As in my post above ^^^^
As in my post above ^^^^
RIP Rob van de Veer Top bloke
I say Sir, I must be mad, one loves fixing K-Jet !
Make sure there's plenty in the tank for the weekend chaps....
Posts: 605
wow, and you love fixing K-Jet ?
no carbs ?
no EFI ?
instead reading manuals and fixing classic cars ?
you are unusual :-D
Where ist the Facbeook- I like - button ? :-P
My friends tell me I'm 'special', but I'm taking that as a plus point
I fix carbs and diagnose efi on modern cars too as a hobby, but I like k jet, especially in the D. I've fixed a few other Deloreans in my time since I've had my own since 2003.
Btw, I'm not on Facebook or social media either (other than my friends/ other owners on "wattsapp"), that must make me double unusual
RIP Rob van de Veer Top bloke
I say Sir, I must be mad, one loves fixing K-Jet !
Make sure there's plenty in the tank for the weekend chaps....
Location: Rochester, NY
Posts: 2,405
My VIN: 01049
-Mike
My engine twists my frame.
1981 DeLorean, Carb LS4 swap completed
1999 Corvette, cam/headers/intake manifold, 400 rwhp
2005 Elise, stock
2016 Chevy Cruze
RIP Rob van de Veer Top bloke
I say Sir, I must be mad, one loves fixing K-Jet !
Make sure there's plenty in the tank for the weekend chaps....
Posts: 184
Alright, had a big work project for a while, but that's wrapped and now I can focus on the important things in life like idle issues on a 35yr old car!
Upon further diagnosis, I have some new insights:
1-one hose clamp on the far side of the idle speed motor was loose; I tightened and reseated all the hose clamps, and as best I can tell, they are all seated thoroughly. This brought the high idle down from ~2400 to ~1700, so it helped, but didn't solve the problem.
2-I've found that if I pull the black 3 pin electrical harness to the top of the idle speed motor while the car is running, the idle drops down to exactly where I want it, ~800. If I reseat it, it jumps to ~1700, consistently.
I haven't found an elegant way to unseat the 3 pin harness, and jumper +12V and ground to the idle motor pins, but that's my next diagnostic test. Any further ideas on the reseating/unseating motor harness test would be great-thanks!
Posts: 605
what mor details do you need ?
I described it weeks ago.
It's a few second test and then you know if it's mechanical or electrical.
Posts: 184
yes, thanks for that test. If I'm understanding correctly, I pull the 3 pin black electrical connector to the idle speed motor, bridge the middle pin(+12V), and then tap either of the left or right pins to ground. My alligator clip method is a bit janky, but I was able to do this and at least bridge the left pin to ground. It goosed the idle speed up to about 1500-ish for about 1-2 seconds, then it fell back to the ~500-ish range that it idles at with the motor disconnected. I will try to test the right pin tapped to ground, and see what it does.
Yes, I ran thru the checklist there. Everything seems to be in order, as best I can tell, save for these two items:
-thermister: i can't find it. (sorry, as you can see, I'm green on the DMC-12.) I've got the diagram out, and I'll stare at it further, and find it next.
-the copper pipe that connects to the FAR end of the idle speed motor; this looks to connect underneath near the distributor; I can't find that connection to check the hose clamp's security. the end that connects to the hose out of the far side of the idle speed motor was loose; it feels like it may have some play, so possibly the other end of that copper pipe needs a hose clamp secured?
thanks for the help!
Location: Syracuse, NY area
Posts: 1,027
My VIN: 10287
Club(s): (DMA)
The thermistor is screwed into the coolant distribution pipe (the Y-pipe) underneath the intake manifold in the VOD (valley of death). Not easy to see with the intake in place.
The copper pipe that runs from the idle speed motor to the fuel mix unit (aka Pipe of Agony) needs to be seated securely or it can cause idle issues. Remove the air filter housing and push open the air deflector plate and shine a flashlight in there and verify if the end of the copper tube is securely in there.
Nick A.
1988 BMW 325is
1982 DeLorean DMC-12
1989 Jaguar XJ6