Fuel Pressure/afr Probs

B

BeaterBeastGT

New Member

Feb 6, 2017

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#1

• Feb 6, 2017

• #1

I've got a '90 GT with cobra upper and lower intake, Pro-M MAF and CAI, 24# injectors, afr 185 heads, lunati cam, BBK long tubes, and recently put on a adjustable fuel pressure regulator, before the regulator swap it would buck and kick at part throttle when just cruising and smelled rich (or exhaust leak), but I was wondering of what would be the best fuel pressure to adjust it too with the vacuum off, and if it'd also help the AFR a little bit.
Thanks,
"BBGT"

 

General karthief

wonder how much it would cost to ship you a pair

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polk county florida

Feb 6, 2017

#2

• Feb 6, 2017

• #2

What are the fp now bot vac on and off?

 

B

BeaterBeastGT

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Feb 6, 2017

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#3

• Feb 6, 2017

• #3

Haven't checked yet, I got the car last Sunday and drove it back home, next thing I know the starter won't engage properly so I've gotta shim it but I can check tomorrow.

 

General karthief

wonder how much it would cost to ship you a pair

5 Year Member

Aug 25, 2016

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polk county florida

Feb 6, 2017

#4

• Feb 6, 2017

• #4

Never heard of having to shim a ford starter, at least not on stock stuff,

 

Jason 302

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Aug 9, 2003

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Newark, Ohio

Feb 6, 2017

#5

• Feb 6, 2017

• #5

I usually ran 38-40 psi with the vacuum line off.

 

a91what

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Feb 7, 2017

#6

• Feb 7, 2017

• #6

Stock is 39 with vacuum off.

If you have to adjust the fuel pressure to get it right then the MAF is either wrong for the injectors or calibration is off.

Most pro m maf are meant to have the filter right on the end of them, where do you have the filter located? If it's just hanging out in the engine bay the air wash from the fan will make it act funny.

 

Reactions: mikestang63

mikestang63

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Aug 27, 2012

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In the garage

Feb 7, 2017

#7

• Feb 7, 2017

• #7

a91what said:

Stock is 39 with vacuum off.

If you have to adjust the fuel pressure to get it right then the MAF is either wrong for the injectors or calibration is off.

Most pro m maf are meant to have the filter right on the end of them, where do you have the filter located? If it's just hanging out in the engine bay the air wash from the fan will make it act funny.

Click to expand...

^^^^ this.

Having an adjustable FPR doesn't mean you change the FP from stock unless your setup dictates it, which in this case it doesn't. .. I would run the codes- you may have a bad O2 or IAT sensor. Set it at 39 with the line off and plugged.

 

B

BeaterBeastGT

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#8

• Feb 7, 2017

• #8

Mine has an aftermarket heavy duty starter and when I hit the ignition it sounds like the damn thing is trying to eat the flex plate

 

B

BeaterBeastGT

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#9

• Feb 7, 2017

• #9

Ok thanks guys, I forgot to mention it's got an upgraded fuel pump too