 1.8 Ljet overfuels |
|
|
|
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. |
|
|
| davesprinkle |
 Dec 30 2007, 09:09 PM
Post
#1
|
|
Senior Member  Group: Members Posts: 720 Joined: 13-October 04 From: Berkeley, CA Member No.: 2,943 Region Association: None 
 |
My 1.8 Ljet left me stranded yesterday. I did the usual debug stuff. Turns out the ECU is overfueling the engine. Injector pulsewidths are 10ms to 15ms under cranking conditions. This is roughly 10x what I would expect at startup. Anybody have any suggestions for what might be causing this problem? The airflow sensor maybe?
Thanks for any suggestions you can offer. -dave sprinkle |
   |
 
|
  |
Replies
| davesprinkle |
Mar 29 2008, 12:59 PM
Post
#2
|
|
Senior Member Group: Members Posts: 720 Joined: 13-October 04 From: Berkeley, CA Member No.: 2,943 Region Association: None
|
I've finally found the cause of my ljet fueling problem. A puncture in the pressure reg diaphragm was passing fuel through the vent line and was dumping it into the intake plenum. Note that the pressure reg was STILL MAINTAINING PRESSURE even while filling up the engine with raw fuel.
Why am I surprised? I should have inferred from the deterioration of my targa seal that rubber parts don't last 30 years... Thanks to everyone who offered advice and spare parts. |
|
|
|
| type47 |
Mar 29 2008, 07:02 PM
Post
#3
|
|
Viermeister Group: Members Posts: 4,254 Joined: 7-August 03 From: Vienna, VA Member No.: 994 Region Association: MidAtlantic Region |
QUOTE(davesprinkle @ Mar 29 2008, 10:59 AM)  A puncture in the pressure reg diaphragm now how in the world did you find that? or think that was a possibility? you're GOOD! (IMG:style_emoticons/default/pray.gif) |
|
|
|
| davesprinkle |
Mar 29 2008, 07:41 PM
Post
#4
|
|
Senior Member Group: Members Posts: 720 Joined: 13-October 04 From: Berkeley, CA Member No.: 2,943 Region Association: None
|
Thanks for the kind words, but I can't claim any brilliance on this one. It was a triumph of perseverance over lack of insight. I tried a new ECU, a new loom, a new sensor, but still had the same problem of too much fuel. Finally, today, with the injectors all removed from the engine, I STILL HAD FUEL GETTING INTO THE ENGINE. What the EFF? Is this engine MANUFACTURING gasoline??? The last remaining connection between the fuel system and the plenum was the reg vent line. I pulled it off, turned on the fuel pump, and sure enough, it pissed fuel into my face. Don't worry about me, I'll recover my eyesight soon.
So, no, I'm not good. I'm slow. It took me, what, 3 months to figure this out? Jeez... QUOTE(type47 @ Mar 29 2008, 06:02 PM) QUOTE(davesprinkle @ Mar 29 2008, 10:59 AM) A puncture in the pressure reg diaphragm now how in the world did you find that? or think that was a possibility? you're GOOD! (IMG:style_emoticons/default/pray.gif) |
|
|
|
Posts in this topic
davesprinkle 1.8 Ljet overfuels Dec 30 2007, 09:09 PM
Twystd1 Check your grounds FIRST....!!!!... Dec 30 2007, 09:17 PM kwales If your fuel pressure regulator is sticking, then ... Dec 31 2007, 09:11 AM davesprinkle Thanks for your responses, guys. Ground are OK. ... Dec 31 2007, 09:39 AM Cap'n Krusty FIRST thing to check on a 1.8 is the air flow mete... Dec 31 2007, 09:58 AM
davesprinkle
FIRST thing to check on a 1.8 is the air flow met... Dec 31 2007, 03:37 PM Cap'n Krusty That's not all that uncommon on Vanagons, BMWs... Mar 29 2008, 04:05 PM davesprinkle Yeah, thanks for the support, Cap'n. Wanna se... Mar 29 2008, 06:56 PM jesiv I don't quite understand. However, this sound... Mar 29 2008, 10:38 PM davesprinkle Sorry, James, don't have any pics of the damag... Mar 30 2008, 12:10 AM |
2 User(s) are reading this topic (2 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 31st October 2024 - 07:25 PM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.