low rpm miss

mxnate116 · April 30th, 2008, 02:46 PM

so i have about 330 miles on my 88gt rebuild

if i lug the motor along it usually misses a few times then it seems like it hits the powerband and takes off. it only does this at low rpms i havnt gone past half throttle yet so i dont know how it is on top end.

i also set the cam 4deg advanced and have the timing at 13-14 deg and it pops and backfires occasionally should i have my timing at 10deg or what?

i have new plugs in it with msd wires, no air pump or smog(if that makes any diff) the cap and rotor are pretty new, stock coil

i know i need new o2 sensors could this be the cause?

also its just drinkin gas. i got about 100 miles on half a tank without ever going past 3k rpms.

MIGHTYJO3YOUNG · April 30th, 2008, 07:03 PM

having bad o2 sensors will deff eat ur gas up

93hatch · April 30th, 2008, 07:16 PM

gas mileage sounds pretty average to me

93hatch · April 30th, 2008, 07:24 PM

and did you put the little plastic caps back on the injectors? my old ones didnt have them and did that

Bigfatts · April 30th, 2008, 10:33 PM

I had a similar problem with me 331 powered LX, just got it fixed. I did new wires, cap/rotor, plugs, coil. Turned out to be the distributor. Lots of people rebuild engines, almost no one rebuilds distributors. Got the old one out and it was just a rattle trap about to come apart. $59 later and a reman distributor from Advanced and I now have my timing 11* advanced (the way the distributor was it threw off the timing, took alot of fiddling to get it right) and it runs like it's old self.

mxnate116 · April 30th, 2008, 10:47 PM

yeah i didnt put new caps on the injectors just new o-rings.

and i wanted to rebuild the distributor cause i thought it seemed a little loose. i think ill do that now and get a msd coil.

now that i think about it that seems perfect cause my car hasnt seemed consistent in the way its driven since the rebuild.

mxnate116 · April 30th, 2008, 10:48 PM

also could the TFI module have anything do to with it?

86gtconvert · May 7th, 2008, 01:16 PM

what cam ya have and tranny,any stall, could be timing..to many variables..what did ya have done to your motor

Speedstang302 · May 7th, 2008, 03:43 PM

yeah what cam are you doing..really with anything less than the f303 cam i would just do 10-12*....f cam and up should be set 13/14*+

mxnate116 · May 7th, 2008, 06:28 PM

5speed
stock cam
mild port job on the intake
msd wires
catless h pipe
NO mass air
bored .020 over

it doesnt seem to be doing it as much but it still happens occasionally

chase · May 7th, 2008, 08:38 PM

I had a similar problem. It turned out to be my EGR valve. It was stuck open.

Vamp89 · May 7th, 2008, 11:36 PM

Mine also pops at low rpm's dunno why and just put new o2's on and it got better but it's still there.

April 30th, 2008, 02:46 PM	#1
mxnate116 Hardcore Enthusiast SVTfocus, F250 Join Date: Jun 2007 Location: Spokane, WA Posts: 2,971 iTrader: 1 reviews	low rpm miss so i have about 330 miles on my 88gt rebuild if i lug the motor along it usually misses a few times then it seems like it hits the powerband and takes off. it only does this at low rpms i havnt gone past half throttle yet so i dont know how it is on top end. i also set the cam 4deg advanced and have the timing at 13-14 deg and it pops and backfires occasionally should i have my timing at 10deg or what? i have new plugs in it with msd wires, no air pump or smog(if that makes any diff) the cap and rotor are pretty new, stock coil i know i need new o2 sensors could this be the cause? also its just drinkin gas. i got about 100 miles on half a tank without ever going past 3k rpms.

