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  #1  
Old 1st July 2006
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Default Lets change the spark plugs!

What do we need?

1 x Torque wrench
1 x Sparkplug socket
1 x Ratchet & extention
1 x Dielectric Grease
4 x Spark plugs
1 x Feeler Gauge (to check spark plug gap)



Which plugs?

All 4 cyl cars can use:

NGK BCPR7ES-11 Saab Part No 9112541 (these are pregapped to 1.1mm)
NGK BCPR6ES-11 Saab Part No 9117565 (these are pregapped to 1.1mm)

Aeros are specified to run platinum plugs

NGK PFR6H-10 Saab Part No 9188681 - But the above plugs work fine and are far cheaper!

What Electrode Gap?

LPT cars 1.1mm spark plug gap - Aero's 1.0mm gap



What tightening torque for the plugs?

2.0 and 2.3 engine 28Nm = 21 lbf ft





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Last edited by Chris 9-5; 9th May 2008 at 05:24 PM.
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  #2  
Old 1st July 2006
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The process:

Make sure the engine is COLD!

Remove the 4 bolts holding the DI in place:



Release the electrical connection at the RH end of the DI, under the throttle pipe:






Lift up and remove the DI, place out of the way UPRIGHT:



Remove spark plugs ( 10mm spark plug socket)





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  #3  
Old 1st July 2006
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Check the correct gap on the new plugs: (1.0mm Aero - 1.1mm LPT's)



Put plugs in and tighten to the required torque (28Nm)



Smear some dielectric grease over the ends of the DI, where they fit over the plugs and replace the DI:





Refit the electrical connection for the DI.

Ensure no tools left in the engine bay.

Job's a goodun



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Last edited by Chris 9-5; 2nd July 2006 at 03:02 PM.
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  #4  
Old 27th July 2006
cfobare79 cfobare79 is offline
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Default 99 9-5 V6

How is this done on the V6 model? I would imagin the same way but need to know for sure before I dive in this weekend.
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  #5  
Old 27th July 2006
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Same idea, same gap and tightening torque, but you have three under each DI cassette and you will need these plugs:

http://www.partsforsaabs.com/product...products_id=80



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Last edited by Chris 9-5; 27th July 2006 at 04:23 PM.
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  #6  
Old 29th July 2006
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Didn't notice you posted this...thanks Chris
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  #7  
Old 15th September 2006
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Hej !

Just read the thread, and must make some comments, se below.

B204E/L/R:BCPR7ES-11, gap:1.00-1.10 mm
B234E/L/R:BCPR7ES-11, gap:1.00-1.10 mm

B205E:BCPR6ES-11, gap: 1.00-1.10 mm
B205E:M/01-> with Saab tuningkit:PFR6H-10, gap:0.90-1.00 mm
B205BioPower:BCPR7ES-11, gap:1.00-1.10 mm

B235E:BCPR6ES-11, gap: 1.00-1.10 mm
B235L:PFR6H-10, gap: 0.90-1.00 mm
B235R:PFR6H-10 or possibly PFR7H-10, gap: 0.90-1.00 mm

B308E:BKR7ES-11, gap 1.00-1.10 mm (Different from 4-cyl)

Note:
1) Since the sparkplug is used as a sensor, the recommended type must be used, otherwise the "sensor reading can not be trusted".

2) Use only NGK plugs.

3) Electrode gap, use the values shown above. There is absolutly no truth in the myth "LPT 1.10 and Aeros 1.00".

4) Gap should be checked with a wire gauge.

5) You need a 16 mm or in inch, 5/8" sparkplug socket.

6) Tightening torque is very important, too loose will cause the plugs to overheat.
4-cyl.28 Nm
V6:27 Nm.
Or, if using NGK (Saab) sparkplugs, first just nip the plug with your fingers, then tighten with 3/4 of a turn.

7) Tighten the DI with 11 Nm.

8) The myth that All 4-cyl can use BCPR6ES-11 or BCPR7ES-11 is not true.

9) Under some circumstances different plugs can be used, we run BCPR5ES-11 on some markets, due to fuel quality and driving behaviour. However, DO NOT
try to be an expert, just simply because you're not ! Stay with the official advice.

10) For highly boosted high reving engines BCPR9ES-11 has been tried,
however, if you need cold hard plugs like this, you may consider your choice of tuner...

11) Also BCR8ES has been tried, once again, it may not be the best choice...
The BCR8ES plug is physically different from the BCPR plugs, the gap is "more hidden" and this is not what a engine expert aims for. The gap should normally be deep into the air/fuel mixture.

12) Do NOT use iridium plugs.

Last edited by DrBoost; 28th September 2006 at 08:36 AM.
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  #8  
Old 15th September 2006
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Quote:
Originally Posted by DrBoost
8) The myth that All 4-cyl can use BCPR6ES-11 or BCPR7ES-11 is not true.
Could you explain why this is? I've been using 7ES plugs in my aero for about a year now and they seem to run great.

Also do you recommend 6 or 7 for a standard aero? What about a lightly modded?

