ignition advance relay

Stonewall13 · #1 (**permalink**) 09-28-2007, 08:03 AM

I have a 78 spider with spica and cannot get the sob to idle at all. I looked at the wiring diagrams and see that there is a ignition relay that is connected to the de-cel sol and micro switch. That relay and wiring is missing. Car will run alright but as soon as I take my foot off the gas the car will die. Any suggestions. Would the de-cel not being hooked create the lack of idle? Any suggestions will be appreciated!!

Alfacliff · #2 (**permalink**) 09-28-2007, 08:27 AM

the decel switch was to cut the fuel when slowing down to reduce emmissions and popping when slowing down. the switch would turnoff when the engine slowed down. is the spica set up properly to idle?
cliff

Stonewall13 · #3 (**permalink**) 09-28-2007, 02:41 PM

I think I have the spica set up to idle. I have the gap set at 19, I have the throttle plates closed all the way. Other than that I don't know what else to do. Any suggestions on what else I can check? I also have checked the points gap. I am at a loss for what else to check.

missinglink · #4 (**permalink**) 09-29-2007, 01:23 AM

I don't know enough to answer your question regarding the relay and missing wiring. You might try adjusting the air equalizer counterclockwise to allow more air since the throttles are closed. Check the idle air hoses for disconnects, obstructions or damage, and check the hose to the oil/vapor separator. It seems on my car, idle problems are usually ignition, plugs and timing related first and spica second.

**papajam** · #5 (**permalink**) 09-29-2007, 05:04 AM

Quote:

Originally Posted by Stonewall13

I looked at the wiring diagrams and see that there is a ignition relay that is connected to the de-cel sol and micro switch.

Alfajay · #6 (**permalink**) 09-29-2007, 01:58 PM

I am NOT a Spica expert (and don't aspire to be), so others may clarify or even contradict what I have written here. But, Stonewall13 said he didn't know what else to adjust, so...

The decel solenoid itself can be adjusted (and adjusted quite a bit). Too far in one direction (out?) and the car will backfire on deceleration, too far the other way (in?) and it will .... Well, it will do something - perhaps prevent the engine from idling.

That dual point + relay setup was a typical mid-70's kluge that auto manufacturers had to employ to try to meet emission requirements. I doubt it accomplished much - you can probably remove it and still meet smog. Further, I doubt it is related to your idling problems.

**Roadtrip** · #7 (**permalink**) 09-29-2007, 02:41 PM

First of all, the ignition system must be timed correctly. If you can't get it to idle to set the timing with a strobe, set it static with a test light.

Once the timing is right, you should go through the entire Spica setup process, soup to nuts. If you need the Spica manuals, let me know.