Exhaust: 1 5/8 full length headers, H-pipe, flowmaster 2 1/2 exhaust

-Gears: 4.10:1

-Misc.: 3-row radiator, underdrive pulleys, electric fan, Hurst Shifter, Autometer Gauges, Lakewood Bellhousing, SVO Aluminmum Driveshaft, 255lph intake fuel pump, 80psi inline pump

RPM427 · 04-29-2003, 01:45 AM

Seems like you have a bad FP regulator. Gas should NOT be coming out of the vacum port.

Replace your FPR and that will probably cure your problem. If the intake is sucking gas from the regulator (since its coming out of the vacuum port), then it is also probably the source of the vacuum leak.

ChunkFunky · 04-29-2003, 06:06 AM

I would also guess if you're sucking fuel into the intake through that FPR that would cause you to run rich as well... though i can imagine it's sucking in THAT much fuel... who knows..
-as

bottlebaby91 · 04-29-2003, 08:27 AM

Thanks for the replies, i just ordered a new aeromotive fpr so i will see if that helps.

bottlebaby91 · 04-30-2003, 11:28 PM

New fpr in, idles like a dream, when it cold. As soon as it warms up, idle get messed up ans is doing what it used to. What should i look at now?

drtbiker · 04-30-2003, 11:45 PM

what fuel pressure are u running at?
later

bottlebaby91 · 04-30-2003, 11:53 PM

35 w/vacuum line off
ive tried different places without much luck

93GTDIN · 05-01-2003, 12:35 AM

this is just a guess, but do you have Flowtech full length headers and H-Pipe?

bottlebaby91 · 05-01-2003, 06:19 PM

bbk full length and h pipe

93GTDIN · 05-01-2003, 08:11 PM

I dont know how the BBK's are set up, but if the 02 sensor is only on one runner, it needs to be moved down to the collector ala a muffler shop.

bottlebaby91 · 05-01-2003, 10:25 PM

I could look into that, but the thing that is confusing is that the motor ran just fine before it came out, and now it just has an idle problem.

bottlebaby91 · 05-03-2003, 11:27 AM

any help, anyone???

04-28-2003, 11:53 PM	#1
bottlebaby91 Registered Member Join Date: Nov 2002 Posts: 141	Hanging idle Since a took the motor out, put all new gaskets in, got heads ported and polished and back together, the car does not want to come down to a good idle. I have adjusted the tps, adjusted fp, reset computer, checked for codes and came up o2 sensor lean bank 1 and 2. It is not running lean, it is running rich, the o2's says lean which makes the computer make the car run rich. I have spent numorous hours searching for vacuum leaks and cant find any. The last time i adjusted fp, when i took off the vacuum line for the regulator, some gas piddle out. Should this be happenig? The idle comes down to about 1600, than runs down to 1200 and than down to the proper idle. I have adjusted timing, tried "clocking" the maf w/ no luck. When the motor is cold it comes down to idle w/o a problem. I dont know what to do. Any comments/suggestions are thankful. Sorry so long, but kinda needed to let everyone know what i have tried already. LIST OF MODS: Engine: 5 liter -Transmission: T-5 with Ram Powergrip Clutch -Engine mods: bored .030 with Arias 10:1 Pistons, ARP main cap bolts, ARP head bolts, Edelbrock gear drive, Moroso 7qt oilpan -camshaft: 286/294 duration @ .050 lift ???? forgot -heads: Trick Flow Twisted Wedge 2.02/1.60 valves, 7/16" rocker studs w/ guide plates, Crane aluminum roller rockers, ported and polished -intake: Edelbrock Performer RPM EFI with 70mm throttle body, 30lb injectors, 80mm C&L Mass Air -Exhaust: 1 5/8 full length headers, H-pipe, flowmaster 2 1/2 exhaust -Gears: 4.10:1 -Misc.: 3-row radiator, underdrive pulleys, electric fan, Hurst Shifter, Autometer Gauges, Lakewood Bellhousing, SVO Aluminmum Driveshaft, 255lph intake fuel pump, 80psi inline pump

