 My Fuel Pressure Issue's Continue, finally back together & running |
|
|
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
|
  |
| 76-914 |
 Sep 8 2016, 08:43 PM
Post
#1
|
|
Repeat Offender & Resident Subaru Antagonist  Group: Members Posts: 13,513 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California 
 |
A month back I installed a digital fuel pressure (FP) gage and when the car died due to low and then down to no fuel pressure, I suspected the fuel pump. I confirmed that the fuse was good and replaced the pump. Turned the key and nothing. (IMG:style_emoticons/default/headbang.gif) (IMG:style_emoticons/default/WTF.gif) I failed to check for the presence of voltage at the pump connection. Idiot. (IMG:style_emoticons/default/fyou1.gif) Must have been the relay. So I reach up behind the AC and un-clip it. Bench test it w/ a 9v batt and ohm meter. Test ok! Hmmm, (IMG:style_emoticons/default/WTF.gif) Still no power at the pump. Well lets plug it back in and check for bad connections on the molex plug. Then I notice that when the FP relay was energized the 12v side leaving the relay was @ 5v. (IMG:style_emoticons/default/WTF.gif) Turn the key off and check the hot side of the relay and it reads 12v. At this pointe I'm speaking in Tongues and I'm pretty sure that I ended up in a Fetal position. What in the Hell is going on? Then I remembered what that relay served. This little Bastard. The fuel pump controller. (IMG:style_emoticons/default/headbang.gif)
 So I dropped the AC and pulled the console just to access the FPC. It was in a great place before I added AC. (IMG:style_emoticons/default/slap.gif) Once I removed the controller from the circuit I got 12v at the relay outlet. All of the turbo WRX's used one but only one Subaru EZ30 used one; mine, the 2003 YM. I had noticed that my fuel pressure varied with acceleration and that's what these do. I looked into bypassing the controller but decided Subaru knew better than I so $160 later I'll have one in a few days. Because mine is a "one year only" I had to order from the dealer. Otherwise, they're $35-$45 a pop on Ebay. (IMG:style_emoticons/default/mad.gif) The carnage. (IMG:style_emoticons/default/lol-2.gif) Not as bad as it looks. I can have it back together in an hour.  |
   |
 
|
| 11tenths |
Sep 9 2016, 08:17 AM
Post
#2
|
|
Ve get too soon old, und too late schmart Group: Members Posts: 142 Joined: 11-October 12 From: Islip, Long Island, NY Member No.: 15,026 Region Association: North East States
|
When I scrolled down to that picture I involuntarily jerked back two feet to a defensive position...
-Harry |
|
|
|
| Mblizzard |
Sep 9 2016, 10:47 AM
Post
#3
|
|
Advanced Member Group: Members Posts: 3,033 Joined: 28-January 13 From: Knoxville Tn Member No.: 15,438 Region Association: South East States |
I can put that back in 4 beers!
|
|
|
|
| rhodyguy |
Sep 9 2016, 01:31 PM
Post
#4
|
|
Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,098 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
let me know when to start the stopwatch on those 60 minutes.
|
|
|
|
| JOEPROPER |
Sep 9 2016, 01:40 PM
Post
#5
|
|
The answer is "no" unless you ask... Group: Members Posts: 1,184 Joined: 21-November 15 From: White Plains New York Member No.: 19,387 Region Association: North East States
|
|
|
|
|
| Mblizzard |
Sep 9 2016, 04:11 PM
Post
#6
|
|
Advanced Member Group: Members Posts: 3,033 Joined: 28-January 13 From: Knoxville Tn Member No.: 15,438 Region Association: South East States |
QUOTE(rhodyguy @ Sep 9 2016, 11:31 AM)  let me know when to start the stopwatch on those 60 minutes. I drink really big beers! |
|
|
|
| 76-914 |
Sep 9 2016, 06:44 PM
Post
#7
|
|
Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,513 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California
|
It came in today and I took the dogs with me to pick it up. (IMG:style_emoticons/default/piratenanner.gif) Hope my diagnosis was correct and it isn't the ECU. (IMG:style_emoticons/default/mad.gif) It may take a bit longer than an hour but not too much more.One of the benefits of modifications. You end up doing everything 15 times so you end up with a :stromberg:load of experience.