Last edited by Raven18940; 15th September 2006 at 10:39 AM.
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  #9  
Old 15th September 2006
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Hej !

The answer to your question can be found in Note #1 above.
Plus, fine electrodes will give you a better ignition of the air/fuel mixture, less ignition delay and less misfire. Longer spark plug life may not be that important for you ?

We've got an Aero at home, it's a M/2001 with M/02 s/w (250 bhp) , I'm using PFR6H-10 gap 1.00 mm. Driving habits from mild to wild. The plugs I'm using should work well up to at least 300 bhp IF the concept is in harmony.
(my wife is the owner of the Aero)
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  #10  
Old 15th September 2006
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Quote:
Originally Posted by DrBoost
Hej !

The answer to your question can be found in Note #1 above.
Plus, fine electrodes will give you a better ignition of the air/fuel mixture, less ignition delay and less misfire. Longer spark plug life may not be that important for you ?

We've got an Aero at home, it's a M/2001 with M/02 s/w (250 bhp) , I'm using PFR6H-10 gap 1.00 mm. Driving habits from mild to wild. The plugs I'm using should work well up to at least 300 bhp IF the concept is in harmony.
(my wife is the owner of the Aero)
Well I guess I'll be changing out to the platinum 6's next oil change (1000 miles away). I can't believe a little thing like that makes a difference, I could have sworn the car felt like it was running better. In my defense I did gap them below 1.0mm.
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  #11  
Old 15th September 2006
Z28Hokie Z28Hokie is offline
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Dr. Boost = Very Helpful
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  #12  
Old 16th September 2006
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Hej !

Well, sometimes I try to do my best....
To me, happy Saab owners are my reward.

BTW; Changing sparkplugs on the engine shown in the avatar, will require a set of 24 plugs + some weired tools...
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Old 28th September 2006
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From Br Boost

Quote:
We've got an Aero at home, it's a M/2001 with M/02 s/w (250 bhp) , I'm using PFR6H-10 gap 1.00 mm. Driving habits from mild to wild. The plugs I'm using should work well up to at least 300 bhp IF the concept is in harmony.
(my wife is the owner of the Aero) End Quote.


How did you get the MY02 software? Do the dealers have access the the software? Final question - would the 02 software work on my 2000 9-5 Aero and would I get a noticeable power increase?

Thanks Dr. Boost.

Last edited by Aeronaut; 28th September 2006 at 11:51 PM.
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Old 29th September 2006
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Hej !

Dealers can only update the s/w with the same type of s/w, or in plain english, if the vehicle is a M/2000 Aero, they can not reprogram to a Aero M/2002 s/w.
Then, how I got the s/w, well because of what I do during daytime...

The option that you have, is to find a M/2002 Aero ECM and fit it to your car.
I would say that the M02 vs. M/00 is milder at low rpm and slightly more at higher rpm's. A Aero M/00 will deliver approx. 240 bhp under overboost, while the M/02 around 250 bhp at overboost, so the difference is not as great as it may look if you study the figures 230 bhp vs. 250 bhp. I must add, the difference between M/02-05 vs. M/06 is greater.
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  #15  
Old 30th September 2006
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What plug should i be running on a 2.0 lpt, tuned to stage 4? BCPR6ES or PFR6H ?
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  #16  
Old 3rd October 2006
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Hej !

Sorry for the late reply, I've been thinking you see....
Not that it helped much.

I can not tell you which plug to use, since I have no background data of you car. Even with that, it's hard to give a correct answer. But, I would guess that a either BCPR6ES-11 or PFR6H-10 would work if everything is in harmony.
Unfortunatly, that's not always tha case, it seldom is, so it's more likely that one step colder plug is required. So sould you use a BCPR or a PFR plug ?
It simply depends on the tuner, is it designed for BCPR or PFR.
To make the choice even more interesting, I don't think they know how to adapt for the different styles of plugs.

Sadly, I've got no clear answer for you.
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  #17  
Old 4th October 2006
Gazolzwurf Gazolzwurf is offline
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What plugs does Hirsch use with their stages?
Didn't they worked alongside Saab during the development stages?
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  #18  
Old 4th October 2006
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Quote:
Originally Posted by Gazolzwurf
What plugs does Hirsch use with their stages?
Didn't they worked alongside Saab during the development stages?
As far as I'm aware the plugs arn't changed from stock.........well not for the 280hp Aero kit anyway.
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  #19  
Old 4th October 2006
aikman7981 aikman7981 is offline
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Two questions... I just performed this on my Aero. The gap tool I used only went up to .88 mm so I left a little extra room, should I be concerned if all the gaps aren't precise? They are all close, certainly. Also, when you say "nip" the plugs with your fingers you mean put them on hand tight plus 3/4 turn? I hope so b/c thats what I did. I turned the ratchet until resistance and then another 3/4. Upon restarting vehicle after the job I got the TCS off light. I turned off and started again with no lights. Am I good to go? That was more like 3 questions
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  #20  
Old 11th October 2006
Gazolzwurf Gazolzwurf is offline
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Not so sure on the gapping technique but the rest sounds ok.
Get a new feeler guage, they're not much to buy.
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