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96 EX Coupe
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6 Posts
Discussion Starter #1
So recently boosted a d16y8 and finally past the break in stage with problems. The car recently started to misfire and run like crap but only when giving throttle input (could be 5%-100%) and it breaks up and backfired but isles fine. When it backfires and runs like crap the A/F reads lean like 15-16/1 but I pulled the plugs and they look normal. Really at a loss and not sure what to do. The car will idle perfect which kills me.
 

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Meat Popsicle
91 CRX Si
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2,929 Posts
First and foremost, check your mechanical timing and your base ignition timing (service plug jumped and timing light).

Then you can start looking into the ignition timing map.

Distributor good? Do you get a CEL when it misfires?
 

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1993 Del Sol
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14 Posts
Weird. Wouldn’t have thought that would have fried the ECU. Could have seen it damaging the injectors but surprised that it hurt the ECU
Oh yeaaaa that's the only thing it will mess up to! When i was doing research on high and low impedance injectors for my d16z6 turbo build i ran into that. The cause is; the cars without a resistor box use high impedance injectors. The injectors are given a certain amount of power from the ecu to pulse and a certain duration. When you just stick in low impedance injectors, they end up causing that bit of the ecu to work way faster with shorter durations which burns it out.... I'm just surprised it took that long to happen..got me scared now and wanting to check the ohms on mine.
 

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1993 Del Sol
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14 Posts
Found the issue, fried the ecu by running to low impedance injectors with no resistor box
Did you buy "high impedance" injectors from a business and they turned out to be bullshit? Or did you just get injectors from a person and didn't even think about the impedance? (Not being an arse, just wanting to know because i got my 650s from a company that isn't name brand and i never checked the ohms before installation. I'm going tuning on Sunday and i don't want a surprise like that. But even with the base map mine runs fine, at idle and boost.)
 

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96 EX Coupe
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6 Posts
Discussion Starter #9
No so let me explain from my pain 😂. So when you run low impedance Injectors it draws a higher amp rate. The injectors I had we’re pulling 25 amps off the ecu which is waaaay to much. When you add a resistor box it increases the resistance of the circuit so low would be like 3-6 ohms and high is 12-15 I think. Non the less the higher impedance the less amp draw. Most cars today need high impedance injectors. And that’s where I messed up oh well: my motors knocking now it’s all good. Literally can’t win with my build
 

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Registered
96 EX Coupe
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6 Posts
Discussion Starter #10
Did you buy "high impedance" injectors from a business and they turned out to be bullshit? Or did you just get injectors from a person and didn't even think about the impedance? (Not being an arse, just wanting to know because i got my 650s from a company that isn't name brand and i never checked the ohms before installation. I'm going tuning on Sunday and i don't want a surprise like that. But even with the base map mine runs fine, at idle and boost.)
As long as there 12 ohms you should be fine. One thing I noticed right away with the injectors was throttle response was very jerky like you give it throttle and there’s be a slight delay in response, if it’s doing that check your injectors frying a ecu is no fun
 
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