82SC Sputters and Stalls when Warm - Description & Video

[reesestewww]

82SC - US Car - Bosch CDI

Starts and runs fine, slightly high idle but not terrible. After about 30 minutes on the road the car started to sputter and serge slightly at speed. Getting to first stop sign after I noticed these symptoms the car stalled and backfired. I let it rest for about 5 minutes on the side of the road, then it fired right back up and I was able to get it home. This has happened my last 3 outings.

Once in the garage I let it idle until and it sounded fine until suddenly it started sputtering again. Then, it stalled and backfired a second time. While it was in the garage I notices a rich exhaust smell as it stared to sputter. The idle and sputtering got worse until it died and backfired. I happened to get it all on video too, of course you can't smell it

After doing some research here, I found another users that seem to have the exact same symptoms and it was a failed CDI. I have not done any trouble shooting as of yet, however the more I read the more I'm lead to believe it's the CDI.

I'm working on putting a parts list together for an MSD Ignition, coil, plugs, plug wires, ect. But before I order any of these items, which I'm sure couldn't hurt, I wanted to float this thread for any additional input.

Thanks!

Apologies for the incorrect orientation.
Video of sputtering, stall and backfire

[wacko]

Not sure but you could check your injectors. I had one that was partially plugged that was causing it to Misfire on that cylinder. It is easy enough to check, just pull out the injectors and put them into clear bottles then lift the sensor plate in the air box with the car NOT running but ignition turned on. Observe the spray patterns and more specifically that they all start spraying at approximately the same point. Mine ran ok at higher rpm but as the rpm dropped the hesitation increased and even backfired occasionally. The clogged injector required more fuel pressure to open.

[reesestewww]

Originally Posted by wacko

Not sure but you could check your injectors. I had one that was partially plugged that was causing it to Misfire on that cylinder. It is easy enough to check, just pull out the injectors and put them into clear bottles then lift the sensor plate in the air box with the car NOT running but ignition turned on. Observe the spray patterns and more specifically that they all start spraying at approximately the same point. Mine ran ok at higher rpm but as the rpm dropped the hesitation increased and even backfired occasionally. The clogged injector required more fuel pressure to open.

wacko thank you for the input, a few questions:

-Would an injector cause an interment issue?
-Do you check all injectors at the same time? Per your description I assume yes.
-This is the sensor plate you're referring to?

[Bob Kontak]

Fuel restriction.

You can confirm with pressure gauges.

If you want to dive right in pull the big plug on the bottom of the fuel tank and check the screen. Screen can clog and when you let it rest the cooties fall off the screen allowing you to restart.

Nice to not have much gas in there as it all comes out.

Without a pressure test, you are just guessing.

Alternatively, fuel pump power may die from a tired red relay. Wiggle that in and out a few times to shake up the connection a bit. When mine would come loose, there was no restart until I pushed it back in.

One mo' test. Wait for it to die and then do a secondary spark test. That will eliminate a fuel restriction.

[wacko]

Mine was consistent at lower rpms.

Yes you should check all injectors at the same time otherwise you will be spraying fuel into the cylinders and if you spray too much in there you can create a hydro lock situation.

Yes that is the sensor plate.