Jump to content


Welcome to Ultimate Subaru Message Board, my lurker friend!

Welcome to Ultimate Subaru Message Board, an unparalleled Subaru community full of the greatest Subaru gurus and modders on the planet! We offer technical information and discussion about all things Subaru, the best and most popular all wheel drive vehicles ever created.

We offer all this information for free to everyone, even lurkers like you! All we ask in return is that you sign up and give back some of what you get out - without our awesome registered users none of this would be possible! Plus, you get way more great stuff as a member! Lurk to lose, participate to WIN*!
  • Say hello and join the conversation
  • Subscribe to topics and forums to get automatic updates
  • Get your own profile and make new friends
  • Classifieds with all sorts of Subaru goodies
  • Photo hosting in our gallery
  • Meet other cool people with cool cars
Seriously, what are you waiting for? Make your life more fulfilling and join today! You and your Subaru won't regret it, we guarantee** it.

* The joy of participation and being generally awesome constitutes winning
** Not an actual guarantee, but seriously, you probably won't regret it!

Serving the Subaru Community since May 18th, 1998!

Guest Message by DevFuse
 

Photo
- - - - -

Troubleshooting conversion


  • Please log in to reply
12 replies to this topic

#1 Vinnyvango

Vinnyvango

    New User

  • Members
  • PipPip
  • 17 posts
  • Clinton, MS

Posted 08 March 2006 - 10:27 PM

Hey Volks and Folks:

First time poster here. Though I'm not new to the SubaruVanagon thing. I completed my conversion 6 years ago and this is the first trouble I've had. As a matter of fact, I haven't posted to the SubaruVanagon Yahoo Group in a while. The conversions are more refined now a days than mine so I don't have much to add. And, my conversion has been so reliable I haven't had to post much:-)). It's an 84 Westy Wolfsburg that I got for a song with a busted tranny (how's that for reversed). I didn't even bother with the wasserleaker. Went straight for the conversion.

BUT, I'm having trouble now. I've got a miss at idle and under load that I can't seem to diagnose. I've cross posted to the Yahoo group in the hopes that someone will be able to help me.

Here's the summary:

Symptom: Miss at any engine speed below about 3500 rpm. Lopes while idling cold or hot. Can't isolate it to a cylinder with either a plug wire or injector connection. Will even die at first start while idling. I've replace the coil pack and plug wires and regapped the plugs and replaced the fuel filter.

When that didn't fix it I cobbled together a fuel pressure gauge. I don't have much faith in the accuracy of the gauge but it seems to be in the ball park. Sustained pressures of 38 psi. Pressure goes up to about 42 psi with the vacuum connection to the control pressure regulator removed and when it almost dies while idling.

A vacuum test showed a narrow vibration at idle but within spec that disappears as throttle is applied. If I pinch the fuel return line closed it jumps instantly to over 100 psi, so I don't suspect the fuel pump. No obvious vacuum leaks. I sprayed carb cleaner around the intake manifold with no change.

In test mode I get the following codes:

12 Starter switch remains on (expected)
14 fuel injector
15 fuel injector
17 fuel injector
23 air flow sensor (could this be caused by the miss?)
33 Speed sensor (tried 3 different ones and can't find one it likes)
35 purge control solenoid (expected with the above)

I'd appreciate any help. It's been warm here so I REALLY need to get my bus fixed. Time to Camp and Sail!

Should I cross post this to another discussion? If so, how?

Thanks.

Shawn
84/90 Westy/Soob
Jackson, MS

#2 ShawnW

ShawnW

    Subaru Master Technician

  • Administrator
  • 12,923 posts
  • Denver, Colorado

Posted 09 March 2006 - 12:16 AM

That must be the black connector readout. Thats every code since the battery was disconnected. Not a good indicator usually.

If you have a CEL plug the green's together and report findings.

I suspect the air flow meter. When they are flaking out they cause a lack of idle. What kind of air filter setup are you using?

#3 Vinnyvango

Vinnyvango

    New User

  • Members
  • PipPip
  • 17 posts
  • Clinton, MS

Posted 09 March 2006 - 08:42 AM

Those are not the black connector codes. I'm reading from the LED in the ECU (a nice benefit of mounting the ECU under the rear cabinet).

I'm using the KEP intake system.

Thanks
Shawn

#4 ShawnW

ShawnW

    Subaru Master Technician

  • Administrator
  • 12,923 posts
  • Denver, Colorado

Posted 10 March 2006 - 09:40 AM

Your black connectors aren't plugged in?

