Rising Sun Member Forums  

Go Back   Rising Sun Member Forums > Toyota 4x4 > General Tech Forum

Reply
 
Thread Tools
  #11  
Old 03-25-2009, 08:30 AM
PabloCruise's Avatar
PabloCruise PabloCruise is offline
Rising Sun Member
 
Join Date: Aug 2005
Location: Northern CO
Posts: 1,761
Default

Thanks Crash,

Do these codes match up with the symptoms I have been describing from your perspective?

No signal from distributor and TPS code = rough idle when warmed up?

Not much chatter on 3FE Yahoo on this...
__________________
TJS

1978 FJ-40
1974 FJ-55 w/ 3FE

TLCA #10713

CO/WY Horsetooth 4 Wheelers Cruiser Club - Click Here!
Reply With Quote
  #12  
Old 03-30-2009, 02:37 PM
PabloCruise's Avatar
PabloCruise PabloCruise is offline
Rising Sun Member
 
Join Date: Aug 2005
Location: Northern CO
Posts: 1,761
Default

Replaced distributor, reset ECU, still throwing codes 12 and 41.

__________________
TJS

1978 FJ-40
1974 FJ-55 w/ 3FE

TLCA #10713

CO/WY Horsetooth 4 Wheelers Cruiser Club - Click Here!
Reply With Quote
  #13  
Old 04-06-2009, 07:50 PM
Chris's Avatar
Chris Chris is offline
Hard Core 4+
 
Join Date: Mar 2006
Location: Front Range
Posts: 969
Default Hey TJ!

Pm me your address, I have your part from Cruiser88 on Mud. Somehow he sent them to me instead.
Reply With Quote
  #14  
Old 04-10-2009, 11:49 AM
PabloCruise's Avatar
PabloCruise PabloCruise is offline
Rising Sun Member
 
Join Date: Aug 2005
Location: Northern CO
Posts: 1,761
Default

I PM'd you on MUD...

Thanks
__________________
TJS

1978 FJ-40
1974 FJ-55 w/ 3FE

TLCA #10713

CO/WY Horsetooth 4 Wheelers Cruiser Club - Click Here!
Reply With Quote
  #15  
Old 04-26-2009, 08:26 AM
PabloCruise's Avatar
PabloCruise PabloCruise is offline
Rising Sun Member
 
Join Date: Aug 2005
Location: Northern CO
Posts: 1,761
Default

Exchanged TPS for a new one and installed as per FSM procedure.

Would not spec out as per FSM diagnostic!

I am starting to think Duralast parts from AutoZone are inferior to the Toyota piece...
__________________
TJS

1978 FJ-40
1974 FJ-55 w/ 3FE

TLCA #10713

CO/WY Horsetooth 4 Wheelers Cruiser Club - Click Here!
Reply With Quote
  #16  
Old 06-08-2009, 05:55 PM
PabloCruise's Avatar
PabloCruise PabloCruise is offline
Rising Sun Member
 
Join Date: Aug 2005
Location: Northern CO
Posts: 1,761
Default

I have some significant updates about my 3FE Pig since the last time I made a posting.

I hooked up a Check Engine Light (CEL) and checked for diagnostic codes. I got codes 12 (RPM Signal) and 41 (TPS). I replaced the TPS with a Toyota piece and swapped in a used distributor. While I had the throttle body off, I replaced the PCV valve, grommet, hoses, valve cover gasket and the “donuts” that seal the valve cover at the mounting bolts/studs. After this work, I still got codes 12 & 41

I sought the help of a friend who is more skilled in automotive electronics than myself. We started out tackling the Code 41 (TPS) first. Using the troubleshooting protocols outlined in the FSM, we discovered an open in the line between the computer and the VTA terminal on the ECU. We replaced this wire and then discovered no voltage at the VC terminal at the TPS – this means the TPS was not getting any power to issue a signal. We determined the line providing power to the VC terminal at the TPS was disconnected under the dashboard – wow!

I re-checked for codes and found that both code 41 and 12 were gone. I am not sure why code 12 went away now that the TPS was happy, but that is what happened. Now that the TPS was live and I had my timing set with some advance in the dizzy, my Pig had some pep in her step.

