ECU Talk says my ignition timing is droping??((VIDEO))

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compactfean
Posts: 2602
Joined: Thu Dec 03, 2009 10:28 am
Car: 89 240sx s13 sr gt3071r 23psi
B14 sentra ser sr20de-t 7psi
daily
Location: reno nv

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Dude, listen to these guys. If you have a knock sensor code fix it! If you have low voltage to knock sensor check voltage at sensor and ecu if they are both the same your pcm is bad. If they are.different the wire is bad. Replace it. Check timing with a light and see if its way out. You could be off a tooth on the disty. Get a fuel pressure tester and see if it drops when it bogs. Its better to test first then replace if condemned. Unplug mafs and start car. Does it idle better? Can you rev it to 2500? With a car running that poorly you should be able to run all those tests and get an answer in 45 minutes.


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ShouldaHadaV8
Posts: 365
Joined: Sat Oct 10, 2009 7:00 pm
Car: 92 hatchback 240sx, j30 diff, TIEN tie-rods
Location: N. FLA

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Well I have tested a handful of little things to help narrow the problems. The walbro did help, but didn't fix the problem. We hooked up a narrow band AFR gauge just to see what was happening. I was surprised5t to see it was actually steadily becoming too rich and not leaning out. I don't think my FPR is working so I'm going to put on my other fuel rail which WAS working fine.
gaehrings13 wrote:I know this sounds dumb... but the first thing I check when a car is bogging is the fuel pressure.. see if it is where its suppose to be at idle.. I had this same problem with my car a little while ago and I changed the pump and it still ran like crap.. Then I squeezed the return line to bump up the pressure on the injectors and the engine rev'd up good... So I changed the fuel rail with another one that I had, because I wanted to try another FUEL PRESSURE REGULATOR.. I did this and it works.. So the fpr was bad.
As for the knock sensor code 34 , i cut my old useless harness open and made sure i knew the whole circuit. so if it does come down to bypassing it to test I know its not half as hard as i thought it was. But I also don't see wiring being a concern, because from what I see the knock sensor circuit main wire is very well protected. but we will see.

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ShouldaHadaV8
Posts: 365
Joined: Sat Oct 10, 2009 7:00 pm
Car: 92 hatchback 240sx, j30 diff, TIEN tie-rods
Location: N. FLA

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OK so I replaced the FPR and swapped injectors. the old injectors didn't work anymore so i tried using the old FPR and the newer injectors, it had no positive effects. But then I started to think well Im running pig rich i sure hope there isn't ahhhhhhhhhhhhh fuel in the oil...........damn it.
Ok well i've swapped the FPR, I didn't think the injectors were leaking but now I have to double check because my other ones dont work. I doubt my piston rings are fried it only has 98K on the motor.
I dont think this is a code 34 issue anymore.


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