Dont post here much. Love my GT convertible but rarely o much to it. Recently had to do a small bit of maintenance. Now faced with something I cannot wrap my head around. Here is what we have/
GT 4.6 154K miles
Maintenance
replace of Upper Intake Manifold and Gaskets
new alternator
New Valve Cover Gaskets
Injector Maintenance
New Battery
Oil Change and Filter (full synth, high mileage)
Coolant Flush and Clean
Started it up and it purred like a kitten. Put it to bed for the night.
Next day it fired up perfectly. Backed out of garage and it began running rough. Did not even get it back into garage. Would NOT restart.
Neighbor is a professional mechanic. He brought by his super-duper, worth as much as the car tester/code reader after work. He spent more than an hour analyzing. Nothing. No codes. No failures. Every test he ran passed with flying colors. The car spent the night outside. Attempted restarts failed.
Next afternoon while waiting for my neighbor again we tried starting. First start attempt since previous day. Fired up and purred like a kitten. We pulled it into the garage.
Allowed it to idle for a minute or two. Smooth and effortless. Decided to rev to about 3K. Within 15-20 seconds it began running rough, Backed off throttle and saw a smooth idle 500-800 rpm. 30 seconds later it simply quit. As if someone had switched off the key. Would not restart.
Neighbor arrived. Repeat of previous day. No issues identified. No codes other than an occasional miss related to a single injector.
24 hours later it started right up. Tested fuel pressure at rail. Just under 40psi and solid before, during run, and after it died. Same scenario. Starts. Runs smoothly. Dies after it starts to warm or rev. Zero codes or errors to report.
Continuity observed on everything we could think to test. All leads / connection identifiable solid. Even pulled air filter from end of intake in case that was restricting flow.. Nada. Nothing.
After the engine dies attempted restarts give gas smell. flooding. No spark apparently although it is not throwing a code.
What could lead to engine shut down while not throwing any code but only after a slight warm up or period of time? Security system? A troll under the hood?
Any ideas of what to look at with this? We need some fresh thinking. Lost here.
- Dave
GT 4.6 154K miles
Maintenance
replace of Upper Intake Manifold and Gaskets
new alternator
New Valve Cover Gaskets
Injector Maintenance
New Battery
Oil Change and Filter (full synth, high mileage)
Coolant Flush and Clean
Started it up and it purred like a kitten. Put it to bed for the night.
Next day it fired up perfectly. Backed out of garage and it began running rough. Did not even get it back into garage. Would NOT restart.
Neighbor is a professional mechanic. He brought by his super-duper, worth as much as the car tester/code reader after work. He spent more than an hour analyzing. Nothing. No codes. No failures. Every test he ran passed with flying colors. The car spent the night outside. Attempted restarts failed.
Next afternoon while waiting for my neighbor again we tried starting. First start attempt since previous day. Fired up and purred like a kitten. We pulled it into the garage.
Allowed it to idle for a minute or two. Smooth and effortless. Decided to rev to about 3K. Within 15-20 seconds it began running rough, Backed off throttle and saw a smooth idle 500-800 rpm. 30 seconds later it simply quit. As if someone had switched off the key. Would not restart.
Neighbor arrived. Repeat of previous day. No issues identified. No codes other than an occasional miss related to a single injector.
24 hours later it started right up. Tested fuel pressure at rail. Just under 40psi and solid before, during run, and after it died. Same scenario. Starts. Runs smoothly. Dies after it starts to warm or rev. Zero codes or errors to report.
Continuity observed on everything we could think to test. All leads / connection identifiable solid. Even pulled air filter from end of intake in case that was restricting flow.. Nada. Nothing.
After the engine dies attempted restarts give gas smell. flooding. No spark apparently although it is not throwing a code.
What could lead to engine shut down while not throwing any code but only after a slight warm up or period of time? Security system? A troll under the hood?
Any ideas of what to look at with this? We need some fresh thinking. Lost here.
- Dave