Post build no start and buzzing from ignition relay
05-12-2018, 08:53 PM
#1
Staging Lane
Thread Starter
Post build no start and buzzing from ignition relay Hey guys,
So I just finished my cam swap and valve train upgrade build today on my 99 FRC C5. When I turn the ignition the car does not attempt to turn over. My headlights and dash work without problem. After this I went to erase past DTC thinking that current codes would be visible during the next crank attempt. So now it shows me a code category only and no specific codes ( said no comm. next to the category). Lastly, while the ignition is turned to the on position a significant buzzing is coming from # 42 (Ignition relay) in the engine bay fuse box.
List of DTC categories: 28-TCS, 40-BCM, 58-SDM, 60-IPC, 80-Radio, 99-HVAC, B0-RFA.
I have double checked all connections I could think of and am stumped as to where to go from here. Any and all help would be greatly appreciated.
Matthew
So I just finished my cam swap and valve train upgrade build today on my 99 FRC C5. When I turn the ignition the car does not attempt to turn over. My headlights and dash work without problem. After this I went to erase past DTC thinking that current codes would be visible during the next crank attempt. So now it shows me a code category only and no specific codes ( said no comm. next to the category). Lastly, while the ignition is turned to the on position a significant buzzing is coming from # 42 (Ignition relay) in the engine bay fuse box.
List of DTC categories: 28-TCS, 40-BCM, 58-SDM, 60-IPC, 80-Radio, 99-HVAC, B0-RFA.
I have double checked all connections I could think of and am stumped as to where to go from here. Any and all help would be greatly appreciated.
Matthew
05-13-2018, 08:39 PM
#2
Staging Lane
Thread Starter
So I started back tracking and it turns out that like an idiot I forgot to tighten down the negative or ground wire (big black wire) on the starter solenoid. I had to take the header off to reach it then buttoned everything back up and she lives. About 5-10 minutes into the test drive the test engine light came on so I retrieved the codes with success this time. There are 4 codes under 28-TCS, 1 codes now under 40-BCM (U1255 H) , 5 codes under 58-SDM, and 4 codes under B0-RFA. I am taking the car to Powertech performance in Tampa on Wed for a tune so hopefully things will get worked out. I would like to further my understanding of engine electrical theory. I have researched cam theory and am decently inclined mechanically but when it comes to electronics I am in the dark. Any good beginning resources that you would recommend?
Also, when the car gets to full operating temperature the idling oil pressure drops to about between 20-30. I dont remember it getting into the 20's with the stock pump. Under partial throttle (didn't take it much past 3K today) it does jump up to 40-50. The new pump is the Melling standard volume high pressure unit. Is this normal or to be expected?
Matthew
Also, when the car gets to full operating temperature the idling oil pressure drops to about between 20-30. I dont remember it getting into the 20's with the stock pump. Under partial throttle (didn't take it much past 3K today) it does jump up to 40-50. The new pump is the Melling standard volume high pressure unit. Is this normal or to be expected?
Matthew
