comp not reading?

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boxcarracer89

Member

Mar 26, 2009

153

0

16

I live in Roswell NM

Jun 7, 2010

#1

• Jun 7, 2010

• #1

ok I noticed my fuel pressusre was fluxuating from 20 to 70 psi and running rich! i tried everything! So I took it to the shop to get diagnosed and the guy calls me back saying he cant read anything off my computer and the mass air flow sensor isnt even reading or anything. all he was able to tell me was to change out the comp. can anyone give advice on what could be the problem?

 

KamiKaziDK

Member

May 16, 2005

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Mesa, Az

Jun 7, 2010

#2

• Jun 7, 2010

• #2

Well that idiot mechanic sounds like one of your problems. Even if your mass air was bad, I don't think it would shoot your fuel pressure up to 70 though?? Probably your fuel pressure regulator, but I've never heard of it changing that drastically. What all do you have done to the car?

 

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boxcarracer89

Member

Mar 26, 2009

153

0

16

I live in Roswell NM

Jun 7, 2010

#3

• Jun 7, 2010

• #3

I have a brand new regulator on there an aeromotive, and I made sure it worked w my other mustang! Its stroked to a 347 w tfs heads, tfs stage 1 cam, holey intake, 32lb injectors and the mass air is calibtated to the 32lb injectors. bbk fuel pump 255lph. and I agree that mechanic sucked, ill never take it back!

 

KamiKaziDK

Member

May 16, 2005

555

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Mesa, Az

Jun 7, 2010

#4

• Jun 7, 2010

• #4

what brand is the maf?

 

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BYRDPE

Founding Member

Nov 4, 1998

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Memphis,Tn.

Jun 7, 2010

#5

• Jun 7, 2010

• #5

boxcarracer89 said:

ok I noticed my fuel pressusre was fluxuating from 20 to 70 psi and running rich! i tried everything! So I took it to the shop to get diagnosed and the guy calls me back saying he cant read anything off my computer and the mass air flow sensor isnt even reading or anything. all he was able to tell me was to change out the comp. can anyone give advice on what could be the problem?

Click to expand...

what are you using to verify it's actually running rich? also, did you try unplugging your maf to see if anything changes?

 

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boxcarracer89

Member

Mar 26, 2009

153

0

16

I live in Roswell NM

Jun 8, 2010

#6

• Jun 8, 2010

• #6

im not to sure what brand the maf sensor is, and yes i did unplug it and its not working. I have a gauge off of the fuel line and it tells me the psi. Also I had it dynoed and they told me the fp reg wasnt doing anything and it was running rich off the dyno! any ideas?

 

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boxcarracer89

Member

Mar 26, 2009

153

0

16

I live in Roswell NM

Jun 9, 2010

#7

• Jun 9, 2010

• #7

is it possible its the fuel pump??