1999 Porsche 911 Carrera

Dale Diagnostician South Dakota Posted   Latest   Edited  
Resolved
Driveability
Network Communications
1999 Porsche 911 Carrera 3.4L (9602) 5-spd (5HP19HL)
P0300 — Random/Multiple Cylinder Misfire Detected
P0304 — Cylinder 4 Misfire Detected
Misfire, Can Definitely Feel At Idle

Trying to find where to get service information on Porsche vehicles. I made a couple key copies for the owner and when we started the car to charge battery a bit I noticed it had a rough idle. 

The Snap-On Zeus was of no help really other than a “misfire” code of “cylinder misfire” listed. Pulled the IM-608 out, hooked it up and it not only got the p0300 but the p0304. 

Little bit of back story. Owners son bought it online, had shipped from Michigan to South Dakota. He's had it in Summer up in Minnesota as he lives / works up there since he graduated college. 

This car is for sale also. Has 81k miles & previous owner said engine had only 20k miles on since was replaced. No paperwork to validate that as I asked about it unless the son had it and didn't mention to the dad.

#autel for the win on pulling codes.

0
Nate Owner
California
Nate Resolution
 

I'm not sure what you are really asking for. Alldata, Identifix, and the Porsche TIS website all have service information.

+1
Resolution Ð Awarded
Helpful
Resolution
Dale Diagnostician
South Dakota
Dale
 

Nate, That's,,, just the information I needed to know. Between alldata and identifix, never used either. Are either of them more complete than shopkey? I know I can do a reduced rate with Identifix and save money as by first year with shopkey was $30-$40 cheaper then went up after a year. Being a 1 horse show multiple subscriptions can get expensive really quick I'd imagine and if cost isn't…

0
Ð Awarded
Steven Mechanic
Washington
Steven
 

Alldata has info for that vehicle. There is a pretty lengthy page of information for diagnosing P0304.

0
Ð Awarded
Sisco Owner/Technician
Vermont
Sisco
 

Yeah, Alldata is actually pretty good on Porsche, but especially with the age of that one check coils-common to crack/fail.

0
Ð Awarded
Louie Technician
New York
Louie
 

Hi Dale I happen to own one of these and use it as a daily driver. Its most likely a bad ignition coil . I replaced 18 of these the whole 5 years I owned this car​.​they tend to crack easily because of the location of the engine and the lack of ventilation​.​also check the harness and connectors to each coil because they can melt​.​one of my coils shorted out…

+2
Ð Awarded
Helpful
Agree
Rolando Diagnostician
Texas
Rolando
 

Best source for Porsche info is Porsche PPN (TIS is no longer supported). Of course it has its hurdles as well. You have to send your shop info to Porsche for review before they just “hand” you an account. This takes a few hours to a few days. They cherry pick who gets their info. They then send you a link to setup your account and and everything is watermarked, so don't think about sharing you…

+1
Ð Awarded
Helpful
Dale Diagnostician
South Dakota
Dale
 

Rolando, I hear you as I don't share screen prints, etc off websites that I pay for. Its kind of like the DRM issue they had with Napster in the 2000's. Funny to think the Napster case is old enough a generation or two born since don't know about it unless they heard from parents, school, etc. Finding good service information shouldn't be hard for repair shops whether it be fee or free…

0
Ð Awarded