Replaced HG. Removed EGR. One Problem...

7mge_Rk

7mge_Rk

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May 7, 2009
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Hey Guys,

I am going to have to look over the entire Vacuum line system in my car because after the installation of the headgasket and assembling the intake, my friend and I had to reinstall all of the vacuum lines. He might have half assed the job. Nobody up here owns a Supra. Sons of bitches.

However, Tomorrow will be the day I check everything because of schedule issues.
 
jdub

jdub

Official SM Expert: Motor Oil, Lubricants & Fil
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dumbo;1315418 said:
EGR wont have any effect on idle.
Click to expand...

It also will if the EGR valve is stuck open (carbon) or if the EGR valve is getting vacuum at idle due to a mis-routing of the lines. The car will idle very rough. I know that's not the case with an EGR not installed, but the above statement is not completely correct.
 
jdub

jdub

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That's interesting 3P...so, the resistor prevents the USDM TCCS from referencing the EGR fuel/timing tables? The tables it uses to substitute with the resistor in place are the same as the JDM TCCS? (I didn't realize both the USDM and JDM tables were loaded in every ECU)
 
dumbo

dumbo

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Jul 16, 2008
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jdub;1316090 said:
It also will if the EGR valve is stuck open (carbon) or if the EGR valve is getting vacuum at idle due to a mis-routing of the lines. The car will idle very rough. I know that's not the case with an EGR not installed, but the above statement is not completely correct.
Click to expand...

Good call, I never thought of it like that. Keep forgetting he didn't physically remove it.
 
Asterix

Asterix

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Mar 31, 2005
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Pages EC13 and 14
If you activate the EGR valve while idling, the engine should stumble or stall. That's how you see if it's working. (Seconding jdub again...)

With a dead or disconnected air flow sensor the car will start but not run.

Asterix
 
3p141592654

3p141592654

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Oct 11, 2005
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The resistor just pulls a particular input to logic low (JDM=0, NA=1). The ECU code checks this particular bit at numerous places and runs different code. It completely skips the EGR subroutine if set to JDM.

The MCU includes all maps for A/T, M/T, JDM, NA. Given that the ECU code is set using masks at the time of fabrication, you want to have as few chip versions as is possible to keep costs low. No flash memory back in 1984-85 when this ECU was in development. They use lots of dirty coding tricks to save memory in these chips.


jdub;1317595 said:
That's interesting 3P...so, the resistor prevents the USDM TCCS from referencing the EGR fuel/timing tables? The tables it uses to substitute with the resistor in place are the same as the JDM TCCS? (I didn't realize both the USDM and JDM tables were loaded in every ECU)
Click to expand...
 
7mge_Rk

7mge_Rk

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dumbo;1318633 said:
As soon as he verifies the 87-88GTE, I'll be doing the mod and sending him a case of beer haha.


OP any updates?
Click to expand...

With school, no. In 5 minutes after I get out of this forum, I'm heading over to reinstall, FINALLY!! ^_^, I have had 2 dreams this week of installing the egr lol. I am about to go kick some EGR installing ass lol, sorry guys.
I am going to print out some vacuum line diagrams from the online tsrm too. BBL guys, wish me luck
 
7mge_Rk

7mge_Rk

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OK I have some news.
I believe all of the vacuum lines are in place with the exception of two coming from the railing below the Intake manifold; however not a blatant problem yet. Now, I have found a yellow-black wire from the harness with a small brown plug on the end. Can any of you locate it in your vehicles and tell or show me as to where this gets plugged into? I can't seem to find any place for it.
 

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7mge_Rk

7mge_Rk

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89Joe;1331439 said:
What they said ^ :)
Click to expand...

I am still having trouble finding the right outlet for this plug. It is not around or under the thermostat housing as pictured. and one other problem so far with the vacuum lines is this one particular VSV has three individual ports that should have their own connecting vacuum lines, however I can not find the other port to which this one on the VSV connects to (via the vacuum line).

It is a red VSV, 3 outlets. I believe it is the one responsible for fuel pressure. A reason that could quite possibly be the cause my car not holding its idle and dieing.
 

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A

AJ'S 88NA

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Jul 26, 2007
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7mge_Rk;1331494 said:
I am still having trouble finding the right outlet for this plug. It is not around or under the thermostat housing as pictured. and one other problem so far with the vacuum lines is this one particular VSV has three individual ports that should have their own connecting vacuum lines, however I can not find the other port to which this one on the VSV connects to (via the vacuum line).

It is a red VSV, 3 outlets. I believe it is the one responsible for fuel pressure. A reason that could quite possibly be the cause my car not holding its idle and dieing.
Click to expand...
The connector goes to the oil pressure sending unit like others have said.

The VSV, do you have the vac canister under the manifold, that's were one of the lines goes, another goes to the pipes that mounts to the manifold.
 
7mge_Rk

7mge_Rk

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May 7, 2009
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Medford, NY
AJ'S 88NA;1331691 said:
The connector goes to the oil pressure sending unit like others have said.

The VSV, do you have the vac canister under the manifold, that's were one of the lines goes, another goes to the pipes that mounts to the manifold.
Click to expand...

I have the two vacuum lines already connected to those areas. One from the VSV to the canister and the other from the VSV to the correct one of the pipes that mounts to the manifold. However located on the VSV is another port to which it looks like a vacuum line should connect to, but there appears to be no respective port on either the canister, piping or any other place for that matter.

As you can see from the pics, the two vacuum lines needed are already there. However there is an extra piece/port/vacuum line connector piece on the VSV, can any of you examine your own supra is in this area and tell me if there are three of those on your Fuell pressure VSV's?

As for the Thermostat housing, there is no port underneath it. I think I am the only one that owns a Supra here in medford... and with Beginner mechanics knowledge, THANK YOU ALL SO MUCH FOR YOUR PATIENCE!!!!
 
monkihead

monkihead

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Jul 23, 2005
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7mge_Rk;1331699 said:
As for the Thermostat housing, there is no port underneath it. I think I am the only one that owns a Supra here in medford... and with Beginner mechanics knowledge, THANK YOU ALL SO MUCH FOR YOUR PATIENCE!!!!
Click to expand...

its all good man. for that connector - look under your distributor, on the engine block. there should be a small round canister. it clips onto that.
 
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