Flashing Check Engine Light

[skymast]

I left my house this afternoon, stoppped at the mail box, left the car idling for about 5 minutes, then drove about 1/2 mile when my car (1999 996 C4) started sputtering. Immediately, the check engine light started flashing and soon thereafter, stayed on full time. I immediately slowed down and lumbered back home, careful to keep the car at low speed, etc.

When I got home, I turned off the car, then restarted it, the check engine light was gone. I drove the car about an hour later .... no problems / back to normal.

I did change my plugs recently .... but havent had any issue up to this point.

Any thoughts / insight?

Thanks!

[1999Porsche911]

Double check that all cables are secured properly to the CORRECT coil packs for the plugs.

[skymast]

Double check that all cables are secured properly to the CORRECT coil packs for the plugs.

That is the one problem I know it is not ....

[skymast]

OK, I just had my car connected to the OBD-II. The codes are P0304 (misfire on cyl 4) and P0302 (Misfire on Cyl 2). Give that I just changed my plugs in the last 7 days, is it possible that 2 plugs went out of should I look elsewhere for the problem. Also, is there any possible correlation between #2 and #4? Thx!

Edited March 26, 2006 by skymast

[Izzy]

It really might be worth it to re-install the coils and the connectors to the coils. Something may be loose and not making full contact.

[cmanders]

Sounds like intermittantly faulty coil packs to me. Check the coils on those two cylinders for any hairline cracks.

[Loren]

I agree it is most likely a connector(s) not fully sealted or cracked coil packs.

[skymast]

OK... Luckily it was a 'amateur hour' problem. Unfortunately the OBD doesn't have this fault code!!! #2 was fine (not sure why I got a misfire read out) but I must not have connected it 'until it clicked' on #4. Thx for the insight. M