[FIXED] 2001 ACURA CL 3.2 CRANKS/ NO START
- tim.smith1
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guafa wrote: Jreardon: Completely pertinent. 250mA is to low for me also (unlees tools were not fast enough to graph peaks)
Tim.smith: According to pictures of spark plugs, i was expecting totally wet ones.
I mean, wet without resistors and dry with resistors (if it's the case, we can conclude something).
did you notice any diference with and without resistors?
I can't still conclude wheter is lack or to much fuel
okay so let me make this clear the plugs i took pictures of were the plugs that came out of the car when it first came into my shop.
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- tim.smith1
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I don't think cam crank is an issue because there are no codes, there's injector and spark control, and my initial suspicion concerning the missing injector ramps after all of them fire, well, if the cam crank was an issue the missing ramps would be consistent throughout the capture, not just on initial crank, so that leads me away from cam issue.
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jreardon wrote:
www.mediafire.comtim.smith1 wrote: how do i load a movie from a versus to the forum page
www.zippyshare.com
I've think it's time we have a look at your cam and crank signals. When you have outputs that are not being turned on, like fuel injectors, it's probably due to bad inputs. Just look at the missing ramps !
You second question about the signals jumping around. That looks like a scope sample rate issue, if you had peak detect turned on you wouldn't see that. Long time bases cause this issue
Don't be a parts changer!
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jreardon wrote:
I hate to disagree with Paul here, but I think this is actually a scope ground issue. :blush: :lol: Ignition coil trigger signals (and other signal circuits) look like this when the test lead is connected to the coil, but the scope ground either isn't connected or connected poorly.
That doesn't stop the amp probe from reading correctly, however, as it doesn't need an external ground. It makes it's own voltage, and doesn't need to be grounded to the car to work. That's why the amp trace looks OK, but the trigger doesn't.
For example, I got this off my car. Green trace is connected to the #3 coil, but no scope ground is connected.
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- tim.smith1
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watch the green trace
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- tim.smith1
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I then decided to unplug the fuel pump and see if I could make the car only run on carb cleaner only with no fuel pump it did and quite well once I got the mixture right.
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guafa wrote: Guys, do we know anything about injectors?
How about a balance test? but all injectors at the same time?
cheers.
This ^
The ramps look fine now at ~1 amp each
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- tim.smith1
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Each injector has it's own ground wire to the PCM so you can't scope them all there if you're trying to get injector current ramp. For injector current ramp you need to go to common power feed. But you already captured current ramp so I'm confused.tim.smith1 wrote: how would i scope all the injectors at once off the ground wire?
If you're referring to the injector balance test, that entails installing a fuel gauge on the rail, energizing the fuel pump to pressurize the rail, and individually energizing each injector to check for flow. The balance part means ideally you want each injector to spray and drop psi on the rail, equally, in a set period of time.
If you don't have that tool to pulse injectors, you can energize each injector by grounding each injector control wire manually as right now we're just concerned about flow.
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My mistake. When i mentioned "all injectors at the same time" i was saying is so weird to have all injectors failing at the same time. I was imagining an stuck open injector adding to much fuel on cylinders. Anyway, i think a balance test is necessary at this point.
If you don't have that tool to pulse injectors, you can energize each injector by grounding each injector control wire manually as right now we're just concerned about flow.
Another tests you can perform. 1. Take out the complete fuel rail, turn on the fuel pump and look for any injector leaking. 2. Taking care of any spark and with injectors firing in the air, crank engine and look for any stuck open injector (I have seen some injectors which only get stuck open when you turn it on).
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