|
|
|
|
| 76-914 |
Sep 10 2016, 03:32 PM
Post
#8
|
|
Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,513 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California
|
Well Fuch me to tears. That twern't it neither. So I ordered another ECU. What's another $80. I've already thrown about $300 at this so far. I decided to verify what I already knew. Sound familiar? (IMG:style_emoticons/default/lol-2.gif) I was now getting 12v on both sides of the pump relay load side so I decided to bypass the controller and feed straight to the pump. Snip/snip, wire nuts, turn the key and nothing. (IMG:style_emoticons/default/WTF.gif) Verify voltage; 12v, yep. Hmmm. Maybe the pump plug in the tank came loose? Pulled the pump, dried the gas and jumped it at the batt. Bingo! It came to life. I take it back up front and jump it directly off of the fuse block. Nothing! Check voltage and it's now 3.87. BTW, did any ya'll hear a thunderous roar coming from southern California about 9:30 this morning? I turned the air BLUE. This 6 circuit fuse block is connected to a 4 pole distribution block. The distribution block is supplied by 2 wires. One 10ga & one 8ga. I connected the pump directly at this distribution block on the 8ga (same circuit) and nothing. Moved it to the 10ga wire and the pump came to life. Huh? (IMG:style_emoticons/default/blink.gif) Checked the voltage at both wires and the 8ga is "0" now. It runs undisturbed thru the tunnel to a main distribution fuse block in the engine compartment. I tested that fuse; good. 12v on both sides of the fuse, too. So I move the test probe a hair to the right and check the 8ga wire and it's "0". Ahaa you Son of a Bitch, I got ya! Power coming in the fuse box on this circuit, the fuse is good and there is no voltage where the wire connects???????? This is what I found:
This is the power distribution source since the conversion. The starter circuit is separate. It is supplied by a 4ga wire that enters on the left bottom. There are 2 10ga wires and 1 8ga wire that exit on the right side. The fuses are removed in the pic's. This is the front side. The questionable circuit is the middle one.  And the backside:  But look very closely at the middle, right side. See all those bubbles in the plastic. Looks like a mfg defect. Bottom line is; sometimes I got a connection and it varied. Any load applied basically changed any voltage readings I had previously taken. I thought I was going Mad. This is where an experienced mechanic's knowledge would have really helped. I assumed the presence of voltage was adequate. An experienced mech with the correct meter would have checked for amp draw and had this diagnosed in 20 minutes. (IMG:style_emoticons/default/headbang.gif) So I now have a spare 3.0 engine, ECU, fuel pump, FP controller and a neglected 4 cyl 914 sitting in my garage. (IMG:style_emoticons/default/idea.gif)  |
|
|
|
| Chris H. |
Sep 10 2016, 04:26 PM
Post
#9
|
|
Senior Member Group: Members Posts: 4,032 Joined: 2-January 03 From: Chicago 'burbs Member No.: 73 Region Association: Upper MidWest
|
I hope you're out thrashing that thing just to be sure it's fixed. Seems like that's it. Hope so. I though fuel pressure regulator since it was intermittent.
|
|
|
|
| 76-914 |
Sep 11 2016, 06:16 PM
Post
#10
|
|
Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,513 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California
|
Put it back together and started it this PM. 71psi @ start up. (IMG:style_emoticons/default/piratenanner.gif)
 I ordered another fused distribution box. I piggybacked 2 (IMG:style_emoticons/default/rolleyes.gif) on the lower circuit until the replacement box arrives. Geez,, a month down time. (IMG:style_emoticons/default/headbang.gif) Putting this one to bed!  |
|
|
|
| potomacmidget |
Sep 11 2016, 07:39 PM
Post
#11
|
|
I gotta have more cowbell.... Group: Members Posts: 161 Joined: 27-March 11 From: Maryland Member No.: 12,860 Region Association: North East States
|
QUOTE(11tenths @ Sep 9 2016, 10:17 AM) When I scrolled down to that picture I involuntarily jerked back two feet to a defensive position... -Harry Glad I an not the only one... |
|
|
|
| Elliot Cannon |
Sep 12 2016, 11:36 AM
Post
#12
|
|
914 Guru Group: Retired Members Posts: 8,487 Joined: 29-December 06 From: Paso Robles Ca. (Central coast) Member No.: 7,407 Region Association: None 
|
I went out to my 914 yesterday morning, opened the engine lid and looked at my carbs. Got in the car. It started right up and ran great all day. (IMG:style_emoticons/default/driving.gif) I just thought I would inject some joy to an otherwise depressing thread. (IMG:style_emoticons/default/av-943.gif)
Cheers, Elliot |
|
|
|
| Toast |
Sep 12 2016, 03:25 PM
Post
#13
|
|
Not bad for carrying sway bars. Group: Members Posts: 3,377 Joined: 20-January 04 From: Las Vegas Member No.: 1,580 Region Association: Southwest Region |
|
|
|
|
| 76-914 |
Sep 13 2016, 08:41 AM
Post
#14
|
|
Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,513 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California
|
QUOTE(Elliot Cannon @ Sep 12 2016, 10:36 AM) I went out to my 914 yesterday morning, opened the engine lid and looked at my carbs. Got in the car. It started right up and ran great all day. (IMG:style_emoticons/default/driving.gif) I just thought I would inject some joy to an otherwise depressing thread. (IMG:style_emoticons/default/av-943.gif) Cheers, Elliot (IMG:style_emoticons/default/poke.gif) That is unusual and certainly news worthy. (IMG:style_emoticons/default/av-943.gif) (IMG:style_emoticons/default/lol-2.gif) You know, what really grips my ass is that I put in new materials wherever possible just for the reliability. And what happens? A defective new part (IMG:style_emoticons/default/bootyshake.gif) |
|
|
|
|
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 17th June 2024 - 01:14 PM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.