Is this a ICS or CDI problem, and can you help?.

flatsixcrazy · 07-09-2004, 10:34 AM

Hi all,
I have finally gotten the "project" up and coming alive two weeks ago. New plugs, cap, and rotor, belt, air filter, valve adjusted and new used HEs. The 78SC cold starts and idles great, but quickly dies when I press on the accelerator pedal. Actually, this is how it happens everytime. It idles and I press on the gas pedal, it would initially hesitate when I put my foot on the pedal to give it some gas, it would gives me a couples of pops in the air box, revs up to 4-5 Krpm, and dies when it came back down to idling rpm when I take my foot off. After that, it would not restart until a few hours later and I smell a lot of gas. I have check the sparks at the plugs when it would not restart and the sparks looks fine. Has anyone have this problem before and can you help. Thanks in advance. Andy

Paulporsche · 07-09-2004, 01:00 PM

Sounds like a lot of the usual CIS stuff. Check the cold control pressure, vacuum leaks, mixture, plug wires, etc. Sounds like you are too lean. Also check to see that the distributor rotor turns easily and springs back.

Is the airbox popping the popoff valve?

How old is the gas and fuel filter?

Hane you checked the injector spray pattern?

Have you checked to see if the popoff valve is reseating itself correctly?
Let us know if any of ths works.

Paul

Paulporsche · 07-09-2004, 02:11 PM

Nzaldivar has a problem that sounds similar to yours. He has found that at least 3 of his new plug wires were loose inside the connectors, although I have not yet heard if fixing them has solved the problem. You might want to follow his thread.

Paul

flatsixcrazy · 07-12-2004, 11:04 AM

Hi PAul,
Thanks for the tips. Looks like I have to systematically check the problems. The pop sounds was coming from the air box and I think it's coming from the pop-off valve. The car seems to cold start fine but it just would not idle after I rev it up, when the engine is hot or cold. A few weeks ago, after the major service, it was running fine and I can rev it up all I want. This problems happens overnight Andy

Paulporsche · 07-12-2004, 11:58 AM

Andy,

Do a search on the O2 (oxygen) sensor.
Check your control pressures, thermotime switch and cold start injector.
Make sure your distributor is tightened down.
Check those things I mentioned in previous post.

I always check the cheap, easy things, like wires, connections, fuses, vacuum lines, etc first.

Try richening the mixture a little, about 1/8 turn. Then turn your idle speed back up. See if that helps. It could be your WUR.

How old is your fuel and fuel filter?

Let us know if anything works.

Paulporsche · 07-12-2004, 12:41 PM

Andy,

Check the 83sc cold start thread. That poster's car would start, idle and then die. He apparently had a bad connection to the thermotime switch. Something else to try.

Paulporsche · 07-12-2004, 02:58 PM

In that 83 cold start thread, DDD now thinks it might have been his popoff valve not seating correctly.

flatsixcrazy · 07-13-2004, 08:58 AM

Paul,
I'll check the pop-off valve and it's fine. However, I did check the fuel pump and here is what I found. With the standart relay (red)in the trunk, I can not hear the fuel pump coming on when I turn the ignition on (but not cranking). I then pulled the relay out and swap the other relays (black)in the trunk funse panel in, still no fuel pump. Then jumped the terminal 30 and 87a on the relay socket and then the feul pump kicks on when I turn on the ignition. Does this mean my feul pump is O.K and the relay is at fault?. BTW, when I swap the red relay with the black relay, the feul pump did not kick in but the car starts anyway. I let it idles for a few minutes and revved it up to 2-3KRPM and let it come down. The car still idles like normal. I though that'll fixed it, but then I tried again a few minutes later, the car hesitates and then dies. Thanks. Andy

P.S: I'll double check the pop-off valve again tonight.