Buy a code reader to find out what the code is for.

Kinda sounds like your AFR leaned out. went boom.

 

JSP has been known to have lean running tunes. Lean and T7 is not a good mix.

Have you cleaned or replaced your MAF lately?

Edit -

Could this be a throttle body issue?

 

compression check.

 

That to check possible damage.

I will back checking the MAF as you have tried a different DIC.

 

We need that code.

 

we need that code.

4 8 15 16 23 42

 

Codes and compression check. Sounds like something melted.

 

Is your spare DI bad too? I would double check that against another one. 2 foulded & two clean plugs & no engine noise still sounds like a Bum DI.

 

Thanks for all the responses. The MAF is about a year old, and has only maybe 2k miles through it. The DI on the car is about the same age, and the other one was working fine when I replaced it as a precaution. I don't have a OBD scan tool, but I'll try to borrow one and get the codes.
I agree - compression check makes sense. I'm worried about valve train, since the pistons are still intact. That is yet another tool I don't have - I can get mey hands on one, though.

 

If you want to rule anything out mechanically, compression test.

 

Code can be read for free if you are close to an AutoZone/Advance Auto and want to try to limp it there.

 

Just prepare to have them tell you that replacing your o2 sensor will solve EVERYTHING!

 

also check the pipe that goes to your throttle body. it may have cracked or came loose.

 

The flashing CEL is caused by your misfire. When its flashing like that its indicating that your car is missing enough to cause catalytic converter failure so I wouldnt worry about whats causing the flash, but whatever else it may have stored could tell you a little about whats up. Do you have any way to test your injectors?

 

a hose popping off, bad DI, clogged cat, and bad plugs will cause the CEL to flash. when you start your car is there a really bad smell?

 

I actually HAVE replaced the front O2 sensor! The only smell from the car is that really rich odor - like an old carbureted muscle car. The cat is a 3" Magnaflow race cat - only about a year old.

Will check for a leaking cylinder tonight - my greatest fear is a burnt piston! Oh well...it's only money. Good excuse to put a forged set in anyhow...

 

crank position sensor?

 

no, that's only a starting problem

 

Thanks for all the input guys. It looks like I'm going to be replacing pistons after all.

Anybody familiar with a Saab garage in the Greenville or Spartanburg, SC area? I'm not doing this one myself. As Strother Martin said in Cool Hand Luke - "a man's got to know his limitations..."

 

Well, I picked up a compression tester and confirmed where the issues is - no. 1 cylinder has zero compression. Hope that the cylinder walls aren't scored - I'd love to just have a new set of forged pistons stuffed in and get back on the road!

So, no one can offer any suggestions on who in SC might be able to help with this? I guess I'd be able to drag the Viggen into NC or GA if there's no other choice...

 

Well, tore the engine down, and got a surprise. NO holes in the pistons...but there was a stuck valve in #1 cylinder, and of course it collided with the piston. Going to rebuild the entire thing anyhow - forged pistons, T5 cams, new timing set, bearings, etc., but this wasn't at all what I expected. No excessive rpms (as in missed shifts), just running it hard.