Blown Engine(piston no.4)
May 17, 2004, 06:26 PM
#17
Possibly.. a failing/failed fuel pump can produce low output without failing altogether.. it would only be painfully obvious during high rpm operation.
There have been a few threads regarding pump output issues on some evo's.. One of the recommended upgrades is a new fuel pump if you have any real mods going on.
There have been a few threads regarding pump output issues on some evo's.. One of the recommended upgrades is a new fuel pump if you have any real mods going on.
Jun 29, 2004, 07:14 AM
#19
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Originally Posted by evo_artist
so another #4 melted piston and should raise a lot of question marks to tuners
its the 3rd case of #4 melted piston that i hear in the forum
its the 3rd case of #4 melted piston that i hear in the forum
It isn't providing enough fuel to piston #4 since it's the farest on the fuel rail. Open up any motor, #1 would be pretty dark on the piston head and progressively lighter to #4. The exception to the rule: bad valve seals or toasted o-rings.
Jun 29, 2004, 07:25 AM
#20
I've often seen people tackle this by equalizing the fuel rail... basically they split the supply line to the fuel rail and tie it in at both the beginning and end of the fuel rail. This gives a more even flow thruout the entire rail.
That coupled with a wiring upgrade to your fuel pump should help alleviate the issue. Your pump and injectors should easily handle that boost but they need to operate effeciently and consistantly. Try the fuel rail trick and the wiring upgrade. Also install a fuel pressure gauge in a central location on the fuel rail once your done with the equalization. This will allow you to better monitor it on the dyno.
Good luck... as a future 4G63 owner i've been checking out a lot of issues and there are a lot. Don't let little setbacks like this get you down as there is always a fix.
That coupled with a wiring upgrade to your fuel pump should help alleviate the issue. Your pump and injectors should easily handle that boost but they need to operate effeciently and consistantly. Try the fuel rail trick and the wiring upgrade. Also install a fuel pressure gauge in a central location on the fuel rail once your done with the equalization. This will allow you to better monitor it on the dyno.
Good luck... as a future 4G63 owner i've been checking out a lot of issues and there are a lot. Don't let little setbacks like this get you down as there is always a fix.
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