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I have checked a few things that were suggested. I did get a compression check done. #1-150psi, #2-150 psi, #3-153psi, 4-149psi, #5-152 psi, #6-152psi. All fairly close. While cruising with foot off, TPS .42, IAC 51-67. Will idle along at 40km/hr? Valve cover is still stock and plumbed into...

I will check the TPS and IAC while driving as I have not. I will also try and get to a compression check as well. It will have to wait a few days. I have a feeling I may have a bit of vacuum leaking thru the front and rear seals. No leak in front really, but a small drip at the rear seal...

The engine is stock with 150,000 km. I just installed a turbotweak classic v5.7 chip. I rechecked the O2 on scanmaster and it cycles while driving, but idling or at a light it will not change. I was looking into the low vacuum as it idles fairly well after warmed up, but driving down the street...

I have low vacuum pressure, it is reading about 15in hg and I am getting terrible mileage. I replaced all the vacuum lines. I have a scanmaster and the readings are Knock 726 ret. 0.0 Maf 5.0 LV8 38 Volts 13.4 Int 128 BLM 127 Speed 0 Coolant 178 Air 119 Rpm 725 TPS .42 IAC 16...

I just got my scanmaster. The scanmaster is showing the coolant temp properly. I assume then that the ECM is getting the data , but the fan will not run. I ran a ground wire from the dark green wire on the low speed relay to a switch and the fan will run manually. I feel that all is working...

Yes, it is a stock chip. I did check the coolant temp sender with my ohm meter at a couple temps and the resistance was increasing as my engine cooled down so appeared to be operating correctly, but that doesn't mean the data is getting to the ECM. I will get a scanmaster. What is difference...

Checked pin D2 on ECM, grounded pin and fan started.

Thanks for the reply. I do not have a scanmaster, I have been looking into it. I was leaning to the Scanmaster G to get the downloading capability?? I will check the dark green wire at D2. I guess this is the wire I cut into at the relay and will eliminate a broken wire being the issue. Not...

Thanks for the attachment pacecarta. I have this checklist and think I have done most of the checks. My car is all stock with no mods. I did get under the car and checked the ground lines and they were secure. Both constant 12v and keyed 12v are present at the relays. As per the checklist ...

Update. I have ran an aux ground wire on my 87 GN cooling fan to see if that would help but did not. I took the green wire on the low speed fan and cut into it to ground out that line. With key on the fan would come on. Does this mean the relay is good and it is not getting signal from ECM? I...

My cooling fan will not run. I have looked at the troubleshooting guide on Vortex . Rlys 5 amp fuse is good. I have 12v always on large red wires at the the relays , and I have 12v on brown wire with key on. I have pulled the connector at the a/c, and fan works when A is grounded. I jumpered...

How I do I find out if my chip has the lock up turned off? It is original and used to work. Can it somehow be switched off on its own?

Located in Alberta. Got tranny back and installed, still won't lock up. Taking it back in a week for them to look into. Will find out what was done, only says rebuild torque convertor on work order.

I am afraid it is too late. The tranny was pulled yesterday. It is not being rebuilt where I live. It is being sent away to the city. And to answer your question, yes it shifted very solid. The only issue was no lock up. This is the first time the tranny has been looked at as I am the original...

I dont have any place to try and pull the pan off so I took it to a tranny shop to replace the solenoid. They called me, apparently the magnet was looking like a porcupine and was full of torque convertor debris, so it is going in for a complete rebuild.

Hensleyt, Thanks for the reply. I have tried all of the points listed above. I have tried the switch to manually force the solenoid to lock up tranny and it doesn't, so I guess the last thing to do is check the solenoid. I will update later. Thanks again.

I am a new member, but I am an original owner of an 87 GN. All original- no mods. The tranny is not locking up. I have been trying to troubleshoot it myself with help of reading form posts. I have measured voltage at tranny and at ALDL and both are good. Brake pedal will drop 12v when pressed. I...

I am a new member, but have found this test on line to help with checking cruise issues. Hope it helps. I am still having issues of my own yet.