90 Gt Vert, The Bananna Spider

stanglx2002 · Apr 19, 2018

Codes 41/91 are typically both related to the O2 sensors not reading correctly. Most of the time it is the ground wire not being hooked up. There is a ORANGE ground wire with a ring connector that mounts to the back of the intake. You should see it on the passenger side where the throttle body is coming from the main wiring harness.

The car can also run without the IAC valve too, so you can just adjust the throttle set screw on the throttle body to lower the idle speed to the correct idle range you want. Just make sure to do this on a completely warm engine

Dontknowchit · Apr 20, 2018

stanglx2002 said:
Codes 41/91 are typically both related to the O2 sensors not reading correctly. Most of the time it is the ground wire not being hooked up. There is a ORANGE ground wire with a ring connector that mounts to the back of the intake. You should see it on the passenger side where the throttle body is coming from the main wiring harness.

The car can also run without the IAC valve too, so you can just adjust the throttle set screw on the throttle body to lower the idle speed to the correct idle range you want. Just make sure to do this on a completely warm engine

If it is this wire, than I believe it is connected, at least the part that is out of the harness. I had a leaking rear main seal that I replaced but it slung oil all over the back of this engine. The ring terminal is caked with dirt and grease but it is connected. It seems like it is connected to the back of the block or one of the heads tho.

Dontknowchit · Apr 20, 2018

I have a dead green/red alt wire. I rigged my 6g swap as seen in pic, like a 1 wire. I'd like to re do it but can't find this resistor to check it.

Dontknowchit · Apr 20, 2018

.....it drove.....on the road....even did a little mini burn out. VICTORY!

Alternator is charging but can't keep up with the e fan. Its a 2002 6g from a 3.8 sn95. Fan is from a contour. Fan is epic, tornado F3 level, may have to step up the alternator to aftermarket. Do i need more than 130a?

90sickfox · Apr 21, 2018

If the alternator is wired and working properly you shouldn't have any problems.

Dontknowchit · Apr 23, 2018

Ok. Installed new IAC and still getting the shutdown at start up until warm. After warm it seems to idle ok-ish, lil rough. Still getting o2 sensor codes. I checked the orange ground wire and it feels to be solidly attached to head, can't see it. Can I cut it and just ground it to the firewall to be sure ground is good? Should I test anything else for 41/91 codes and new sensors installed?

stanglx2002 · Apr 23, 2018

What year is your car again?
Auto or Manual?
What computer is in the car A9L or A9P?

Dontknowchit · Apr 23, 2018

1990 T5 GT. No Idea about computer differences.

stanglx2002 · Apr 23, 2018

You need to first confirm the jumper wire is in the correct location as there is differences between Manual and Auto transmissions. This connector should be on the passenger side typically under the MAF or on the side of the strut tower.

Dontknowchit · Apr 23, 2018

So jumper the connector and pull codes or test with a meter? I've not seen this pic from richker before. Is it on a checklist?

Dontknowchit · Apr 23, 2018

I unplugged what I think is the correct plug/harness. Is this it? So do I make a jumper wire to the inputs as shown above to run codes? Male or female side? Do I measure with a meter?

Dontknowchit · Apr 23, 2018

This is a shot of my computer, if it helps. Looks like a A3M1.

Dontknowchit · Apr 25, 2018

Can anyone tell me what stanglx2002 was getting after here? Do i jumper and then pull codes or test with meter across the shown ports? My computer is from a 93, is that ok?

General karthief · Apr 26, 2018

That is a diagram for the jumper wire on the o2 plug related to transmission used, Go to veryuseful.com to verify wire colors.
Do you have a repair manual?

stanglx2002 · Apr 26, 2018

Dontknowchit said:
Can anyone tell me what stanglx2002 was getting after here? Do i jumper and then pull codes or test with meter across the shown ports? My computer is from a 93, is that ok?

The jumper wire should already be there. I just wanted you to confirm that it is in the correct location for a manual transmission. People all the time just swap in wiring harnesses and not know there are small differences. Normally the jumper wires is a purple with yellow stripe.

Dontknowchit · Nov 4, 2018

Just thought I would update my thread. Life got in the way and car had been sitting, tinkering occasionally when I had time. Got to dive in over the last 2 weeks. Solved my issues with TPS and the shutdown. Essentionally, at idle, the 100a alternator cannot keep up with both contour fans on high. When the power was drawn low enough the efi would shut down. By unplugging one of the fans and fixing a few vacuum leaks I was able to take the car out for a drive today. Died twice, upon engine deceleration or at idle so I suspect more vacuum leaks. With the alternator keeping up with the single fan on high I was able to easily restart and continue on my way. Removing the air pump and egr next. In my attempts to find all the leaks. Cat tube is already welded shut anyway. Turned a corner today, I was super excited. Just wanted to share with people who care

Dontknowchit · Nov 18, 2018

Ok gang coming back to the well again for some help.
After capping one of my intake vacuum leaks things got much better but before I check and reset timing I want to be sure this stalling issue is not more vacuum leaks. (I did mess with timing while replacing the TFI module)

Situation: Stalls on cold start and occasionally randomly, at idle. Have to rev to keep cold running. Once warm, idles smoothly for most part, occasionally, randomly, will idle stall. RPMs are steady mostly, no surge. (IAC, ignition switch, fuel filter and pump all new, MAF, TB, FPR, TPS S&P shakers all clean and checked.)

After removing EGR and air pump I had a lot of vacuum likes to mend. Tab/Tad selinoids were broken as was the EGR regulator. They were all leaking everywhere.
So now that they are all out I have 2 small vacuum lines coming out of the passenger fender. I ran them to the capped off B/R feed on the vacuum tree. Charcoal Canister vacuum lines still connected. A/C is capped, brake booster and speed control lines into the drivers fender are attached. PCV and FPR lines look good. Anything else I am missing? My HVAC controls in the car do not work anyway, should I just cap the B/R port and cap the pass fender vacuum lines? Current codes are all related to the EGR and Air pump (31, 67, 81, 82, 84)

Any ideas? I feel like I'm just missing another vacuum line off somewhere. Car pulls STRONG, really have enjoyed a few drives but want more reliability before I go very far from home.

General karthief · Nov 18, 2018

Have you set the base idle?

Dontknowchit · Nov 18, 2018

No, I did not want to per the checklist pending any additional mechanical issues. You think it is time?

General karthief · Nov 18, 2018

What is it idling at

90 Gt Vert, The Bananna Spider

CT Material here

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Wasn't a pretty sight...and I've got big hands

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CT Material here

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wonder how much it would cost to ship you a pair

CT Material here

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wonder how much it would cost to ship you a pair

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wonder how much it would cost to ship you a pair

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