Sputtering over half throttle?
Hello ive been chasing this issue for a while and I can’t seem to figure out what’s wrong. Car drove perfectly fine until one night it started to sputter over half throttle. I have a turbo 1.6 with megasquirt, dw200 Fuel pump, K tuned AFPR, 850cc injectors, bmw VTPS. Running e85. Fuel pressure is set at 50psi, car idles and cruises fine but when I give it 50% throttle or more it sputters at 4200rpm. I can reach 6000rpm just fine as long as I’m not over half throttle. When it sputters it goes rich and timing drops lower. Could the tps be going out? It reads 0%-100% fine but when I go to calibrate tps the blue bar shows When I’m not on the throttle(pic attached)
https://cimg1.ibsrv.net/gimg/www.mia...de71fd935.jpeg |
Check your grounds. I had the EXACT same symptoms on my '97. It ended up being a loose battery terminal. Seems like your spark plugs aren't generating spark when the cylinders are consuming more air and fuel.
I'm not familiar with TPS sensor calibration so ignore if you're certain that's the problem. |
Originally Posted by TowerCrisis
(Post 1616306)
Check your grounds. I had the EXACT same symptoms on my '97. It ended up being a loose battery terminal. Seems like your spark plugs aren't generating spark when the cylinders are consuming more air and fuel.
I'm not familiar with TPS sensor calibration so ignore if you're certain that's the problem. |
Sounds like it’s time to pull out your spark plugs and inspect. They can tell you a lot just by looking at them. Properly gapped as well?
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Originally Posted by TowerCrisis
(Post 1616342)
Sounds like it’s time to pull out your spark plugs and inspect. They can tell you a lot just by looking at them. Properly gapped as well?
https://cimg0.ibsrv.net/gimg/www.mia...d85f11ffb.jpeg |
Did you change your dwell and spark duration settings according to the flow force instructions?
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Originally Posted by SpartanSV
(Post 1616359)
Did you change your dwell and spark duration settings according to the flow force instructions?
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.030" and 17psi is a huge gap. Put them down to .020-.025. I agree, it sounds like a spark issue.
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Originally Posted by curly
(Post 1616385)
.030" and 17psi is a huge gap. Put them down to .020-.025. I agree, it sounds like a spark issue.
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Issue found. Finally.
It was a bad ignition coil, took me a while to find out considering I probably bought another bad one from the junk yard but I eventually found the bad coil and swapped it with a good one. No issues.
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