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09-14-2018, 05:06 PM | #1 |
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Won't start after clutch change
I have a 2013 Frs. Several weeks ago I put a new ACT street clutch and LW flywheel in it. After putting it all back together It won't cranks but won't start. I've already checked a lot of things:
No ECU codes has fuel pressure no blown fuses all connectors securely reconnected no pinched wires crank sensor replaced It ran perfectly before, but now when I turn the key it just cranks, it will pop kind of like a backfire every few seconds. It seems like the timing got thrown off but I was hoping someone here could give me some more info before I pull the cover. While I have heard that turning the flywheel backwards (I did this while torquing the FW) could cause a timing belt to skip is that even possible with the chain on these engines? |
09-14-2018, 05:38 PM | #2 |
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"no ecu codes"
"crank sensor replaced" If you've got an obd scan tool, did you check the engine rpm PID while cranking? |
09-14-2018, 09:35 PM | #3 |
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Hello RenegadeReaper and welcome to - The Forum -
We have some pretty smart folks on the forum that may be able to help you out - but, I ain't one of them - Someone will be along soon. humfrz |
09-14-2018, 11:36 PM | #4 |
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@RZNT4R
"no ecu codes" "crank sensor replaced" To be more specific, I have and Open Flash Tablet which will give any cel codes. after checking my wires and making sure the fuel pump was working I replaced the crank sensor because with what info I could gather it seemed like the most likely culprit. It wasn't. "If you've got an obd scan tool, did you check the engine rpm PID while cranking? " Are you referring to the realtime data through obd2? Does the ecu use the crank sensor to calculate this? I didn't think of that before, but it's always matched the gauge roughly so i guess that would mean it's reading properly. or am I wrong? @humfrz Thank you and I hope you're right. None of the mechanics in my area are familiar with these cars. |
09-14-2018, 11:45 PM | #5 |
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Take it all back apart and flip the crankshaft position scale around. The teeth are supposed to face forward, away from the flywheel.
It's a common mistake.
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09-15-2018, 07:53 AM | #6 | |
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Quote:
It's easy to check as it requires no disassembly. |
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The Following User Says Thank You to RZNT4R For This Useful Post: | Ultramaroon (09-15-2018) |
09-15-2018, 07:27 PM | #7 | |
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Quote:
Well I have confirmed that the problem is not the sensor, but what are you referring to by the "scale?" The only thing I remember with "teeth" was the flywheel itself, and the plate behind it was definitely facing away. |
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09-15-2018, 07:40 PM | #8 | |
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Quote:
People do install it backward. Try RZNT4R's idea of reading the RPM.
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09-15-2018, 10:08 PM | #9 | |
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Quote:
TBH I'm not sure what reading the rpm is supposed to tell me other than that the crank sensor is working. I originally thought that I might have damaged the sensor while replacing the flywheel but since I already replaced it, that apparently wasn't the case. I was hoping to get some other ideas as to what might be wrong. the short version is: still have fuel, air, spark, and no cel codes but it won't start and the timing doesn't sound right. |
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09-15-2018, 11:49 PM | #10 | |
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Quote:
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09-16-2018, 02:31 AM | #11 | |
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OK, folks, how does one check the timing on these new fangled machines?? I was good with a couple of lengths of wire and a 12V light bulb and later on a timing light - but, today, I have no idea. The OP needs help! Anyone? humfrz |
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09-16-2018, 07:01 AM | #12 |
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By looking at the live data you're looking for a low or intermittent reading. The crank sensor is (surprisingly) a pretty old school AC voltage generator, if it or it's reluctor are misaligned, sufficiently high AC voltage can't be generated.
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The Following User Says Thank You to RZNT4R For This Useful Post: | Ultramaroon (09-16-2018) |
09-16-2018, 08:28 PM | #13 |
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After going over what I did with a rather knowledgeable mechanic in my town I think I figured it out. If the crown plate that Ultramaroon mentioned is what the crank sensor is reading then I probably didn't put it back properly, there should be marks that I have to line up right? So atm even though the rpm is right the sensor is picking up the wrong crank position.
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09-16-2018, 08:53 PM | #14 |
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Check out my build. I have pics of my clutch install and the correct plate orientation.
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My Build | K24 Turbo Swap | *K24T BRZ SOLD*
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