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Old 07-13-2014, 06:08 PM   #1
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Default NA miata stuttering at freeway speeds. Need help

As the title states, I was driving 70mph on freeway for about 20 mins, then I noticed when I was approaching a very small incline on the freeway, the miata started to stutter once I pushed down on the accelerator. I was able to continue driving at a slower pace, and it seemed to go away after a few mins of driving. Then it started to do it again a few mins after that.

Just to let you guys know, I'm boosted FM2 turbo with Link ecu, walbro 255 lpm go fuel pump, Rc 450 injectors.

Any ideas? I have check and no knocking is occurring. I'm feeling it might be too much/little fuel. Also thinking the fuel pump might be malfunctioning. The walbro is about a year old.

Any help or suggestions are appreciated.

Fred
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Old 07-23-2014, 07:08 AM   #2
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I am having the same problem, but I also noticed that my Walbro pump was getting very noisey. Have a read at this link it may hold the answer for you. I am going back to the stock pump tomorrow, I will let you know how it goes.

http://forums.hybridz.org/topic/7512...p-noisy-fixed/

Last edited by Raggie; 07-23-2014 at 09:28 AM.
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Old 07-25-2014, 10:33 PM   #3
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Quote:
Originally Posted by flyingeunos View Post
As the title states, I was driving 70mph on freeway for about 20 mins, then I noticed when I was approaching a very small incline on the freeway, the miata started to stutter once I pushed down on the accelerator. I was able to continue driving at a slower pace, and it seemed to go away after a few mins of driving. Then it started to do it again a few mins after that.

Just to let you guys know, I'm boosted FM2 turbo with Link ecu, walbro 255 lpm go fuel pump, Rc 450 injectors.

Any ideas? I have check and no knocking is occurring. I'm feeling it might be too much/little fuel. Also thinking the fuel pump might be malfunctioning. The walbro is about a year old.

Any help or suggestions are appreciated.

Fred
Typically a small stutter at high way speeds or slight inclines is ignition related. Lower rpm and with high load tend to expose bad coils or ignition components
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Old 07-27-2014, 03:13 AM   #4
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I had a stutter just like yours. It happened right after I changed from oem wheels to konig dials with the flow formed rim. I got rid of the konigs and my problem went away.

Jandjracing_58 helped me diagnose the problem. Pm him with any questions.
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Old 07-27-2014, 09:25 PM   #5
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Originally Posted by Zissou View Post
I had a stutter just like yours. It happened right after I changed from oem wheels to konig dials with the flow formed rim. I got rid of the konigs and my problem went away.

Jandjracing_58 helped me diagnose the problem. Pm him with any questions.

Thanks guy. I feel welcomed
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