Buddy and I installed a new 420CI engine and built trans in my Hellcat. Yes, for those following along, this is essentially engine number 4...I don't have the best of luck. Anyway, since the install, I've had P0340 and P0339 codes. I've changed both sensors with OEM sensors. I've changed the starter. The battery is fully charged putting out 12.4+ amps while off and 14+ while running.
The car cranks forever and a day, sometimes taking multiple attempts but it does eventually fire. I'm being told that the log shows that there's no RPM signal but once it figures out the RPM after multiple attempts, it will show a signal and fire up. Eventually it loses the signal and dies. Could be two minutes, could be ten. Once it loses the signal, it is nearly impossible to get it started again, or keep it started if it does start.
General consensus is that it's an electrical issue, or it's the reluctor wheel. The engine shop swears it has the correct wheel.
It could be one bad connector, but it seems odd that I'd have codes for two sensors if only one is bad. A tech checked the crank connector and said voltages were correct. I tried to check the crank connector and got 4.8 on one set of prongs but that's about as much as I was able to figure out since I don't know didley about electrical. I'm happy to try stuff is someone wants to walk me through it via zoom or messenger.
So what I'm trying to figure out is if there's a common ground or wire that might be pinched or shorting or was left off by accident. I've checked and cleaned the grounds that I know of. I have one ground wire going to the trans bolt. I have two wires going to the stud under the supercharge coolant tank. I have one wire going to the stud under airbox. I believe there is one wire going to a stud in the trunk. Am I missing any?
These other things may be red herrings, but I need to mention them. The buttons on all three key fobs have stopped working. I've changed the batteries in all three fobs, repeatedly, with new batteries from Walmart, and there's no change. The car still senses the fobs and reacts when I touch the door handle and has no issues when I try to start the car. It's just that the buttons don't work. The car has been sitting for 19 months, mostly with the battery unhooked. Can the car "forget" the fobs, yet still recognize them with the handles and start button? Is there some connection to the crank and cam sensors? Is there something else I need to check that could be causing this issue?
I'm getting an SES code now and then, and the swerving car light comes on the dash.
Another possible herring is that the cigarette lighter in the dash no longer works. I've checked the fuse and it's fine.
And the final possible red herring is that the car eats batteries like no one's business. This has nothing to do with the new engine since it's done it for a couple years, but I figured I'd mention it. I can kill a new battery in one to two weeks if I don't have it on a charger. I think I'm on new battery number six with many recharges for each battery before they go completely bad.
So, any thoughts? Does any of this seem to connect to a common wire or source? If someone wants to walk me through anything, I will try it. I'm clueless about electrical but I'm a good monkey and will do what you say. I am on my last effort before I ship the car off somewhere to have them figure it out. It's been sitting here for months and I simply can't figure it out. I've been told an oscilloscope would tell us stuff, but I don't have one and don't know anyone who does. So if there's anything I can try short of that, I'm game. Thanks in advance for your help. I'm beyond frustrated.
The car cranks forever and a day, sometimes taking multiple attempts but it does eventually fire. I'm being told that the log shows that there's no RPM signal but once it figures out the RPM after multiple attempts, it will show a signal and fire up. Eventually it loses the signal and dies. Could be two minutes, could be ten. Once it loses the signal, it is nearly impossible to get it started again, or keep it started if it does start.
General consensus is that it's an electrical issue, or it's the reluctor wheel. The engine shop swears it has the correct wheel.
It could be one bad connector, but it seems odd that I'd have codes for two sensors if only one is bad. A tech checked the crank connector and said voltages were correct. I tried to check the crank connector and got 4.8 on one set of prongs but that's about as much as I was able to figure out since I don't know didley about electrical. I'm happy to try stuff is someone wants to walk me through it via zoom or messenger.
So what I'm trying to figure out is if there's a common ground or wire that might be pinched or shorting or was left off by accident. I've checked and cleaned the grounds that I know of. I have one ground wire going to the trans bolt. I have two wires going to the stud under the supercharge coolant tank. I have one wire going to the stud under airbox. I believe there is one wire going to a stud in the trunk. Am I missing any?
These other things may be red herrings, but I need to mention them. The buttons on all three key fobs have stopped working. I've changed the batteries in all three fobs, repeatedly, with new batteries from Walmart, and there's no change. The car still senses the fobs and reacts when I touch the door handle and has no issues when I try to start the car. It's just that the buttons don't work. The car has been sitting for 19 months, mostly with the battery unhooked. Can the car "forget" the fobs, yet still recognize them with the handles and start button? Is there some connection to the crank and cam sensors? Is there something else I need to check that could be causing this issue?
I'm getting an SES code now and then, and the swerving car light comes on the dash.
Another possible herring is that the cigarette lighter in the dash no longer works. I've checked the fuse and it's fine.
And the final possible red herring is that the car eats batteries like no one's business. This has nothing to do with the new engine since it's done it for a couple years, but I figured I'd mention it. I can kill a new battery in one to two weeks if I don't have it on a charger. I think I'm on new battery number six with many recharges for each battery before they go completely bad.
So, any thoughts? Does any of this seem to connect to a common wire or source? If someone wants to walk me through anything, I will try it. I'm clueless about electrical but I'm a good monkey and will do what you say. I am on my last effort before I ship the car off somewhere to have them figure it out. It's been sitting here for months and I simply can't figure it out. I've been told an oscilloscope would tell us stuff, but I don't have one and don't know anyone who does. So if there's anything I can try short of that, I'm game. Thanks in advance for your help. I'm beyond frustrated.
