Need help with fuel problem.

JDW 88 · 05-04-2003, 04:00 PM

I have purchased what appeared to be mainly stock 88 5.0 5 speed coupe last October. The car is still speed density and has the following mods on it

Underdrives
K & N in box filter
Mac Shorties, Power Box and Pro Dumps
Taylor Custom fit 8mm wires

Parts replaced:
Map Sensor
Plugs
Oxygen Sensors

My problem #1,

I am flooding out at idle and backfiring badly. I have 55 lbs of fuel pressure at the rail at idle and a factory fuel regulator. Will it help to replace the regulator with an adjustable one to drop the pressure down. Where else should I look to fix this problem.

Problem # 2,
No check engine light a mechanic friend of mine said some cars will not run without the light being active any ideals on how to fix it?

drtbiker · 05-05-2003, 08:38 AM

First of all with a near to stock 5.0 you can run 38psi 50+ is way to much. To answer your second question on my 87 mustang i have the spot for the check engine light but it never turns on

later

tmoss · 05-05-2003, 12:23 PM

That fuel pressure is WAY too high and is probably the sole reason your running bad. Probably a fialed regulator - put a new one one and adjust to 38-40 as mentioned.

05-05-2003, 08:38 AM	#2
drtbiker Registered Member Join Date: Jan 2002 Location: Mt. Prospect,IL Posts: 474	First of all with a near to stock 5.0 you can run 38psi 50+ is way to much. To answer your second question on my 87 mustang i have the spot for the check engine light but it never turns on 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

05-05-2003, 12:23 PM	#3
tmoss Registered Member Join Date: Mar 2003 Location: Saint Louis, MO Posts: 634	That fuel pressure is WAY too high and is probably the sole reason your running bad. Probably a fialed regulator - put a new one one and adjust to 38-40 as mentioned. __________________ Tom (Torque) Moss 88Gt 5spd Vert, FLowmaster Catbacks, stock cam advanced 4° @ 108.5° ICL, NMRA prepped GT40P heads 1.85/1.55 valves and 1.7 rockers, MAC P headers Jet-Hot coated, 97 Exlporer intake (ported lower), TB and injectors. 277RWHP/330RWTQ (SAE). http://www.fastlanecars.com/

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05-04-2003, 04:00 PM	#1
JDW 88 Registered Member Join Date: May 2003 Location: Louisville, Ky Posts: 1	Need help with fuel problem. I have purchased what appeared to be mainly stock 88 5.0 5 speed coupe last October. The car is still speed density and has the following mods on it Underdrives K & N in box filter Mac Shorties, Power Box and Pro Dumps Taylor Custom fit 8mm wires Parts replaced: Map Sensor Plugs Oxygen Sensors My problem #1, I am flooding out at idle and backfiring badly. I have 55 lbs of fuel pressure at the rail at idle and a factory fuel regulator. Will it help to replace the regulator with an adjustable one to drop the pressure down. Where else should I look to fix this problem. Problem # 2, No check engine light a mechanic friend of mine said some cars will not run without the light being active any ideals on how to fix it?