Hesitates. Fuel Pump?
CF Monarch
Joined: Jul 2011
Posts: 5,920
Likes: 140
From: kevinkpk
The low idle can cause the 102 dtc. The maf won't cause low idle. You checked the fuel pressure regulator, not saying it still isn't. Could be fuel pump, I've never seen one work good, then not. It is low fuel related.
Thread Starter
CF Beginner
Joined: Oct 2018
Posts: 27
Likes: 0
Interesting, that is strange. Yes it will idle down sometimes. It usually idles at 550rpm in gear, but wipl drop down to 400 or lower sometimes. Starts sputtering out and then a MAF code is triggered.
I'll test the fuel psi.
I'll test the fuel psi.
Thread Starter
CF Beginner
Joined: Oct 2018
Posts: 27
Likes: 0
I bet you are right... Sometimes it sputters terribly and I shut it off. When I restart it, it idles low with an immediate MAF code that wasn't there when I shut it off.
Update:
I just checked my fuel psi regulator for the second time. This time it had a drop of fuel come out.
Update:
I just checked my fuel psi regulator for the second time. This time it had a drop of fuel come out.
Last edited by ChevyB; Mar 13, 2019 at 6:22 PM.
Thread Starter
CF Beginner
Joined: Oct 2018
Posts: 27
Likes: 0
Fixed....
It was the most stupid thing. My MAF sensor is fine. When I was about to hook up the fuel psi gauge, I noticed the battery ground cable was loose... I try to tighten it, but the side post bolt is already bottomed out and will go no further. SO, a copper washer as a spacer was just enough to get that thing tight. I then began to try to figure out what was happening. Since it was so loose, my guess is when the engine would shift under throttle, it was causing it to tug that ground wire. When it would tug the ground wire, it would create a bad ground.
What I think was happening was when I would jump the gas, is this:
1.) the engine would torque.
2.) The torquing of the engine would pull the loose ground enough to have a bad connection,
3.) then the fuel pump would cut out due to a bad ground, then the engine would settle back to its resting position due to lack of load.
4.) then the ground would connect again because the engine isn't pulling the ground cable in a resting position
5.) then the engine would torque again once there was good conductivity and tug on the ground causing a bad connection again.
and over and over causing my pulsing hesitation.
Day 5 of success, about 4 hours of drive time, well over 150 miles put on and no issues at all. Romped it and did everything possible to agitate it. I zip-tied the ground cable to some existing harnesses in the same area to eliminate additional strain from the engine torquing after getting the terminal tight.
Thanks for the help. I can't believe it.
It was the most stupid thing. My MAF sensor is fine. When I was about to hook up the fuel psi gauge, I noticed the battery ground cable was loose... I try to tighten it, but the side post bolt is already bottomed out and will go no further. SO, a copper washer as a spacer was just enough to get that thing tight. I then began to try to figure out what was happening. Since it was so loose, my guess is when the engine would shift under throttle, it was causing it to tug that ground wire. When it would tug the ground wire, it would create a bad ground.
What I think was happening was when I would jump the gas, is this:
1.) the engine would torque.
2.) The torquing of the engine would pull the loose ground enough to have a bad connection,
3.) then the fuel pump would cut out due to a bad ground, then the engine would settle back to its resting position due to lack of load.
4.) then the ground would connect again because the engine isn't pulling the ground cable in a resting position
5.) then the engine would torque again once there was good conductivity and tug on the ground causing a bad connection again.
and over and over causing my pulsing hesitation.
Day 5 of success, about 4 hours of drive time, well over 150 miles put on and no issues at all. Romped it and did everything possible to agitate it. I zip-tied the ground cable to some existing harnesses in the same area to eliminate additional strain from the engine torquing after getting the terminal tight.
Thanks for the help. I can't believe it.
Last edited by ChevyB; Mar 18, 2019 at 10:27 PM.