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p1105 won't go away new fps

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BostonGST

Proven Member
175
7
Feb 28, 2014
Los Angeles, California
I recently had p1105 pop up. I know it's for the fuel pressure solenoid. I tried to run it without the vac lines going to it, then switched out the solenoid to a different one. Then I took my multi meter and it is getting power when the key is turned and I directly wired it to the ECU pin #3. It still trips the CEL. Is there any other causes for this code?
 
I get this code on my 99 once every 4-5 months or so. I have never been able to figure it out. I clear it and it wont pop up again for thousands of miles. Sorry I can't help, but I'll be interested to see if you find a solution.
 
Last edited:
I too cannot get rid of the P1105, even after another known good FPS. Mine always pops up after 2-3 hot starts, example pulling over to get gas and restarting the car when its fully warmed up, or going into a store and come back out after 20 mins and start the car... P1105. But if i only do cold starts like going to work in the morning, and then letting it cool and restart 8 hours later i will NEVER get a code. I cant figure it out

Also i hooked up my boost gauge to go through the FPS so i can see when the solenoid is opened and closed. I noticed when i start the car hot, the solenoid is VERY delayed to open about 1-2 minutes later
 
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