Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
I have a 99 5.3 silverado with a 50k engine in it, I've been constantly looking for a 5 volt short, truck runs ok with a low level random misfire, the only indication is a fuel tank pressure sensor circuit code, it's not there tho, it's somewhere else, please advise,
hi sir can you put upa diagram - do you have a 5 vref established if your trying to find short that may be difficult ona 5 vref circuit but its possible im not sure the fuel pump uses 5 volt ref line
What checks have you done?
Is there a particular reason you’re concerned with reference voltage?
If you’re having a misfire you probably want to run through the basics first.
Fuel
Air
Spark
Timing
Exhaust
Compression.
Probably not in that order.
Is it a random misfire?
Is it one particular cylinder?
What are your fuel trims and 02s telling you?
Making Pressure Differential Sensors (PDA Sensors) for pressure pulse diagnostics.
Currently servicing Central Texas.