April 30th, 2008, 07:16 PM	#3
93hatch Banned 1992 Lx 11.39@119.24 Join Date: Jan 2008 Location: Az Posts: 11,644 iTrader: 0 reviews	gas mileage sounds pretty average to me __________________ [QUOTE=93mustank;2577445]We speed tested my right arm for quickness in shifts... So he could design the cam for proper shift recovery.[/QUOTE]

April 30th, 2008, 07:24 PM	#4
93hatch Banned 1992 Lx 11.39@119.24 Join Date: Jan 2008 Location: Az Posts: 11,644 iTrader: 0 reviews	and did you put the little plastic caps back on the injectors? my old ones didnt have them and did that __________________ [QUOTE=93mustank;2577445]We speed tested my right arm for quickness in shifts... So he could design the cam for proper shift recovery.[/QUOTE]

May 7th, 2008, 03:43 PM	#9
Speedstang302 I Post Entirely Way Too Much 1996 Mustang GT 13.64@101mph Join Date: Apr 2007 Location: Massachusetss Posts: 5,828 iTrader: 1 reviews	yeah what cam are you doing..really with anything less than the f303 cam i would just do 10-12....f cam and up should be set 13/14+ __________________ 1990 GT- GT40p Heads\| Anderson N41 cam\| Crane 1.6 RR's\| Trickflow Intake\|MGW Short Throw\| Aluminum d/s\| 3.73's.....still slow....

May 7th, 2008, 08:38 PM	#11
chase Regular 1987 Mustang LX Join Date: Dec 2006 Location: Cherry Point NC Posts: 58 iTrader: 0 reviews	I had a similar problem. It turned out to be my EGR valve. It was stuck open. __________________ 1987 LX 5spd 306 F cam 3.55 gears slicked plus all the bolt on's

April 30th, 2008, 07:03 PM	#2
MIGHTYJO3YOUNG Enthusiast 1992 mustang Lx 13.4@ 106 Join Date: Dec 2006 Location: MD Posts: 569 iTrader: 0 reviews	having bad o2 sensors will deff eat ur gas up

April 30th, 2008, 10:33 PM	#5
Bigfatts Regular Badass Mother 3000 Twice as fast as your ass! Join Date: Apr 2008 Location: Lutz, Florida Posts: 234 iTrader: 1 reviews	I had a similar problem with me 331 powered LX, just got it fixed. I did new wires, cap/rotor, plugs, coil. Turned out to be the distributor. Lots of people rebuild engines, almost no one rebuilds distributors. Got the old one out and it was just a rattle trap about to come apart. $59 later and a reman distributor from Advanced and I now have my timing 11* advanced (the way the distributor was it threw off the timing, took alot of fiddling to get it right) and it runs like it's old self.

April 30th, 2008, 10:47 PM	#6
mxnate116 Hardcore Enthusiast SVTfocus, F250 Join Date: Jun 2007 Location: Spokane, WA Posts: 2,971 iTrader: 1 reviews	yeah i didnt put new caps on the injectors just new o-rings. and i wanted to rebuild the distributor cause i thought it seemed a little loose. i think ill do that now and get a msd coil. now that i think about it that seems perfect cause my car hasnt seemed consistent in the way its driven since the rebuild.

April 30th, 2008, 10:48 PM	#7
mxnate116 Hardcore Enthusiast SVTfocus, F250 Join Date: Jun 2007 Location: Spokane, WA Posts: 2,971 iTrader: 1 reviews	also could the TFI module have anything do to with it?

May 7th, 2008, 01:16 PM	#8
86gtconvert Regular 1986 mustang gt convert Join Date: Apr 2008 Location: wyoming Posts: 72 iTrader: 0 reviews	what cam ya have and tranny,any stall, could be timing..to many variables..what did ya have done to your motor

May 7th, 2008, 06:28 PM	#10
mxnate116 Hardcore Enthusiast SVTfocus, F250 Join Date: Jun 2007 Location: Spokane, WA Posts: 2,971 iTrader: 1 reviews	5speed stock cam mild port job on the intake msd wires catless h pipe NO mass air bored .020 over it doesnt seem to be doing it as much but it still happens occasionally

May 7th, 2008, 11:36 PM	#12
Vamp89 Regular 1989 Mustang GT Join Date: May 2006 Location: Indiana Posts: 194 iTrader: 0 reviews	Mine also pops at low rpm's dunno why and just put new o2's on and it got better but it's still there. __________________ Ported Saleen Vortech Intake BBK 70mm t/b,BBK CAI,BBK Reg,BBK 255 Fuel Pump Hooker Super Comp Long-tube Headers Fcam Ported Motorsport J302 Heads 30# Injectors 1.6rr 80mm Mass Air 4:11 gears

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