Either way those are all the codes since the battery was disconnected, not necessarily current problems. I would disconnect the battery and drive it for 3-5 minutes and see what "new" ones come up.

#5 Vinnyvango

Vinnyvango

    New User

  • Members
  • PipPip
  • 17 posts
  • Clinton, MS

Posted 10 March 2006 - 02:29 PM

Shawn:

I don't have a CEL. (No smog requirements here). I use the LED on the ECU to check the codes. Is this giving me test mode codes or read mode codes?

Thanks.

Update. Cleaned the throttle body (dirty) and tried to adjust the idle with the IAC. Still missing. At warm idle the o2 sensor was reading .7-.82V .

Also sprayed carb cleaner around the intake/head interface. No change in idle. Varified fuel pressure readings (o.k.).

#6 Vinnyvango

Vinnyvango

    New User

  • Members
  • PipPip
  • 17 posts
  • Clinton, MS

Posted 10 March 2006 - 02:53 PM

Is there any way to check the AFM?

#7 ShawnW

ShawnW

    Subaru Master Technician

  • Administrator
  • 12,923 posts
  • Denver, Colorado

Posted 11 March 2006 - 08:07 PM

Is there any way to check the AFM?


Not that im aware of, I typically just stick another one on to rule it out. The K&N cone filters have been known to cause some problems with them.

#8 Vinnyvango

Vinnyvango

    New User

  • Members
  • PipPip
  • 17 posts
  • Clinton, MS

Posted 19 March 2006 - 06:50 PM

More info. Disconnected the battery overnite. Checked the engine ground, cleaned up the throttle body, checked again for vacuum leaks. Then drove around the block for a few minutes. Still have a miss at idle and under load. I even set up the BC/BF scan tool to read from the Subaru Select Monitor. Nothing really out of whack except for a wildly fluctuating AFM voltage. Checked the codes:

16: I disconnected it momentarily to check for a miss.
35: Purge Control; I've always gotten that one.

So what's the next move here? AFM or am I looking at a compression test?

Thanks for any suggestions.

#9 Vinnyvango

Vinnyvango

    New User

  • Members
  • PipPip
  • 17 posts
  • Clinton, MS

Posted 28 March 2006 - 04:43 PM

:banghead:

Another update and Uh-Oh.

I replaced the air flow sensor with one from the junkyard. Same thing. Miss throughout driving range.

Disconnected the battery cable overnite.

Added some Iso-heat water remover. And drove about 15 miles. Seems better but still not good. Still misses at idle and has a miss under load below 3000 rpm.

On another note. I've been reading alot. Too late. I've commited a cardinal sin. I fussed with the throttle stop screw and used a carb cleaner on the throttle body. Of course the idle is too high (1500+). I've also tried to reset the throttle position sensor.

AND to top it off, my mother hit a deer with my other vehicle so I need my bus back ASAP.

Junk yards here are asking $100 for a throttle body. But I don't think that's the source of my problems. I can live with a high idle until I can find one at a reasonable price. I am worried about the miss.

Any further suggestions?

#10 ShawnW

ShawnW

    Subaru Master Technician

  • Administrator
  • 12,923 posts
  • Denver, Colorado

Posted 29 March 2006 - 12:40 AM

Pull plug wires one at a time and see which one has the least affect on how it runs if any of them. If one (or 2) dont have a lot of change do a compression test.

#11 madaterb

madaterb

    New User

  • Members
  • PipPip
  • 16 posts
  • medford

Posted 30 March 2006 - 12:08 AM

I am thinking o2 sensor. same symptoms on my ea82. once I changed it no more jumpy throttle

#12 Nug

Nug

    Lurker/off-topic poster

  • Members
  • 1,966 posts
  • West Point

Posted 23 August 2006 - 11:03 AM

Any water down in the spark plug holes? That got me a couple times.

#13 Vinnyvango

Vinnyvango

    New User

  • Members
  • PipPip
  • 17 posts
  • Clinton, MS

Posted 17 February 2009 - 09:52 PM

I just stumbled into my old post and thought I had updated the thread. Anyway, after throwing parts at it for almost a year I finally figured it out. The hydraulic tensioner bolts came loose. Every time I hit the throttle the timing on one bank would get out of time. Since there was only one cam sensor the computer could not adjust. So take warning. The tensioner bolt torque spec (20lbs IIRC) is not enough. AND USE LOCTITE! I'm blaming it on not replacing the timing belt idlers. But who knows.
Good Luck.




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users