Installed BD11 powerdyne, runs like trash... help!

1993SSP

Founding Member

Sep 5, 2001

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37

Ky

Jul 29, 2005

#1

• Jul 29, 2005

• #1

It's installed exactly per instructions. Im running my stock gap plugs, fuel pressure at 38 warm idle, sometimes it runs decent then other times it runs like crap! Any ideas what would make it run ok then change to running like garbage?

 

Paul Perreca

New Member

Mar 30, 2005

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Jul 29, 2005

#2

• Jul 29, 2005

• #2

could be vaccum line knocked off, and there is a little cylinder type thing, cant remember what its called, that is attached to the arm of the intake, (maybe the throttle body, havent looked in a long time) Take that cylinder off (two bolts i think, easy) and unplug it (it has a plug in it) and clean it out w/ carb cleaner, and also maybe your throttle body plate may be dirty and sticking from whatever - but my IAC i think it is, Idle Air Control, when I messed w/ throttle body or the induction, it ended up being clogged and i had to carb clean it, and it ran fine after that.... start there, and listen to these gurus here cuz they'll have your problem solved in no time if I havent....
Paul Perreca

 

QDRHRSE

New Member

Dec 31, 2002

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Palmdale, CA

Jul 29, 2005

#3

• Jul 29, 2005

• #3

Does the car idle funny? Fast? What does the car do when it runs like crap? Do you have vacuum?

 

Nutzy19

Member

Mar 30, 2005

120

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Flemington NJ

Jul 29, 2005

#4

• Jul 29, 2005

• #4

Paul Perreca said:

could be vaccum line knocked off, and there is a little cylinder type thing, cant remember what its called, that is attached to the arm of the intake, (maybe the throttle body, havent looked in a long time) Take that cylinder off (two bolts i think, easy) and unplug it (it has a plug in it) and clean it out w/ carb cleaner, and also maybe your throttle body plate may be dirty and sticking from whatever - but my IAC i think it is, Idle Air Control, when I messed w/ throttle body or the induction, it ended up being clogged and i had to carb clean it, and it ran fine after that.... start there, and listen to these gurus here cuz they'll have your problem solved in no time if I havent....
Paul Perreca

Click to expand...

WHAT??!?!?!?

 

QDRHRSE

New Member

Dec 31, 2002

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Palmdale, CA

Jul 29, 2005

#5

• Jul 29, 2005

• #5

I got what he was saying. He figured it out in his post. He was talking about the IAC.

 

1993SSP

Founding Member

Sep 5, 2001

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Ky

Jul 30, 2005

#6

• Jul 30, 2005

• #6

Im going to double check all my vacuum line, but the car starts and idles fine, when sitting parked the enging rev's great, but when i take off and got from 1st to 2nd it will sputter and backfire thru the exhaust, then it will smooth out but it gets some kinda hesitation around 5200 rpm (stock tach)

 

1993SSP

Founding Member

Sep 5, 2001

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Jul 31, 2005

#7

• Jul 31, 2005

• #7

ok guys, I double checked it all. Could this problem be caused by a faulty mass air meter? I have a pro-m, I had a small engine missing problem before only when it was cold, But now it seems the problem has gotten 10 times worse, could it be the faster air being drawn thru the meter causing me the problems?

 

S

Scorcher2005

Member

Apr 17, 2004

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South Carolina

Jul 31, 2005

#8

• Jul 31, 2005

• #8

if the MAF is bad, it usually idles pretty crappy and if its pretty messed up, it doesnt calibrate right for how much air is moving through it. I dont know why it would run fine sometimes though, and bad others.

 

1993SSP

Founding Member

Sep 5, 2001

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Ky

Jul 31, 2005

#9

• Jul 31, 2005

• #9

I dont know, The car has 24lb injectors from a 99 cobra in it, Im thinking maybe my harness has a short in it where the newer model connectors were put in, Im gonna get a new harness off ebay and install the 24lb injectors i have that will plug into that and not have any splices at all. Maybe thats all that it is, it could have some injectors shutting down during driving which would explain why it's fine at idle

 

D

Daggar

New Member

Jul 19, 2004

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Jul 31, 2005

#10

• Jul 31, 2005

• #10

It sounds to me like you're blowing your plugs out. Regap them to .035 and let us know what happens.

 

S

Scorcher2005

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Apr 17, 2004

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South Carolina

Jul 31, 2005

#11

• Jul 31, 2005

• #11

do you have the right MAF for the 24# injectors?

 

J

jeffs89gt

New Member

Jul 18, 2005

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0

Jul 31, 2005

#12

• Jul 31, 2005

• #12

i dont think its vacume because if it was the problem would go away at higher rpms. sounds like fule or spark. idk what ur timing should be at but maby thats off.... is hte mass air for 24lb injectors, if not theres ur problem. are any of the wires crossed?its probly somethin stupid like that.

 

1993SSP

Founding Member

Sep 5, 2001

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Jul 31, 2005

#13

• Jul 31, 2005

• #13

i'll try gapping the plugs, im gonna pick up some new ones, I bought the MAF used, says 24lb on it, It's got to be a wiring problem or the air/fuel mixture is outta wack, thats what got me to thinking about the MAF ,what should I have my pressure set at with this charger? 38 lbs ok?

 

S

Scorcher2005

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Apr 17, 2004

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South Carolina

Jul 31, 2005

#14

• Jul 31, 2005

• #14

i think you need more than 38 psi w/ the s/c...seing as how around 40 is stock. I would raise it to about 45 and go from there.

 

1993SSP

Founding Member

Sep 5, 2001

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Ky

Aug 1, 2005

#15

• Aug 1, 2005

• #15

thanks, i'll bump it up when i replace the injector harness and injectors along with regapping the plugs

 

BLOWN 5.0 FOX

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Apr 4, 2005

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NORTH SHORE MA

Aug 2, 2005

#16

• Aug 2, 2005

• #16

If you have the money - opt for a tweecer or similar tuning program. ALOT can be done with AF ratio and diagnosing engine conditions.

 

1993SSP

Founding Member

Sep 5, 2001

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Ky

Aug 2, 2005

#17

• Aug 2, 2005

• #17

I wasnt wanting to get this lined out best as possible and take it for a dynotune

 

GREG91GT

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Jun 3, 2004

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MISSOURI

Aug 2, 2005

#18

• Aug 2, 2005

• #18

Do you have a FMU hooked up.

 

1993SSP

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Ky

Aug 3, 2005

#19

• Aug 3, 2005

• #19

yes, the FMU is installed

 

tunedin302

I AM the law!!!

Jul 29, 2004

1,251

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36

Pennsylvania

Aug 3, 2005

#20

• Aug 3, 2005

• #20

Is your MAF for a supercharger? If it is for a NA engine then that is your problem.