this car really sucks

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hi_po_heads

New Member

Jan 13, 2003

117

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0

paragould arkansas

Jan 9, 2004

#1

• Jan 9, 2004

• #1

i just bought an 89 gt. when i got it, it popped at high rpm's. the motor is stock. i changed the cam, distributor, dist. module, header gaskets, computer, intake, o2 sensors, tps, iac, fuel filter and reg., and still when you push the pedal to the floor it wont rev past 3000 rpm. then when you let off it pops and backfires. it is flooding a little but not bad. it also has a c4 with a9p comp. does anyone have any clues here. thanks

 

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hi_po_heads

New Member

Jan 13, 2003

117

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0

paragould arkansas

Jan 9, 2004

#2

• Jan 9, 2004

• #2

sorry i forgot, i also raplaced the injectors, coil, plug wires, plugs, mass air meter and map sensor.

 

drgn5.0

Founding Member

Mar 13, 2001

603

0

0

Jan 9, 2004

#3

• Jan 9, 2004

• #3

i suspect your fuel pump is bad due to how it is acting.

 

8

89 Saleen#455

Founding Member

Dec 29, 1999

519

5

39

New England

Jan 9, 2004

#4

• Jan 9, 2004

• #4

Fuel pump was my first thought as well.

 

mustang90

Founding Member

Feb 8, 2001

1,209

15

58

Jan 9, 2004

#5

• Jan 9, 2004

• #5

Definetly change your fuel pump! Go with a bbk 255lph pump and that should cure the problem. Sounds like fuel starvation!

 

BlackGT89

Member

Dec 16, 2002

774

8

18

Huntsville, AL

Jan 9, 2004

#6

• Jan 9, 2004

• #6

Another vote for fuel pump. Also check your in line fuel filter and the fuel pressure regulator . Might want to consider an adjustable model with a pressure gauge to adjust with.

 

mustang90

Founding Member

Feb 8, 2001

1,209

15

58

Jan 9, 2004

#7

• Jan 9, 2004

• #7

right on blackgt89!

 

gaslight

Founding Member

Jul 12, 2000

3,364

15

99

Maine

Jan 9, 2004

#8

• Jan 9, 2004

• #8

get a fuel pressure gauge that you can mount inside to keep a eye on what might be happening. A adjustable fuel pressure regulator might be something to consider in the future.
Was it doing any of that before you started replacing parts? If not then you might consider that something was installed incorrectly. I would take a close look to see if the distributor was put back correctly.

 

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hi_po_heads

New Member

Jan 13, 2003

117

0

0

paragould arkansas

Jan 9, 2004

#9

• Jan 9, 2004

• #9

it has an adjustable fpr and a gauge, the pressure stays the same all the time. i thought since the pressure stayed good that would kick the pump idea but maybe that is it. thanks

 

1

1BAD89GT

New Member

Jan 2, 2004

87

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0

Oklahoma

Jan 9, 2004

#10

• Jan 9, 2004

• #10

Sounds like an Ignition problem to me Do you have any type of after market
ignition on the Car or has anything been rewired?

 

BlackGT89

Member

Dec 16, 2002

774

8

18

Huntsville, AL

Jan 9, 2004

#11

• Jan 9, 2004

• #11

Hi-po, you may have more than one problem. Possibly fuel / ignition or something else entirely. Pull the vacuum hose off of the FPR and see if gas runs out. If the diaphram has ruptured internally this would account for your rich condition. Could the valves be floating at higher RPM's ? How good are the valve springs and valve train components ? What about the timing chain ? Slack can make them run really lazy - until it it finally stops.

 

LXMiker

Founding Member

Feb 7, 2002

159

0

0

Good ol' Wisconsin

Jan 9, 2004

#12

• Jan 9, 2004

• #12

what pressure is the fuel at??
is the firing order right?? or is the distributor a tooth off??
this sounds dumb but.......
does it have cats on it??? i have seen cars with plugged cats not rev up a lot.....
but if it still is missing an backfiring that aint it

 

ashford

Member

Dec 19, 2003

485

0

16

fargo ND

Jan 9, 2004

#13

• Jan 9, 2004

• #13

a few loose thoughts..... air filter??? - had a really plugged one on a friends car didnt get past 3500 rpm in or out of gear.

neutral safety switch might be that the comp thinks its in neutral and is limiting it, but i dont think fords do that chevys do.


use a timing light and rev the crap out of it see if the light dosnt skip a beat or 5 or 10.if its smooth you prob lies in fuel or air or computer

 

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hi_po_heads

New Member

Jan 13, 2003

117

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0

paragould arkansas

Jan 10, 2004

#14

• Jan 10, 2004

• #14

i did get gas at the fpr hose. what does that mean again and what does it do? it has no cats, the timing chain is good, the distibutor is right on, ive tried putting on an msd box but that didnt help either. thanks for all the help.

 

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hi_po_heads

New Member

Jan 13, 2003

117

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0

paragould arkansas

Jan 10, 2004

#15

• Jan 10, 2004

• #15

o yea i also tried pulling off the air filter, that didn't make a difference. and the valvetrain seems to be in good shape. the firing order is 13726548. i believe that is what the h.o should be. the guy that i got it from ripped the steering column out but all the wires looked to be in good shape. im not sure if the steering column wires have anything to do with the way it runs though.

 

mustang90

Founding Member

Feb 8, 2001

1,209

15

58

Jan 10, 2004

#16

• Jan 10, 2004

• #16

Hows your throttle position sensor? Also, are the injectors or mass air meter upgraded?

 

JadeFalcon

Founding Member

Mar 28, 2002

1,924

0

0

Arlington, TX

Jan 10, 2004

#17

• Jan 10, 2004

• #17

hi_po_heads said:

i did get gas at the fpr hose. what does that mean again and what does it do? it has no cats, the timing chain is good, the distibutor is right on, ive tried putting on an msd box but that didnt help either. thanks for all the help.

Click to expand...

theres 3 things that keep a car from revving up. ignition, fuel, or exhaust restriction (clogged cats).

 

BlackGT89

Member

Dec 16, 2002

774

8

18

Huntsville, AL

Jan 10, 2004

#18

• Jan 10, 2004

• #18

Hi-po, if you're getting gas in the vaccum line coming from your adjustable fuel pressure regulator it means your regulator is shot and has an internal leak sucking gas pst the diaphram. I've heard of a rash of bad ones. Replace it with a new one.

 

IndyBlk5.0

New Member

Nov 24, 2003

1,122

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0

New Whiteland, IN

Jan 10, 2004

#19

• Jan 10, 2004

• #19

fuel pressure problem/ timing problem.... this could both be it...

 

IndyBlk5.0

New Member

Nov 24, 2003

1,122

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0

New Whiteland, IN

Jan 10, 2004

#20

• Jan 10, 2004

• #20

secondly, what intake and heads are you running... with a combo, they call for certain fuel pressure levels.... with 24 pound injectors for a basic setup i would start at 36-38 psi... See if this helps. my car wouldnt rev and would backfire when timing was off, double check it...