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I have a 1995 eclipse rs that i recently put a turbo on. My fuel system consists of a walbro 255, sfmu with largest disc and small hard spring, dsm 450cc injectors. I am running around 10-14psi i just havent really messed with the boost yet because of the stuttering problem. When at wot the car will hesitate and stutter at 4000-4500rpm. Right at the power band is when it stutters. I have new injectors, new fuel filter, the fuel pump was new,and new fuel return line. I just put plugs and wires in not too long before i installed the turbo. Where do i start to diagnose this problem?
Last edited by Defiant; 05-30-2008 at 09:47 AM.
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i just bought those plugs and they dont even fit? They are too big. When putting them in the hole it doesnt even make it all the way in. They also required a 21mm socket to install and theres no way the plug and socket would fit in there. Should i just try the ones i had but just gap them a .28?
i just installed NGK BKR7E plugs and gapped them to .32 The car is still doing the same exact thing. No difference it is still stuttering and losing power at 4000-4500 rpm.
Make sure your wires are good. cheap aftermarket ones won't work. Try some NGK wires as well and dont forget to use a lot of dialectric grease on both ends of the wires.
Im just so sick of not being able to drive my car to its full potential. The car only stutters at wot and its very annoying. Ever since i put this turbo on its been stuttering at the same rpm band. I have tried many things and so far nothing at all has worked. What are any other possibilities for this car to run right??
The plug that defiant told me to use wouldnt even go in the hole where the spark plug goes. It was wayy to big. I will test the coil pack and see if thats it but for some reason im starting to think that it isnt anything related to spark.
When I first got my car it would do a very similar thing. The biggest problems came around 5psi or more boost. I used the plugs for the 4g63 that defiant said to use (bpr6es) and problem was solved. I was so worried that something bigger was wrong with the car I had just bought. PLUGS solved my problem right away.
Ehhh, BKR7E and BKR7E are the exact same size. But 6 is a colder plug. Like they keep saying, gap it at .28. And your running 14lbs on a stock NT block?
no its completely rebuilt. i guess i will take the plugs out and try gapping them at .28 but i really doubt thats going to work. i know it may have worked with your cars but keep in mind im 420a your 4g63.
I've been plagued with a similar issue. Except mine started when I added an SAFC to the equation. I was already tuning with a a MAFT and I decided to add the AFC just to make it easier to tune "on the fly."
I'm still using the Trans to compensate for injectors but other than that, I use the AFC. And no matter how hard I try, I always start to backfire rapidly/stutter around 3.5k-4.5k depending on how I play with the tuning.
I'll be interested to know what your solution is...I've been unable to fix my stutter for going on 4 months now.
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~Christi~
*Power by Jusmx141*
id rather not take it to a shop because absolutely no one around here knows anything about aftermarket cars. If its not stock they can't work on it, every shop around here is a joke. The only thing i can do is keep troubleshooting things and eventually i'll fix it. I replaced the map sensor, could the part that plugs into the map sensor be causing this problem? Is there anything in the ecu that would cause this to happen? Could the fuel pump be burned out and cant pump enough fuel?
Did you try a boost leak test? I was having vry similar probelms and it turned out my b.o.v was leaking at the flange of the b.o.v itself. I built a boost leak tester for about 6 dollars from a local hardware store. it wouldn't hurt to test it. If incoming air is being measured from your air flow sensor and being lost through a boost leak the motor won't have the corect a/f ratio which could cause misfires therefore giving you a stuttering problem
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92tsi fwd
92parts car
90tsi awd
96tsi wifes
well actually i havent done a boost leak test yet. Once again,i highly doubt this is the problem, but i will do a boost leak test tomorrow to rule it out.
Just F.Y.I. (since I've been having the same problem), I've done countless leakdown tests on my car to no avail. Holds pressure very nicely.
I'm pretty sure that "stutter" lies somewhere in air/fuel management since I had no problems until I added an AFC. I'm not saying don't do your leak test, it could very well be your problem...I'm just saying that it didn't resolve anything for me.
____________________________
~Christi~
*Power by Jusmx141*
![[RESOLVED] Stutter problem around 4-4500k rpm](/forums/iconimages/newbie-thread-graveyard/resolved-stutter-problem-around-4-4500k-rpm_ltr.gif)
it has to be something with the air/fuel i know it!
