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Old 05-10-2012, 05:47 AM   #1
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Bogging down

I have a 94 5.0 with 90,xxx it has a BBK 70 mm throttle body venom rails and injectors , Hedman short tube headers and a 2.5 inch H pipe to Series 40 flow masters ... It runs fine untill 2500 rpm then it acts like its bouncing off of a rev limiter .. Any advice ?
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Old 05-10-2012, 06:34 AM   #2
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MAF, is it plugged in? Is it calibrated for your injectors?
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Old 05-10-2012, 06:37 AM   #3
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It's plugged in.. And not that I know of and where do you get that done at ?.. They were on the car when I got it .. The previous owner said he changed the plugs and wires then it started bogging . But I checked the timing... Ad it also has 3/16 rubber fuel lines leading to the rails ..
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Old 05-10-2012, 09:00 AM   #4
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Re: Bogging down

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It's plugged in.. And not that I know of and where do you get that done at ?.. They were on the car when I got it .. The previous owner said he changed the plugs and wires then it started bogging . But I checked the timing... Ad it also has 3/16 rubber fuel lines leading to the rails ..


3/16" fuel lines?


That's pretty small and probably won't supply enough fuel to the engine.
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Old 05-10-2012, 09:02 AM   #5
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Yeh and they are a soft rubber .. I've read it's supposed to have hard metal ( factory ) or braided steel lines that won't expand.. I'm only gettin 30-33 psi at idle and 40 at WOT ...
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Old 05-10-2012, 09:07 AM   #6
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Re: Bogging down

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Yeh and they are a soft rubber .. I've read it's supposed to have hard metal ( factory ) or braided steel lines that won't expand.. I'm only gettin 30-33 psi at idle and 40 at WOT ...
Your fuel pressure should be 38-40 psi at idle with the vacuum line removed from the regulator and plugged off.


Those soft rubber lines are a fire hazard and should not be used on a fuel injection fuel system. I would replace them with the proper fuel lines ASAP.
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Old 05-10-2012, 09:09 AM   #7
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I'll get those changed ASAP!! So do you think the fuel lines would cause the fuel pressure to be low ..
This is my first mustang just tryna learn all I can
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Old 05-10-2012, 09:17 AM   #8
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Re: Bogging down

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I'll get those changed ASAP!! So do you think the fuel lines would cause the fuel pressure to be low ..
This is my first mustang just tryna learn all I can
I doubt they cause it to read low at idle, but they won't allow enough fuel flow at higher RPMs.


I would suspect the regulator or fuel pump if the pressure is to low.
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Old 05-10-2012, 09:22 AM   #9
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So would you recommend a hi out put fuel pump? And I just read the lines should be 3/8 .. And the lack of fuel would explain the sputtering when I get on the throttle ?
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Old 05-10-2012, 09:56 AM   #10
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Re: Bogging down

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So would you recommend a hi out put fuel pump? And I just read the lines should be 3/8 .. And the lack of fuel would explain the sputtering when I get on the throttle ?
A 190 lph pump should serve your needs.
Yes, lack of fuel will do that.
That may not be your entire issue though, it's hard to tell from here.
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Old 05-10-2012, 11:23 AM   #11
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Thanks so much!! Alothouhh my EGR is not properly deleted and their are screws plugging 2 vaccume lines
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Old 05-10-2012, 12:06 PM   #12
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Re: Bogging down

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Thanks so much!! Alothouhh my EGR is not properly deleted and their are screws plugging 2 vaccume lines
If you have vacuum leaks, that will cause you some issues too.
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Old 05-10-2012, 12:12 PM   #13
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There aren't any vaccume lines attached to to EGR and a throttle stop sensor .. It idles rough
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Old 05-12-2012, 06:49 AM   #14
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Try cleaning your maf very carefully. There is a small wire insie the maf use a qtip or something soft enough not to brake the wires and rub all the build up off.
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Old 05-12-2012, 07:10 AM   #15
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Thanks !!! What cleaner if any would you suggest ?
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Old 05-12-2012, 08:19 AM   #16
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I just had this issue with mine several ppl ive talked to recommend a maf cleaner from local parts store I just used a small zip tie lightly scraped the carbon build up off then used a a qtip with water to get the rest off seemed to have worked for me.
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Old 05-12-2012, 08:20 AM   #17
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Thanks for the tip!! I'll get on that!
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Old 05-12-2012, 08:23 AM   #18
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Quote:
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Thanks for the tip!! I'll get on that!
No problem!
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