993Godspeed

My car is idle ling rough and misfiring, time to change a few things:

planning on changing:

Distributor Cap
Spark plugs - F5DP0R Bosch
Iginition Wires
Fan Belt

What else should I change while at it? Engine Temp Sensor, oil temp sensor?

Lastly where do you guys buy it from? Pelican? Dealer? I have a shop discount. Thanks for your input.

Quadcammer

Agree with your choices, although you may want to consider the slightly colder FR6LDC plug.

You should also change the ignition rotor.

Cylinder head temp sensor has been known to cause some issues.

Fan belt and ignition wires, sonnenoemporscheparts.com (the pelican wires won't fit without modification)

For the plugs, dizzy cap/rotor: amazon, especially if you have amazon prime. Best prices, and you know you are getting authentic parts.

993Godspeed

Thanks, yes will definitely consider your plugs and the cylinder head temp sensor.

Are the prices very different from Dealer ?

Quadcammer

yes.

For instance, bosch dizzy cap in bosch box at amazon...$53 free shipping, no tax.
Dizzy cap at dealer, $153...$99 at online parts sources.

btw, my bad, its sonnenporscheoemparts.com

993Godspeed

Great man. Saved me a bundle!

Quadcammer

no problem. The dizzy cap and rotor are a piece of cake. Ignition wires suck if prior replacement was not done with an eye for future service. Plugs aren't bad except for number 6 by the ps pump.

Belts are finnicky but not too bad. Haven't done CHT.

993Godspeed

Thanks, you mind telling me about the rotors? Cant seem to find the one on Amazon. sorry.

Quadcammer

http://www.amazon.com/Bosch-04216-Ig.../dp/B000BZHXQS

or

http://www.autohausaz.com/search/pro...ibutor%20Rotor


az autohaus is another good choice for parts.

993Godspeed

Beautiful!
man I cant believe this is so cheap!

LexVan

Godspeed, how's your MAF sensor? Not cheap, if it needs replacement, too. Just a thought.

Steve Weiner-Rennsport Systems

You might wish to review that recommendation,......

Bosch heat ranges are hotter as numbers go up. A 6 is hotter than a 5.

NGK heat ranges are the opposite; as the numbers go up, the plugs get colder.

JMHO, but I would not use a Bosch 6 plug in any Turbo.

Quadcammer

no kidding. well, color me a moron then.

Did I mean an FR5LDC?

Quadcammer

Steve, have you changed your mind about this recently?

In these threads, you didn't mention a problem with the 6 plug, and it was recommended by Kevin at UMW.

https://rennlist.com/forums/993-turb...-question.html
https://rennlist.com/forums/993-turb...gs-to-run.html

fwiw, i run the FR6 and the plugs have looked fine when I've checked them. Nothing to indicate that they were too hot a plug.

993Godspeed

Thanks! How do I know if it's acting up? I don't want to change it if Don't need. I will start with all the above. If problem still persist I will change MAF. Thanks.

Mike J

You would not start replacing sensors, etc. just yet. I would do a basic tune-up first, and then if you still have issues, continue on with diagnostics.

For instance, I would do the plugs/rotor/cap/belts/filter's first. The drive it. Replacing spark plug wires is not a scheduled maintenance item (on the Porsche literature) and i only replace them when needed. The turbo wires last longer than the NA cars, they are on the upper (cooler) side of the engine. None of the wires run weird tight corners near exhaust systems.

Be careful with the belts, use Porsche brand belts - there have been issues of misfire codes being caused by other manufacturers belts. Also, is your car picking up any misfire or other codes? Code may exist without the CEL light being lit, you may want to check.

How many miles on your engine? Other maintenance items is to clean the ISV (they seem to run a bit cleaner on Turbo's though), and if your mileage is high enough, you may want to consider cleaning the injectors. You need to pull them and send them out to be cleaned. On the cars I have done this with, its rare to have all six perfectly flowing, and I have found cases of partial plugs causing spray issues on 3 out of 6.

Cheers,

Mike