Fast forward to re-setting idle speed (golden screw) and re-checking timing… When I had the 3FE nice and warm and tried to set idle to 650, I noticed my idle was “hunting” or wandering up and down again.  When I was driving home from work on a nice warm day, I noticed the idle was stumbling while I was sitting at a traffic light. And, I was getting a code 12 again. So, back to the drawing board…

I went back to the friend with the automotive electrical background. He also has a smoke machine which is really cool, because you can use it pressurize a system and see where smoke pops out. Using the smoke machine, we found the gasket around the EGR valve at the intake was leaking. We fixed that and “smoked” the intake again, and found a very slight puff of smoke at the ISC where the plastic meets the metal. I pulled the ISC apart, flipped the o-ring and dabbed a little silicon in there. We buttoned everything up and fired the 3FE up. After it warmed up, the idle was stumbling. Wow…

We broke out the fuel pressure gauge and hooked it up at the cold start injector. Fuel pressure in the rail: 71 PSI!!! We pulled the fuel pressure regulator and tested it with compressed air, it would open to pressure. We then found we were unable to blow any air into the fuel return line. We traced the blockage back to the soft line between the gas tank and the hard line under the floor. After clearing the soft line, we blew out the hard line, blowing from the tank to the engine compartment. When we lowered the Pig (nice to have access to a lift) the engine compartment was nasty with the debris that blew out of the return line. I had it disconnected where the soft line met the return line on the engine, just behind the thermostat.

We fired the Pig up again and checked fuel pressure on the rail – all was good!!! We checked pressure with the vacuum line hooked up to the FPR, as well as with it disconnected. We then set the idle and let it idle for a good 20 minutes and the 3FE purred like a ***** cat!

The bottom line is that I believe my problems were caused by a clogged return fuel line. I think the ECU was doing all it could to manage idle when there was almost double the specified fuel pressure in the rail. I am guessing the ECU had injector pulse width pulled all the way in. But along the way I discovered issues with the fuel tank, and that I needed to pre-filter my external pump. I found my o2 and TPS to be dead. I found timing incorrectly set. I found problems in the wire harness related to the engine swap. I found a leaking EGR gasket that probably made for a good vacuum leak. I am amazed this engine ran at all!!! I am also amazed I drove it from Colorado’s Front Range to Moab, UT (and almost made it back home!) So I am glad I found these issues before finding the obstructed fuel return line.

I had tanked up just before fixing the return fuel line and noted 11 MPG. I cannot wait to see what mileage is now that the system is running 38 PSI vs. 71 PSI!

My only other observation at this point is that I think the 3FE may be missing some of that extra pressure in the fuel rail when I accelerate. I have in excess of 7 degrees advance in the engine (the BB is no longer visible in the window) and it felt nice when accelerating. Now that the fuel pressure is restored to spec, the 3FE idles flawlessly, but I think I am missing a little power. My plan is to drive it for a while and note any issues that may arise. I cleared codes on Saturday, I will check codes again next weekend.

I hope this info is helpful to other 3FE converts. This is truly how I learned to stop worrying and love the 3FE!
__________________
TJS

1978 FJ-40
1974 FJ-55 w/ 3FE

TLCA #10713

CO/WY Horsetooth 4 Wheelers Cruiser Club - Click Here!

Last edited by PabloCruise; 07-20-2009 at 04:29 PM.
Reply With Quote
  #17  
Old 06-08-2009, 06:28 PM
corsair23's Avatar
corsair23 corsair23 is offline
Rising Sun Member
 
Join Date: Jul 2006
Location: Littleton
Posts: 8,697
Default

Wow TJ...Way to keep after it!!

__________________
Jeff Z. (the "not quite as skinny" one)
TLCA #17037
'97 LX450 - aka "The Whale"
'97 FZJ80 Antique Sage AE #267, stock
12/74 FJ40, 2F, SM420, 4" Lift, ARBs, 33" MTRs

:

"...anything else i can do for you guys, how about i wash your car or mow your lawn while you figure out your firewall system? I am now boarderline insane/unibomber." Kipper

"That assumes I'm even capable of pulling and stabbing..." Jacket

"I really like having a detachable unit." Beater
Reply With Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


All times are GMT -6. The time now is 09:52 PM.


Powered by vBulletin® Version 3.7.1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.