1989 Gmc Jimmy 350 high speeds spark problem* Please help***problem still exists

[Spribble89]

Do you have a 700R4 transmission in your vehicle? If yes, did you remember to attach the electrical connections after you installed it?
Do you have headers on your vehicle?
Please provide more vehicle information in general.

Yes its the 700r4, and yes everything is hooked up except on the driver side of the tranny there is a white square electrical port that is not plugged in. The transmission shop didn't plug it in and they zip tied it up and out of the way. But I don't know why. I'm not even sure what that square white electrical plug does.

 

[Spribble89]

Do you have a 700R4 transmission in your vehicle? If yes, did you remember to attach the electrical connections after you installed it?
Do you have headers on your vehicle?
Please provide more vehicle information in general.

Alright I did some research, that white square electrical port is for the torque converter lockup. But it is not plugged in. And the tranny shop didn't plug it in but Idk why.

 

[magik235]

The port communicates between the tranny and the computer. As suggested earlier and indicated by your own neutral test your noise could be transmission related. I would talk to the tranny shop and find out why it isn't hooked up.

 

[magik235]

Any updates?

 

[Spribble89]

Any updates?

Yea I cleaned all my electrical wires and where they all connect, and I plugged in that white square 4 pronged transmission connection called the torque converter lockup. So far the past few days it hasn't acted up. But sometimes it dies this, it will drive fine for a few days then act up again. But I will keep you updated about it. If it acts up again I will post it. If you come up with any other ideas of what it may be, please tell me. Thank you so much for your help.

 

[spribble1989]

Problem still exists. Not sure what it is

 

[dyeager535]

Start over. What, if any, codes are you still getting? That assumes the check engine light still works.

 

[euzoa]

All data says

Wiring Diagram For Code 32

CIRCUIT DESCRIPTION
The ECM operates a solenoid to control the Exhaust Gas Recirculation (EGR) valve. This solenoid is normally closed. By providing a ground path, the ECM energizes the solenoid which then allows vacuum to pass to the EGR valve.

The ECM monitors EGR effectiveness by de-energizing the EGR control solenoid thereby shutting off vacuum to the EGR valve diaphragm. With the EGR valve closed, fuel integrator counts will be greater than they were during normal EGR operation. If the change is not within the calibrated window, a Code 32 will be set.

The ECM will check EGR operation when:

• Vehicle speed is above 50 mph.
• Engine vacuum is between 40 and 51 kPa.
• No change in throttle position while test is being run.

TEST DESCRIPTION
Numbers below refer to circled numbers on the diagnostic chart:

1. By grounding the diagnostic terminal, the EGR solenoid should be energized and allow vacuum to be applied to the EGR valve and the vacuum should hold.
2. When the diagnostic terminal is ungrounded, the vacuum to the EGR valve should bleed off through a vent in the solenoid and the valve should close. The gage may or may not bleed off but this does not indicate a problem.
3. This test will determine if the electrical control part of the system is at fault or if the connector or solenoid is at fault.
4. This system uses a negative backpressure valve which should hold vacuum with engine "OFF".
5. When engine is started, exhaust backpressure should cause vacuum to bleed off and valve should fully close.

DIAGNOSTIC AIDS
Before replacing ECM, use an ohmmeter and check the resistance of each ECM controlled relay and solenoid coil. Refer to Chart C-9A ECM QDR Check Procedure. See ECM wiring diagrams for coil term. I.D. of solenoid(s) and relay(s) to be checked. Replace any solenoid where resistance measures less than 20 ohms.

 

[dyeager535]

Since you are bored, you should compile every single one of the troubleshooting flow charts for the trucks for '87 and say '90 R/V's.

That looks identical to what is in my GM manual.

 

[euzoa]

Since you are bored, you should compile every single one of the troubleshooting flow charts for the trucks for '87 and say '90 R/V's.

That looks identical to what is in my GM manual.

That's because alldata is lazy and scans the pages and uploads them. All hard to read, and cockeyed some times