- Joined
- Aug 3, 2012
- Messages
- 101
The last couple days I've been trying to figure out a start issue I've been having with my EFI. I'll try to describe the symptom as best as I can and what I've done so far to troubleshoot it.
Symptoms: Bronco will generally start no problem on first attempt first thing in the morning. After driving it anywhere from 1/4 mile or beyond and then having the engine off for say more than 10 minutes, the engine has a very difficult time starting IF it starts at all. This happened Saturday when I drove to a friend's house that lives in my neighborhood and then I couldn't start it up again to go home. Had to leave my Bronco overnight at the friend's house. When I returned yesterday morning to try and start it, it did start, but took more effort than it should have. Then yesterday I drove around the neighborhood stopped back home, turned the engine off and left it off for like two minutes, tried starting it and it started back up immediately. However I then tried to restart like 10 minutes later and it would not start and wouldn't start the rest of the evening. The kicker is, up until this weekend, this start --> drive ---> stop ---> no restart has been intermittent. I've been left stranded places on a few occasions and I'm over it.
So, here's where I am at so far in my troubleshooting:
Fuel pressure is where it should be
I'm getting spark
KOEO codes are 53, 67
CM codes are 53,96
And now I'm trying to figure why the 53 code is showing up. I tested the TPS a little bit ago and am confused by my results because I am getting 5.7v on the voltage source wire (orange) and 5.7v on the sensor output (green) wire. Shouldn't the voltage source wire read around 5.0v and the sensor output wire read around 0.5v and then increase as the throttle opens? Not sure if this is the cause of my start problems, but I do need to resolve the 53 code.
Symptoms: Bronco will generally start no problem on first attempt first thing in the morning. After driving it anywhere from 1/4 mile or beyond and then having the engine off for say more than 10 minutes, the engine has a very difficult time starting IF it starts at all. This happened Saturday when I drove to a friend's house that lives in my neighborhood and then I couldn't start it up again to go home. Had to leave my Bronco overnight at the friend's house. When I returned yesterday morning to try and start it, it did start, but took more effort than it should have. Then yesterday I drove around the neighborhood stopped back home, turned the engine off and left it off for like two minutes, tried starting it and it started back up immediately. However I then tried to restart like 10 minutes later and it would not start and wouldn't start the rest of the evening. The kicker is, up until this weekend, this start --> drive ---> stop ---> no restart has been intermittent. I've been left stranded places on a few occasions and I'm over it.
So, here's where I am at so far in my troubleshooting:
Fuel pressure is where it should be
I'm getting spark
KOEO codes are 53, 67
CM codes are 53,96
And now I'm trying to figure why the 53 code is showing up. I tested the TPS a little bit ago and am confused by my results because I am getting 5.7v on the voltage source wire (orange) and 5.7v on the sensor output (green) wire. Shouldn't the voltage source wire read around 5.0v and the sensor output wire read around 0.5v and then increase as the throttle opens? Not sure if this is the cause of my start problems, but I do need to resolve the 53 code.