04-29-2003, 01:45 AM	#2
RPM427 Registered Member Join Date: Aug 2001 Location: Huntington NY Posts: 573	Seems like you have a bad FP regulator. Gas should NOT be coming out of the vacum port. Replace your FPR and that will probably cure your problem. If the intake is sucking gas from the regulator (since its coming out of the vacuum port), then it is also probably the source of the vacuum leak. __________________ -1993 Mustang, 900rwhp 03-04 cobra based 4v swap, full Griggs setup, project underway -1994 Ranger w/ 427cid windsor (daily beater) check it out!

04-29-2003, 06:06 AM	#3
ChunkFunky Registered Member Join Date: Apr 2002 Location: Tustin, CA Posts: 465	I would also guess if you're sucking fuel into the intake through that FPR that would cause you to run rich as well... though i can imagine it's sucking in THAT much fuel... who knows.. -as __________________ '89 GT Convertible: TFS TW Heads, TFS Street Intake, TFS Stage 1 Cam, FMS 1.6 RRs, 24# Injectors, Pro-M 75mm MAF, No Name CAI, 3.73s, O/R H-Pipe, FlowMasters, AOD w/ Trans-Go Shift Kit

04-30-2003, 11:45 PM	#6
drtbiker Registered Member Join Date: Jan 2002 Location: Mt. Prospect,IL Posts: 474	what fuel pressure are u running at? later __________________ 87-ford-mustang-SOLD! mods: 3:73's, off road h-pipe, b303 cam in gt- 40 motor w/ Power Plus intake, edelbrock 70mm tb & egr spacer, 72mm C&L, bbk long tubes, tremec tranny, centerforce dual friction clutch, upr and lwr CA's 255lph FP and soon more to come.... when i have money again SOME ADVICE Don't do burn outs in reverse it is very expensive New times with dead hook on dr's 13.27@103 with 2.0 60 foots w/100lb system Fastest time to date: 12.8@113

05-01-2003, 12:35 AM	#8
93GTDIN Registered Member Join Date: Jan 2001 Location: Live music capital of the world, TX Posts: 324	this is just a guess, but do you have Flowtech full length headers and H-Pipe? __________________ 96 Cobra - a bit too stock. 14.0 @ 101

04-29-2003, 08:27 AM	#4
bottlebaby91 Registered Member Join Date: Nov 2002 Posts: 141	Thanks for the replies, i just ordered a new aeromotive fpr so i will see if that helps.

04-30-2003, 11:28 PM	#5
bottlebaby91 Registered Member Join Date: Nov 2002 Posts: 141	New fpr in, idles like a dream, when it cold. As soon as it warms up, idle get messed up ans is doing what it used to. What should i look at now?

04-30-2003, 11:53 PM	#7
bottlebaby91 Registered Member Join Date: Nov 2002 Posts: 141	35 w/vacuum line off ive tried different places without much luck

05-01-2003, 06:19 PM	#9
bottlebaby91 Registered Member Join Date: Nov 2002 Posts: 141	bbk full length and h pipe

05-01-2003, 08:11 PM	#10
93GTDIN Registered Member Join Date: Jan 2001 Location: Live music capital of the world, TX Posts: 324	I dont know how the BBK's are set up, but if the 02 sensor is only on one runner, it needs to be moved down to the collector ala a muffler shop. __________________ 96 Cobra - a bit too stock. 14.0 @ 101

05-01-2003, 10:25 PM	#11
bottlebaby91 Registered Member Join Date: Nov 2002 Posts: 141	I could look into that, but the thing that is confusing is that the motor ran just fine before it came out, and now it just has an idle problem.

05-03-2003, 11:27 AM	#12
bottlebaby91 Registered Member Join Date: Nov 2002 Posts: 141	any help, anyone???

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