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-   -   98 454 Mag Mpi mid range missfire (https://www.offshoreonly.com/forums/general-q/360479-98-454-mag-mpi-mid-range-missfire.html)

kip4234 05-15-2019 08:42 AM

I agree on the factory arrestor unless you pull cover off and it looks like this in pictures. a lot of these look like this and are very choked down on the inside with crap adapters to make them fit, The factory Vortech is a really nice piece though but it does look like your filter element has seen its better day.

kip4234 05-15-2019 08:43 AM

https://cimg3.ibsrv.net/gimg/www.off...1c000b88b9.jpg
https://cimg8.ibsrv.net/gimg/www.off...f3b1cad645.jpg

kip4234 05-15-2019 08:44 AM

nothing should be covering any part of your throttle blades

Sean400 05-16-2019 06:56 AM

Question on this engine where could I put a fuel pressure sender for a fuel pressure gauge ?

kip4234 05-16-2019 01:28 PM

you should have a Schrader valve on the fuel rail by the regulator you can screw onto that and have a gauge or see my pics my fuel rail is modded and I have a aeromotive regulator on the red anodized bracket behind intake with a liquid filled gauge, I feed the rail then the return goes out to regulator and then pressure is set there and I return excess fuel to fuel filler neck.

BBThunder 06-30-2019 05:27 PM

You seem to know about these MPIs,
Does GM have a replacement for the fuel regulator on the end of the fuel rail like some of the other sensors on the 7.4 LX MPI??
Thanks

Sean400 07-01-2019 10:24 AM


Originally Posted by BBThunder (Post 4694511)
You seem to know about these MPIs,
Does GM have a replacement for the fuel regulator on the end of the fuel rail like some of the other sensors on the 7.4 LX MPI??
Thanks

not sure if they make a replacement for it, I just searched around found the part number and scanned a bunch of sites to find the best price.


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