All, any help and or suggestions on where to go next with my car? Other than the new crank position sensor. Details below. Sorry for the long post. Typing everything out helps my troubleshooting thoughts as well.
It has been on jack stands for almost 2 months now trying to figure out what the problem is. It started having slight hesitation under load. For example if I was in 5th going 40mph so low RPM. It was just slightly bucking. I thought I hadn’t changed the plugs in awhile and I have run TR6s since I bought the car in 2010. I installed the new plugs gapped at .030 and disconnected the battery to clean the terminals. The next time out my car died multiple times when pulling up to stop lights. It ran fine other than that. I was actually going to the track made 3 runs and drove it home.
I did some reading and it seemed the stalling could be related to a vaccum leak. This is when I started down the rabbit hole. The symptoms slowly got worse leading up to more often than not when I start, leave the car in neutral, press the gas slightly to 1500rpm it doesn’t hold the rpm. If fluctuates between 1000-1500. It will rev higher and rev to for example 4000rpm and hold while in neutral. I haven’t taken the car off of jack stands to attempt to drive it since this started. Maybe 1 out of 4 times I start it and it doesn’t act up. Shut the car off, start it again and the problem is back. I began troubleshooting and replacing parts, but haven’t seemed to make any progress with it. It is not throwing any codes. This is the frustrating part.
Here is a video of the problem
2010 Shelby GT500
Lund tune Jan 2019. No performance upgrades since tune.
2.3 TVS with VMP pulley
2013/14 injectors
62.5mm CJ Throttle Body
I installed my stock throttle body and electronics, same issue.
JLT 123mm cold air
VMP boost a pumps
I unplugged the pumps and connected stock wiring to eliminate the boost a pump and still had the same issue.
Kooks long tubes catted mid pipes
NGK TR7-IX plugs gapped at .028
I spoke to John at Lund initially and he suggested using the TR7s gapped at .028
All OEM Ford replacements done as part of my troubleshooting.
New fuel filter
New MAF
New TPMS
New EGR
New PCV
New O2 sensors
Crank position sensor going in this weekend. I didn’t realize I have to unbolt the a/c to remove it. From everything I have read it seems this could be a probable cause of my issue being the issue primarily occurs at low rpm.
Smoke tested for vaccum leaks. None found
Reloaded the tune
Thank you for any suggestions
It has been on jack stands for almost 2 months now trying to figure out what the problem is. It started having slight hesitation under load. For example if I was in 5th going 40mph so low RPM. It was just slightly bucking. I thought I hadn’t changed the plugs in awhile and I have run TR6s since I bought the car in 2010. I installed the new plugs gapped at .030 and disconnected the battery to clean the terminals. The next time out my car died multiple times when pulling up to stop lights. It ran fine other than that. I was actually going to the track made 3 runs and drove it home.
I did some reading and it seemed the stalling could be related to a vaccum leak. This is when I started down the rabbit hole. The symptoms slowly got worse leading up to more often than not when I start, leave the car in neutral, press the gas slightly to 1500rpm it doesn’t hold the rpm. If fluctuates between 1000-1500. It will rev higher and rev to for example 4000rpm and hold while in neutral. I haven’t taken the car off of jack stands to attempt to drive it since this started. Maybe 1 out of 4 times I start it and it doesn’t act up. Shut the car off, start it again and the problem is back. I began troubleshooting and replacing parts, but haven’t seemed to make any progress with it. It is not throwing any codes. This is the frustrating part.
Here is a video of the problem
2010 Shelby GT500
Lund tune Jan 2019. No performance upgrades since tune.
2.3 TVS with VMP pulley
2013/14 injectors
62.5mm CJ Throttle Body
I installed my stock throttle body and electronics, same issue.
JLT 123mm cold air
VMP boost a pumps
I unplugged the pumps and connected stock wiring to eliminate the boost a pump and still had the same issue.
Kooks long tubes catted mid pipes
NGK TR7-IX plugs gapped at .028
I spoke to John at Lund initially and he suggested using the TR7s gapped at .028
All OEM Ford replacements done as part of my troubleshooting.
New fuel filter
New MAF
New TPMS
New EGR
New PCV
New O2 sensors
Crank position sensor going in this weekend. I didn’t realize I have to unbolt the a/c to remove it. From everything I have read it seems this could be a probable cause of my issue being the issue primarily occurs at low rpm.
Smoke tested for vaccum leaks. None found
Reloaded the tune
Thank you for any suggestions